feat(agents): reference chips, quote blocks and a richer completion in the composer (#3091)

The agent composer is now a CodeMirror editor: the text stays plain and is what's sent, while @ file references are drawn as chips (icon, name, lines) that move and delete as one piece, open on click and preview on hover; Backspace after a chip opens it as text. Quotes show as blocks, and sent messages get the same chips and quote blocks. The @ completion lists open editors first, highlights matches and shows the folder; the focused editor's file is offered above the text, a pasted project path becomes a reference, and dropping files shows a hint. Lines copied from an editor paste as a reference, terminal output as a terminal block, and code blocks show as cards. The reference trimming regex avoids lookbehind for WebKit before 16.4.

.github/workflows/release-build.yml

@@ -78,7 +78,7 @@ jobs:
       - uses: dtolnay/rust-toolchain@stable
         with: { targets: "${{ matrix.target }}" }
       - uses: Swatinem/rust-cache@v2
-        with: { key: "${{ matrix.target }}" }
+        with: { key: "${{ matrix.target }}", cache-on-failure: true }
       - name: Linux deps
         if: runner.os == 'Linux'
         run: |
@@ -181,7 +181,7 @@ jobs:
       - uses: dtolnay/rust-toolchain@stable
         with: { targets: "${{ matrix.target }}" }
       - uses: Swatinem/rust-cache@v2
-        with: { key: "server-${{ matrix.target }}" }
+        with: { key: "server-${{ matrix.target }}", cache-on-failure: true }
       - name: musl toolchain
         if: runner.os == 'Linux'
         run: sudo apt-get update && sudo apt-get install -y musl-tools

Cargo.lock

@@ -4288,6 +4288,7 @@ dependencies = [
  "tokio",
  "tracing",
  "tracing-subscriber",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]

README.md

@@ -9,6 +9,10 @@
   The IDE you know, rebuilt in Rust.
 </p>
 
+<p align="center">
+  English · <a href="README.zh-CN.md">简体中文</a>
+</p>
+
 <p align="center">
   <a href="https://github.com/l0ng-ai/openidea/releases/latest"><b>Download</b></a>
   &nbsp;·&nbsp;
@@ -19,8 +23,6 @@
   <a href="#plugins">Plugins</a>
   &nbsp;·&nbsp;
   <a href="#community">Community</a>
-  &nbsp;·&nbsp;
-  <a href="#sponsor">Sponsor</a>
 </p>
 
 https://github.com/user-attachments/assets/234dd54c-1255-4b3a-b35c-533d78d737c0
@@ -70,17 +72,6 @@ the [official plugins](plugins/official). The plugin API is still a preview.
 
 - Contributing: see [CONTRIBUTING.md](CONTRIBUTING.md) and the [contributor docs](https://openidea.sh/en/contribute/setup).
 
-## Sponsor
-
-If OpenIDEA saves you time, you can support its development with Alipay or WeChat Pay.
-
-<table>
-  <tr>
-    <td align="center"><img src=".github/assets/sponsor-alipay.png" alt="Alipay QR code" width="200"><br>Alipay</td>
-    <td align="center"><img src=".github/assets/sponsor-wechat.png" alt="WeChat Pay QR code" width="200"><br>WeChat Pay</td>
-  </tr>
-</table>
-
 ## License
 
 [Apache 2.0](LICENSE). Bundled third-party assets are listed in [`THIRD_PARTY_LICENSES.md`](THIRD_PARTY_LICENSES.md).

README.zh-CN.md

@@ -0,0 +1,88 @@
+<p align="center">
+  <picture>
+    <source media="(prefers-color-scheme: dark)" srcset="src-tauri/icons/source/openidea-wordmark-dark.svg">
+    <img src="src-tauri/icons/source/openidea-wordmark.svg" alt="OpenIDEA" height="56">
+  </picture>
+</p>
+
+<p align="center">
+  你熟悉的 IDE，用 Rust 重新打造。
+</p>
+
+<p align="center">
+  <a href="README.md">English</a> · 简体中文
+</p>
+
+<p align="center">
+  <a href="https://github.com/l0ng-ai/openidea/releases/latest"><b>下载</b></a>
+  &nbsp;·&nbsp;
+  <a href="https://openidea.sh/zh">文档</a>
+  &nbsp;·&nbsp;
+  <a href="#性能对比">性能对比</a>
+  &nbsp;·&nbsp;
+  <a href="#插件">插件</a>
+  &nbsp;·&nbsp;
+  <a href="#社区">社区</a>
+  &nbsp;·&nbsp;
+  <a href="#赞助">赞助</a>
+</p>
+
+https://github.com/user-attachments/assets/234dd54c-1255-4b3a-b35c-533d78d737c0
+
+OpenIDEA 把 IntelliJ IDEA 的使用方式（快捷键、工具窗口、随处搜索的习惯）带到一个以 Rust
+为核心的原生桌面应用里。
+
+编辑器、代码洞察、调试器、Git、终端、数据库客户端和 HTTP 客户端，支持 60 多种语言。
+提供 macOS、Windows 和 Linux 版本。
+
+## 性能对比
+
+在缓存已预热的情况下打开 [freqtrade](https://github.com/freqtrade/freqtrade)（Python，约 770 个文件），
+取 5 次运行的中位数：
+
+|                       | OpenIDEA       | IntelliJ IDEA 2026.2.3 |
+| --------------------- | -------------- | ---------------------- |
+| 显示项目窗口          | **0.9 s**      | 3.1 s                  |
+| 就绪（CPU 平稳）      | **1.1 s**      | 13.2 s                 |
+| 内存（USS，所有进程） | **169 MB**     | 2011 MB                |
+| 就绪前消耗的 CPU 时间 | **2.4 s**      | 47.9 s                 |
+| 空闲 CPU              | 单核的 **4 %** | 单核的 7 %             |
+| 退出                  | **0.3 s**      | 5.9 s                  |
+
+测试使用 `main` 分支的 OpenIDEA release 构建，以及默认设置和插件的 IDEA，环境为 Windows 11、
+32 核 AMD、62 GB 内存。IDEA 对 Python 的分析更深入，所以两边的“就绪”并不代表完成了同样多的工作。
+两者都以相同方式从外部测量：可以用 [`perf/compare`](perf/compare) 在自己的机器和项目上复现。
+
+## 插件
+
+插件可以添加操作、补全、快速修复、工具窗口、自定义编辑器、主题、文件图标和语言。插件以沙箱化的
+WebAssembly 组件运行；主题、图标主题和语言无需编写代码。
+
+在“设置 › 插件”中安装，或用 `openidea-plugin new` 创建自己的插件：参见
+[编写 OpenIDEA 插件](https://openidea.sh/zh/plugins)和[官方插件](plugins/official)。插件 API 目前仍是预览版。
+
+## 社区
+
+- [Discord](https://discord.gg/2Zy4yn7gP)：提问、反馈和版本发布消息。
+- 微信群，扫码加入：
+
+  <img src=".github/assets/wechat-group.png" alt="微信群二维码" width="200">
+
+- 参与贡献：参见 [CONTRIBUTING.md](CONTRIBUTING.md) 和[贡献者文档](https://openidea.sh/zh/contribute/setup)。
+
+## 赞助
+
+如果 OpenIDEA 帮你节省了时间，可以通过支付宝或微信支付支持它的开发。
+
+<table>
+  <tr>
+    <td align="center"><img src=".github/assets/sponsor-alipay.png" alt="支付宝收款码" width="200"><br>支付宝</td>
+    <td align="center"><img src=".github/assets/sponsor-wechat.png" alt="微信支付收款码" width="200"><br>微信支付</td>
+  </tr>
+</table>
+
+## 许可证
+
+[Apache 2.0](LICENSE)。随附的第三方资源列在 [`THIRD_PARTY_LICENSES.md`](THIRD_PARTY_LICENSES.md) 中。
+
+<sub>与 JetBrains 无关联。IntelliJ IDEA 是 JetBrains s.r.o. 的商标。</sub>

crates/ide-agent/src/external.rs

@@ -3,11 +3,13 @@
 //!
 //! Only the native providers keep transcripts on disk in a readable form: Claude Code
 //! (`<config>/projects/*/<id>.jsonl`, see `native::claude::history`) and Codex
-//! (`<home>/.codex/sessions/**`, rollout files with a `session_meta` line).
+//! (`<home>/.codex/sessions/**`, rollout files with a `session_meta` line, named in
+//! `<home>/.codex/session_index.jsonl`).
 
 use super::native::claude::history;
 use serde::Serialize;
 use specta::Type;
+use std::collections::HashMap;
 use std::io::BufRead;
 use std::path::{Path, PathBuf};
 
@@ -206,11 +208,39 @@ fn rollout_files(dir: &Path, depth: usize, out: &mut Vec<PathBuf>) {
     }
 }
 
-/// Codex sessions of the project at `root`: `<home>/.codex/sessions/**`.
+/// Thread names Codex keeps in `session_index.jsonl`, by thread id. A rename adds a line,
+/// so the last one wins.
+fn codex_names(codex_home: &Path) -> HashMap<String, String> {
+    let Ok(file) = std::fs::File::open(codex_home.join("session_index.jsonl")) else { return HashMap::new() };
+    let mut names = HashMap::new();
+    for line in std::io::BufReader::new(file).lines() {
+        let Ok(line) = line else { break };
+        let Ok(v) = serde_json::from_str::<serde_json::Value>(&line) else { continue };
+        let id = v.get("id").and_then(serde_json::Value::as_str);
+        let name = v.get("thread_name").and_then(serde_json::Value::as_str).map(str::trim).filter(|n| !n.is_empty());
+        if let (Some(id), Some(name)) = (id, name) {
+            names.insert(id.to_owned(), name.to_owned());
+        }
+    }
+    names
+}
+
+/// Codex sessions of the project at `root`: `<home>/.codex/sessions/**`, titled by their
+/// thread names, else by their first prompts.
 pub fn codex_sessions(codex_home: &Path, root: &Path) -> Vec<ExternalSession> {
     let mut files = Vec::new();
     rollout_files(&codex_home.join("sessions"), 4, &mut files);
-    files.iter().filter_map(|p| codex_file(p)).filter(|s| in_project(s.cwd.as_deref(), root)).collect()
+    let mut sessions: Vec<ExternalSession> =
+        files.iter().filter_map(|p| codex_file(p)).filter(|s| in_project(s.cwd.as_deref(), root)).collect();
+    if !sessions.is_empty() {
+        let names = codex_names(codex_home);
+        for s in &mut sessions {
+            if let Some(name) = names.get(&s.session_id) {
+                s.title = short(name);
+            }
+        }
+    }
+    sessions
 }
 
 #[cfg(test)]
@@ -282,6 +312,16 @@ mod tests {
         assert_eq!((s.provider.as_str(), s.session_id.as_str()), ("codex", "thread-1"));
         assert_eq!(s.title, "add tests");
         assert_eq!(s.cwd.as_deref(), Some("/work/app"));
+
+        write(
+            &tmp.path().join("session_index.jsonl"),
+            &[
+                json!({"id": "thread-1", "thread_name": "Add tests", "updated_at": "t1"}),
+                json!({"id": "thread-2", "thread_name": "Other", "updated_at": "t1"}),
+                json!({"id": "thread-1", "thread_name": "Add parser tests", "updated_at": "t2"}),
+            ],
+        );
+        assert_eq!(codex_sessions(tmp.path(), Path::new("/work"))[0].title, "Add parser tests");
     }
 
     #[test]

crates/ide-agent/src/lib.rs

@@ -1097,6 +1097,8 @@ impl AgentManager {
                 title_renamed: s.title_renamed,
             }
         };
+        // Copying may have started the source's agent: it stops again once idle.
+        source.release_when_idle();
         let task = Task::restore(file, self.shared.clone());
         self.tasks.write().insert(task.id.clone(), task.clone());
         task.persist();
@@ -1166,6 +1168,8 @@ impl AgentManager {
         task.persist();
         self.shared.emit(AgentEvent::Truncated { task: id.to_owned(), length: cut as u32 });
         task.emit_task();
+        // Undoing may have started the agent: it stops again once idle.
+        task.release_when_idle();
         Ok(first)
     }
 

crates/ide-agent/src/native/claude/history.rs

@@ -158,6 +158,42 @@ pub(crate) fn title(entries: &[Value]) -> Option<String> {
         .map(str::to_owned)
 }
 
+/// Claude Code titles a session from the last 1000 characters of its text.
+const TITLE_SOURCE_CHARS: usize = 1000;
+/// Below this Claude Code gives no title without asking the model.
+const TITLE_SOURCE_MIN_CHARS: usize = 10;
+
+/// The conversation's own text to title the session after: the prompts and the replies,
+/// without the files attached to the prompts. `None` while there is too little.
+pub(super) fn title_source(entries: &[Value]) -> Option<String> {
+    let mut text = String::new();
+    for e in chain(entries, None) {
+        if !(is_turn_start(e) || kind(e) == "assistant") {
+            continue;
+        }
+        let blocks = match e.pointer("/message/content") {
+            Some(Value::String(s)) => vec![s.as_str()],
+            Some(Value::Array(blocks)) => blocks
+                .iter()
+                .filter(|b| b.get("type").and_then(Value::as_str) == Some("text"))
+                .filter_map(|b| b.get("text").and_then(Value::as_str))
+                .filter(|t| !t.starts_with("\n<context ref="))
+                .collect(),
+            _ => Vec::new(),
+        };
+        for block in blocks {
+            text.push_str(block);
+            text.push('\n');
+        }
+    }
+    let text = text.trim();
+    let len = text.chars().count();
+    if len < TITLE_SOURCE_MIN_CHARS {
+        return None;
+    }
+    Some(text.chars().skip(len.saturating_sub(TITLE_SOURCE_CHARS)).collect())
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -219,6 +255,29 @@ mod tests {
         assert_eq!(cut(&c, 1), Ok(None));
     }
 
+    #[test]
+    fn titles_come_from_prompts_and_replies() {
+        let mut prompt = user("u1", None, "Fix the login form");
+        prompt["message"]["content"]
+            .as_array_mut()
+            .unwrap()
+            .push(json!({"type": "text", "text": "\n<context ref=\"file:///p/a.rs\">\nfn a() {}\n</context>"}));
+        let entries = vec![
+            prompt,
+            assistant(
+                "a1",
+                "u1",
+                json!([{"type": "thinking", "thinking": "hm"}, {"type": "text", "text": "Done."},
+                    {"type": "tool_use", "id": "t1", "name": "Bash", "input": {}}]),
+            ),
+            json!({"type": "user", "uuid": "r1", "parentUuid": "a1", "message": {"content": [{"type": "tool_result", "tool_use_id": "t1", "content": "out"}]}}),
+        ];
+        assert_eq!(title_source(&entries).as_deref(), Some("Fix the login form\nDone."));
+        assert_eq!(title_source(&[user("u1", None, "hi")]), None);
+        let long = "x".repeat(TITLE_SOURCE_CHARS + 5);
+        assert_eq!(title_source(&[user("u1", None, &long)]).map(|t| t.chars().count()), Some(TITLE_SOURCE_CHARS));
+    }
+
     #[test]
     fn project_directory_names() {
         assert_eq!(escape(Path::new("/private/tmp/a.b/c_d")), "-private-tmp-a-b-c-d");

crates/ide-agent/src/native/claude/mod.rs

@@ -191,6 +191,8 @@ struct State {
     limit_resets_ms: Option<f64>,
     terminal_only: Vec<String>,
     titled: bool,
+    /// A title is being read or generated.
+    titling: bool,
 }
 
 struct Turn {
@@ -365,6 +367,7 @@ impl Shim {
                 limit_resets_ms: None,
                 terminal_only: Vec::new(),
                 titled: false,
+                titling: false,
             }),
             cwd,
             starting: tokio::sync::Mutex::new(()),
@@ -583,11 +586,12 @@ impl Shim {
 impl super::Shim for Shim {
     fn attach(&self, client: Peer) {
         let _ = self.client.set(client.clone());
-        // The client went away: so do the processes.
-        let weak = self.me.clone();
+        // The client went away: so do the processes. Held until then: the connection drops
+        // its handler (this shim) as it closes, and the sessions would go without stopping.
+        let me = self.me.upgrade();
         tokio::spawn(async move {
             client.closed().await;
-            if let Some(me) = weak.upgrade() {
+            if let Some(me) = me {
                 me.closed.store(true, Ordering::Release);
                 let sessions: Vec<Arc<Session>> = me.sessions.lock().drain().map(|(_, s)| s).collect();
                 for s in sessions {
@@ -598,6 +602,15 @@ impl super::Shim for Shim {
     }
 }
 
+impl Drop for Session {
+    /// A session dropped without being stopped (the shim went away) takes its process along.
+    fn drop(&mut self) {
+        if let Some(p) = self.st.get_mut().proc.take() {
+            p.kill.cancel();
+        }
+    }
+}
+
 impl Session {
     fn shim(&self) -> Option<Arc<Shim>> {
         self.shim.upgrade()
@@ -1048,7 +1061,8 @@ impl Session {
                     } else if matches!(st.start, Start::New { .. }) {
                         st.start = Start::Resume { id: self.id.clone(), at: None };
                     }
-                    read_title = !st.titled;
+                    read_title = !st.titled && !st.titling;
+                    st.titling |= read_title;
                     if let Some(turn) = st.turn.as_ref()
                         && belongs(turn, &msg)
                     {
@@ -1073,13 +1087,29 @@ impl Session {
         }
     }
 
-    /// Sends the title Claude Code gave the session, once it has one.
+    /// Sends the session's title once it has one: the one in its transcript, or else one
+    /// Claude Code is asked for, as it titles no session run the way the Agent SDK runs it.
+    /// Without a title the next turn tries again.
     fn read_title(self: &Arc<Self>) {
         let me = self.clone();
-        tokio::task::spawn_blocking(move || {
-            let Some(title) = chain_title(&me) else { return };
-            me.st.lock().titled = true;
-            if let Some(shim) = me.shim() {
+        tokio::spawn(async move {
+            let reader = me.clone();
+            let entries = tokio::task::spawn_blocking(move || transcript_entries(&reader)).await.ok().flatten();
+            let mut title = entries.as_deref().and_then(history::title);
+            if title.is_none()
+                && let Some(source) = entries.as_deref().and_then(history::title_source)
+            {
+                title = me.generate_title(source).await;
+            }
+            {
+                let mut st = me.st.lock();
+                st.titling = false;
+                if title.is_none() {
+                    return;
+                }
+                st.titled = true;
+            }
+            if let (Some(title), Some(shim)) = (title, me.shim()) {
                 shim.notify(vec![Update {
                     session: me.id.clone(),
                     update: json!({ "sessionUpdate": "session_info_update", "title": title }),
@@ -1088,6 +1118,19 @@ impl Session {
         });
     }
 
+    /// A title Claude Code generates from `source`, also written to the transcript.
+    async fn generate_title(&self, source: String) -> Option<String> {
+        let proc = self.st.lock().proc.clone()?;
+        let request = json!({ "subtype": "generate_session_title", "description": source, "persist": true });
+        match proc.control(request).await {
+            Ok(r) => r.get("title").and_then(Value::as_str).map(str::trim).filter(|t| !t.is_empty()).map(str::to_owned),
+            Err(e) => {
+                tracing::debug!("generating a claude session title: {e}");
+                None
+            }
+        }
+    }
+
     async fn on_cli_request(self: &Arc<Self>, proc: &Arc<Proc>, msg: Value) {
         let id = msg.get("request_id").and_then(Value::as_str).unwrap_or_default().to_owned();
         let request = msg.get("request").cloned().unwrap_or_default();
@@ -1417,9 +1460,13 @@ fn strings(v: Option<&Value>) -> Vec<String> {
 
 /// The title in a session's transcript (or that of the session it continues).
 fn chain_title(session: &Session) -> Option<String> {
+    history::title(&transcript_entries(session)?)
+}
+
+fn transcript_entries(session: &Session) -> Option<Vec<Value>> {
     let shim = session.shim()?;
     let path = shim.transcript(&session.cwd, &session.id).filter(|p| p.exists())?;
-    history::title(&history::read(&path).ok()?)
+    history::read(&path).ok()
 }
 
 fn start_json(start: &Start) -> Value {

crates/ide-agent/src/native/claude/tests.rs

@@ -311,6 +311,8 @@ struct Replay {
     sent: Arc<Mutex<Vec<Vec<Value>>>>,
     launched: Mutex<Vec<Vec<String>>>,
     errors: Arc<Mutex<Vec<String>>>,
+    /// Each process's kill token.
+    kills: Mutex<Vec<CancellationToken>>,
 }
 
 impl Cli for Replay {
@@ -331,6 +333,7 @@ impl Cli for Replay {
         let (shim_in, cli_in) = tokio::io::duplex(1 << 20);
         let (mut cli_out, shim_out) = tokio::io::duplex(1 << 20);
         let kill = CancellationToken::new();
+        self.kills.lock().push(kill.clone());
         let (sent, errors, token) = (self.sent.clone(), self.errors.clone(), kill.clone());
         sent.lock().push(Vec::new());
         tokio::spawn(async move {
@@ -421,14 +424,18 @@ impl Replayed {
     }
 }
 
-async fn replay(name: &str) -> Replayed {
-    let processes = load_fixture(name);
-    let cli = Arc::new(Replay {
+fn replay_cli(processes: Vec<Vec<Frame>>) -> Arc<Replay> {
+    Arc::new(Replay {
         processes: Mutex::new(processes.into()),
         sent: Arc::default(),
         launched: Mutex::default(),
         errors: Arc::default(),
-    });
+        kills: Mutex::default(),
+    })
+}
+
+async fn replay(name: &str) -> Replayed {
+    let cli = replay_cli(load_fixture(name));
     let (config, cwd) = (tempfile::tempdir().unwrap(), tempfile::tempdir().unwrap());
     let cwd_path = std::fs::canonicalize(cwd.path()).unwrap();
     let h =
@@ -461,6 +468,69 @@ async fn replay_simple() {
     assert_eq!(user["message"]["content"][0]["text"], "Reply with exactly: hello there");
 }
 
+/// The app closing the connection (an idle task released, archived or deleted) stops the
+/// CLI processes of its sessions, idle ones included.
+#[tokio::test(flavor = "multi_thread")]
+async fn closing_the_connection_stops_the_processes() {
+    let r = replay("simple").await;
+    assert!(r.cli.kills.lock().iter().all(|k| !k.is_cancelled()));
+    r.h.client.kill();
+    let kills = r.cli.kills.lock().clone();
+    tokio::time::timeout(Duration::from_secs(5), async {
+        for k in kills {
+            k.cancelled().await;
+        }
+    })
+    .await
+    .expect("every process was stopped");
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn sessions_without_a_title_get_one_generated() {
+    let mut processes = load_fixture("simple");
+    processes[0].extend([
+        Frame::Shim(json!({"type": "control_request", "request_id": "req_3",
+            "request": {"subtype": "generate_session_title"}})),
+        Frame::Cli(json!({"type": "control_response",
+            "response": {"subtype": "success", "request_id": "req_3", "response": {"title": "Say hello"}}})),
+    ]);
+    let cli = replay_cli(processes);
+    let (config, cwd) = (tempfile::tempdir().unwrap(), tempfile::tempdir().unwrap());
+    let cwd_path = std::fs::canonicalize(cwd.path()).unwrap();
+    let h = Harness::connect(
+        cli.clone(),
+        config.path().into(),
+        config.path().join("pending"),
+        cwd_path.clone(),
+        Vec::new(),
+    )
+    .await;
+    let session = h.new_session().await;
+    // The transcript Claude Code writes, without the title it gives sessions in a terminal.
+    let dir = config.path().join("projects").join(history::escape(&cwd_path));
+    std::fs::create_dir_all(&dir).unwrap();
+    let prompt = json!({"type": "user", "uuid": "u1", "parentUuid": null,
+        "message": {"role": "user", "content": "Reply with exactly: hello there"}});
+    std::fs::write(dir.join(format!("{session}.jsonl")), format!("{prompt}\n")).unwrap();
+
+    h.prompt(&session, "Reply with exactly: hello there").await.unwrap();
+    let mut titles = Vec::new();
+    for _ in 0..100 {
+        titles = h.updates(&session, "session_info_update");
+        if !titles.is_empty() {
+            break;
+        }
+        tokio::time::sleep(Duration::from_millis(20)).await;
+    }
+    assert!(cli.errors.lock().is_empty(), "{:?}", cli.errors.lock());
+    assert_eq!(titles.iter().map(|t| t["title"].clone()).collect::<Vec<_>>(), [json!("Say hello")]);
+    let sent = cli.sent.lock()[0].clone();
+    let request =
+        sent.iter().find(|m| m.pointer("/request/subtype") == Some(&json!("generate_session_title"))).unwrap();
+    assert_eq!(request["request"]["description"], "Reply with exactly: hello there");
+    assert_eq!(request["request"]["persist"], true);
+}
+
 #[tokio::test(flavor = "multi_thread")]
 async fn replay_multi_turn() {
     let r = replay("multi_turn").await;
@@ -727,6 +797,7 @@ async fn a_stop_ahead_of_its_prompt_cancels_it() {
         sent: Arc::default(),
         launched: Mutex::default(),
         errors: Arc::default(),
+        kills: Mutex::default(),
     });
     let (dir, cwd) = (tempfile::tempdir().unwrap(), tempfile::tempdir().unwrap());
     let h = Harness::connect(cli.clone(), dir.path().into(), dir.path().join("p"), cwd.path().into(), Vec::new()).await;
@@ -770,6 +841,7 @@ async fn a_failed_turn_reports_its_failure() {
             sent: Arc::default(),
             launched: Mutex::default(),
             errors: Arc::default(),
+            kills: Mutex::default(),
         });
         let (dir, cwd) = (tempfile::tempdir().unwrap(), tempfile::tempdir().unwrap());
         let h =

crates/ide-agent/src/native/codex/mod.rs

@@ -28,6 +28,9 @@ const OUTPUT_EVERY: Duration = Duration::from_millis(200);
 const EARLY_CANCEL: Duration = Duration::from_secs(1);
 /// How long the client's connection outlives codex.
 const EXIT_GRACE: Duration = Duration::from_millis(100);
+/// What a thread's name is asked for with, after its first turn.
+const NAME_PROMPT: &str = "Name this conversation for a list of tasks: a short title of at most six words, in the \
+    language the user writes in. Reply with the title only, without quotes or a closing period.";
 
 pub(crate) fn connect(
     spec: &ProviderSpec,
@@ -126,6 +129,10 @@ struct Thread {
     early_cancel: Option<Instant>,
     /// The latest agent message (a subagent's answer).
     answer: String,
+    /// The thread has a name.
+    named: bool,
+    /// A name is being asked for.
+    naming: bool,
 }
 
 struct PendingPrompt {
@@ -329,6 +336,7 @@ impl CodexShim {
         t.parent = None;
         t.settings = Some(settings);
         t.cwd = cwd;
+        t.named = thread.get("name").and_then(Value::as_str).is_some_and(|n| !n.trim().is_empty());
         (id, options)
     }
 
@@ -625,8 +633,9 @@ impl CodexShim {
                 Some(translate::plan(params))
             }),
             "thread/tokenUsage/updated" => self.with_thread(thread, |_, _| translate::usage(params)),
-            "thread/name/updated" => self.with_thread(thread, |_, _| {
+            "thread/name/updated" => self.with_thread(thread, |t, _| {
                 let title = params.get("threadName").and_then(Value::as_str)?;
+                t.named = true;
                 Some(json!({ "sessionUpdate": "session_info_update", "title": title }))
             }),
             "thread/started" => self.thread_started(params.get("thread").unwrap_or(&Value::Null)),
@@ -812,9 +821,10 @@ impl CodexShim {
         }
     }
 
-    fn turn_completed(&self, thread: &str, turn: &Value) {
+    fn turn_completed(self: &Arc<Self>, thread: &str, turn: &Value) {
         let id = turn.get("id").and_then(Value::as_str).unwrap_or_default();
-        let (parent, answer) = {
+        let completed = turn.get("status").and_then(Value::as_str) == Some("completed");
+        let (parent, answer, name) = {
             let mut state = self.state.lock();
             let Some(t) = state.threads.get_mut(thread) else { return };
             if t.turn.as_deref().is_none_or(|r| r == id) {
@@ -830,8 +840,15 @@ impl CodexShim {
                 let _ = p.done.send((turn.clone(), error.clone()));
             }
             let answer = std::mem::take(&mut t.answer);
-            (t.parent.clone(), (answer, error))
+            let name =
+                completed && !id.is_empty() && t.parent.is_none() && t.settings.is_some() && !t.named && !t.naming;
+            t.naming |= name;
+            (t.parent.clone(), (answer, error), name)
         };
+        if name {
+            let (shim, thread, turn) = (self.clone(), thread.to_owned(), id.to_owned());
+            self.runtime.spawn(async move { shim.name_thread(&thread, &turn).await });
+        }
         let Some(parent) = parent else { return };
         let (answer, error) = answer;
         let mut state_of = match turn.get("status").and_then(Value::as_str) {
@@ -853,6 +870,28 @@ impl CodexShim {
         }
     }
 
+    /// Names a thread from what it holds after `turn`, as codex leaves naming to its
+    /// clients; `thread/name/updated` brings the name back. Unnamed, the next turn tries again.
+    async fn name_thread(&self, thread: &str, turn: &str) {
+        let sample = json!({ "threadId": thread, "expectedTurnId": turn, "prompt": NAME_PROMPT, "effort": "low" });
+        let named = match self.call("thread/sample", sample).await {
+            Ok(r) => match r.get("text").and_then(Value::as_str).and_then(translate::thread_name) {
+                Some(name) => {
+                    self.call("thread/name/set", json!({ "threadId": thread, "name": name })).await.map(|_| ())
+                }
+                None => Err(error(codes::INTERNAL_ERROR, "codex gave no name")),
+            },
+            Err(e) => Err(e),
+        };
+        if let Err(e) = &named {
+            tracing::debug!("naming codex thread {thread}: {}", e.message);
+        }
+        if let Some(t) = self.state.lock().threads.get_mut(thread) {
+            t.naming = false;
+            t.named |= named.is_ok();
+        }
+    }
+
     /// Requests from codex: approvals and questions, asked as ACP permission requests.
     fn on_codex_request(&self, method: &str, params: &Value) -> Result<Value, (i64, String)> {
         let thread = params.get("threadId").and_then(Value::as_str).unwrap_or_default().to_owned();

crates/ide-agent/src/native/codex/tests.rs

@@ -535,8 +535,10 @@ async fn play<R: AsyncRead + Unpin, W: AsyncWrite + Unpin>(
                     .unwrap()
                     .unwrap_or_else(|| panic!("the shim closed before {frame}"));
                 let actual: Value = serde_json::from_str(&line).unwrap();
-                // Older recordings predate skill discovery; play an unsupported server.
-                if actual["method"] == "skills/list" && frame["method"] != "skills/list" {
+                // Older recordings predate skill discovery and thread naming; play an
+                // unsupported server.
+                let method = actual["method"].as_str().unwrap_or_default();
+                if matches!(method, "skills/list" | "thread/sample") && frame["method"] != method {
                     let reply = json!({ "id": actual["id"], "error": { "code": -32601, "message": "unsupported" } });
                     write.write_all(format!("{reply}\n").as_bytes()).await.unwrap();
                     continue;
@@ -574,7 +576,14 @@ async fn play<R: AsyncRead + Unpin, W: AsyncWrite + Unpin>(
 /// Runs `scenario` against its transcript; returns the ACP results, the client and
 /// the frames the shim sent.
 async fn replay(scenario: Scenario) -> (Results, Arc<Client>, Vec<Value>, Value) {
-    let t = load(scenario.file());
+    let (results, client, sent, meta, _codex) = replay_transcript(scenario, load(scenario.file())).await;
+    (results, client, sent, meta)
+}
+
+/// Both connections of a replay, which stay open while it is held.
+type CodexEnd = Box<dyn std::any::Any>;
+
+async fn replay_transcript(scenario: Scenario, t: Transcript) -> (Results, Arc<Client>, Vec<Value>, Value, CodexEnd) {
     let (ours, theirs) = tokio::io::duplex(1 << 20);
     let (tr, tw) = tokio::io::split(theirs);
     let client = Arc::new(Client::default());
@@ -590,8 +599,8 @@ async fn replay(scenario: Scenario) -> (Results, Arc<Client>, Vec<Value>, Value)
         .await
         .expect("the scenario finished");
     // Codex stays up until the scenario is over.
-    let (sent, _read, _write) = player.await.unwrap();
-    (results, client, sent, meta)
+    let (sent, read, write) = player.await.unwrap();
+    (results, client, sent, meta, Box::new((acp, read, write)))
 }
 
 fn sent<'a>(frames: &'a [Value], method: &str) -> Vec<&'a Value> {
@@ -801,6 +810,42 @@ async fn a_simple_turn_streams_reasoning_text_and_usage() {
     assert_eq!(info["title"], "Say hi");
 }
 
+#[tokio::test(flavor = "multi_thread")]
+async fn an_unnamed_thread_is_named_after_its_first_turn() {
+    let mut t = load(Scenario::Simple.file());
+    t.frames.retain(|(_, f)| f["method"] != "thread/name/updated");
+    let thread = "01a18300-0000-7000-8000-000000000001";
+    t.frames.extend([
+        (true, json!({"id": 90, "method": "thread/sample"})),
+        (false, json!({"id": 90, "result": {"responseId": "r", "sourceTurnId": thread, "text": "\"Say hi.\"\n"}})),
+        (true, json!({"id": 91, "method": "thread/name/set"})),
+        (false, json!({"id": 91, "result": {}})),
+        (false, json!({"method": "thread/name/updated", "params": {"threadId": thread, "threadName": "Say hi"}})),
+    ]);
+    let (results, client, frames, _, _codex) = replay_transcript(Scenario::Simple, t).await;
+    let session = session_of(&results, "new");
+    let sample = &sent(&frames, "thread/sample")[0]["params"];
+    assert_eq!((sample["threadId"].as_str(), sample["expectedTurnId"].as_str()), (Some(thread), Some(thread)));
+    assert_eq!(sent(&frames, "thread/name/set")[0]["params"], json!({"threadId": thread, "name": "Say hi"}));
+    let mut info = Vec::new();
+    for _ in 0..100 {
+        info = client.of(&session).into_iter().filter(|u| u["sessionUpdate"] == "session_info_update").collect();
+        if !info.is_empty() {
+            break;
+        }
+        tokio::time::sleep(Duration::from_millis(20)).await;
+    }
+    assert_eq!(info.iter().map(|u| u["title"].clone()).collect::<Vec<_>>(), [json!("Say hi")]);
+}
+
+#[test]
+fn thread_names_are_the_first_line_of_the_reply() {
+    assert_eq!(thread_name("  \n“修复登录表单。”\nmore").as_deref(), Some("修复登录表单"));
+    assert_eq!(thread_name("**Fix the login form.**").as_deref(), Some("Fix the login form"));
+    assert_eq!(thread_name(" \n\"\" "), None);
+    assert_eq!(thread_name(&"x".repeat(100)).map(|n| n.chars().count()), Some(80));
+}
+
 #[tokio::test(flavor = "multi_thread")]
 async fn settings_apply_to_the_next_turn() {
     let (results, client, frames, _) = replay(Scenario::MultiTurn).await;

crates/ide-agent/src/native/codex/translate.rs

@@ -612,6 +612,16 @@ pub(super) fn usage(params: &Value) -> Option<Value> {
     Some(json!({ "sessionUpdate": "usage_update", "used": used, "size": size }))
 }
 
+/// A thread name from the model's reply to the naming prompt: its first line, without
+/// quotes or a closing period. `None` when nothing is left.
+pub(super) fn thread_name(reply: &str) -> Option<String> {
+    const MAX_NAME: usize = 80;
+    let line = reply.lines().map(str::trim).find(|l| !l.is_empty())?;
+    let line = line.trim_matches(|c: char| matches!(c, '"' | '\'' | '`' | '“' | '”' | '「' | '」' | '*'));
+    let line = line.trim_end_matches(['.', '。']).trim();
+    (!line.is_empty()).then(|| line.chars().take(MAX_NAME).collect())
+}
+
 /// How a failed turn is reported.
 #[derive(Debug, PartialEq)]
 pub(super) enum Failure {

crates/ide-agent/src/tests.rs

@@ -2391,6 +2391,27 @@ async fn idle_agents_stop_and_resume_their_session_on_the_next_message() {
     assert!(live(&mgr, &task.id));
     mgr.shutdown();
 
+    // Undoing turns or copying the conversation starts a stopped agent: it stops again too.
+    let tmp = tempfile::tempdir().unwrap();
+    let agent = Arc::new(FakeAgent::default());
+    let mgr = manager(tmp.path(), agent.clone());
+    mgr.set_idle_release(Duration::from_millis(200));
+    let task = mgr.create(new()).await.unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Ready).await;
+    mgr.prompt(&task.id, text("again"), false).await.unwrap();
+    wait_for(&mgr, &task.id, AgentStatus::Ready).await;
+    tokio::time::sleep(Duration::from_millis(600)).await;
+    assert!(!live(&mgr, &task.id));
+    mgr.rollback(&task.id, 1).await.unwrap();
+    assert!(live(&mgr, &task.id));
+    tokio::time::sleep(Duration::from_millis(600)).await;
+    assert!(!live(&mgr, &task.id), "an agent started to undo turns stops too");
+    mgr.fork(&task.id, None).await.unwrap();
+    assert!(live(&mgr, &task.id));
+    tokio::time::sleep(Duration::from_millis(600)).await;
+    assert!(!live(&mgr, &task.id), "an agent started to copy the conversation stops too");
+    mgr.shutdown();
+
     // An agent that can't reload its session keeps running: stopping it would lose the conversation.
     let tmp = tempfile::tempdir().unwrap();
     let agent = Arc::new(FakeAgent { no_load: true, ..FakeAgent::default() });

crates/ide-core/src/editor_settings.rs

@@ -270,6 +270,8 @@ pub struct SmartKeysSettings {
     pub pair_quotes: bool,
     pub surround_selection: bool,
     pub tab_out_of_pair: bool,
+    /// Simultaneous `<tag></tag>` editing: renaming a tag renames its matching tag.
+    pub simultaneous_tag_editing: bool,
     /// Reformat on paste: `none` | `indentBlock` | `indentEachLine`.
     pub reformat_on_paste: String,
     pub escape_on_paste: bool,
@@ -289,6 +291,7 @@ impl Default for SmartKeysSettings {
             pair_quotes: true,
             surround_selection: true,
             tab_out_of_pair: true,
+            simultaneous_tag_editing: true,
             reformat_on_paste: "indentEachLine".into(),
             escape_on_paste: true,
             smart_indent: true,

crates/ide-dap/Cargo.toml

@@ -28,6 +28,9 @@ tracing.workspace = true
 [target.'cfg(unix)'.dependencies]
 libc = "0.2"
 
+[target.'cfg(windows)'.dependencies]
+windows-sys = { version = "0.61", features = ["Wdk_System_Threading", "Win32_Foundation", "Win32_System_Diagnostics_ToolHelp", "Win32_System_Threading"] }
+
 [dev-dependencies]
 tracing-subscriber.workspace = true
 tokio = { workspace = true, features = ["net", "rt-multi-thread", "macros", "test-util"] }

crates/ide-dap/src/attach.rs

@@ -1,6 +1,7 @@
 //! Attach to Process: the current user's processes, grouped by the debugger that can
 //! attach to them (IDEA's `XAttachDebuggerProvider`s): JVMs with a JDWP agent, Node,
-//! Python (debugpy injection), Go binaries (Delve) and anything else natively (LLDB).
+//! Python (debugpy injection), .NET (netcoredbg), Go binaries (Delve) and anything else
+//! natively (LLDB).
 
 use crate::adapter;
 use ide_core::{IdeError, IdeResult};
@@ -14,6 +15,7 @@ pub enum AttachKind {
     Java,
     Node,
     Python,
+    Dotnet,
     Go,
     Native,
 }
@@ -95,13 +97,29 @@ fn file_name(path: &str) -> &str {
     path.rsplit(['/', '\\']).next().unwrap_or(path)
 }
 
+/// A .NET app: the `dotnet` host, or an apphost next to its `<name>.runtimeconfig.json`.
+pub fn is_dotnet(exe: &str) -> bool {
+    let path = Path::new(exe);
+    let Some(stem) = path.file_stem().and_then(|s| s.to_str()) else { return false };
+    if stem == "dotnet" {
+        return true;
+    }
+    path.is_absolute() && path.with_file_name(format!("{stem}.runtimeconfig.json")).is_file()
+}
+
 fn is_python(name: &str) -> bool {
     let n = name.strip_suffix(".exe").unwrap_or(name);
     n == "Python" || n.strip_prefix("python").is_some_and(|v| v.chars().all(|c| c.is_ascii_digit() || c == '.'))
 }
 
-/// Classifies a process; `is_go` is asked only for processes no interpreter claims.
-pub fn classify(p: &RawProcess, is_go: impl Fn(&str) -> bool, native_adapter: &str) -> Option<AttachableProcess> {
+/// Classifies a process; `is_dotnet` and `is_go` are asked only for processes no
+/// interpreter claims.
+pub fn classify(
+    p: &RawProcess,
+    is_dotnet: impl Fn(&str) -> bool,
+    is_go: impl Fn(&str) -> bool,
+    native_adapter: &str,
+) -> Option<AttachableProcess> {
     let name = file_name(&p.exe).to_owned();
     let make = |kind, adapter: &str, addr: Option<(Option<String>, u16)>| {
         let (host, port) = match addr {
@@ -129,6 +147,9 @@ pub fn classify(p: &RawProcess, is_go: impl Fn(&str) -> bool, native_adapter: &s
     if is_python(&name) {
         return make(AttachKind::Python, "debugpy", debugpy_listen(&p.args));
     }
+    if is_dotnet(&p.exe) {
+        return make(AttachKind::Dotnet, "netcoredbg", None);
+    }
     if is_go(&p.exe) {
         return make(AttachKind::Go, "delve", None);
     }
@@ -143,7 +164,7 @@ const GO_SCAN_LIMIT: u64 = 96 << 20;
 pub fn is_go_binary(exe: &str) -> bool {
     use std::io::Read;
     let skip = ["/System/", "/usr/", "/bin/", "/sbin/", "/Library/Apple/", "/Applications/"];
-    if skip.iter().any(|p| exe.starts_with(p)) || !Path::new(exe).is_absolute() {
+    if skip.iter().any(|p| exe.starts_with(p)) || is_windows_system(exe) || !Path::new(exe).is_absolute() {
         return false;
     }
     let Ok(file) = std::fs::File::open(exe) else { return false };
@@ -165,6 +186,17 @@ pub fn is_go_binary(exe: &str) -> bool {
     }
 }
 
+/// Windows' own and installed programs (`C:\Windows\…`, `C:\Program Files…`), like the
+/// system locations skipped on Unix.
+fn is_windows_system(exe: &str) -> bool {
+    let lower = exe.to_ascii_lowercase();
+    lower.get(1..).is_some_and(|rest| {
+        rest.starts_with(":\\windows\\")
+            || rest.starts_with(":\\program files\\")
+            || rest.starts_with(":\\program files (x86)\\")
+    })
+}
+
 /// The current user's processes (without this one).
 #[cfg(unix)]
 pub fn list_processes() -> IdeResult<Vec<RawProcess>> {
@@ -181,7 +213,7 @@ pub fn list_processes() -> IdeResult<Vec<RawProcess>> {
         let (pid, rest) = line.split_once(char::is_whitespace)?;
         Some((pid.parse().ok()?, rest.trim().to_owned()))
     };
-    // `comm` is the executable path on macOS; on Linux it is truncated, so read /proc.
+    // `comm` is the executable path as started on macOS; on Linux it is truncated, so read /proc.
     let exes: HashMap<u32, String> =
         if cfg!(target_os = "linux") { HashMap::new() } else { ps("pid=,comm=")?.lines().filter_map(split).collect() };
     let me = std::process::id();
@@ -190,9 +222,8 @@ pub fn list_processes() -> IdeResult<Vec<RawProcess>> {
         .filter_map(split)
         .filter(|(pid, _)| *pid != me)
         .map(|(pid, args)| {
-            let exe = exes
-                .get(&pid)
-                .cloned()
+            let exe = exe_path(pid)
+                .or_else(|| exes.get(&pid).cloned())
                 .or_else(|| std::fs::read_link(format!("/proc/{pid}/exe")).ok().map(|p| p.display().to_string()))
                 .unwrap_or_else(|| args.split_whitespace().next().unwrap_or_default().to_owned());
             RawProcess { pid, exe, args }
@@ -200,9 +231,134 @@ pub fn list_processes() -> IdeResult<Vec<RawProcess>> {
         .collect())
 }
 
-#[cfg(not(unix))]
+/// The processes this user may open (without this one): system and other users'
+/// processes refuse `PROCESS_QUERY_LIMITED_INFORMATION` and are left out.
+#[cfg(windows)]
 pub fn list_processes() -> IdeResult<Vec<RawProcess>> {
-    Err(IdeError::unavailable("Attach to Process is not supported on this platform yet"))
+    windows_processes::list()
+}
+
+#[cfg(windows)]
+mod windows_processes {
+    use super::RawProcess;
+    use ide_core::{IdeError, IdeResult};
+    use std::os::windows::io::{AsRawHandle, FromRawHandle, OwnedHandle};
+    use windows_sys::Wdk::System::Threading::{NtQueryInformationProcess, ProcessCommandLineInformation};
+    use windows_sys::Win32::Foundation::{INVALID_HANDLE_VALUE, UNICODE_STRING};
+    use windows_sys::Win32::System::Diagnostics::ToolHelp::{
+        CreateToolhelp32Snapshot, PROCESSENTRY32W, Process32FirstW, Process32NextW, TH32CS_SNAPPROCESS,
+    };
+    use windows_sys::Win32::System::Threading::{
+        OpenProcess, PROCESS_NAME_WIN32, PROCESS_QUERY_LIMITED_INFORMATION, QueryFullProcessImageNameW,
+    };
+
+    pub fn list() -> IdeResult<Vec<RawProcess>> {
+        let me = std::process::id();
+        Ok(pids()?
+            .into_iter()
+            .filter(|&pid| pid != 0 && pid != me)
+            .filter_map(|pid| {
+                // SAFETY: plain call; a non-null result is a process handle owned here.
+                let handle = unsafe { OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, 0, pid) };
+                if handle.is_null() {
+                    return None;
+                }
+                // SAFETY: as above.
+                let process = unsafe { OwnedHandle::from_raw_handle(handle) };
+                let exe = image_path(&process)?;
+                let args = command_line(&process).unwrap_or_else(|| exe.clone());
+                Some(RawProcess { pid, exe, args })
+            })
+            .collect())
+    }
+
+    fn pids() -> IdeResult<Vec<u32>> {
+        let mut out = Vec::new();
+        // SAFETY: a snapshot handle owned here and an entry sized as the API requires.
+        unsafe {
+            let snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
+            if snapshot.is_null() || snapshot == INVALID_HANDLE_VALUE {
+                return Err(IdeError::unavailable(format!(
+                    "cannot list processes: {}",
+                    std::io::Error::last_os_error()
+                )));
+            }
+            let snapshot = OwnedHandle::from_raw_handle(snapshot);
+            let mut entry = PROCESSENTRY32W { dwSize: size_of::<PROCESSENTRY32W>() as u32, ..Default::default() };
+            let mut more = Process32FirstW(snapshot.as_raw_handle(), &mut entry);
+            while more != 0 {
+                out.push(entry.th32ProcessID);
+                more = Process32NextW(snapshot.as_raw_handle(), &mut entry);
+            }
+        }
+        Ok(out)
+    }
+
+    fn image_path(process: &OwnedHandle) -> Option<String> {
+        let mut buf = vec![0u16; 32 * 1024];
+        let mut len = buf.len() as u32;
+        // SAFETY: a live process handle with query access; `len` is the buffer's capacity.
+        let ok = unsafe {
+            QueryFullProcessImageNameW(process.as_raw_handle(), PROCESS_NAME_WIN32, buf.as_mut_ptr(), &mut len)
+        };
+        (ok != 0).then(|| String::from_utf16_lossy(&buf[..len as usize]))
+    }
+
+    /// The command line (Windows 8.1+), read with the same limited query access.
+    fn command_line(process: &OwnedHandle) -> Option<String> {
+        let mut size = 0u32;
+        // SAFETY: a size query with no buffer; it fails and reports the size it needs.
+        unsafe {
+            NtQueryInformationProcess(
+                process.as_raw_handle(),
+                ProcessCommandLineInformation,
+                std::ptr::null_mut(),
+                0,
+                &mut size,
+            )
+        };
+        if (size as usize) < size_of::<UNICODE_STRING>() {
+            return None;
+        }
+        // u64 elements keep the UNICODE_STRING header aligned.
+        let mut buf = vec![0u64; (size as usize).div_ceil(8)];
+        // SAFETY: a buffer of at least `size` bytes.
+        let status = unsafe {
+            NtQueryInformationProcess(
+                process.as_raw_handle(),
+                ProcessCommandLineInformation,
+                buf.as_mut_ptr().cast(),
+                size,
+                &mut size,
+            )
+        };
+        if status < 0 {
+            return None;
+        }
+        // SAFETY: on success the buffer starts with a UNICODE_STRING whose text lies inside it.
+        let text = unsafe {
+            let s = &*buf.as_ptr().cast::<UNICODE_STRING>();
+            if s.Buffer.is_null() {
+                return None;
+            }
+            std::slice::from_raw_parts(s.Buffer, usize::from(s.Length) / 2)
+        };
+        Some(String::from_utf16_lossy(text))
+    }
+}
+
+/// The full executable path: `comm` keeps a relative path a process was started with.
+#[cfg(target_os = "macos")]
+fn exe_path(pid: u32) -> Option<String> {
+    let mut buf = vec![0u8; libc::PROC_PIDPATHINFO_MAXSIZE as usize];
+    // SAFETY: the buffer holds `PROC_PIDPATHINFO_MAXSIZE` bytes, as the call requires.
+    let n = unsafe { libc::proc_pidpath(i32::try_from(pid).ok()?, buf.as_mut_ptr().cast(), buf.len() as u32) };
+    (n > 0).then(|| String::from_utf8_lossy(&buf[..n as usize]).into_owned())
+}
+
+#[cfg(all(unix, not(target_os = "macos")))]
+fn exe_path(_pid: u32) -> Option<String> {
+    None
 }
 
 /// Node's default inspector port, which `SIGUSR1` opens.
@@ -244,7 +400,7 @@ pub fn attachable_processes() -> IdeResult<Vec<AttachableProcess>> {
     let cwd = std::env::temp_dir();
     let native = if adapter::resolve_binary("codelldb", &cwd).is_some() { "codelldb" } else { "lldb-dap" };
     let mut out: Vec<AttachableProcess> =
-        list_processes()?.iter().filter_map(|p| classify(p, is_go_binary, native)).collect();
+        list_processes()?.iter().filter_map(|p| classify(p, is_dotnet, is_go_binary, native)).collect();
     out.sort_by(|a, b| a.kind.cmp(&b.kind).then_with(|| a.name.to_lowercase().cmp(&b.name.to_lowercase())));
     Ok(out)
 }
@@ -258,7 +414,8 @@ mod tests {
     }
 
     fn kind(exe: &str, args: &str) -> Option<(AttachKind, Option<u16>)> {
-        classify(&raw(exe, args), |e| e.ends_with("/gosrv"), "codelldb").map(|p| (p.kind, p.port))
+        classify(&raw(exe, args), |e| e.ends_with("/Api"), |e| e.ends_with("/gosrv"), "codelldb")
+            .map(|p| (p.kind, p.port))
     }
 
     #[test]
@@ -292,11 +449,37 @@ mod tests {
             kind("/Library/Frameworks/Python.framework/Versions/3.12/Resources/Python.app/Contents/MacOS/Python", "x"),
             Some((AttachKind::Python, None))
         );
+        assert_eq!(kind("/home/me/Api", "./Api"), Some((AttachKind::Dotnet, None)));
         assert_eq!(kind("/home/me/gosrv", "./gosrv"), Some((AttachKind::Go, None)));
         assert_eq!(kind("/home/me/a.out", "./a.out"), Some((AttachKind::Native, None)));
         assert!(!is_python("pythonista"));
     }
 
+    #[test]
+    fn detects_dotnet_hosts_and_apphosts() {
+        let dir = std::env::temp_dir().join(format!("openidea-attach-dotnet-{}", std::process::id()));
+        std::fs::create_dir_all(&dir).unwrap();
+        let app = dir.join("Api");
+        std::fs::write(&app, b"").unwrap();
+        std::fs::write(dir.join("Api.runtimeconfig.json"), b"{}").unwrap();
+        let tool = dir.join("tool");
+        std::fs::write(&tool, b"").unwrap();
+        assert!(is_dotnet(app.to_str().unwrap()));
+        assert!(!is_dotnet(tool.to_str().unwrap()));
+        assert!(is_dotnet("/usr/local/share/dotnet/dotnet"));
+        assert!(is_dotnet("dotnet"));
+        assert!(!is_dotnet("Api"));
+        std::fs::remove_dir_all(&dir).unwrap();
+    }
+
+    #[test]
+    fn skips_windows_system_programs() {
+        assert!(is_windows_system(r"C:\Windows\System32\svchost.exe"));
+        assert!(is_windows_system(r"c:\program files (x86)\App\app.exe"));
+        assert!(!is_windows_system(r"D:\src\srv\srv.exe"));
+        assert!(!is_windows_system("/usr/bin/true"));
+    }
+
     #[test]
     fn detects_go_binaries_by_buildinfo() {
         let dir = std::env::temp_dir().join(format!("openidea-attach-{}", std::process::id()));

crates/ide-dap/tests/real_adapters.rs

@@ -557,6 +557,17 @@ async fn attach_to_processes() {
             extra: |pid, _| serde_json::json!({"pid": pid}),
         },
     ];
+    // A .NET app built into `dotnet/bin` (`<OutDir>bin</OutDir>`), attached by its apphost.
+    let dotnet_app = dir.join("dotnet/bin").join(if cfg!(windows) { "Server.exe" } else { "Server" });
+    if dotnet_app.is_file() {
+        cases.push(AttachCase {
+            kind: attach::AttachKind::Dotnet,
+            command: vec![s(&dotnet_app)],
+            source: dir.join("dotnet/Program.cs"),
+            line: 1,
+            extra: |pid, _| serde_json::json!({"processId": pid, "justMyCode": true}),
+        });
+    }
     if java_server.is_some() {
         cases.insert(
             0,

crates/ide-host/src/lib.rs

@@ -180,6 +180,7 @@ impl Host {
             open_locks: Default::default(),
         };
         host.apply_proxy();
+        ops::agent::move_user_mcp_values(&host);
         host
     }
 

crates/ide-host/src/ops/agent.rs

@@ -2,6 +2,7 @@
 //! window they run on the host, next to the project they work on.
 use super::{Channel, Emit};
 use crate::Host;
+use crate::agent_secrets::{AgentSecrets, Kept};
 use crate::rpc::Dispatcher;
 use ide_agent::registry::{AgentRegistry, RegistryPaths};
 use ide_agent::{
@@ -342,8 +343,77 @@ pub async fn accept_changes(
 
 type McpServerMap = std::collections::BTreeMap<String, ide_core::settings::AgentMcpServer>;
 
+/// Where the values of the user's MCP servers are kept in [`AgentSecrets`]. A project's own
+/// servers keep their values in the project's file, where the project shares them.
+const USER_MCP_VALUES: &str = "mcp/user/";
+
+/// Every environment variable and header value of `map`, by its key in [`AgentSecrets`].
+fn mcp_values(map: &mut McpServerMap) -> Vec<(String, &mut String)> {
+    let part = |s: &str| s.replace('%', "%25").replace('/', "%2F");
+    let mut values = Vec::new();
+    for (server, cfg) in map.iter_mut() {
+        for (kind, entries) in [("env", &mut cfg.env), ("header", &mut cfg.headers)] {
+            for (name, value) in entries.iter_mut() {
+                values.push((format!("{USER_MCP_VALUES}{}/{kind}/{}", part(server), part(name)), value));
+            }
+        }
+    }
+    values
+}
+
+fn has_mcp_values(map: &McpServerMap) -> bool {
+    map.values().any(|s| s.env.values().chain(s.headers.values()).any(|v| !v.is_empty()))
+}
+
+/// Fills in the saved values. A value written in the settings file wins: an empty one stands for the saved one.
+fn fill_mcp_values(secrets: &AgentSecrets, map: &mut McpServerMap) {
+    for (key, value) in mcp_values(map) {
+        if value.is_empty()
+            && let Some(saved) = secrets.get(&key)
+        {
+            *value = saved;
+        }
+    }
+}
+
+/// Saves the values of `map` and empties them in it; values of servers and names no
+/// longer in it are forgotten.
+fn take_mcp_values(secrets: &AgentSecrets, map: &mut McpServerMap) -> IdeResult<Kept> {
+    let mut kept = Kept::Store;
+    let mut current = HashSet::new();
+    for (key, value) in mcp_values(map) {
+        if value.is_empty() {
+            secrets.delete(&key);
+        } else if secrets.get(&key).as_deref() != Some(value.as_str()) && secrets.set(&key, value)? == Kept::LocalFile {
+            kept = Kept::LocalFile;
+        }
+        value.clear();
+        current.insert(key);
+    }
+    for key in secrets.keys(USER_MCP_VALUES) {
+        if !current.contains(&key) {
+            secrets.delete(&key);
+        }
+    }
+    Ok(kept)
+}
+
+/// Values written into the user settings (by hand, by an older version, by an import) move to [`AgentSecrets`].
+pub fn move_user_mcp_values(host: &Host) {
+    let mut user = host.global_settings.effective().agents.mcp_servers;
+    if !has_mcp_values(&user) {
+        return;
+    }
+    fill_mcp_values(&host.agent_secrets, &mut user);
+    if let Err(e) = persist_mcp_map(host, None, McpScope::User, &user) {
+        tracing::warn!("MCP servers: could not move values out of the user settings: {}", e.message);
+    }
+}
+
 fn mcp_maps(host: &Host, window: &str) -> (McpServerMap, McpServerMap, Option<std::sync::Arc<crate::Project>>) {
-    let user = host.global_settings.effective().agents.mcp_servers;
+    move_user_mcp_values(host);
+    let mut user = host.global_settings.effective().agents.mcp_servers;
+    fill_mcp_values(&host.agent_secrets, &mut user);
     let project = host.project(window).ok().filter(|p| !p.light);
     let workspace = project
         .as_ref()
@@ -358,10 +428,15 @@ fn persist_mcp_map(
     scope: McpScope,
     map: &McpServerMap,
 ) -> IdeResult<()> {
+    let mut map = map.clone();
+    let kept = match scope {
+        McpScope::User => take_mcp_values(&host.agent_secrets, &mut map)?,
+        McpScope::Workspace => Kept::Store,
+    };
     let value = if map.is_empty() {
         serde_json::Value::Null
     } else {
-        serde_json::to_value(map).map_err(|e| IdeError::invalid(e.to_string()))?
+        serde_json::to_value(&map).map_err(|e| IdeError::invalid(e.to_string()))?
     };
     let event = IdeEvent::SettingsChanged { key: "agents.mcpServers".into() };
     match scope {
@@ -370,6 +445,9 @@ fn persist_mcp_map(
             for p in host.projects() {
                 p.settings.reload();
                 p.sink.emit(event.clone());
+                if kept == Kept::LocalFile {
+                    host.agent_secrets.notify_kept_locally(&p.sink);
+                }
             }
         }
         McpScope::Workspace => {
@@ -418,15 +496,17 @@ fn listed(
     ide_agent::mcp::servers_from_settings(user, &workspace)
 }
 
-/// The MCP servers agent sessions of the project at `root` get: the user's, and the project's the
-/// user turned on.
+/// The MCP servers agent sessions of the project at `root` get: the user's, values filled in, and
+/// the project's the user turned on.
 pub(crate) fn session_mcp_servers(
     settings: &ide_workspace::SettingsStore,
     approvals: &crate::trust::McpServerApprovals,
+    secrets: &AgentSecrets,
     root: &std::path::Path,
 ) -> Vec<McpServer> {
     use ide_workspace::settings::SettingsScope;
-    let user = settings.layer(SettingsScope::Global).agents.mcp_servers;
+    let mut user = settings.layer(SettingsScope::Global).agents.mcp_servers;
+    fill_mcp_values(secrets, &mut user);
     let workspace = approvals.apply(root, settings.layer(SettingsScope::Project).agents.mcp_servers);
     ide_agent::mcp::servers_from_settings(&user, &workspace)
 }
@@ -593,6 +673,7 @@ mod tests {
 
     #[test]
     fn sessions_get_the_users_servers_and_the_projects_turned_on_ones() {
+        ide_ssh::secrets::testing::use_memory_store();
         let tmp = tempfile::tempdir().unwrap();
         let (config, root) = (tmp.path().join("config"), tmp.path().join("project"));
         std::fs::create_dir_all(&config).unwrap();
@@ -605,6 +686,7 @@ mod tests {
         .unwrap();
         let settings = ide_workspace::SettingsStore::load(&config, Some(&root));
         let approvals = crate::trust::McpServerApprovals::load(&tmp.path().join("data"));
+        let secrets = AgentSecrets::new(&tmp.path().join("data"));
         let on = |servers: Vec<McpServer>| -> Vec<(McpScope, String, String)> {
             servers
                 .into_iter()
@@ -613,13 +695,27 @@ mod tests {
                 .collect()
         };
         assert_eq!(
-            on(session_mcp_servers(&settings, &approvals, &root)),
+            on(session_mcp_servers(&settings, &approvals, &secrets, &root)),
             [(McpScope::User, "shared".to_owned(), "user-cmd".to_owned())]
         );
 
+        // A user server's saved values reach the session; the file keeps only the names.
+        std::fs::write(
+            config.join("settings.toml"),
+            "[agents.mcpServers.keyed]\ncommand = \"k\"\nenv = { TOKEN = \"\" }\n",
+        )
+        .unwrap();
+        secrets.set("mcp/user/keyed/env/TOKEN", "saved-user").unwrap();
+        settings.reload();
+        let keyed = session_mcp_servers(&settings, &approvals, &secrets, &root);
+        let keyed = keyed.iter().find(|s| s.name == "keyed").unwrap();
+        assert_eq!(keyed.env[0].value, "saved-user");
+        std::fs::write(config.join("settings.toml"), "[agents.mcpServers.shared]\ncommand = \"user-cmd\"\n").unwrap();
+        settings.reload();
+
         let extra = settings.layer(ide_workspace::settings::SettingsScope::Project).agents.mcp_servers["extra"].clone();
         approvals.approve(&root, "extra", &extra).unwrap();
-        assert!(on(session_mcp_servers(&settings, &approvals, &root)).contains(&(
+        assert!(on(session_mcp_servers(&settings, &approvals, &secrets, &root)).contains(&(
             McpScope::Workspace,
             "extra".to_owned(),
             "extra".to_owned()

crates/ide-host/src/ops/build.rs

@@ -15,6 +15,7 @@ use ide_build::{BuildModel, BuildTool, SyncOptions, SyncProgress};
 use ide_core::settings::Settings;
 use ide_core::{DocId, FileEdit, IdeError, IdeEvent, IdeResult, Location, Pos, Range, RequestId, WorkspaceEdit};
 use std::path::Path;
+use std::sync::Arc;
 
 fn join_err(e: tokio::task::JoinError) -> IdeError {
     IdeError::internal(e.to_string())
@@ -330,21 +331,61 @@ pub async fn build_sync(
     // holds for Gradle: it reuses its cached classpath on restart, so a
     // dependency added to `build.gradle` stays unresolved until told to sync.
     let lsp = project.lsp.clone();
+    let documents = project.documents.clone();
     tokio::spawn(async move {
         if profiles_changed {
             // jdtls takes the profiles from its Maven settings (see `ide_sdk::maven_profiles`).
             lsp.reconfigure().await;
         }
+        let first = updates.first().cloned();
         for file in updates {
             let uri = ide_lsp::path_to_uri_string(&file);
             if let Err(e) = lsp.java_update_project_configs(&file, vec![uri]).await {
                 tracing::debug!("java/projectConfigurationsUpdate: {e}");
             }
         }
+        let changed = {
+            let lsp = lsp.clone();
+            tokio::task::spawn_blocking(move || lsp.changed_library_archives()).await.unwrap_or_default()
+        };
+        if let Some(file) = first
+            && let Err(e) = lsp.java_refresh_archives(&file, &changed).await
+        {
+            tracing::debug!("openidea.java.refreshArchives: {e}");
+        }
+        refresh_library_classes(&lsp, &documents).await;
     });
     Ok(model)
 }
 
+/// Open library classes whose jar was replaced in place (a SNAPSHOT installed
+/// again keeps its path) show the new contents, like a reopened one.
+async fn refresh_library_classes(lsp: &Arc<ide_lsp::LspManager>, documents: &Arc<ide_workspace::Documents>) {
+    let changed = {
+        let (lsp, documents) = (lsp.clone(), documents.clone());
+        tokio::task::spawn_blocking(move || {
+            documents
+                .open_documents()
+                .into_iter()
+                .filter_map(|doc| Some((doc, documents.virtual_uri(doc).ok().flatten()?)))
+                .filter(|(_, uri)| lsp.library_class_changed(uri))
+                .collect::<Vec<_>>()
+        })
+        .await
+        .unwrap_or_default()
+    };
+    for (doc, uri) in changed {
+        match lsp.virtual_document(&uri).await {
+            Ok(vd) => {
+                if let Err(e) = documents.replace_virtual(doc, &vd.text, &vd.encoding, vd.has_bom) {
+                    tracing::debug!("refreshing {uri}: {e}");
+                }
+            }
+            Err(e) => tracing::debug!("refreshing {uri}: {e}"),
+        }
+    }
+}
+
 /// The POM declaring `dependency` for the Maven module `pom` (project-relative): the
 /// module's own, else its nearest parent in the project; its path, text and declaration.
 fn declaring_pom(
@@ -1051,7 +1092,6 @@ mod maven_completion_tests {
     use ide_build::maven::completion::PomCompletionKind;
     use ide_core::CancellationToken;
     use ide_workspace::dependencies::DependencyVersionSource;
-    use std::sync::Arc;
 
     /// Cache answers the test plants before completing, so the op's Central
     /// lookups hit the session cache and the network is never reached.

crates/ide-host/src/ops/deploy.rs

@@ -188,8 +188,14 @@ pub async fn remote_download_into(
     r
 }
 
-pub async fn deploy_test_connection(state: &Host, connection: FsConnection, path: String) -> IdeResult<()> {
-    state.remote.test_connection(&connection, &path).await
+/// `password`: an FTP password typed in the settings but not applied yet.
+pub async fn deploy_test_connection(
+    state: &Host,
+    connection: FsConnection,
+    path: String,
+    password: Option<String>,
+) -> IdeResult<()> {
+    state.remote.test_connection_with(&connection, &path, password).await
 }
 
 pub(crate) fn register(d: &mut crate::rpc::Dispatcher) {
@@ -231,6 +237,6 @@ pub(crate) fn register(d: &mut crate::rpc::Dispatcher) {
         remote_rename(&c.host, c.arg("connection")?, c.arg("from")?, c.arg("to")?).await
     });
     d.add("deploy_test_connection", |c| async move {
-        deploy_test_connection(&c.host, c.arg("connection")?, c.arg("path")?).await
+        deploy_test_connection(&c.host, c.arg("connection")?, c.arg("path")?, c.arg("password")?).await
     });
 }

crates/ide-host/src/project.rs

@@ -675,9 +675,10 @@ impl Host {
             agents.set_new_task_approvals_hook(Arc::new(move || settings.effective().agents.new_task_approvals));
         }
         let approvals = self.mcp_approvals.clone();
+        let secrets = self.agent_secrets.clone();
         let root = root.to_path_buf();
         agents.set_mcp_servers_hook(Box::new(move || {
-            crate::ops::agent::session_mcp_servers(&settings, &approvals, &root)
+            crate::ops::agent::session_mcp_servers(&settings, &approvals, &secrets, &root)
         }));
         (db, http_history, agents)
     }

crates/ide-host/tests/mcp_secrets.rs

@@ -0,0 +1,133 @@
+//! Values of the user's MCP servers' environment variables and HTTP headers live in the
+//! credential store; `settings.toml` keeps only their names. A project's own servers keep
+//! their values in the project's file, where the project shares them.
+
+use ide_agent::{McpKeyValue, McpScope, McpServer, McpServerInput};
+use ide_core::NullSink;
+use ide_core::settings::McpTransport;
+use ide_host::{Host, HostConfig};
+use ide_ssh::secrets::testing::{files_containing, use_memory_store};
+use std::path::{Path, PathBuf};
+use std::sync::Arc;
+
+const VALUE: &str = "mcp-value-0f3c9a";
+
+fn host(dir: &Path) -> Arc<Host> {
+    Arc::new(Host::new(HostConfig {
+        config_dir: dir.join("config"),
+        data_dir: dir.join("data"),
+        local_data_dir: dir.join("data"),
+        languages: Arc::new(ide_language::LanguageRegistry::load(None).unwrap()),
+        syntax: Arc::default(),
+        sink_for: Box::new(|_| Arc::new(NullSink)),
+        owner: |w| w,
+        runtime: tokio::runtime::Handle::current(),
+        project_environment: false,
+    }))
+}
+
+fn project(tmp: &tempfile::TempDir) -> PathBuf {
+    let root = dunce::canonicalize(tmp.path()).unwrap().join("project");
+    std::fs::create_dir_all(root.join(".openidea")).unwrap();
+    root
+}
+
+fn open(host: &Host, root: &Path) {
+    host.trust.decide(root, true, false).unwrap();
+    host.open_project("main", root).unwrap();
+}
+
+fn header(servers: &[McpServer], id: &str) -> String {
+    let server = servers.iter().find(|s| s.id == id).unwrap_or_else(|| panic!("{id} in {servers:?}"));
+    server.headers.iter().find(|h| h.name == "Authorization").map(|h| h.value.clone()).unwrap_or_default()
+}
+
+fn input(name: &str, scope: McpScope) -> McpServerInput {
+    McpServerInput {
+        id: None,
+        name: name.into(),
+        scope,
+        transport: McpTransport::Http,
+        enabled: true,
+        command: None,
+        args: vec![],
+        env: vec![],
+        url: Some("https://mcp.example/v1".into()),
+        headers: vec![McpKeyValue { name: "Authorization".into(), value: format!("Bearer {VALUE}") }],
+        agents: vec![],
+    }
+}
+
+const SERVER_WITH_VALUE: &str = r#"
+[agents.mcpServers.remote]
+transport = "http"
+enabled = true
+url = "https://mcp.example/v1"
+headers = { Authorization = "Bearer mcp-value-0f3c9a" }
+"#;
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn user_server_values_stay_out_of_the_user_settings() {
+    use_memory_store();
+    let tmp = tempfile::tempdir().unwrap();
+    let root = project(&tmp);
+    let host = host(tmp.path());
+    open(&host, &root);
+    for (name, scope) in [("user-server", McpScope::User), ("repo-server", McpScope::Workspace)] {
+        ide_host::ops::agent::mcp_save(&host, "main", input(name, scope)).unwrap();
+    }
+    host.close_project("main");
+
+    // Only the project's own file holds a value; nothing in the user's config or data does.
+    let found = files_containing(tmp.path(), VALUE);
+    assert!(found.len() == 1 && found[0].ends_with(Path::new(".openidea/settings.toml")), "{found:?}");
+
+    let host = self::host(tmp.path());
+    open(&host, &root);
+    let servers = ide_host::ops::agent::mcp_list(&host, "main").unwrap();
+    assert_eq!(header(&servers, "user::user-server"), format!("Bearer {VALUE}"));
+    assert_eq!(header(&servers, "workspace::repo-server"), format!("Bearer {VALUE}"));
+    host.close_project("main");
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn values_in_user_settings_move_to_the_credential_store() {
+    use_memory_store();
+    let tmp = tempfile::tempdir().unwrap();
+    let root = project(&tmp);
+    std::fs::create_dir_all(tmp.path().join("config")).unwrap();
+    let saved = SERVER_WITH_VALUE.replace("Authorization =", "X-Saved = \"\", Authorization =");
+    std::fs::write(tmp.path().join("config/settings.toml"), saved).unwrap();
+    ide_host::agent_secrets::AgentSecrets::new(&tmp.path().join("data"))
+        .set("mcp/user/remote/header/X-Saved", "saved-earlier")
+        .unwrap();
+    let host = host(tmp.path());
+    assert_eq!(files_containing(tmp.path(), VALUE), Vec::<PathBuf>::new());
+    open(&host, &root);
+    let servers = ide_host::ops::agent::mcp_list(&host, "main").unwrap();
+    assert_eq!(header(&servers, "user::remote"), format!("Bearer {VALUE}"));
+    let remote = servers.iter().find(|s| s.id == "user::remote").unwrap();
+    assert!(remote.headers.iter().any(|h| h.name == "X-Saved" && h.value == "saved-earlier"), "{remote:?}");
+    host.close_project("main");
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn a_projects_own_values_stay_in_its_file() {
+    use_memory_store();
+    let tmp = tempfile::tempdir().unwrap();
+    let root = project(&tmp);
+    let file = root.join(".openidea/settings.toml");
+    std::fs::write(&file, SERVER_WITH_VALUE).unwrap();
+    let host = host(tmp.path());
+    open(&host, &root);
+    let servers = ide_host::ops::agent::mcp_list(&host, "main").unwrap();
+    assert_eq!(header(&servers, "workspace::remote"), format!("Bearer {VALUE}"));
+    assert_eq!(std::fs::read_to_string(&file).unwrap(), SERVER_WITH_VALUE, "reading leaves the project file alone");
+
+    // Saving the servers keeps the project's values in the project's file for everyone else.
+    let servers = ide_host::ops::agent::mcp_set_enabled(&host, "main", "workspace::remote".into(), false).unwrap();
+    assert_eq!(header(&servers, "workspace::remote"), format!("Bearer {VALUE}"));
+    assert!(std::fs::read_to_string(&file).unwrap().contains(VALUE));
+    assert_eq!(files_containing(&tmp.path().join("data"), VALUE), Vec::<PathBuf>::new());
+    host.close_project("main");
+}

crates/ide-host/tests/plugins.rs

@@ -2609,6 +2609,82 @@ fn git_toolbox_does_not_fetch_untrusted_projects() {
     assert!(err.contains("Restricted Mode"), "{err}");
 }
 
+/// Git Toolbox in a workspace window whose container folder is not a
+/// repository (every member is its own clone): the status bar follows the
+/// focused file's repository, and the scheduled fetch covers every member.
+#[test]
+fn official_git_toolbox_follows_members_in_a_workspace() {
+    let f = fixture(Limits { idle_timeout: Some(Duration::from_millis(50)), ..Limits::default() });
+    let tmp = tempfile::tempdir().unwrap();
+    // A remote with `main`, cloned by member `a` (at `main`) and member `b`
+    // (on its own branch, to tell the two apart in the status bar).
+    let remote = tmp.path().join("remote.git");
+    std::fs::create_dir(&remote).unwrap();
+    git(&remote, &["init", "--bare", "-b", "main"]);
+    let seed = tmp.path().join("seed");
+    std::fs::create_dir(&seed).unwrap();
+    git(&seed, &["init", "-b", "main"]);
+    std::fs::write(seed.join("seed.txt"), "seed\n").unwrap();
+    git(&seed, &["add", "."]);
+    git(&seed, &["commit", "-m", "one"]);
+    git(&seed, &["remote", "add", "origin", remote.to_str().unwrap()]);
+    git(&seed, &["push", "-u", "origin", "main"]);
+    let member_a = tmp.path().join("member-a");
+    git(tmp.path(), &["clone", remote.to_str().unwrap(), member_a.to_str().unwrap()]);
+    let member_a = dunce::canonicalize(member_a).unwrap();
+    let member_b = tmp.path().join("member-b");
+    git(tmp.path(), &["clone", remote.to_str().unwrap(), member_b.to_str().unwrap()]);
+    let member_b = dunce::canonicalize(member_b).unwrap();
+    git(&member_b, &["checkout", "-b", "feature"]);
+    git(&member_b, &["push", "-u", "origin", "feature"]);
+    // The window's project is the container; the members are attached to it.
+    f.workspace.other_roots.lock().extend([member_a.clone(), member_b.clone()]);
+
+    f.install(&official("git-toolbox"));
+    let item = |host: &PluginHost| {
+        host.status_items().into_iter().find(|(p, id, _)| p == "openidea.git-toolbox" && id == "branch")
+    };
+    let now = Instant::now();
+    let focus = |path: &Path| {
+        f.host
+            .post_events(Some("main"), vec![WorkbenchEvent::EditorFocused(Some(path.to_string_lossy().into_owned()))]);
+        f.host.flush_events_at(now + Duration::from_secs(3));
+        f.host.wait_events(Duration::from_secs(10));
+    };
+    // Focusing a file of member `a` shows that member's branch: the window's
+    // project is the container, which is no repository.
+    focus(&member_a.join("seed.txt"));
+    assert_eq!(item(&f.host).map(|(_, _, i)| i.text), Some("main".into()));
+    // Fetch Now fetches the shown member; the container is not a repository.
+    f.run("openidea.git-toolbox", "fetch", None).unwrap();
+    let fetched = stored(&f, "openidea.git-toolbox");
+    assert!(
+        fetched.iter().any(|(key, _)| key == &format!("last-fetch:{}", to_ipc(&member_a))),
+        "{member_a:?}: {fetched:?}"
+    );
+    assert_eq!(fetched.iter().filter(|(key, _)| key.starts_with("last-fetch:")).count(), 1, "{fetched:?}");
+    // Switching to the other member follows it.
+    focus(&member_b.join("seed.txt"));
+    assert_eq!(item(&f.host).map(|(_, _, i)| i.text), Some("feature".into()));
+
+    // Idle: reclaimed; the schedule then wakes it to fetch every member (the
+    // container is skipped: it has no repository).
+    std::thread::sleep(Duration::from_millis(100));
+    f.host.tick();
+    assert_eq!(item(&f.host).map(|(_, _, i)| i.text), Some("feature".into()), "the item stays while it sleeps");
+    f.take_events();
+    f.host.tick_at(Instant::now() + Duration::from_secs(301));
+    assert!(f.host.wait_events(Duration::from_secs(30)));
+    let fetched = stored(&f, "openidea.git-toolbox");
+    for member in [&member_a, &member_b] {
+        assert!(
+            fetched.iter().any(|(key, _)| key == &format!("last-fetch:{}", to_ipc(member))),
+            "{member:?}: {fetched:?}"
+        );
+    }
+    assert_eq!(item(&f.host).map(|(_, _, i)| i.text), Some("feature".into()));
+}
+
 /// A tiny HTTP server: each request is answered after `delay(n)` (n counts
 /// requests) with `body`. Returns its port and the request bodies it got.
 fn http_server(

crates/ide-host/tests/trust.rs

@@ -183,7 +183,7 @@ async fn welcome_window_browses_selected_ssh_host_without_executing_commands() {
     host.remote.test_connection(&connection, "/projects").await.unwrap();
     let local = tmp.path().join("local-deployment");
     std::fs::create_dir(&local).unwrap();
-    ide_host::ops::deploy::deploy_test_connection(&host, FsConnection::Local, local.to_str().unwrap().into())
+    ide_host::ops::deploy::deploy_test_connection(&host, FsConnection::Local, local.to_str().unwrap().into(), None)
         .await
         .unwrap();
     assert_eq!(std::fs::read_dir(local).unwrap().count(), 0, "write probe is cleaned up");

crates/ide-lsp/src/jdtls.rs

@@ -809,6 +809,21 @@ impl LspManager {
             .map_err(|e| crate::rpc_err(&server.name, "java/projectConfigurationsUpdate", e))
     }
 
+    /// Asks jdtls to re-read library archives replaced in place (`openidea.java.refreshArchives`):
+    /// a SNAPSHOT installed again keeps its path, and JDT would keep showing the classes it read
+    /// from the old archive. Best-effort: skipped while jdtls is not already running.
+    pub async fn java_refresh_archives(&self, path: &Path, archives: &[PathBuf]) -> IdeResult<()> {
+        let java = LanguageId::new("java");
+        let Some(server) = self.servers_for(&java, path).into_iter().find(|s| s.name == SERVER) else {
+            return Ok(());
+        };
+        if server.running().is_none() {
+            return Ok(());
+        }
+        let archives = archives.iter().map(|a| Value::String(a.to_string_lossy().into_owned())).collect();
+        self.jdtls_command(path, "openidea.java.refreshArchives", archives).await.map(|_| ())
+    }
+
     /// Pause autobuild before resolving the launch classpath. That query takes the
     /// Java project's workspace scheduling rule, draining the interrupted autobuild.
     /// Keep this guard until Maven outputs have been copied out of JDT's reach.

crates/ide-lsp/src/lib.rs

@@ -241,6 +241,9 @@ pub struct LspManager {
     virtual_origins: Mutex<HashMap<String, ide_core::ServerId>>,
     /// Contents fetched for virtual URIs.
     virtual_docs: Mutex<HashMap<String, VirtualDocument>>,
+    /// Modification time of the archive behind a cached library class, so a jar
+    /// replaced in place (a SNAPSHOT installed again) is read again.
+    virtual_stamps: Mutex<HashMap<String, std::time::SystemTime>>,
     injections: injections::State,
     /// Open notebooks by path. Locked before `docs` when both are.
     notebooks: Mutex<HashMap<PathBuf, notebook::NotebookState>>,
@@ -508,6 +511,7 @@ impl LspManager {
             go_mod_checked: Mutex::new(HashSet::new()),
             virtual_origins: Mutex::new(HashMap::new()),
             virtual_docs: Mutex::new(HashMap::new()),
+            virtual_stamps: Mutex::new(HashMap::new()),
             injections: injections::State::default(),
             notebooks: Mutex::new(HashMap::new()),
         })
@@ -3202,14 +3206,44 @@ impl LspManager {
         Ok(found)
     }
 
+    /// Whether the archive behind a cached library class changed since it was read.
+    /// Stats the archive: call from a blocking worker.
+    pub fn library_class_changed(&self, uri: &str) -> bool {
+        let Some(stamp) = self.virtual_stamps.lock().get(uri).copied() else { return false };
+        virtual_doc::archive_modified(uri) != Some(stamp)
+    }
+
+    /// Archives behind cached library classes that changed since they were read.
+    /// Stats each archive: call from a blocking worker.
+    pub fn changed_library_archives(&self) -> Vec<PathBuf> {
+        let uris: Vec<String> = self.virtual_stamps.lock().keys().cloned().collect();
+        let mut archives: Vec<PathBuf> = uris
+            .iter()
+            .filter(|uri| self.library_class_changed(uri))
+            .filter_map(|uri| virtual_doc::archive(uri))
+            .collect();
+        archives.sort();
+        archives.dedup();
+        archives
+    }
+
     /// Contents of a virtual document, from the server that owns `uri`:
     /// `workspace/textDocumentContent` (LSP 3.18) when the server serves the
     /// scheme, jdtls' `java/classFileContents` for `jdt:` URIs. A `jar:` entry
     /// is read from its archive, a `jar:` class shown as its library source
     /// (see [`library_source`]) or else decompiled by the server. Cached.
     pub async fn virtual_document(&self, uri: &str) -> IdeResult<VirtualDocument> {
-        if let Some(d) = self.virtual_docs.lock().get(uri) {
-            return Ok(d.clone());
+        let cached = self.virtual_docs.lock().get(uri).cloned();
+        if let Some(d) = cached {
+            let stamp = self.virtual_stamps.lock().get(uri).copied();
+            let current = {
+                let uri = uri.to_owned();
+                tokio::task::spawn_blocking(move || virtual_doc::archive_modified(&uri)).await.ok().flatten()
+            };
+            if stamp.is_none() || stamp == current {
+                return Ok(d);
+            }
+            self.virtual_docs.lock().remove(uri);
         }
         let scheme = virtual_doc::scheme(uri).to_owned();
         let jar_class = scheme == "jar" && library_source::parse(uri).is_some_and(|e| e.entry.ends_with(".class"));
@@ -3353,11 +3387,18 @@ impl LspManager {
         if let Some(server) = server {
             self.virtual_origins.lock().entry(uri.to_owned()).or_insert(server);
         }
+        let stamp = virtual_doc::archive_modified(uri);
         let mut cache = self.virtual_docs.lock();
+        let mut stamps = self.virtual_stamps.lock();
         if cache.len() >= VIRTUAL_CACHE_LIMIT {
             cache.clear();
+            stamps.clear();
         }
         cache.insert(uri.to_owned(), doc.clone());
+        match stamp {
+            Some(stamp) => stamps.insert(uri.to_owned(), stamp),
+            None => stamps.remove(uri),
+        };
         doc
     }
 

crates/ide-lsp/src/virtual_doc.rs

@@ -172,6 +172,20 @@ pub fn description(uri: &str) -> Option<String> {
     }
 }
 
+/// The archive a `jar:` or `jdt:` library class comes from.
+pub(crate) fn archive(uri: &str) -> Option<std::path::PathBuf> {
+    match scheme(uri) {
+        "jar" => Some(crate::library_source::parse(uri)?.jar),
+        "jdt" => description(uri).filter(|p| p.ends_with(".jar") || p.ends_with(".jmod")).map(Into::into),
+        _ => None,
+    }
+}
+
+/// Modification time of the archive a `jar:` or `jdt:` library class comes from.
+pub(crate) fn archive_modified(uri: &str) -> Option<std::time::SystemTime> {
+    std::fs::metadata(archive(uri)?).and_then(|m| m.modified()).ok()
+}
+
 /// Check both the package and actual archive, so duplicate type names never pick another jar.
 pub(crate) fn matches_class(uri: &str, jar: &std::path::Path, package: &str, name: &str) -> bool {
     let segs = segments(uri);
@@ -304,6 +318,29 @@ mod tests {
         assert_eq!(description("foo://x/y"), None);
     }
 
+    #[test]
+    fn finds_the_archive_behind_a_library_class() {
+        assert_eq!(archive(JDT), Some("/Users/me/.m2/repository/spring-boot-4.1.1.jar".into()));
+        assert_eq!(
+            archive("jdt://contents/java.base/java.lang/String.class?=p/%5C/jdk%5C/lib%5C/jrt-fs.jar%60java.base=x"),
+            None
+        );
+        assert_eq!(archive("jdt://contents/a.jar/p/C.class"), None);
+        assert_eq!(archive("file:///a/C.java"), None);
+
+        let dir = tempfile::tempdir().unwrap();
+        let jar = dir.path().join("lib-1.0-SNAPSHOT.jar");
+        std::fs::write(&jar, b"PK").unwrap();
+        let uri = format!("jar:file://{}!/p/C.class", jar.display());
+        assert_eq!(archive(&uri), Some(jar.clone()));
+        let before = archive_modified(&uri).unwrap();
+        let file = std::fs::File::options().write(true).open(&jar).unwrap();
+        file.set_modified(before + std::time::Duration::from_secs(5)).unwrap();
+        assert_ne!(archive_modified(&uri), Some(before));
+        std::fs::remove_file(&jar).unwrap();
+        assert_eq!(archive_modified(&uri), None);
+    }
+
     #[test]
     fn detects_generated_code() {
         assert!(is_decompiled(

crates/ide-remote/src/service.rs

@@ -80,6 +80,11 @@ impl RemoteService {
     }
 
     async fn fs(&self, connection: &FsConnection) -> IdeResult<RemoteFs> {
+        self.fs_with(connection, None).await
+    }
+
+    /// Like [`Self::fs`], with an FTP password typed but not saved yet (`None`: the saved one).
+    async fn fs_with(&self, connection: &FsConnection, password: Option<String>) -> IdeResult<RemoteFs> {
         match connection {
             FsConnection::Local => Ok(RemoteFs::Local),
             FsConnection::Sftp { ssh } => {
@@ -90,14 +95,24 @@ impl RemoteService {
                 Ok(RemoteFs::new(session.sftp().await?).with_shell(session))
             }
             FsConnection::Ftp { server, secure, ftp } => {
-                let password = self.ssh.password(&ide_ssh::ftp::secret_key(server));
+                let password = password.or_else(|| self.ssh.password(&ide_ssh::ftp::secret_key(server)));
                 Ok(RemoteFs::Ftp(ide_ssh::ftp::FtpFs::connect(ftp, *secure, password).await?))
             }
         }
     }
 
     pub async fn test_connection(&self, connection: &FsConnection, path: &str) -> IdeResult<()> {
-        let fs = self.fs(connection).await?;
+        self.test_connection_with(connection, path, None).await
+    }
+
+    /// Tests `connection` with an FTP password the settings have not saved yet.
+    pub async fn test_connection_with(
+        &self,
+        connection: &FsConnection,
+        path: &str,
+        password: Option<String>,
+    ) -> IdeResult<()> {
+        let fs = self.fs_with(connection, password).await?;
         let result = fs.test(path).await;
         fs.close().await;
         result

crates/ide-sdk/src/apply.rs

@@ -377,6 +377,11 @@ fn gradle_run_jdk<'a>(
     })
 }
 
+/// The newest installed JDK that Gradle `gradle` runs on.
+fn newest_gradle_jdk(gradle: (u32, u32), installed: &[crate::java::Jdk]) -> Option<&crate::java::Jdk> {
+    installed.iter().filter(|jdk| gradle_supports_java(gradle, jdk.major)).max_by_key(|jdk| jdk.major)
+}
+
 /// Default environment shared by Gradle model builds and Run configurations.
 pub fn gradle_build_env(
     root: &Path,
@@ -493,7 +498,17 @@ pub fn configure_gradle_runtime(cfg: &mut LanguageServerConfig, root: &Path, bui
         .any(|f| build_dir.join(f).is_file());
     let env = if gradle_build {
         let command = gradle_command(root, build_dir, s);
-        gradle_build_env(root, build_dir, &command.to_string_lossy(), s, None)
+        let command = command.to_string_lossy();
+        let mut env = gradle_build_env(root, build_dir, &command, s, None);
+        // No Project JDK and no Java version the build declares: jdtls would import on its own
+        // runtime, which an older Gradle cannot run on. Use an installed JDK this Gradle supports.
+        if !env.contains_key("JAVA_HOME")
+            && let Some(gradle) = gradle_distribution_version(build_dir, &command)
+            && let Some(jdk) = newest_gradle_jdk(gradle, &crate::java::installed_jdks())
+        {
+            env.insert("JAVA_HOME".into(), jdk.home.to_string_lossy().into_owned());
+        }
+        env
     } else {
         gradle_env(root, s, Default::default())
     };
@@ -2028,6 +2043,11 @@ mod gradle_runtime_tests {
         assert_eq!(gradle_run_jdk(Some(21), None, &installed, None).unwrap().major, 21);
         assert_eq!(gradle_run_jdk(Some(19), None, &installed, None).unwrap().major, 21);
         assert!(gradle_run_jdk(None, None, &installed, None).is_none());
+        // The Java import of a build that declares no Java version still needs a JVM its Gradle runs on.
+        assert_eq!(newest_gradle_jdk((8, 4), &installed).unwrap().major, 17);
+        assert_eq!(newest_gradle_jdk((7, 2), &installed).unwrap().major, 11);
+        assert_eq!(newest_gradle_jdk((9, 1), &installed).unwrap().major, 25);
+        assert!(newest_gradle_jdk((9, 0), &installed[4..]).is_none());
     }
 
     #[test]

crates/ide-sdk/src/java.rs

@@ -1547,7 +1547,7 @@ pub fn usages_bundle(data_dir: &Path) -> Option<PathBuf> {
     install_bundle(
         data_dir,
         "java-usages",
-        "1.13.0",
+        "1.14.0",
         include_bytes!("../../../java/java-usages/openidea-java-usages.jar"),
     )
 }

crates/ide-ssh/src/manager.rs

@@ -110,6 +110,11 @@ impl SshManager {
         self.entered.lock().get(key).cloned().or_else(|| self.saved.get(key))
     }
 
+    /// Whether a password is saved under `key` (not one only entered this session).
+    pub fn password_saved(&self, key: &str) -> bool {
+        self.saved.get(key).is_some()
+    }
+
     /// The known password / passphrase of configuration `id`.
     pub fn secret(&self, config: &SshConfiguration) -> Option<String> {
         if let Some(s) = self.entered.lock().get(&config.id) {

e2e/agentMarkdown.spec.ts

@@ -71,7 +71,14 @@ async function openReply(page: Page, text: string, imageData?: string, theme?: "
           [
             task.id,
             [
-              { type: "user", text: "Show Markdown", attachments: [], sentMs: 0, doneMs: 1, steered: false },
+              {
+                type: "user",
+                text: "Show Markdown",
+                attachments: [],
+                sentMs: 0,
+                doneMs: 1,
+                steered: false,
+              },
               { type: "agent", text },
             ],
           ],
@@ -111,7 +118,11 @@ test("scrolls a wide table inside the reply", async ({ page }) => {
   const reply = await openReply(page, REPLY);
   const sizes = await reply.evaluate((el) => {
     const table = el.querySelector("table")!;
-    return { reply: el.clientWidth, table: table.clientWidth, content: table.scrollWidth };
+    return {
+      reply: el.clientWidth,
+      table: table.clientWidth,
+      content: table.scrollWidth,
+    };
   });
   expect(sizes.table).toBeLessThanOrEqual(sizes.reply);
   expect(sizes.content).toBeGreaterThan(sizes.table);
@@ -148,7 +159,10 @@ test("loads local reply images, and web ones when asked", async ({ page }) => {
   let fetched = 0;
   await page.route("https://images.example.com/code.gif", (route) => {
     fetched++;
-    return route.fulfill({ contentType: "image/gif", body: Buffer.from(PIXEL.split(",")[1]!, "base64") });
+    return route.fulfill({
+      contentType: "image/gif",
+      body: Buffer.from(PIXEL.split(",")[1]!, "base64"),
+    });
   });
   const reply = await openReply(
     page,
@@ -158,7 +172,9 @@ test("loads local reply images, and web ones when asked", async ({ page }) => {
   const width = (name: string) =>
     reply.getByRole("img", { name, includeHidden: true }).evaluate((img: HTMLImageElement) => img.naturalWidth);
   await expect.poll(() => width("Local QR")).toBe(1);
-  const load = reply.getByRole("button", { name: "Load image from images.example.com" });
+  const load = reply.getByRole("button", {
+    name: "Load image from images.example.com",
+  });
   await expect(load).toBeVisible();
   expect(fetched).toBe(0);
   await load.click();
@@ -203,12 +219,10 @@ test("keeps latest reply actions visible and quotes into the draft without shift
   await page.getByRole("button", { name: "Quote Reply", exact: true }).click();
   const draft = page.getByRole("textbox", { name: "Message", exact: true });
   await expect(draft).toBeFocused();
-  await expect(draft).toHaveValue(
-    REPLY.trimEnd()
-      .split("\n")
-      .map((line) => (line ? `> ${line}` : ">"))
-      .join("\n") + "\n\n",
-  );
+  // Quoted as `> ` lines, drawn as a block without their markers, an empty line to type in after it.
+  const quoted = REPLY.trimEnd().split("\n");
+  await expect(draft.locator(".cm-line")).toHaveText([...quoted, "", ""]);
+  await expect(draft.locator(".cm-line[class*='_quoteLine_']")).toHaveCount(quoted.length);
 });
 
 test("copies a mouse selection with Ctrl+C and pops up no Quote button", async ({ page, context }) => {
@@ -231,7 +245,14 @@ test("keeps chat history readable and selections free of timestamps and status l
   await page.evaluate(async (task) => {
     const path = "/src/features/agents/store.ts";
     const store = await import(path);
-    const user = (text: string) => ({ type: "user", text, attachments: [], sentMs: 1, doneMs: 5001, steered: false });
+    const user = (text: string) => ({
+      type: "user",
+      text,
+      attachments: [],
+      sentMs: 1,
+      doneMs: 5001,
+      steered: false,
+    });
     store.useAgents.setState({
       entries: new Map([
         [
@@ -326,7 +347,9 @@ test("keeps hover actions reachable when the pointer leaves the message body", a
   const copy = page.getByRole("button", { name: "Copy Markdown", exact: true });
   await reply.hover();
   const box = await copy.boundingBox();
-  await page.mouse.move(box!.x + box!.width / 2, box!.y + box!.height / 2, { steps: 20 });
+  await page.mouse.move(box!.x + box!.width / 2, box!.y + box!.height / 2, {
+    steps: 20,
+  });
   await expect(copy.locator("..")).toHaveCSS("opacity", "1");
   await copy.click();
   expect(await page.evaluate(() => navigator.clipboard.readText())).toBe("A short answer.");
@@ -468,7 +491,10 @@ for (const theme of ["dark", "light"] as const) {
           const bar = document.getElementById(el.id.replace(/-text$/, ""))!;
           const fg = luminance(getComputedStyle(el).fill);
           const bg = luminance(getComputedStyle(bar).fill);
-          return { text: el.textContent, ratio: (Math.max(fg, bg) + 0.05) / (Math.min(fg, bg) + 0.05) };
+          return {
+            text: el.textContent,
+            ratio: (Math.max(fg, bg) + 0.05) / (Math.min(fg, bg) + 0.05),
+          };
         });
       });
     expect(contrasts).toHaveLength(4);
@@ -480,7 +506,10 @@ test("draws a diagram without reaching the hosts its configuration names", async
   const asked: string[] = [];
   await page.route(/^https:\/\/([a-z\d-]+\.)*example\.com\//, (route) => {
     asked.push(new URL(route.request().url()).pathname);
-    return route.fulfill({ contentType: "image/gif", body: Buffer.from(PIXEL.split(",")[1]!, "base64") });
+    return route.fulfill({
+      contentType: "image/gif",
+      body: Buffer.from(PIXEL.split(",")[1]!, "base64"),
+    });
   });
   const at = (name: string) => `https://images.example.com/${name}`;
   const fence = (...lines: string[]) => ["```mermaid", ...lines, "```"].join("\n");

e2e/mergeEditor.spec.ts

@@ -122,6 +122,23 @@ test("Apply writes and stages unresolved text only after confirmation", async ({
   expect((await writes(page))[0]!.args[2]).toEqual({ changes: [{ from: 0, to: 13, insert: BASE }] });
 });
 
+test("footer buttons work when a click doesn't focus them, as in WebKit", async ({ page }) => {
+  await mountMerge(page);
+  await result(page).locator(".cm-content").click();
+  // WebKit focuses the clicked button's nearest focusable ancestor, not the button.
+  await page
+    .locator("#merge-host")
+    .getByRole("button", { name: "Apply", exact: true })
+    .evaluate((button) => {
+      let target = button.parentElement;
+      while (target && !target.hasAttribute("tabindex")) target = target.parentElement;
+      if (target) target.focus();
+      else (document.activeElement as HTMLElement | null)?.blur();
+      (button as HTMLButtonElement).click();
+    });
+  await expect(page.getByRole("dialog")).toContainText("Save and mark the file as resolved anyway?");
+});
+
 test("binary and unreadable versions show an error with no Apply controls", async ({ page }) => {
   await mountMerge(page, ["\0base", "\0ours", "\0theirs"]);
   await expect(page.locator("#merge-host")).toContainText("Binary files cannot be resolved in the merge editor.");

java/java-usages/MANIFEST.MF

@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: OpenIDEA Java usages
 Bundle-SymbolicName: ai.openidea.usages;singleton:=true
-Bundle-Version: 1.13.0
+Bundle-Version: 1.14.0
 Bundle-RequiredExecutionEnvironment: JavaSE-21
 Require-Bundle: org.eclipse.jdt.ls.core,org.eclipse.jdt.core,
  org.eclipse.jdt.core.manipulation,org.eclipse.core.runtime,

java/java-usages/plugin.xml

@@ -17,6 +17,9 @@
     <delegateCommandHandler class="ai.openidea.implementations.ImplementationsCommand">
       <command id="openidea.java.implementations"/>
     </delegateCommandHandler>
+    <delegateCommandHandler class="ai.openidea.archives.RefreshArchivesCommand">
+      <command id="openidea.java.refreshArchives"/>
+    </delegateCommandHandler>
     <delegateCommandHandler class="ai.openidea.hierarchy.HierarchyCommand">
       <command id="openidea.java.hierarchy.members"/>
       <command id="openidea.java.hierarchy.refactor"/>

java/java-usages/src/ai/openidea/archives/RefreshArchivesCommand.java

@@ -0,0 +1,68 @@
+package ai.openidea.archives;
+
+import java.lang.reflect.Field;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import org.eclipse.core.resources.ResourcesPlugin;
+import org.eclipse.core.runtime.IPath;
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.core.runtime.OperationCanceledException;
+import org.eclipse.core.runtime.Path;
+import org.eclipse.jdt.core.IJavaModel;
+import org.eclipse.jdt.core.IJavaProject;
+import org.eclipse.jdt.core.IPackageFragmentRoot;
+import org.eclipse.jdt.core.JavaCore;
+import org.eclipse.jdt.ls.core.internal.IDelegateCommandHandler;
+import org.eclipse.jdt.ls.core.internal.JavaLanguageServerPlugin;
+
+/**
+ * Re-reads library archives replaced in place (a SNAPSHOT installed again keeps its path). The
+ * arguments are the archives' file system paths. Their package fragment roots are closed, which
+ * drops the class files read from the old archive, and jdtls' decompiled sources (cached by class
+ * handle, which a replaced archive keeps) are dropped, so the classes are read again.
+ */
+public final class RefreshArchivesCommand implements IDelegateCommandHandler {
+    @Override
+    public Object executeCommand(String command, List<Object> arguments, IProgressMonitor monitor) throws Exception {
+        IJavaModel model = JavaCore.create(ResourcesPlugin.getWorkspace().getRoot());
+        model.refreshExternalArchives(null, monitor);
+        Set<IPath> archives = new HashSet<>();
+        for (Object argument : arguments) {
+            if (argument instanceof String path) archives.add(Path.fromOSString(path));
+        }
+        int closed = 0;
+        if (archives.isEmpty()) return closed;
+        clearDecompilerCache();
+        for (IJavaProject project : model.getJavaProjects()) {
+            for (IPackageFragmentRoot root : project.getPackageFragmentRoots()) {
+                if (monitor.isCanceled()) throw new OperationCanceledException();
+                if (root.isArchive() && root.isExternal() && archives.contains(root.getPath()) && root.isOpen()) {
+                    root.close();
+                    closed++;
+                }
+            }
+        }
+        return closed;
+    }
+
+    /** jdtls keeps decompiled sources in a static per-decompiler LRU with no API to drop them. */
+    private static void clearDecompilerCache() {
+        try {
+            Class<?> impl = IDelegateCommandHandler.class.getClassLoader()
+                    .loadClass("org.eclipse.jdt.ls.core.internal.decompiler.DecompilerImpl");
+            Field field = impl.getDeclaredField("decompilerCache");
+            field.setAccessible(true);
+            if (field.get(null) instanceof Map<?, ?> caches) {
+                synchronized (caches) {
+                    for (Object cache : caches.values()) {
+                        if (cache instanceof Map<?, ?> map) map.clear();
+                    }
+                }
+            }
+        } catch (ReflectiveOperationException | RuntimeException e) {
+            JavaLanguageServerPlugin.logException("Clearing decompiled sources", e);
+        }
+    }
+}

plugins/official/git-toolbox/dist/plugin.wasm.sources

@@ -1 +1 @@
-63847067fc7b9931a3d697d8e6649cea04a0af7ad02d57e26a38f9acb2e6fcdd
+d6991b9065d8b623efdf9c03fb92b4875e95e666b3dadb3925ff5ad327f5fdcb

plugins/official/git-toolbox/src/lib.rs

@@ -1,6 +1,6 @@
 //! Git Toolbox for OpenIDEA: background fetch of every open project's
 //! repository (on the plugin's `on-schedule`, which also fires after the
-//! instance was reclaimed while idle), and the focused project's branch with
+//! instance was reclaimed while idle), and the focused file's branch with
 //! its ahead/behind counts in the status bar.
 
 use openidea_plugin::host::{self, storage};
@@ -14,7 +14,12 @@ const LAST_FETCH: &str = "last-fetch:";
 const SHOWN: &str = "shown-root";
 
 #[derive(Default)]
-pub struct GitToolbox;
+pub struct GitToolbox {
+    /// The focused editor's file path, from the last `editor-focused` event.
+    /// Kept across events: the status bar keeps following that file's
+    /// repository until another file takes focus.
+    focused: Option<String>,
+}
 
 fn now_secs() -> u64 {
     std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH).map(|d| d.as_secs()).unwrap_or(0)
@@ -67,31 +72,51 @@ fn tooltip(s: &RepositoryStatus) -> String {
     lines.join("\n")
 }
 
-/// Shows `project`'s repository in the status bar (or hides the item).
-fn show(project: &Project) -> Result<(), Error> {
-    match project.vcs_status()? {
-        Some(s) => {
+/// Shows the first of `projects` that has a repository in the status bar (the
+/// item hides when none has). Returns the index of the one shown.
+fn show(projects: &[Project]) -> Result<Option<usize>, Error> {
+    for (i, project) in projects.iter().enumerate() {
+        if let Some(s) = project.vcs_status()? {
             let _ = storage::set(SHOWN, &project.root()?);
             host::set_status_item(
                 ITEM,
                 &StatusItem { text: label(&s), tooltip: Some(tooltip(&s)), command: Some("fetch".into()) },
             );
+            return Ok(Some(i));
         }
-        None => host::remove_status_item(ITEM),
     }
-    Ok(())
+    host::remove_status_item(ITEM);
+    Ok(None)
 }
 
-/// The project the status bar follows: the invoking window's, else the one
-/// shown last, else the first open one.
-fn current(ctx: &Invocation) -> Option<Project> {
-    if let Some(p) = ctx.project() {
-        return Some(p);
+impl GitToolbox {
+    /// The projects the status bar may follow, most specific first: the
+    /// focused file's repository (a workspace window's project is the
+    /// container folder, and its focused files belong to member
+    /// repositories), the invoking window's, the one shown last, else the
+    /// first open one.
+    fn candidates(&self, ctx: &Invocation) -> Vec<Project> {
+        let mut out: Vec<Project> = Vec::new();
+        let editor = ctx.editor().map(|e| e.path());
+        let mut push = |project: Option<Project>| {
+            if let Some(p) = project
+                && let Ok(root) = p.root()
+                && out.iter().all(|q| q.root() != Ok(root.clone()))
+            {
+                out.push(p);
+            }
+        };
+        push(self.focused.as_deref().or(editor.as_deref()).and_then(host::project_of));
+        push(ctx.project());
+        let projects = host::projects().unwrap_or_default();
+        let shown = storage::get(SHOWN).ok().flatten();
+        let index = projects.iter().position(|p| p.root().ok().as_deref() == shown.as_deref()).unwrap_or(0);
+        let mut rest = projects;
+        if index < rest.len() {
+            push(Some(rest.swap_remove(index)));
+        }
+        out
     }
-    let projects = host::projects().ok()?;
-    let shown = storage::get(SHOWN).ok().flatten();
-    let index = projects.iter().position(|p| p.root().ok() == shown).unwrap_or(0);
-    projects.into_iter().nth(index)
 }
 
 /// Fetches `projects` in one cancellable task. Returns how many were fetched.
@@ -131,15 +156,22 @@ fn fetch(projects: &[Project]) -> Result<usize, Error> {
 
 impl Plugin for GitToolbox {
     fn run_command(&mut self, id: &str, ctx: &Invocation, _arg: Option<&str>) -> Result<Option<String>, Error> {
-        let project = current(ctx).ok_or("no project is open")?;
+        let projects = self.candidates(ctx);
+        if projects.is_empty() {
+            return Err("no project is open".into());
+        }
         match id {
             "fetch" => {
-                let n = fetch(std::slice::from_ref(&project))?;
-                show(&project)?;
+                // Only the repository the status bar shows, not every candidate.
+                let Some(i) = show(&projects)? else {
+                    return Ok(Some("The project is not in a git repository.".to_owned()));
+                };
+                let n = fetch(std::slice::from_ref(&projects[i]))?;
+                show(&projects)?;
                 Ok((n == 0).then(|| "The project is not in a git repository.".to_owned()))
             }
             "refresh" => {
-                show(&project)?;
+                show(&projects)?;
                 Ok(None)
             }
             _ => Err(Error::NotFound(format!("command {id}"))),
@@ -155,9 +187,12 @@ impl Plugin for GitToolbox {
                 host::notify(NotificationLevel::Warning, "Git Toolbox: fetch failed", &e.to_string());
             }
         }
-        if let Some(p) = current(ctx) {
-            let _ = show(&p);
+        for e in events {
+            if let Event::EditorFocused(Some(path)) = e {
+                self.focused = Some(path.clone());
+            }
         }
+        let _ = show(&self.candidates(ctx));
     }
 }
 
@@ -195,7 +230,7 @@ mod tests {
         let host = MockHost::install();
         host.add_project("/other");
         host.set_vcs_status(Some(status(0, 4)));
-        GitToolbox.handle_events(&[Event::Scheduled], &host.invocation());
+        GitToolbox::default().handle_events(&[Event::Scheduled], &host.invocation());
         assert_eq!(host.fetches(), 2, "every open project");
         let item = &host.status_items()["branch"];
         assert_eq!(item.text, "main ↓4");
@@ -208,26 +243,72 @@ mod tests {
     #[test]
     fn focus_changes_only_refresh() {
         let host = MockHost::install();
+        let mut plugin = GitToolbox::default();
         host.set_vcs_status(Some(status(1, 0)));
-        GitToolbox.handle_events(&[Event::EditorFocused(Some("/project/a.rs".into()))], &host.invocation());
+        plugin.handle_events(&[Event::EditorFocused(Some("/project/a.rs".into()))], &host.invocation());
         assert_eq!(host.fetches(), 0);
         assert_eq!(host.status_items()["branch"].text, "main ↑1");
         host.set_vcs_status(None);
-        GitToolbox.handle_events(&[Event::VcsChanged("/project".into())], &host.invocation());
+        plugin.handle_events(&[Event::VcsChanged("/project".into())], &host.invocation());
         assert!(host.status_items().is_empty(), "not a repository any more");
     }
 
+    /// A workspace window's project is the container folder, which is no
+    /// repository: the focused file's member repository is shown instead, and
+    /// follows the focus between members.
+    #[test]
+    fn workspace_windows_follow_the_focused_members_repository() {
+        let host = MockHost::install();
+        let mut plugin = GitToolbox::default();
+        host.set_project_root(Some("/workspace"));
+        host.add_project("/repos/a");
+        host.add_project("/repos/b");
+        host.set_vcs_status(Some(status(1, 2)));
+        plugin.handle_events(&[Event::EditorFocused(Some("/repos/a/src/main.rs".into()))], &host.invocation());
+        assert_eq!(host.storage()["shown-root"], "/repos/a", "the focused file's member, not the container");
+        assert_eq!(host.status_items()["branch"].text, "main ↑1 ↓2");
+        plugin.handle_events(&[Event::EditorFocused(Some("/repos/b/src/lib.rs".into()))], &host.invocation());
+        assert_eq!(host.storage()["shown-root"], "/repos/b", "the focus moved to the other member");
+        // A scheduled tick keeps following the focused member.
+        plugin.handle_events(&[Event::Scheduled], &host.invocation());
+        assert_eq!(host.storage()["shown-root"], "/repos/b");
+    }
+
+    /// Fetch Now fetches the repository the status bar shows, not every
+    /// other open project.
+    #[test]
+    fn fetch_now_fetches_only_the_shown_repository() {
+        let host = MockHost::install();
+        host.add_project("/other");
+        storage::set(SHOWN, "/other").unwrap();
+        host.set_vcs_status(Some(status(0, 0)));
+        GitToolbox::default().run_command("fetch", &host.invocation(), None).unwrap();
+        assert_eq!(host.fetches(), 1);
+        assert_eq!(host.storage()["shown-root"], "/project");
+    }
+
+    /// A focused path outside every open project falls back to the window's
+    /// project, whose repository is shown as before.
+    #[test]
+    fn an_unresolvable_focused_path_falls_back_to_the_window_project() {
+        let host = MockHost::install();
+        host.set_vcs_status(Some(status(0, 0)));
+        GitToolbox::default().handle_events(&[Event::EditorFocused(Some("src/main.rs".into()))], &host.invocation());
+        assert_eq!(host.storage()["shown-root"], "/project");
+        assert_eq!(host.status_items()["branch"].text, "main");
+    }
+
     #[test]
     fn failures_and_cancellation() {
         let host = MockHost::install();
         host.set_vcs_status(Some(status(0, 0)));
         host.fail_fetch(Some(Error::Failed("no network".into())));
-        GitToolbox.handle_events(&[Event::Scheduled], &host.invocation());
+        GitToolbox::default().handle_events(&[Event::Scheduled], &host.invocation());
         assert_eq!(host.notifications()[0].body, "no network");
-        let err = GitToolbox.run_command("fetch", &host.invocation(), None).unwrap_err();
+        let err = GitToolbox::default().run_command("fetch", &host.invocation(), None).unwrap_err();
         assert_eq!(err, Error::Failed("no network".into()));
         host.fail_fetch(Some(Error::Cancelled));
-        GitToolbox.handle_events(&[Event::Scheduled], &host.invocation());
+        GitToolbox::default().handle_events(&[Event::Scheduled], &host.invocation());
         assert_eq!(host.notifications().len(), 1, "a cancelled fetch is not an error to report");
     }
 
@@ -235,7 +316,7 @@ mod tests {
     fn without_vcs_write_it_still_shows_the_branch() {
         let host = MockHost::install().with_capabilities(&["project.read", "vcs.read", "storage"]);
         host.set_vcs_status(Some(status(0, 1)));
-        GitToolbox.handle_events(&[Event::Scheduled], &host.invocation());
+        GitToolbox::default().handle_events(&[Event::Scheduled], &host.invocation());
         assert!(host.notifications()[0].body.contains("vcs.write"));
         assert_eq!(host.status_items()["branch"].text, "main ↓1");
     }

src-tauri/src/commands/app.rs

@@ -189,22 +189,44 @@ pub fn settings_get_global(state: State<'_, AppState>) -> Settings {
 #[specta::specta]
 pub fn settings_set(
     window: Window,
-    state: State<'_, AppState>,
+    app: tauri::AppHandle,
     scope: SettingsScope,
     key: String,
     value: String,
 ) -> IdeResult<Settings> {
-    let applied = ide_host::ops::project::set_settings(&state.host, window.label(), scope, &key, &value)?;
+    let window = window.label().to_owned();
+    // The merge validates its result by deserializing the whole `Settings`, which needs
+    // ~250 KiB of stack in a debug build (measured by bisecting a thread's stack size; the
+    // same with and without a settings file, so it is the type, not the data). A WebView2
+    // IPC callback reaches this command with ~750 KiB of the main thread's 1 MiB already
+    // used, so the merge — and anything else called from that callback — can overflow it.
+    // A worker thread starts from a clean stack, where the default 2 MiB is ample.
+    std::thread::spawn(move || {
+        let state = app.state::<AppState>();
+        settings_set_now(&state, &window, scope, &key, &value)
+    })
+    .join()
+    .map_err(|_| IdeError::internal("settings worker panicked"))?
+}
+
+fn settings_set_now(
+    state: &AppState,
+    window: &str,
+    scope: SettingsScope,
+    key: &str,
+    value: &str,
+) -> IdeResult<Settings> {
+    let applied = ide_host::ops::project::set_settings(&state.host, window, scope, key, value)?;
     if key == "mcpServer" || key.starts_with("mcpServer.") {
-        crate::commands::mcp::apply(&state);
+        crate::commands::mcp::apply(state);
     }
     if !applied.project_scope {
         state.updates.wake.notify_one();
     }
     // A project value concerns only that project's window (and its settings window).
-    let event = ide_core::IdeEvent::SettingsChanged { key };
+    let event = ide_core::IdeEvent::SettingsChanged { key: key.to_owned() };
     if applied.project_scope {
-        let owner = AppState::owner_window(window.label());
+        let owner = AppState::owner_window(window);
         for label in [owner.to_owned(), crate::windows::settings_label(owner)] {
             let sink = crate::events::TauriSink { app: state.app.clone(), window: Some(label) };
             sink.emit(event.clone());
@@ -227,6 +249,7 @@ pub async fn settings_export(
     path: PathBuf,
     storage: std::collections::BTreeMap<String, String>,
 ) -> IdeResult<()> {
+    ide_host::ops::agent::move_user_mcp_values(&state.host);
     state.global_settings.export_bundle(&path, storage)
 }
 
@@ -244,6 +267,7 @@ pub struct SettingsImport {
 #[specta::specta]
 pub async fn settings_import(window: Window, state: State<'_, AppState>, path: PathBuf) -> IdeResult<SettingsImport> {
     let (_, storage) = state.global_settings.import_bundle(&path)?;
+    ide_host::ops::agent::move_user_mcp_values(&state.host);
     for project in state.projects() {
         let effective = project.settings.reload();
         project

src-tauri/src/commands/deploy.rs

@@ -158,6 +158,7 @@ pub async fn deploy_test_connection(
     state: State<'_, AppState>,
     connection: FsConnection,
     path: String,
+    password: Option<String>,
 ) -> IdeResult<()> {
-    ide_host::ops::deploy::deploy_test_connection(&state.host, connection, path).await
+    ide_host::ops::deploy::deploy_test_connection(&state.host, connection, path, password).await
 }

src-tauri/src/commands/mod.rs

@@ -676,6 +676,7 @@ pub fn builder() -> tauri_specta::Builder<tauri::Wry> {
         wsl::wsl_resolve,
         ssh::ssh_set_secret,
         ssh::ssh_needs_secret,
+        ssh::ssh_password_saved,
         ssh::ssh_trust_host,
         ssh::ssh_connected,
         ssh::ssh_disconnect,

src-tauri/src/commands/ssh.rs

@@ -27,6 +27,13 @@ pub fn ssh_set_secret(state: State<'_, AppState>, id: String, secret: Option<Str
     state.ssh.set_secret(&id, secret, save);
 }
 
+/// Whether a password is saved under `key` (an FTP deployment server's).
+#[tauri::command]
+#[specta::specta]
+pub fn ssh_password_saved(state: State<'_, AppState>, key: String) -> bool {
+    state.ssh.password_saved(&key)
+}
+
 /// Whether connecting with configuration `id` needs a password first.
 #[tauri::command]
 #[specta::specta]

src/bindings.ts

@@ -1594,6 +1594,8 @@ export const commands = {
 	sshSetSecret: (id: string, secret: string | null, save: boolean) => __TAURI_INVOKE<void>("ssh_set_secret", { id, secret, save }),
 	/**  Whether connecting with configuration `id` needs a password first. */
 	sshNeedsSecret: (id: string) => typedError<boolean, IdeError>(__TAURI_INVOKE("ssh_needs_secret", { id })),
+	/**  Whether a password is saved under `key` (an FTP deployment server's). */
+	sshPasswordSaved: (key: string) => __TAURI_INVOKE<boolean>("ssh_password_saved", { key }),
 	/**  Trusts the host key that failed the last connection of configuration `id`. */
 	sshTrustHost: (id: string) => typedError<null, IdeError>(__TAURI_INVOKE("ssh_trust_host", { id })),
 	/**  Ids of the configurations with an open connection. */
@@ -1623,7 +1625,7 @@ export const commands = {
 } | null, IdeError>(__TAURI_INVOKE("deploy_info", { path, server })),
 	deployServerRoot: (server: string) => typedError<DeploymentRoot, IdeError>(__TAURI_INVOKE("deploy_server_root", { server })),
 	remoteList: (connection: FsConnection, path: string) => typedError<RemoteEntry[], IdeError>(__TAURI_INVOKE("remote_list", { connection, path })),
-	deployTestConnection: (connection: FsConnection, path: string) => typedError<null, IdeError>(__TAURI_INVOKE("deploy_test_connection", { connection, path })),
+	deployTestConnection: (connection: FsConnection, path: string, password: string | null) => typedError<null, IdeError>(__TAURI_INVOKE("deploy_test_connection", { connection, path, password })),
 	remoteOpen: (connection: FsConnection, path: string) => typedError<IpcPath, IdeError>(__TAURI_INVOKE("remote_open", { connection, path })),
 	remoteOf: (path: IpcPath) => __TAURI_INVOKE<[FsConnection, string] | null>("remote_of", { path }),
 	remoteDelete: (connection: FsConnection, path: string) => typedError<null, IdeError>(__TAURI_INVOKE("remote_delete", { connection, path })),
@@ -2502,7 +2504,7 @@ export type AskpassKind =
 /**  Yes / no (an unknown host key); answered with `yes` or `no`. */
 "confirm";
 
-export type AttachKind = "java" | "node" | "python" | "go" | "native";
+export type AttachKind = "java" | "node" | "python" | "dotnet" | "go" | "native";
 
 export type AttachableProcess = {
 	pid: number,
@@ -9605,6 +9607,8 @@ export type SmartKeysSettings = {
 	pairQuotes?: boolean,
 	surroundSelection?: boolean,
 	tabOutOfPair?: boolean,
+	/**  Simultaneous `<tag></tag>` editing: renaming a tag renames its matching tag. */
+	simultaneousTagEditing?: boolean,
 	/**  Reformat on paste: `none` | `indentBlock` | `indentEachLine`. */
 	reformatOnPaste?: string,
 	escapeOnPaste?: boolean,

src/editor/core/busyClose.test.ts

@@ -0,0 +1,168 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+import { registerEditorKind, type EditorKindContribution } from "@/workbench/contributions";
+import { t } from "@/platform/i18n";
+import { useProject } from "@/platform/project";
+import { confirm } from "@/workbench/messages";
+import type * as Messages from "@/workbench/messages";
+import { EditorController, useTabs } from "./controller";
+import { createMemoryBackend } from "./backend";
+import { initialTabsState } from "./model/tabs";
+
+vi.mock("@/workbench/messages", async (original) => ({
+  ...(await original<typeof Messages>()),
+  confirm: vi.fn(),
+}));
+
+let controller: EditorController | null = null;
+afterEach(() => {
+  controller?.stop();
+  controller = null;
+  useTabs.setState(initialTabsState(), true);
+  useProject.setState({ project: null, settings: null });
+  vi.mocked(confirm).mockReset();
+});
+
+/** A kind whose tabs answer `isBusy`; the title is the input key. */
+const busyKind = (isBusy: EditorKindContribution["isBusy"]) =>
+  registerEditorKind({ kind: "busy-probe", title: (i) => i.key, component: () => null, isBusy });
+
+const start = () => {
+  controller = new EditorController(createMemoryBackend({}));
+  controller.start();
+  return controller;
+};
+const pane = () => useTabs.getState().panes[useTabs.getState().activePane]!;
+const keys = () => pane().tabs.map((tab) => tab.input.key);
+const question = (name: string) => ({
+  title: t("editor.closeBusy.title", { name }),
+  message: t("editor.closeBusy.message", { name }),
+  ok: t("editor.closeBusy.terminate"),
+});
+
+describe("editor kinds' isBusy on close", () => {
+  it("asks before closing a busy tab and keeps it on Cancel", async () => {
+    const dispose = busyKind(() => true);
+    vi.mocked(confirm).mockResolvedValue(false);
+    const ctrl = start();
+    try {
+      await ctrl.openInput({ kind: "busy-probe", key: "busy-probe:1" });
+      expect(await ctrl.closeTab(pane().id, pane().tabs[0]!.id)).toBe(false);
+      expect(confirm).toHaveBeenCalledExactlyOnceWith(question("busy-probe:1"));
+      expect(keys()).toEqual(["busy-probe:1"]);
+    } finally {
+      dispose();
+    }
+  });
+
+  it("closes the busy tab once terminating is confirmed", async () => {
+    const closed = vi.fn();
+    const dispose = registerEditorKind({
+      kind: "busy-probe",
+      title: (i) => i.key,
+      component: () => null,
+      isBusy: () => true,
+      onClose: closed,
+    });
+    vi.mocked(confirm).mockResolvedValue(true);
+    const ctrl = start();
+    const input = { kind: "busy-probe", key: "busy-probe:1" };
+    try {
+      await ctrl.openInput(input);
+      expect(await ctrl.closeTab(pane().id, pane().tabs[0]!.id)).toBe(true);
+      expect(keys()).toEqual([]);
+      expect(closed).toHaveBeenCalledExactlyOnceWith(input);
+    } finally {
+      dispose();
+    }
+  });
+
+  it("awaits an async answer, and closes a tab that is not busy without asking", async () => {
+    const dispose = busyKind(async (i) => i.key === "busy-probe:1");
+    vi.mocked(confirm).mockResolvedValue(false);
+    const ctrl = start();
+    try {
+      await ctrl.openInput({ kind: "busy-probe", key: "busy-probe:1" });
+      await ctrl.openInput({ kind: "busy-probe", key: "busy-probe:2" });
+      const idle = pane().tabs.find((tab) => tab.input.key === "busy-probe:2")!;
+      expect(await ctrl.closeTab(pane().id, idle.id)).toBe(true);
+      expect(confirm).not.toHaveBeenCalled();
+      expect(await ctrl.closeTab(pane().id, pane().tabs[0]!.id)).toBe(false);
+      expect(confirm).toHaveBeenCalledExactlyOnceWith(question("busy-probe:1"));
+    } finally {
+      dispose();
+    }
+  });
+
+  it("counts a failing isBusy as not busy, so the tab still closes", async () => {
+    const warn = vi.spyOn(console, "warn").mockImplementation(() => {});
+    const dispose = busyKind(() => {
+      throw new Error("probe failed");
+    });
+    const ctrl = start();
+    try {
+      await ctrl.openInput({ kind: "busy-probe", key: "busy-probe:1" });
+      expect(await ctrl.closeTab(pane().id, pane().tabs[0]!.id)).toBe(true);
+      expect(confirm).not.toHaveBeenCalled();
+    } finally {
+      dispose();
+      warn.mockRestore();
+    }
+  });
+
+  it("asks only when the last tab of a busy input closes", async () => {
+    const dispose = busyKind(() => true);
+    vi.mocked(confirm).mockResolvedValue(true);
+    const ctrl = start();
+    const input = { kind: "busy-probe", key: "busy-probe:1" };
+    try {
+      await ctrl.openInput(input);
+      ctrl.split(useTabs.getState().activePane, "row");
+      const panes = Object.values(useTabs.getState().panes);
+      // Another pane still shows the input: nothing ends, nothing to ask.
+      expect(await ctrl.closeTab(panes[0]!.id, panes[0]!.tabs[0]!.id)).toBe(true);
+      expect(confirm).not.toHaveBeenCalled();
+      expect(await ctrl.closeInput(input.key)).toBe(true);
+      expect(confirm).toHaveBeenCalledExactlyOnceWith(question("busy-probe:1"));
+    } finally {
+      dispose();
+    }
+  });
+});
+
+describe("editor kinds' isBusy on tab-limit eviction", () => {
+  const limitOne = () =>
+    useProject.setState({ settings: { editor: { tabs: { tabLimit: 1, closingPolicy: "lru" } } } as never });
+
+  it.each([
+    ["a sync answer", (key: string) => key === "busy-probe:1"],
+    ["an async answer", (key: string) => Promise.resolve(key === "busy-probe:1")],
+  ])("skips a busy tab without asking (%s)", async (_name, busy) => {
+    const dispose = busyKind((i) => busy(i.key));
+    const ctrl = start();
+    limitOne();
+    try {
+      await ctrl.openInput({ kind: "busy-probe", key: "busy-probe:1" });
+      await ctrl.openInput({ kind: "busy-probe", key: "busy-probe:2" });
+      await ctrl.openInput({ kind: "busy-probe", key: "busy-probe:3" });
+      // The least recently used tab is the busy one: it stays, the idle one makes room instead.
+      expect(keys()).toEqual(["busy-probe:1", "busy-probe:3"]);
+      expect(confirm).not.toHaveBeenCalled();
+    } finally {
+      dispose();
+    }
+  });
+
+  it("evicts the least recently used tab when none is busy", async () => {
+    const dispose = busyKind(() => false);
+    const ctrl = start();
+    limitOne();
+    try {
+      await ctrl.openInput({ kind: "busy-probe", key: "busy-probe:1" });
+      await ctrl.openInput({ kind: "busy-probe", key: "busy-probe:2" });
+      await ctrl.openInput({ kind: "busy-probe", key: "busy-probe:3" });
+      expect(keys()).toEqual(["busy-probe:3"]);
+    } finally {
+      dispose();
+    }
+  });
+});

src/editor/core/cm/linkedTags.test.ts

@@ -0,0 +1,271 @@
+import { afterEach, describe, expect, it } from "vitest";
+import { EditorSelection, EditorState, type Extension } from "@codemirror/state";
+import { EditorView } from "@codemirror/view";
+import { history, redo, undo } from "@codemirror/commands";
+import { html } from "@codemirror/lang-html";
+import { linkedTags } from "./linkedTags";
+import { prefsExtension } from "./prefs";
+import { angular } from "./angular";
+import { astro } from "./astro";
+import { django } from "./django";
+import { jsp } from "./jsp";
+import { vueLanguage } from "./vue";
+import { validateEditorExtras } from "@/platform/editorSettings";
+
+const views: EditorView[] = [];
+afterEach(() => views.splice(0).forEach((v) => v.destroy()));
+
+const extensions: Extension = [html(), linkedTags];
+
+/** `|` marks carets, `[`/`]` a selection. */
+function make(text: string, extra: Extension = []) {
+  return makeWith([EditorState.allowMultipleSelections.of(true), extensions, extra], text);
+}
+
+/** Like `make`, with the full extension list spelled out. */
+function makeWith(extensions: Extension, text: string) {
+  const ranges: ReturnType<typeof EditorSelection.cursor>[] = [];
+  let doc = "";
+  let anchor = -1;
+  for (const ch of text) {
+    if (ch === "|") ranges.push(EditorSelection.cursor(doc.length));
+    else if (ch === "[") anchor = doc.length;
+    else if (ch === "]") ranges.push(EditorSelection.range(anchor, doc.length));
+    else doc += ch;
+  }
+  const view = new EditorView({
+    state: EditorState.create({
+      doc,
+      selection: EditorSelection.create(ranges.length ? ranges : [EditorSelection.cursor(0)]),
+      extensions,
+    }),
+    parent: document.body,
+  });
+  views.push(view);
+  return view;
+}
+
+function show(view: EditorView): string {
+  const { doc, selection } = view.state;
+  let out = doc.toString();
+  for (const r of [...selection.ranges].sort((a, b) => b.from - a.from))
+    out = r.empty
+      ? out.slice(0, r.head) + "|" + out.slice(r.head)
+      : out.slice(0, r.from) + "[" + out.slice(r.from, r.to) + "]" + out.slice(r.to);
+  return out;
+}
+
+/** Types `text` at every caret / over every selection, as typing does. */
+function type(view: EditorView, text: string) {
+  const { state } = view;
+  view.dispatch(
+    state.changeByRange((r) => ({
+      changes: { from: r.from, to: r.to, insert: text },
+      range: EditorSelection.cursor(r.from + text.length),
+    })),
+    { userEvent: "input.type" },
+  );
+}
+
+/** One Backspace before every caret. */
+function backspace(view: EditorView) {
+  const { state } = view;
+  view.dispatch(
+    state.changeByRange((r) => ({
+      changes: { from: Math.max(0, r.head - 1), to: r.head },
+      range: EditorSelection.cursor(Math.max(0, r.head - 1)),
+    })),
+    { userEvent: "delete.backward" },
+  );
+}
+
+describe("linked html tags", () => {
+  it("renames the closing tag while the opening one is typed", () => {
+    const v = make('<div| class="container">\n  Content\n</div>');
+    type(v, "ision");
+    expect(v.state.doc.toString()).toBe('<division class="container">\n  Content\n</division>');
+    // The caret stays where the user typed, not in the mirrored tag.
+    expect(show(v)).toBe('<division| class="container">\n  Content\n</division>');
+  });
+
+  it("renames the opening tag while the closing one is typed", () => {
+    const v = make('<div class="container">\n  Content\n</div|>');
+    type(v, "ision");
+    expect(v.state.doc.toString()).toBe('<division class="container">\n  Content\n</division>');
+  });
+
+  it("renames a name typed at its start", () => {
+    const v = make("<|div></div>");
+    type(v, "s");
+    expect(v.state.doc.toString()).toBe("<sdiv></sdiv>");
+  });
+
+  it("follows deletions", () => {
+    const v = make("<div|></div>");
+    backspace(v);
+    expect(v.state.doc.toString()).toBe("<di></di>");
+    backspace(v);
+    expect(v.state.doc.toString()).toBe("<d></d>");
+  });
+
+  it("follows a selection replaced with a new name", () => {
+    const v = make("<[div]>x</div>");
+    type(v, "article");
+    expect(v.state.doc.toString()).toBe("<article>x</article>");
+    expect(show(v)).toBe("<article|>x</article>");
+  });
+
+  it("pairs the outer tags of nested same-name elements", () => {
+    const v = make("<div>\n  <div>inner</div>\n</div|>");
+    type(v, "s");
+    expect(v.state.doc.toString()).toBe("<divs>\n  <div>inner</div>\n</divs>");
+  });
+
+  it("pairs the inner tags of nested same-name elements", () => {
+    const v = make("<div>\n  <div|>inner</div>\n</div>");
+    type(v, "s");
+    expect(v.state.doc.toString()).toBe("<div>\n  <divs>inner</divs>\n</div>");
+  });
+
+  it("renames two elements with one caret each", () => {
+    const v = make("<p|>one</p>\n<h2|>two</h2>");
+    type(v, "x");
+    expect(v.state.doc.toString()).toBe("<px>one</px>\n<h2x>two</h2x>");
+  });
+
+  it("leaves both tags alone when the caret edits both at once", () => {
+    const v = make("<div|></div|>");
+    type(v, "s");
+    expect(v.state.doc.toString()).toBe("<divs></divs>");
+  });
+
+  it("mirrors only the caret inside a tag name", () => {
+    const v = make("<p|>one\nplain| text\n</p>");
+    type(v, "x");
+    expect(v.state.doc.toString()).toBe("<px>one\nplainx text\n</px>");
+  });
+
+  it("skips rather than guesses with two carets in one name", () => {
+    const v = make("<di|v|></div>");
+    type(v, "x");
+    expect(v.state.doc.toString()).toBe("<dixvx></div>");
+  });
+
+  it("does not touch other tags or attributes", () => {
+    const v = make('<div class="container" |>\n  <span>keep</span>\n</div>');
+    type(v, "x");
+    expect(v.state.doc.toString()).toBe('<div class="container" x>\n  <span>keep</span>\n</div>');
+  });
+
+  it("skips void and self-closing tags", () => {
+    const v = make("<p>before</p>\n<img|>\n<br>");
+    type(v, "x");
+    expect(v.state.doc.toString()).toBe("<p>before</p>\n<imgx>\n<br>");
+    const selfClosing = make("<p>before</p>\n<div|/>");
+    type(selfClosing, "x");
+    expect(selfClosing.state.doc.toString()).toBe("<p>before</p>\n<divx/>");
+  });
+
+  it("skips unclosed elements and stray close tags", () => {
+    const v = make("<div|>unclosed");
+    type(v, "x");
+    expect(v.state.doc.toString()).toBe("<divx>unclosed");
+    const stray = make("<p>before</p>\n</div|>");
+    type(stray, "x");
+    expect(stray.state.doc.toString()).toBe("<p>before</p>\n</divx>");
+  });
+
+  it("keeps a partially typed tag unmirrored", () => {
+    const v = make("<di|v");
+    type(v, "s");
+    expect(v.state.doc.toString()).toBe("<disv");
+  });
+
+  it("does not follow structural characters typed at the name's edge", () => {
+    // `/` would make the open tag self-closing; `>` would end it: neither extends the name.
+    const v = make("<div|></div>");
+    type(v, "/");
+    expect(v.state.doc.toString()).toBe("<div/></div>");
+    const closing = make("<div>content</di|v>");
+    type(closing, ">");
+    expect(closing.state.doc.toString()).toBe("<div>content</di>v>");
+  });
+
+  it("undoes the pair as one step and redoes it", () => {
+    const v = make("<div|></div>", history());
+    type(v, "x");
+    expect(v.state.doc.toString()).toBe("<divx></divx>");
+    expect(undo(v)).toBe(true);
+    expect(v.state.doc.toString()).toBe("<div></div>");
+    expect(redo(v)).toBe(true);
+    expect(v.state.doc.toString()).toBe("<divx></divx>");
+  });
+
+  // Every mode whose outer parser is `@lezer/html`: renaming an opening tag follows into
+  // the closing one (prefs.ts enables the filter for exactly these language ids).
+  describe("in the html-based modes", () => {
+    const modes: [string, () => Extension][] = [
+      ["Vue", () => vueLanguage()],
+      ["Angular Template", () => angular()],
+      ["JSP", () => jsp()],
+      ["Django Template", () => django()],
+      ["Astro", () => astro()],
+    ];
+
+    for (const [name, language] of modes) {
+      it(`renames the closing tag while the opening one is typed in ${name}`, () => {
+        const v = makeWith([language(), linkedTags], '<div| class="a">x</div>');
+        type(v, "s");
+        expect(v.state.doc.toString()).toBe('<divs class="a">x</divs>');
+      });
+    }
+  });
+
+  describe("the smart key gates the filter", () => {
+    /** The real wiring: prefsExtension attaches the filter for the document's language. */
+    const prefs = (language: string | undefined, smartKeys: Record<string, unknown> = {}) =>
+      makeWith(
+        [
+          EditorState.allowMultipleSelections.of(true),
+          // A parseable tree: the real editors attach the mode's parser beside prefsExtension.
+          html(),
+          prefsExtension({
+            prefs: validateEditorExtras({ smartKeys }),
+            path: "",
+            softWrap: false,
+            showWhitespace: false,
+            hardWrapAt: 120,
+            readOnly: false,
+            language,
+          }),
+        ],
+        "<div|></div>",
+      );
+
+    it("links tags for plain html", () => {
+      const v = prefs("html");
+      type(v, "s");
+      expect(v.state.doc.toString()).toBe("<divs></divs>");
+    });
+
+    it("links tags for the html-based language ids", () => {
+      for (const language of ["vue", "jsp", "django-html", "astro"]) {
+        const v = prefs(language);
+        type(v, "s");
+        expect(v.state.doc.toString()).toBe("<divs></divs>");
+      }
+    });
+
+    it("stays off when the option is off", () => {
+      const v = prefs("html", { simultaneousTagEditing: false });
+      type(v, "s");
+      expect(v.state.doc.toString()).toBe("<divs></div>");
+    });
+
+    it("stays off for the token-based erb mode", () => {
+      const v = prefs("erb");
+      type(v, "s");
+      expect(v.state.doc.toString()).toBe("<divs></div>");
+    });
+  });
+});

src/editor/core/cm/linkedTags.ts

@@ -0,0 +1,84 @@
+/**
+ * Linked editing for matching HTML tags, as in IDEA's Simultaneous
+ * `<tag></tag>` editing (on by default) and VS Code's Linked Editing: editing
+ * the name in an opening (or closing) tag renames the matching tag of the same
+ * element as you type. Done from the syntax tree — `@lezer/html`'s
+ * `OpenTag`/`CloseTag` elements, shared by every HTML-based mode — so it works
+ * without a language server.
+ *
+ * A transaction whose change lies inside one tag's `TagName` is extended with
+ * the same edit at the same offset in the counterpart's name — one
+ * transaction, so undo takes both back together. Without a matching tag (void
+ * and self-closing tags, unclosed elements, a stray close tag) or with the two
+ * names already different (malformed markup) nothing follows: the tags stay as
+ * they are.
+ */
+import { EditorState, type Extension, type Transaction } from "@codemirror/state";
+import { syntaxTree } from "@codemirror/language";
+import type { SyntaxNode, Tree } from "@lezer/common";
+import { isExternalChange } from "@/editor/api";
+
+/** The `TagName` a changed range edits — an insertion at either edge extends the name. */
+function tagNameAround(tree: Tree, from: number, to: number): SyntaxNode | null {
+  let n = tree.resolveInner(from, -1);
+  if (n.name !== "TagName") n = tree.resolveInner(from, 1);
+  return n.name === "TagName" && n.from <= from && to <= n.to ? n : null;
+}
+
+/** The matching tag's name of the same element, or null without one. */
+function counterpartName(name: SyntaxNode): SyntaxNode | null {
+  const tag = name.parent;
+  const element = tag?.parent;
+  if (!tag || element?.name !== "Element") return null;
+  const other = element.getChild(
+    /^Open/.test(tag.name) ? tag.name.replace("Open", "Close") : tag.name.replace("Close", "Open"),
+  );
+  return other?.getChild("TagName") ?? null;
+}
+
+/** Insertions at a name's edge must extend the name; structural characters end it. */
+const NOT_NAME_CHARS = /[\s/>"'<=]/;
+
+/**
+ * Editing the name of an opening (or closing) HTML tag renames its matching
+ * tag, from the syntax tree — no language server. Installed while Smart Keys ›
+ * Simultaneous `<tag></tag>` editing is on (the default).
+ */
+export const linkedTags: Extension = EditorState.transactionFilter.of((tr: Transaction) => {
+  const state = tr.startState;
+  if (!tr.docChanged || state.readOnly || isExternalChange(tr)) return tr;
+  const tree = syntaxTree(state);
+  const edits: { from: number; to: number; insert: string }[] = [];
+  tr.changes.iterChanges((fromA, toA, _fromB, _toB, inserted) =>
+    edits.push({ from: fromA, to: toA, insert: inserted.toString() }),
+  );
+  const mirrored: { from: number; to: number; insert: string }[] = [];
+  const targets = new Set<number>();
+  for (const edit of edits) {
+    const name = tagNameAround(tree, edit.from, edit.to);
+    if (!name || NOT_NAME_CHARS.test(edit.insert)) continue;
+    const other = counterpartName(name);
+    // Names that already differ mean malformed markup: leave the tags alone.
+    if (!other || state.sliceDoc(name.from, name.to) !== state.sliceDoc(other.from, other.to)) continue;
+    // Both ends edited at once (a second caret, undo of a linked edit): already in step.
+    if (edits.some((e) => e.from <= other.to && other.from <= e.to)) continue;
+    // Two carets in one name: their offsets would not line up; skip rather than guess.
+    if (targets.has(other.from)) return tr;
+    targets.add(other.from);
+    mirrored.push({
+      from: other.from + (edit.from - name.from),
+      to: other.from + (edit.to - name.from),
+      insert: edit.insert,
+    });
+  }
+  if (!mirrored.length) return tr;
+  return [
+    tr,
+    {
+      changes: mirrored
+        .map((m) => ({ from: tr.changes.mapPos(m.from, -1), to: tr.changes.mapPos(m.to, 1), insert: m.insert }))
+        .sort((a, b) => a.from - b.from),
+      sequential: true,
+    },
+  ];
+});

src/editor/core/cm/prefs.ts

@@ -52,6 +52,7 @@ import { enterInLineComment, lineCommentStyle, type LineCommentStyle } from "./c
 import { enterInBlockComment, enterInDocComment } from "./docComment";
 import { renderDocComments } from "./renderedDocs";
 import { skipClosingQuote, smartAngleBrackets, smartBackspace, smartBackspaceApplies, tabOut } from "./smartKeys";
+import { linkedTags } from "./linkedTags";
 import { stringClipboard } from "./stringClipboard";
 import { filterCopiedText } from "./clipboard";
 import { LINE_INSET } from "./lineInset";
@@ -480,6 +481,14 @@ export const GUTTER_ICON_GROUPS = [
   { id: "colors", gutterClass: "cm-openidea-gutter-colors" },
 ] as const;
 
+/**
+ * Languages whose outer parser is `@lezer/html`, where simultaneous
+ * `<tag></tag>` editing works from the syntax tree. Angular templates carry
+ * the `html` backend id (the Angular mode is picked per project), `erb` is a
+ * token-based mode without a syntax tree and stays out.
+ */
+const LINKED_TAG_LANGUAGES = new Set(["html", "vue", "jsp", "django-html", "astro"]);
+
 export interface PrefsOptions {
   prefs: EditorExtras;
   path: string;
@@ -605,6 +614,11 @@ export function prefsExtension(o: PrefsOptions): Extension {
   if (!k.surroundSelection) out.push(Prec.highest(noSurround));
   if (k.pairQuotes) out.push(Prec.highest(skipClosingQuote));
   if (k.tabOutOfPair) out.push(tabOut);
+  // Simultaneous `<tag></tag>` editing, from the syntax tree: every mode whose outer
+  // parser is `@lezer/html` — plain HTML plus the HTML-based modes (Vue SFCs, Angular
+  // templates, JSP, Django and Astro; Angular templates carry the `html` backend id).
+  // ERB is token-based (no syntax tree), so it stays out.
+  if (!o.readOnly && k.simultaneousTagEditing && LINKED_TAG_LANGUAGES.has(o.language ?? "")) out.push(linkedTags);
   if (o.commentStyle) out.push(lineCommentStyle.of(o.commentStyle));
 
   const keys = [];

src/editor/core/controller.ts

@@ -41,7 +41,7 @@ import {
 } from "@/workbench/contributions";
 import { useDistractionFree } from "@/workbench/distractionFree";
 import { restoreMaximizedToolWindow } from "@/workbench/toolwindows/store";
-import { ask } from "@/workbench/messages";
+import { ask, confirm } from "@/workbench/messages";
 import { t } from "@/platform/i18n";
 import { call, commands } from "@/platform/ipc";
 import { isRemoteWindow } from "@/platform/remote";
@@ -92,6 +92,7 @@ import {
   documentDirty,
   documentLifecycle,
   failures,
+  inputBusy,
   inputDirty,
   type CustomDocument,
 } from "./model/customDocuments";
@@ -1226,27 +1227,40 @@ export class EditorController implements SlotHost {
     }
   }
 
+  /**
+   * Tabs of kinds with an `isBusy` answer are never evicted (that would end a
+   * running process unasked): their answers are resolved first, so the sync
+   * and the async ones are protected alike.
+   */
   private enforcePaneTabLimit(paneId: string, keep?: string, liveKeys?: ReadonlySet<string>) {
-    const prefs = editorPrefs().tabs;
-    const protect = (tab: Tab) =>
-      !!liveKeys?.has(tab.input.key) || inputDirty(tab.input, useContributions.getState().editorKinds) === true;
-    return this.removeGuarded(
-      (current) =>
-        current.panes[paneId]
-          ? enforceTabLimit(
-              current,
-              paneId,
-              prefs.tabLimit,
-              prefs.closingPolicy,
-              (tab) =>
-                inputDirty(tab.input, useContributions.getState().editorKinds) ??
-                !!(tab.input.path && useDocMeta.getState()[tab.input.path]?.dirty),
-              keep ?? current.panes[paneId]?.active ?? undefined,
-              protect,
-            )
-          : current,
-      { protect },
-    );
+    const kinds = useContributions.getState().editorKinds;
+    const busyCapable = (useTabs.getState().panes[paneId]?.tabs ?? []).filter((t) => kinds.get(t.input.kind)?.isBusy);
+    const evict = (busy: ReadonlySet<string>) => {
+      const prefs = editorPrefs().tabs;
+      // A tab whose kind reports a running process is never evicted: that would end it unasked.
+      const protect = (tab: Tab) =>
+        busy.has(tab.input.key) || inputDirty(tab.input, kinds) === true || !!liveKeys?.has(tab.input.key);
+      return this.removeGuarded(
+        (current) =>
+          current.panes[paneId]
+            ? enforceTabLimit(
+                current,
+                paneId,
+                prefs.tabLimit,
+                prefs.closingPolicy,
+                (tab) =>
+                  inputDirty(tab.input, kinds) ?? !!(tab.input.path && useDocMeta.getState()[tab.input.path]?.dirty),
+                keep ?? current.panes[paneId]?.active ?? undefined,
+                protect,
+              )
+            : current,
+        { protect },
+      );
+    };
+    if (!busyCapable.length) return evict(new Set());
+    return Promise.all(
+      busyCapable.map(async (tab) => ((await inputBusy(tab.input, kinds)) ? tab.input.key : null)),
+    ).then((keys) => evict(new Set(keys.filter((key): key is string => key !== null))));
   }
 
   activate(paneId: string, tabId: string, focus = true) {
@@ -1316,6 +1330,30 @@ export class EditorController implements SlotHost {
     });
   }
 
+  /**
+   * Inputs about to lose their last tab whose kind reports them busy
+   * (`EditorKindContribution.isBusy`): asks before ending what runs in them,
+   * like closing a busy terminal session. Resolves false to keep the tabs.
+   */
+  private async confirmBusyClose(removal: (s: TabsState) => TabsState): Promise<boolean> {
+    const kinds = useContributions.getState().editorKinds;
+    const current = useTabs.getState();
+    const remaining = openKeys(removal(current));
+    const closing = new Map<string, EditorInput>();
+    for (const pane of Object.values(current.panes))
+      for (const tab of pane.tabs)
+        if (!remaining.has(tab.input.key) && kinds.get(tab.input.kind)?.isBusy) closing.set(tab.input.key, tab.input);
+    const busy: string[] = [];
+    for (const input of closing.values()) if (await inputBusy(input, kinds)) busy.push(tabTitle(input, kinds));
+    if (!busy.length) return true;
+    const name = busy.join(", ");
+    return confirm({
+      title: t("editor.closeBusy.title", { name }),
+      message: t("editor.closeBusy.message", { name }),
+      ok: t("editor.closeBusy.terminate"),
+    });
+  }
+
   /** Close exactly the originally selected tabs, evaluating references after every await. */
   private removeGuarded(
     select: (s: TabsState) => TabsState,
@@ -1389,6 +1427,8 @@ export class EditorController implements SlotHost {
           }
           authorized.add(d.input.key);
         }
+        if (!(await this.confirmBusyClose(currentRemoval))) return false;
+        if (generation !== this.projectGeneration) return false;
         if (options.beforeRemove && !(await options.beforeRemove())) return false;
         // Commit only the original target ids against the latest tab state.
         if (generation !== this.projectGeneration) return false;

src/editor/core/librarySources.ts

@@ -1,10 +1,10 @@
 import { useEffect, useState } from "react";
 import { create } from "zustand";
 import { registerActions } from "@/platform/actions";
-import { call, commands, isCancelled, nextRequestId, type RequestId } from "@/platform/ipc";
+import { call, commands, isCancelled, nextRequestId, onIdeEvent, type RequestId } from "@/platform/ipc";
 import { tx } from "@/platform/i18n";
 import { useProject } from "@/platform/project";
-import { invalidateVirtualDocument } from "@/platform/virtualDocs";
+import { invalidateVirtualDocument, invalidateVirtualDocuments } from "@/platform/virtualDocs";
 import { maybeEditorService, notifications } from "@/workbench/contributions";
 
 interface SourceState {
@@ -82,6 +82,9 @@ export function registerLibrarySourcesActions(): () => void {
   const offProject = useProject.subscribe((state, previous) => {
     if (state.project !== previous.project) clear();
   });
+  // A reload may have replaced a library jar in place (a SNAPSHOT installed again): reopened
+  // classes fetch their contents again (the backend refreshes the open ones).
+  const offRoots = onIdeEvent("projectRootsChanged", () => invalidateVirtualDocuments());
   const offActions = registerActions([
     {
       id: "editor.downloadSources",
@@ -118,6 +121,7 @@ export function registerLibrarySourcesActions(): () => void {
   return () => {
     offActions();
     offProject();
+    offRoots();
     clear();
   };
 }

src/editor/core/model/customDocuments.ts

@@ -52,6 +52,19 @@ export function inputDirty(input: EditorInput, kinds: Kinds): boolean | null {
   return lifecycle ? documentDirty({ input, lifecycle }) : null;
 }
 
+/**
+ * Whether the input's editor kind reports it busy (`EditorKindContribution.isBusy`).
+ * A failing check counts as not busy, so a broken kind cannot make its tabs unclosable.
+ */
+export async function inputBusy(input: EditorInput, kinds: Kinds): Promise<boolean> {
+  try {
+    return (await kinds.get(input.kind)?.isBusy?.(input)) === true;
+  } catch (e) {
+    console.warn(`editor input ${input.key}: isBusy failed`, e);
+    return false;
+  }
+}
+
 /** The rejection reasons of `results` (an AggregateError contributes each of its errors). */
 export function failures(results: readonly PromiseSettledResult<unknown>[]): unknown[] {
   return results.flatMap((r) =>

src/editor/lsp/codeLens.ts

@@ -9,7 +9,7 @@ import { Channel } from "@tauri-apps/api/core";
 import { EditorSelection, MapMode, StateEffect, StateField, type Extension, type Text } from "@codemirror/state";
 import { EditorView, ViewPlugin, type ViewUpdate } from "@codemirror/view";
 import { codeLenses, shownAgain, type CodeLens } from "@/editor/api";
-import { executeAction } from "@/platform/actions";
+import { executeAction, getAction } from "@/platform/actions";
 import { commands, nextRequestId, type OutlineItem, type RequestId, type SymbolKind } from "@/platform/ipc";
 import { useProject } from "@/platform/project";
 import { debounce, docOf, isUnavailable, lspRequest } from "./lsp";
@@ -106,6 +106,12 @@ const lensField = StateField.define<CodeLens[]>({
 const usagesEnabled = () => editorPrefs().inlay.codeVisionUsages;
 const authorEnabled = () => editorPrefs().inlay.codeVisionAuthor;
 
+/** The author hint opens the file's blame annotations, and leaves them open when shown. */
+function showAnnotations(view: EditorView) {
+  view.focus();
+  if (!getAction("vcs.annotate")?.toggled?.()) void executeAction("vcs.annotate");
+}
+
 function openUsages(view: EditorView, offset: number) {
   view.dispatch({ selection: EditorSelection.cursor(offset), userEvent: "select.lens" });
   view.focus();
@@ -258,6 +264,7 @@ class UsagesLensPlugin {
             icon: "user",
             order: 20,
             kind: "author",
+            run: showAnnotations,
           });
         const n = usages ? this.cache.get(key(t)) : undefined;
         if (n === undefined || (n === 0 && !editorPrefs().inlay.codeVisionNoUsages)) continue;

src/editor/lsp/diagnostics.ts

@@ -235,12 +235,16 @@ const lintTheme = EditorView.theme({
   ".cm-lintRange-error": {
     textDecoration: "var(--editor-error-decoration, underline wavy var(--danger))",
     WebkitTextDecoration: "var(--editor-error-decoration, underline wavy var(--danger))",
+    fontWeight: "var(--wave-error-bold, inherit)",
+    fontStyle: "var(--wave-error-italic, inherit)",
     textDecorationSkipInk: "none",
     textUnderlineOffset: "3px",
   },
   ".cm-lintRange-warning": {
     textDecoration: "var(--editor-warning-decoration, underline wavy var(--warning))",
     WebkitTextDecoration: "var(--editor-warning-decoration, underline wavy var(--warning))",
+    fontWeight: "var(--wave-warning-bold, inherit)",
+    fontStyle: "var(--wave-warning-italic, inherit)",
     backgroundColor: "var(--editor-warning-background, transparent)",
     textDecorationSkipInk: "none",
     textUnderlineOffset: "3px",
@@ -254,8 +258,10 @@ const lintTheme = EditorView.theme({
   ".cm-lintRange-hint": { textDecoration: "none" },
   // Typo level: IDEA's green wavy underline.
   ".cm-lintRange.cm-lsp-typo": {
-    textDecoration: "underline wavy color-mix(in srgb, var(--success) 85%, transparent)",
-    WebkitTextDecoration: "underline wavy color-mix(in srgb, var(--success) 85%, transparent)",
+    textDecoration: "var(--wave-typo-effect, underline wavy var(--wave-typo, var(--success)))",
+    WebkitTextDecoration: "var(--wave-typo-effect, underline wavy var(--wave-typo, var(--success)))",
+    fontWeight: "var(--wave-typo-bold, inherit)",
+    fontStyle: "var(--wave-typo-italic, inherit)",
     textDecorationSkipInk: "none",
     textUnderlineOffset: "3px",
   },
@@ -263,9 +269,16 @@ const lintTheme = EditorView.theme({
     textDecoration: "none",
     backgroundColor: "transparent",
     color: "var(--fg-unused, var(--fg-faint))",
+    fontWeight: "var(--fg-unused-bold, inherit)",
+    fontStyle: "var(--fg-unused-italic, inherit)",
   },
   ".cm-lintRange.cm-lsp-unnecessary *": { color: "var(--fg-unused, var(--fg-faint))" },
-  ".cm-lintRange.cm-lsp-deprecated": { textDecoration: "line-through", textDecorationColor: "var(--fg-muted)" },
+  ".cm-lintRange.cm-lsp-deprecated": {
+    textDecoration: "var(--fg-deprecated-effect, line-through var(--fg-deprecated, var(--fg-muted)))",
+    WebkitTextDecoration: "var(--fg-deprecated-effect, line-through var(--fg-deprecated, var(--fg-muted)))",
+    fontWeight: "var(--fg-deprecated-bold, inherit)",
+    fontStyle: "var(--fg-deprecated-italic, inherit)",
+  },
   // An error or warning on the same range (merged into one mark) keeps its underline.
   ".cm-lintRange-error.cm-lsp-typo, .cm-lintRange-error.cm-lsp-unnecessary": {
     textDecoration: "var(--editor-error-decoration, underline wavy var(--danger))",

src/editor/navigation/implementationGutter.ts

@@ -39,6 +39,7 @@ import { gutterIconMarkup } from "@/ui";
 import {
   MARKER_ICONS,
   candidateKey,
+  implementsMarker,
   inheritorsMarker,
   markerCandidates,
   supersMarker,
@@ -167,10 +168,13 @@ export async function fillMarkers(
     groups.has("inheritors") && !cache.unsupported.has("inheritors")
       ? candidates.filter((c) => c.inheritable && cache.entries.get(candidateKey(c))?.inheritors === undefined)
       : [];
-  const up =
-    groups.has("supers") && !cache.unsupported.has("supers")
-      ? candidates.filter((c) => c.overriding && c.owner && cache.entries.get(candidateKey(c))?.supers === undefined)
-      : [];
+  const askSupers = groups.has("supers") && !cache.unsupported.has("supers");
+  const up = askSupers
+    ? candidates.filter((c) => c.overriding && c.owner && cache.entries.get(candidateKey(c))?.supers === undefined)
+    : [];
+  const implicit = askSupers
+    ? candidates.filter((c) => c.implicit && cache.entries.get(candidateKey(c))?.supers === undefined)
+    : [];
 
   let implementations: Location[][] = [];
   const known = down.length ? await fromHierarchy(path, down, deps.supers) : new Map<MarkerCandidate, Location[]>();
@@ -206,13 +210,26 @@ export async function fillMarkers(
   }
   const supers: SuperMethod[][] = [];
   for (const c of up) supers.push(await superMethodTargets(path, c.owner!, c.symbol, deps.supers));
+  // Go: an implementation request on a type or method answers the interfaces it satisfies.
+  let satisfied: Location[][] = [];
+  if (implicit.length) {
+    try {
+      satisfied = await deps.implementations(implicit.map((c) => ({ line: c.line, col: c.col })));
+    } catch (e) {
+      if (isCancelled(e)) throw e;
+      if (isUnavailable(e)) cache.unsupported.add("supers");
+      implicit.length = 0;
+    }
+  }
 
   const files = await deps.readFiles([
     ...implementations.flat().map((l) => l.path),
     ...supers.flat().map((s) => s.location.path),
+    ...satisfied.flat().map((l) => l.path),
   ]);
   down.forEach((c, i) => (entry(c).inheritors = inheritorsMarker(c, implementations[i] ?? [], files)));
   up.forEach((c, i) => (entry(c).supers = supersMarker(c, supers[i]!, files)));
+  implicit.forEach((c, i) => (entry(c).supers = implementsMarker(c, withoutSelf(path, c, satisfied[i] ?? []), files)));
 }
 
 /**
@@ -481,7 +498,9 @@ class MarkersPlugin {
         if (stale()) return;
         entry.outline = {
           items,
-          candidates: markerCandidates(items, (l) => (l < text.lines ? text.line(l + 1).text : "")),
+          candidates: markerCandidates(items, (l) => (l < text.lines ? text.line(l + 1).text : ""), {
+            implicitInterfaces: ctx.language === "go",
+          }),
         };
       }
       const { candidates, items } = entry.outline;

src/editor/navigation/lineMarkers.test.ts

@@ -125,7 +125,34 @@ const BASE_OUTLINE = [
   item("Base", "class", 0, 3, [item("run()", "method", 1, 1, [], 25), item("label()", "method", 2, 2, [], 18)], 22),
 ];
 
+// main.go, as gopls outlines it: methods sit outside their type.
+const GO = [
+  "package main",
+  "",
+  "type Shape interface {",
+  "\tArea() float64",
+  "}",
+  "",
+  "type Square struct{ side float64 }",
+  "",
+  "func (s *Square) Area() float64 { return s.side * s.side }",
+  "",
+  "type Celsius float64",
+  "",
+  "func main() {}",
+];
+const GO_PATH = "/p/main.go";
+const GO_OUTLINE = [
+  item("Shape", "interface", 2, 4, [item("Area", "method", 3, 3, [], 1)], 5),
+  item("Square", "struct", 6, 6, [], 5),
+  item("(*Square).Area", "method", 8, 8, [], 17),
+  item("Celsius", "class", 10, 10, [], 5),
+  item("main", "function", 12, 12, [], 5),
+];
+
 const FILES: Record<string, string[]> = {
+  [GO_PATH]: GO,
+  "/go/src/fmt/print.go": ["package fmt", "type Stringer interface {", "\tString() string", "}"],
   [SHAPE_PATH]: SHAPE,
   "/p/Circle.java": CIRCLE,
   "/p/Square.java": ["public class Square implements Shape {", "    public double area() { return 2; }", "}"],
@@ -158,6 +185,17 @@ describe("marker candidates", () => {
     ]);
   });
 
+  it("Go: types and receiver methods satisfy interfaces; only interfaces have implementations", () => {
+    const found = markerCandidates(GO_OUTLINE, lines(GO), { implicitInterfaces: true });
+    expect(found.map((c) => [c.name, c.method, c.inheritable, !!c.implicit])).toEqual([
+      ["Shape", false, true, false],
+      ["Area", true, true, false],
+      ["Square", false, false, true],
+      ["Area", true, false, true],
+      ["Celsius", false, false, true],
+    ]);
+  });
+
   it("skips structs, enums and free functions for implementation requests", () => {
     const outline = [item("Point", "struct", 0, 3, [item("len", "method", 1, 1)]), item("main", "function", 5, 6)];
     const found = markerCandidates(outline, () => "");
@@ -228,6 +266,31 @@ describe("markers from server answers", () => {
     expect(markers[0]!.chooserTitle).toBe("Choose Implementation of Shape (2 found)");
   });
 
+  it("Go: marks the interfaces a type satisfies and the interface methods a method implements", async () => {
+    const { deps } = server(
+      {
+        [`${GO_PATH}:2`]: [loc(GO_PATH, 6, 5)],
+        [`${GO_PATH}:3`]: [loc(GO_PATH, 8, 17)],
+        [`${GO_PATH}:6`]: [loc(GO_PATH, 2, 5)],
+        [`${GO_PATH}:8`]: [loc(GO_PATH, 3, 1)],
+        [`${GO_PATH}:10`]: [loc("/go/src/fmt/print.go", 1, 5)],
+      },
+      {},
+    );
+    const candidates = markerCandidates(GO_OUTLINE, lines(GO), { implicitInterfaces: true });
+    const cache = emptyCache();
+    await fillMarkers(GO_PATH, candidates, ALL, deps(GO_PATH), cache);
+    const markers = cachedMarkers(candidates, ALL, cache);
+    expect(markers.map((m) => [m.line, m.kind, m.tooltip])).toEqual([
+      [2, "implemented", "Is implemented by Square"],
+      [3, "implemented", "Is implemented in Square"],
+      [6, "implementing", "Implements Shape"],
+      [8, "implementing", "Implements method in Shape"],
+      [10, "implementing", "Implements Stringer"],
+    ]);
+    expect(markers[2]!.chooserTitle).toBe("Choose Implemented Interface of Square (1 found)");
+  });
+
   it("marks subclassed classes and overridden methods", async () => {
     const { deps } = server(
       {

src/editor/navigation/lineMarkers.ts

@@ -38,6 +38,11 @@ export interface MarkerCandidate {
   overriding: boolean;
   /** Identifier position of the enclosing type (methods). */
   owner: { line: number; col: number } | null;
+  /**
+   * Satisfies interfaces implicitly (Go): an implementation request on it answers the interfaces
+   * a type satisfies, or the interface methods a method implements.
+   */
+  implicit?: boolean;
 }
 
 export interface LineMarker {
@@ -54,6 +59,8 @@ export interface LineMarker {
 /** Types whose subtypes / implementations are worth a marker (not structs, enums: they cannot be extended). */
 const INHERITABLE_TYPES = new Set<SymbolKind>(["class", "interface", "trait"]);
 const ABSTRACT_TYPES = new Set<SymbolKind>(["interface", "trait"]);
+/** Go declarations that can satisfy an interface: named types other than interfaces, and methods. */
+const IMPLICIT_KINDS = new Set<SymbolKind>(["struct", "class", "method"]);
 /** Types whose methods may implement or override a supertype's. */
 const MEMBER_OWNERS = new Set<SymbolKind>(["class", "interface", "trait", "enum", "struct"]);
 
@@ -88,12 +95,30 @@ function declarationPrefix(item: OutlineItem, lineText: (line: number) => string
 export function markerCandidates(
   outline: readonly OutlineItem[],
   lineText: (line: number) => string,
+  options: { implicitInterfaces?: boolean } = {},
 ): MarkerCandidate[] {
   const out: MarkerCandidate[] = [];
   const walk = (items: readonly OutlineItem[], parent: OutlineItem | null) => {
     for (const it of items) {
       const prefix = () => declarationPrefix(it, lineText);
       const at = it.selection_range.start;
+      // Go: named types and their methods (`(*Square).Area`, outside the type) only satisfy
+      // interfaces; nothing extends them.
+      if (options.implicitInterfaces && !parent && IMPLICIT_KINDS.has(it.kind)) {
+        out.push({
+          symbol: it.name,
+          name: it.name.replace(/^\([^)]*\)\./, ""),
+          line: at.line,
+          col: at.col,
+          method: it.kind === "method",
+          abstract: false,
+          inheritable: false,
+          overriding: false,
+          owner: null,
+          implicit: true,
+        });
+        continue;
+      }
       if (INHERITABLE_TYPES.has(it.kind)) {
         const p = prefix();
         out.push({
@@ -136,7 +161,10 @@ export function withoutSelf(path: string, c: MarkerCandidate, targets: readonly
   return targets.filter((t) => !(t.path === path && t.range.start.line === c.line));
 }
 
-const TYPE_DECLARATION = /\b(?:class|interface|trait|object|struct|enum|record|impl)\s+([\p{L}_$][\p{L}\p{N}_$]*)/u;
+const TYPE_DECLARATION =
+  /\b(?:class|interface|trait|object|struct|enum|record|impl)\s+([\p{L}_$][\p{L}\p{N}_$]*)|^\s*type\s+([\p{L}_][\p{L}\p{N}_]*)(?:\[[^\]]*\])?\s+(?:interface|struct)\b/u;
+/** A Go method's receiver type: `func (s *Square) Area()`. */
+const GO_RECEIVER = /^\s*func\s*\(\s*(?:[\p{L}_][\p{L}\p{N}_]*\s+)?\*?\s*([\p{L}_][\p{L}\p{N}_]*)/u;
 
 const FENCES = [`"""`, `'''`];
 
@@ -166,13 +194,15 @@ export function enclosingType(lines: readonly string[] | null | undefined, targe
     // A single-line docstring (fences open and close on the line) is text too.
     if (FENCES.some((f) => code.includes(f))) continue;
     const m = TYPE_DECLARATION.exec(code);
-    if (m && !/^\s*(\*|\/\*)/.test(line)) container = m[1]!;
+    if (m && !/^\s*(\*|\/\*)/.test(line)) container = (m[1] ?? m[2])!;
   }
   return container;
 }
 
 /** Name of the type a target sits in: the nearest type declaration above it, else the file name. */
 export function enclosingTypeName(lines: readonly string[] | null | undefined, target: Location): string {
+  const receiver = GO_RECEIVER.exec(lines?.[target.range.start.line] ?? "")?.[1];
+  if (receiver) return receiver;
   const found = enclosingType(lines, target);
   if (found) return found;
   const file = target.path.split(/[\\/]/).pop() ?? target.path;
@@ -222,6 +252,27 @@ export function inheritorsMarker(
   return { kind, line: c.line, name: c.name, targets: [...targets], tooltip, chooserTitle };
 }
 
+/** ↑ marker of a Go type or method from the interfaces (methods) it satisfies; null without any. */
+export function implementsMarker(
+  c: MarkerCandidate,
+  targets: readonly Location[],
+  files: ReadonlyMap<string, string[] | null>,
+): LineMarker | null {
+  if (!targets.length) return null;
+  const names = nameList(targets.map((t) => targetName(files.get(t.path), t, c.method)));
+  const n = targets.length;
+  return {
+    kind: "implementing",
+    line: c.line,
+    name: c.name,
+    targets: [...targets],
+    tooltip: c.method ? tx`Implements method in ${names}` : tx`Implements ${names}`,
+    chooserTitle: c.method
+      ? tx`Choose Super Method of ${c.name} (${n} found)`
+      : tx`Choose Implemented Interface of ${c.name} (${n} found)`,
+  };
+}
+
 /** Whether a super method is abstract: declared in an interface / trait, or marked `abstract`. */
 export function isAbstractSuper(s: SuperMethod, files: ReadonlyMap<string, string[] | null>): boolean {
   const lines = files.get(s.location.path);

src/features/agents/Agents.module.css

@@ -180,6 +180,10 @@
   display: flex;
   flex-direction: column;
 }
+.taskSearch {
+  flex: none;
+  margin: 6px 8px 4px;
+}
 .history {
   display: flex;
   flex-direction: column;

src/features/agents/AgentsView.test.tsx

@@ -391,6 +391,32 @@ describe("Agents pinned and grouped tasks", () => {
     expect(treeRows().some((text) => text.includes("Pinned"))).toBe(false);
   });
 
+  it("filters every section by the search, archived ones included, and highlights the match", () => {
+    const tasks = useAgents.getState().tasks;
+    const rename = (id: string, title: string, status: AgentTask["status"] = "ready") =>
+      tasks.set(id, { ...tasks.get(id)!, title, status });
+    rename("one", "Fix the lexer");
+    rename("two", "Refactor parser");
+    rename("three", "Lexer cleanup", "archived");
+    useAgents.setState({ tasks: new Map(tasks), organize: { groups: [frontend], groupOf: { two: "g1" }, pinned: [] } });
+    setup();
+    const field = screen.getByLabelText("Search tasks");
+    fireEvent.change(field, { target: { value: "lxr" } });
+    const rows = treeRows();
+    expect(rows.some((text) => text.includes("Fix the lexer"))).toBe(true);
+    // Archived is collapsed by default; a search looks inside it.
+    expect(rows.some((text) => text.includes("Lexer cleanup"))).toBe(true);
+    // The user group has no match: it goes.
+    expect(rows.some((text) => text.includes("Frontend") || text.includes("Refactor parser"))).toBe(false);
+    const lexer = screen.getAllByRole("treeitem").find((item) => item.textContent?.includes("Fix the lexer"))!;
+    expect([...lexer.querySelectorAll("mark")].map((m) => m.textContent).join("")).toBe("lxr");
+
+    fireEvent.change(field, { target: { value: "nothing like it" } });
+    expect(screen.getByText("No matching tasks")).toBeInTheDocument();
+    fireEvent.keyDown(field, { key: "Escape" });
+    expect(treeRows().some((text) => text.includes("Frontend"))).toBe(true);
+  });
+
   it("shows a user group above the status groups, without its tasks in them too", () => {
     useAgents.setState({ organize: { groups: [frontend], groupOf: { two: "g1" }, pinned: [] } });
     setup();

src/features/agents/AgentsView.tsx

@@ -5,9 +5,11 @@ import type { AgentStatus as Status, AgentTask } from "@/bindings";
 import { EDITOR_TAB_MIME, maybeEditorService, type EditorInput } from "@/workbench/contributions";
 import {
   EmptyState,
+  HighlightedText,
   Icon,
   IconButton,
   Popup,
+  SearchField,
   Spinner,
   T,
   Tree,
@@ -15,6 +17,7 @@ import {
   showContextMenu,
   startPointerDrag,
   type IconName,
+  type TreeHandle,
 } from "@/ui";
 import {
   SESSION_KIND,
@@ -37,6 +40,7 @@ import {
   useAgents,
 } from "./store";
 import { groupMenu, taskMenu } from "./taskActions";
+import { matchTask } from "./taskSearch";
 import { SessionEditor } from "./SessionEditor";
 import { HomeEditor } from "./HomeEditor";
 import styles from "./Agents.module.css";
@@ -187,6 +191,8 @@ export function AgentsView() {
     return new Set(task ? [task] : []);
   });
   const organize = useAgents((s) => s.organize);
+  const [query, setQuery] = useState("");
+  const treeRef = useRef<TreeHandle>(null);
   // Follow the active session tab.
   useEffect(
     () =>
@@ -201,20 +207,32 @@ export function AgentsView() {
       }),
     [],
   );
+  // While searching: the matching tasks of every section, collapsed ones included; empty sections go.
+  const matches = useMemo(() => {
+    if (!query.trim()) return null;
+    const found = new Map<string, number[]>();
+    for (const task of tasks.values()) {
+      const hit = matchTask(task, query);
+      if (hit) found.set(task.id, hit);
+    }
+    return found;
+  }, [tasks, query]);
   const roots = useMemo<Node[]>(() => {
-    const all = [...tasks.values()];
+    const all = [...tasks.values()].filter((t) => !matches || matches.has(t.id));
     const pinned = pinnedMembers(all, organize);
     return [
       ...(pinned.length ? [{ kind: "pinned", tasks: pinned } as Node] : []),
-      ...organize.groups.map((group): Node => ({
-        kind: "custom",
-        group,
-        tasks: groupMembers(tasks.values(), organize, group.id),
-      })),
+      ...organize.groups.flatMap((group): Node[] => {
+        const members = groupMembers(all, organize, group.id);
+        return matches && !members.length ? [] : [{ kind: "custom", group, tasks: members }];
+      }),
       ...groupTasks(ungroupedMembers(all, organize)).map((group): Node => ({ kind: "group", group })),
     ];
-  }, [tasks, organize]);
-  const expanded = useMemo(() => new Set(roots.map(nodeKey).filter((k) => !collapsed.has(k))), [roots, collapsed]);
+  }, [tasks, organize, matches]);
+  const expanded = useMemo(
+    () => new Set(roots.map(nodeKey).filter((k) => matches || !collapsed.has(k))),
+    [roots, collapsed, matches],
+  );
   // Dropping a session editor tab anywhere on the tool window docks it.
   const viewRef = useRef<HTMLDivElement>(null);
   const [tabOver, setTabOver] = useState(false);
@@ -251,8 +269,35 @@ export function AgentsView() {
 
   const taskList = (
     <div className={styles.tasks}>
+      {tasks.size > 0 && (
+        <SearchField
+          className={styles.taskSearch}
+          value={query}
+          onChange={setQuery}
+          clearable
+          placeholder={tx("Search tasks")}
+          aria-label={tx("Search tasks")}
+          onKeyDown={(e) => {
+            if (e.key === "ArrowDown" || e.key === "ArrowUp") {
+              e.preventDefault();
+              treeRef.current?.moveSelection(e.key === "ArrowDown" ? 1 : -1);
+            } else if (e.key === "Enter") {
+              const lead = treeRef.current?.leadKey();
+              if (lead && tasks.has(lead)) {
+                e.preventDefault();
+                showTask(lead);
+              }
+            } else if (e.key === "Escape" && query) {
+              e.preventDefault();
+              e.stopPropagation();
+              setQuery("");
+            }
+          }}
+        />
+      )}
       <Tree<Node>
         aria-label="Agent tasks"
+        handleRef={treeRef}
         roots={roots}
         getKey={nodeKey}
         getLabel={(n) =>
@@ -331,7 +376,11 @@ export function AgentsView() {
                 >
                   <Icon name={providerIcon(n.task.provider)} size={16} label={providerName(n.task.provider)} />
                   <span className={styles.title} data-unread={unread.has(n.task.id) || undefined}>
-                    {n.task.title}
+                    {matches?.get(n.task.id)?.length ? (
+                      <HighlightedText text={n.task.title} indices={matches.get(n.task.id)!} />
+                    ) : (
+                      n.task.title
+                    )}
                   </span>
                   {/* Ready tasks say so by their group; the others show what they're doing. */}
                   {n.task.status !== "ready" && <TaskStatusIcon status={n.task.status} />}
@@ -352,12 +401,18 @@ export function AgentsView() {
           }
         }}
         empty={
-          <div className={styles.empty}>
-            <T>No agent tasks yet</T>
-            <button type="button" className={styles.link} onClick={() => openHome()}>
-              <T>New Task…</T>
-            </button>
-          </div>
+          matches ? (
+            <div className={styles.empty}>
+              <T>No matching tasks</T>
+            </div>
+          ) : (
+            <div className={styles.empty}>
+              <T>No agent tasks yet</T>
+              <button type="button" className={styles.link} onClick={() => openHome()}>
+                <T>New Task…</T>
+              </button>
+            </div>
+          )
         }
       />
     </div>

src/features/agents/Composer.module.css

@@ -22,58 +22,62 @@
     inset 0 0 0 1px var(--focus-ring),
     0 0 0 1px var(--focus-ring);
 }
+/* The CodeMirror text field: the UI font, wrapping, growing with the text up to a limit. */
 .field {
   position: relative;
+  min-width: 0;
 }
-/* Tags under the transparent textarea: same font, metrics and padding, so the caret
-   and selection of the real textarea line up with the painted text. */
-.mirror {
-  position: absolute;
-  inset: 0;
-  overflow: hidden;
-  padding: 10px 12px 2px;
-  font: inherit;
+.field :global(.cm-editor) {
+  background: transparent;
+  color: var(--fg-strong);
   font-size: var(--fs-ui);
+}
+.field :global(.cm-editor.cm-focused) {
+  outline: none;
+}
+.field :global(.cm-scroller) {
+  min-height: 44px;
+  max-height: 280px;
+  overflow-y: auto;
+  font-family: inherit;
   line-height: 1.5;
+}
+.field :global(.cm-content) {
+  padding: 10px 12px 2px;
+  caret-color: var(--fg-strong);
   white-space: pre-wrap;
   overflow-wrap: anywhere;
-  color: var(--fg-strong);
-  pointer-events: none;
-  -webkit-user-select: none;
-  user-select: none;
 }
-.textarea {
-  position: relative;
-  z-index: 1;
-  display: block;
-  width: 100%;
-  min-height: 44px;
-  resize: none;
-  border: 0;
-  outline: none;
-  background: transparent;
-  color: transparent;
-  caret-color: var(--fg-strong);
-  font: inherit;
-  font-size: var(--fs-ui);
-  line-height: 1.5;
-  padding: 10px 12px 2px;
-  overflow-wrap: anywhere;
-  -webkit-user-select: text;
-  user-select: text;
+.field :global(.cm-line) {
+  padding: 0;
 }
-.textarea:focus-visible {
-  outline: none;
+/* A wide card (a ``` block) takes the text's width, its code scrolling inside, rather than
+   widening the text past the box. */
+.field :global(.cm-content) {
+  min-width: 0;
 }
-.textarea::placeholder {
+.field :global(.cm-placeholder) {
   color: var(--fg-faint);
 }
-/* The textarea's own glyphs are transparent so the mirror above shows the tags; the
-   selection would then paint an empty highlight. Paint the selected glyphs here instead —
-   the opaque selection background covers the mirror underneath. */
-.textarea::selection {
+.field :global(.cm-cursor) {
+  border-left-color: var(--fg-strong);
+}
+.field ::selection {
   background: var(--bg-editor-selection);
+}
+/* A dragged file over the box: what dropping does. */
+.dropOverlay {
+  position: absolute;
+  z-index: 2;
+  inset: 0;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: 8px;
+  border-radius: inherit;
+  background: color-mix(in srgb, var(--bg-popup) 82%, transparent);
   color: var(--fg-strong);
+  pointer-events: none;
 }
 .bar {
   display: flex;
@@ -347,17 +351,19 @@
   color: var(--fg-subtle);
 }
 
-.images {
+/* Above the text: the current file to reference, attached files and images. */
+.context {
   display: flex;
   flex-wrap: wrap;
+  align-items: center;
   gap: 6px;
   padding: 8px 10px 0;
   cursor: default;
 }
 .image {
   position: relative;
-  width: 44px;
-  height: 44px;
+  width: 40px;
+  height: 40px;
   border-radius: var(--radius-small);
   box-shadow: inset 0 0 0 1px var(--border);
   overflow: hidden;
@@ -393,21 +399,63 @@
   opacity: 0;
 }
 .image:hover .removeImage,
-.attachment:hover .removeImage,
 .removeImage:focus-visible {
   opacity: 1;
 }
 
-.attachment {
+/* Attached files and the current-file suggestion: one height, like the chips in the text. */
+.attachment,
+.suggestion {
   position: relative;
   display: inline-flex;
   align-items: center;
-  gap: 6px;
+  gap: 5px;
   max-width: 240px;
-  height: 44px;
-  padding: 0 10px;
-  border-radius: var(--radius-small);
+  height: 24px;
+  padding: 0 4px 0 7px;
+  border-radius: var(--radius-control);
   box-shadow: inset 0 0 0 1px var(--border);
+  font-size: var(--fs-small);
+  color: var(--fg-strong);
+}
+.suggestion {
+  padding-right: 8px;
+  border: 0;
+  background: none;
+  box-shadow: none;
+  outline: 1px dashed var(--border-strong);
+  outline-offset: -1px;
+  color: var(--fg-muted);
+  cursor: pointer;
+  transition:
+    color var(--dur-fast) var(--ease),
+    background var(--dur-fast) var(--ease);
+}
+.suggestion:hover {
+  background: var(--bg-hover);
+  color: var(--fg-strong);
+}
+.suggestion:focus-visible {
+  outline: 2px solid var(--focus-ring);
+}
+.suggestionHint {
+  color: var(--fg-faint);
+}
+.removeChip {
+  display: grid;
+  place-items: center;
+  width: 16px;
+  height: 16px;
+  padding: 0;
+  border: 0;
+  border-radius: var(--radius-small);
+  background: none;
+  color: var(--fg-muted);
+  cursor: pointer;
+}
+.removeChip:hover {
+  background: var(--bg-hover);
+  color: var(--fg-strong);
 }
 .attachmentName {
   overflow: hidden;
@@ -416,16 +464,6 @@
 }
 
 /* `@` / `/` completion; Popup keeps the list within the viewport. */
-.caretMirror {
-  position: fixed;
-  top: 0;
-  left: 0;
-  box-sizing: border-box;
-  visibility: hidden;
-  pointer-events: none;
-  white-space: pre-wrap;
-  overflow-wrap: break-word;
-}
 .popup {
   display: flex;
   flex-direction: column;
@@ -453,3 +491,30 @@
   text-overflow: ellipsis;
   color: var(--fg-subtle);
 }
+.match {
+  background: none;
+  color: var(--fg-completion-match, var(--accent));
+  font-weight: 600;
+}
+.popupFooter {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 4px 14px;
+  padding: 5px 12px 6px;
+  border-top: 1px solid var(--border);
+  color: var(--fg-subtle);
+  font-size: var(--fs-small);
+}
+.popupFooter kbd {
+  display: inline-grid;
+  place-items: center;
+  min-width: 16px;
+  height: 16px;
+  margin-right: 2px;
+  padding: 0 3px;
+  border-radius: var(--radius-small);
+  background: var(--bg-hover);
+  color: var(--fg-muted);
+  font-family: var(--font-keys, inherit);
+  font-size: var(--fs-tiny, 11px);
+}

src/features/agents/Home.module.css

@@ -31,7 +31,8 @@
   display: flex;
   flex-wrap: wrap;
   align-items: center;
-  gap: 6px;
+  /* The chips' own padding spaces them. */
+  gap: 2px;
   padding: 0 2px;
   font-size: var(--fs-small);
 }
@@ -67,7 +68,6 @@
 .docked .where {
   flex-wrap: nowrap;
   min-width: 0;
-  gap: 6px;
 }
 .docked .projectPicker,
 .docked .projectChip {

src/features/agents/Markdown.tsx

@@ -11,7 +11,6 @@ import { Marked } from "marked";
 import DOMPurify from "dompurify";
 import { highlightInto } from "@/editor/lsp/markdown";
 import { iconNode } from "@/editor/lsp/iconMarkup";
-import { call, commands } from "@/platform/ipc";
 import { tx } from "@/platform/i18n";
 import { openExternalUrl } from "@/platform/openUrl";
 import { copyText } from "@/ui";
@@ -20,6 +19,7 @@ import { hasMermaid, renderMermaidIn } from "@/features/viewers/markdown/mermaid
 import { subscribeTheme, themeKey } from "@/platform/themeWatch";
 import { fileHref, pathLink, type PathLink } from "./conversation";
 import { loadImages, type MessageImages } from "./markdownImages";
+import { fileExists } from "./ReferenceChip";
 import styles from "./Session.module.css";
 
 const escapeHtml = (s: string) =>
@@ -167,20 +167,6 @@ function wrapLooseText(li: Element) {
   flush();
 }
 
-/** Whether a path names an existing file, per path (agents name the same files again and again). */
-const existing = new Map<string, Promise<boolean>>();
-function fileExists(path: string): Promise<boolean> {
-  let known = existing.get(path);
-  if (!known) {
-    known = call(commands.fsProbe(path)).then(
-      () => true,
-      () => false,
-    );
-    existing.set(path, known);
-  }
-  return known;
-}
-
 export function openPathLink(link: PathLink) {
   const selection = link.line === undefined ? undefined : { line: link.line, col: link.col ?? 0 };
   void editorService().openFile(link.path, { selection, focus: true });

src/features/agents/ReferenceChip.module.css

@@ -0,0 +1,262 @@
+/* An `@file` / `/skill` reference: icon, name and line range, in the composer and in sent messages. */
+.chip {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  max-width: 100%;
+  height: 20px;
+  padding: 0 6px 0 4px;
+  margin: 0 1px;
+  vertical-align: -4px;
+  border-radius: var(--radius-selection);
+  background: color-mix(in srgb, var(--fg) 9%, transparent);
+  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--fg) 14%, transparent);
+  color: var(--fg-strong);
+  font-size: var(--fs-small);
+  line-height: 20px;
+  white-space: nowrap;
+  cursor: pointer;
+  user-select: none;
+  transition:
+    background var(--dur-fast) var(--ease),
+    box-shadow var(--dur-fast) var(--ease);
+}
+.chip:hover {
+  background: color-mix(in srgb, var(--accent) 16%, transparent);
+  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 40%, transparent);
+}
+.chip:focus-visible {
+  outline: none;
+  box-shadow: 0 0 0 2px var(--focus-ring);
+}
+.chip > svg,
+.chip > img {
+  flex: none;
+}
+.name {
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+.lines {
+  flex: none;
+  color: var(--fg-muted);
+  font-variant-numeric: tabular-nums;
+}
+/* The file is gone (renamed or deleted since it was referenced). */
+.missing {
+  color: var(--fg-muted);
+  background: transparent;
+  box-shadow: none;
+  outline: 1px dashed var(--border-strong);
+  outline-offset: -1px;
+}
+.missing .name {
+  text-decoration: line-through;
+}
+/* Selected together with the text around it in the composer. */
+.selected {
+  background: var(--bg-editor-selection);
+}
+/* A `/command` or skill. */
+.command {
+  display: inline;
+  padding: 1px 3px;
+  margin: 0 -3px;
+  border-radius: var(--radius-selection);
+  -webkit-box-decoration-break: clone;
+  box-decoration-break: clone;
+  color: var(--accent);
+  background: color-mix(in srgb, var(--accent) 16%, transparent);
+}
+/* `@something` that names no referenced file: as typed, just marked. */
+.pending {
+  color: var(--fg-strong);
+  text-decoration: underline dotted color-mix(in srgb, var(--fg) 40%, transparent);
+  text-underline-offset: 3px;
+}
+
+/* A quoted reply or selection in a sent message: as a Markdown quote in a reply. */
+.quote {
+  margin: 2px 0 6px;
+  padding: 0 10px;
+  border-left: 3px solid var(--border-strong);
+  color: var(--fg-secondary);
+}
+
+/* Hover card: the full path, and the referenced lines (or the file's first lines). */
+.card {
+  position: fixed;
+  z-index: 1000;
+  top: 0;
+  left: 0;
+  width: max-content;
+  max-width: min(520px, calc(100vw - 24px));
+  border-radius: var(--radius-popup);
+  background: var(--bg-popup);
+  box-shadow:
+    0 0 0 1px var(--border-popup),
+    var(--shadow-popup);
+  color: var(--fg);
+  font-size: var(--fs-small);
+  pointer-events: none;
+  overflow: hidden;
+}
+.cardHead {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  padding: 6px 10px;
+}
+.cardPath {
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  color: var(--fg-strong);
+}
+.cardMeta {
+  flex: none;
+  margin-left: auto;
+  padding-left: 12px;
+  color: var(--fg-subtle);
+}
+.cardCode {
+  display: flex;
+  margin: 0;
+  padding: 6px 10px 8px;
+  border-top: 1px solid var(--border);
+  background: var(--bg-editor-inline, var(--bg-elev));
+  color: var(--fg-editor);
+  font-family: var(--font-mono);
+  font-size: var(--fs-small);
+  line-height: 1.5;
+  white-space: pre;
+  overflow: hidden;
+  tab-size: 4;
+}
+.cardLine {
+  flex: none;
+  min-width: 3ch;
+  margin-right: 10px;
+  color: var(--fg-line-number);
+  text-align: right;
+  user-select: none;
+}
+
+/* A quote in the composer: its lines as one block, the `>` hidden. */
+.quoteLine {
+  margin-left: 0;
+  padding-left: 10px !important;
+  border-left: 3px solid var(--border-strong);
+  color: var(--fg-secondary);
+}
+.quoteFirst {
+  margin-top: 2px;
+}
+.quoteLast {
+  margin-bottom: 4px;
+}
+
+/* Sent message text: lays out as the text it wraps. */
+.text {
+  display: contents;
+}
+
+/* A ``` block (pasted code, terminal output): a card with a title, the line count and the code. */
+.codeCard {
+  display: block;
+  box-sizing: border-box;
+  max-width: 100%;
+  min-width: 0;
+  margin: 4px 0 6px;
+  border-radius: var(--radius-control);
+  background: var(--bg-editor-inline, var(--bg-elev));
+  box-shadow: inset 0 0 0 1px var(--border);
+  white-space: normal;
+  overflow: hidden;
+  cursor: default;
+}
+.codeHead {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  height: 26px;
+  padding: 0 4px 0 8px;
+  border-bottom: 1px solid var(--border);
+  color: var(--fg-strong);
+  font-size: var(--fs-small);
+}
+.codeTitle {
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+.codeMeta {
+  flex: none;
+  margin-left: auto;
+  color: var(--fg-subtle);
+}
+.codeRemove,
+.codeCopy {
+  display: grid;
+  flex: none;
+  place-items: center;
+  width: 18px;
+  height: 18px;
+  padding: 0;
+  border: 0;
+  border-radius: var(--radius-small);
+  background: none;
+  color: var(--fg-muted);
+  cursor: pointer;
+}
+.codeRemove:hover,
+.codeCopy:hover {
+  background: var(--bg-hover);
+  color: var(--fg-strong);
+}
+.codeBody {
+  margin: 0;
+  padding: 6px 10px;
+  color: var(--fg-editor);
+  font-family: var(--font-mono);
+  font-size: var(--fs-small);
+  line-height: 1.5;
+  white-space: pre;
+  overflow-x: auto;
+  tab-size: 4;
+}
+/* More lines than shown: the last ones fade out. */
+.codeFaded {
+  -webkit-mask-image: linear-gradient(to bottom, var(--fg) 55%, transparent);
+  mask-image: linear-gradient(to bottom, var(--fg) 55%, transparent);
+}
+.codeMore {
+  display: block;
+  width: 100%;
+  height: 24px;
+  border: 0;
+  border-top: 1px solid var(--border);
+  background: none;
+  color: var(--link);
+  font-size: var(--fs-small);
+  cursor: pointer;
+}
+.codeMore:hover {
+  background: var(--bg-hover);
+}
+/* In the composer: the card opens as text on a click. */
+.codeCard[title] {
+  cursor: pointer;
+}
+.codeCard[title]:hover {
+  box-shadow: inset 0 0 0 1px var(--border-strong);
+}
+/* A ``` block being edited as text in the composer. */
+.codeLine {
+  font-family: var(--font-mono);
+  font-size: var(--fs-small);
+  background: var(--bg-editor-inline, var(--bg-elev));
+}

src/features/agents/ReferenceChip.tsx

@@ -0,0 +1,401 @@
+/**
+ * `@file` / `@folder/` / `@file:10-20` references drawn as chips (icon, name, lines), in the
+ * composer and in sent messages: a click opens the file at its lines (a folder is selected in
+ * the Project view), hovering shows the full path and the lines.
+ */
+import { Fragment, useEffect, useRef, useState, type ReactNode } from "react";
+import clsx from "clsx";
+import { computePosition, flip, offset, shift } from "@floating-ui/react-dom";
+import { highlightInto, languageForPath } from "@/editor/lsp/markdown";
+import { iconNode } from "@/editor/lsp/iconMarkup";
+import { executeAction } from "@/platform/actions";
+import { tx, useTx } from "@/platform/i18n";
+import { call, commands } from "@/platform/ipc";
+import { basename } from "@/platform/project";
+import { copyText, fileIconName, Icon } from "@/ui";
+import { editorService } from "@/workbench/contributions";
+import {
+  fenceLabel,
+  fencedBlocks,
+  isQuoteLine,
+  linesLabel,
+  messageTokens,
+  parseMention,
+  resolveTyped,
+  type Mention,
+} from "./composerModel";
+import styles from "./ReferenceChip.module.css";
+
+export { styles as chipStyles };
+
+/** Whether a path names an existing file or folder, per path (the same files come up again and again). */
+const existing = new Map<string, Promise<boolean>>();
+export function fileExists(path: string): Promise<boolean> {
+  let known = existing.get(path);
+  if (!known) {
+    known = call(commands.fsProbe(path)).then(
+      () => true,
+      () => false,
+    );
+    existing.set(path, known);
+  }
+  return known;
+}
+
+/** Opens a referenced file at its first line, or selects a folder in the Project view. */
+export function openReference(path: string, mention: Mention) {
+  if (mention.dir) {
+    void executeAction("navigate.selectInProjectView", path.replace(/\/$/, ""));
+    return;
+  }
+  const selection = mention.lines ? { line: mention.lines.from - 1, col: 0 } : undefined;
+  void editorService().openFile(path, { selection, focus: true });
+}
+
+const nameOf = (m: Mention) => basename(m.rel.replace(/\/$/, "")) || m.rel;
+const iconOf = (m: Mention) => (m.dir ? "folder" : fileIconName(nameOf(m), m.rel));
+
+/** The chip as DOM, for the composer's editor. */
+export function chipElement(path: string, mention: Mention): HTMLElement {
+  const chip = document.createElement("span");
+  chip.className = styles.chip!;
+  chip.dataset.refPath = path;
+  chip.dataset.refRel = mention.rel;
+  if (mention.lines) chip.dataset.refLines = linesLabel(mention.lines);
+  chip.setAttribute("aria-label", ariaLabel(mention));
+  chip.append(iconNode(iconOf(mention), 14));
+  const name = document.createElement("span");
+  name.className = styles.name!;
+  name.textContent = nameOf(mention);
+  chip.append(name);
+  if (mention.lines) {
+    const lines = document.createElement("span");
+    lines.className = styles.lines!;
+    lines.textContent = linesLabel(mention.lines);
+    chip.append(lines);
+  }
+  if (!mention.dir)
+    void fileExists(path).then((exists) => {
+      if (!exists) chip.classList.add(styles.missing!);
+    });
+  return chip;
+}
+
+function ariaLabel(m: Mention): string {
+  const name = nameOf(m);
+  if (m.dir) return tx`Folder reference ${name}`;
+  if (!m.lines) return tx`File reference ${name}`;
+  const lines = linesLabel(m.lines);
+  return tx`File reference ${name}, lines ${lines}`;
+}
+
+/** A reference in a sent message. */
+export function ReferenceChip({ path, mention }: { path: string; mention: Mention }) {
+  const [missing, setMissing] = useState(false);
+  useEffect(() => {
+    let alive = true;
+    if (!mention.dir) void fileExists(path).then((exists) => alive && setMissing(!exists));
+    return () => {
+      alive = false;
+    };
+  }, [path, mention.dir]);
+  return (
+    <button
+      type="button"
+      className={clsx(styles.chip, missing && styles.missing)}
+      data-ref-path={path}
+      data-ref-rel={mention.rel}
+      data-ref-lines={mention.lines ? linesLabel(mention.lines) : undefined}
+      aria-label={ariaLabel(mention)}
+      onClick={() => openReference(path, mention)}
+    >
+      <Icon name={iconOf(mention)} size={14} />
+      <span className={styles.name}>{nameOf(mention)}</span>
+      {mention.lines && <span className={styles.lines}>{linesLabel(mention.lines)}</span>}
+    </button>
+  );
+}
+
+/**
+ * Message text with its references as chips, `/commands` tagged, `>` quotes and ``` blocks as cards.
+ * `cwd` is the directory references resolve in.
+ */
+export function ReferencedText({ text, cwd }: { text: string; cwd: string }) {
+  const [root, setRoot] = useState<HTMLSpanElement | null>(null);
+  useReferenceHover(root);
+  const all = text.split("\n");
+  const blocks: ({ kind: "quote" | "text"; text: string } | { kind: "code"; info: string; text: string })[] = [];
+  const push = (kind: "quote" | "text", body: string) => {
+    const last = blocks.at(-1);
+    if (last && last.kind === kind) last.text += `\n${body}`;
+    else blocks.push({ kind, text: body });
+  };
+  let i = 0;
+  for (const fence of [...fencedBlocks(all), null]) {
+    const end = fence ? fence.open : all.length;
+    for (; i < end; i++) {
+      const line = all[i]!;
+      const quote = isQuoteLine(line);
+      push(quote ? "quote" : "text", quote ? line.replace(/^> ?/, "") : line);
+    }
+    if (!fence) break;
+    blocks.push({ kind: "code", info: fence.info, text: all.slice(fence.open + 1, fence.close).join("\n") });
+    i = fence.close + 1;
+  }
+  return (
+    <span ref={setRoot} className={styles.text}>
+      {blocks.map((block, n) => {
+        if (block.kind === "code") return <CodeCard key={n} info={block.info} body={block.text} />;
+        if (block.kind === "quote")
+          return (
+            <div key={n} className={styles.quote}>
+              {block.text}
+            </div>
+          );
+        // A block ends its own line: the paragraph after it starts without an empty one.
+        const body = n > 0 ? block.text.replace(/^\n/, "") : block.text;
+        return <Fragment key={n}>{inline(body, cwd)}</Fragment>;
+      })}
+    </span>
+  );
+}
+
+function inline(text: string, cwd: string): ReactNode[] {
+  return messageTokens(text).map((token, i) => {
+    if (token.kind === "text") return <Fragment key={i}>{token.value}</Fragment>;
+    if (token.kind === "command")
+      return (
+        <span key={i} className={styles.command}>
+          {token.value}
+        </span>
+      );
+    const mention = parseMention(token.value);
+    if (!mention) return <Fragment key={i}>{token.value}</Fragment>;
+    return <ReferenceChip key={i} path={resolveTyped(cwd, mention.rel)} mention={mention} />;
+  });
+}
+
+const HOVER_DELAY = 400;
+const PREVIEW_LINES = 12;
+const MAX_PREVIEW_BYTES = 2 * 1024 * 1024;
+
+/**
+ * Hover cards for the chips below `root`: the full path, and the referenced lines (a file's
+ * first lines without a range). Returns a disposer.
+ */
+export function referenceHover(root: HTMLElement): () => void {
+  let timer: ReturnType<typeof setTimeout> | undefined;
+  let card: HTMLElement | null = null;
+  let current: HTMLElement | null = null;
+
+  const hide = () => {
+    clearTimeout(timer);
+    card?.remove();
+    card = null;
+    current = null;
+  };
+
+  const place = (anchor: HTMLElement, el: HTMLElement) =>
+    void computePosition(anchor, el, {
+      strategy: "fixed",
+      placement: "top-start",
+      middleware: [offset(6), flip(), shift({ padding: 8 })],
+    }).then(({ x, y }) => {
+      el.style.transform = `translate(${Math.round(x)}px, ${Math.round(y)}px)`;
+    });
+
+  const show = (chip: HTMLElement) => {
+    const path = chip.dataset.refPath!;
+    const rel = chip.dataset.refRel!;
+    const mention = parseMention(
+      `@${rel}${chip.dataset.refLines ? `:${chip.dataset.refLines.replace("–", "-")}` : ""}`,
+    );
+    if (!mention) return;
+    const el = document.createElement("div");
+    el.className = styles.card!;
+    el.setAttribute("role", "tooltip");
+    const head = document.createElement("div");
+    head.className = styles.cardHead!;
+    head.append(iconNode(iconOf(mention), 14));
+    const name = document.createElement("span");
+    name.className = styles.cardPath!;
+    name.textContent = rel.replace(/\/$/, "");
+    head.append(name);
+    const meta = document.createElement("span");
+    meta.className = styles.cardMeta!;
+    const lines = mention.lines && linesLabel(mention.lines);
+    meta.textContent = chip.classList.contains(styles.missing!)
+      ? tx("File not found")
+      : lines
+        ? tx`Lines ${lines}`
+        : mention.dir
+          ? tx("Folder")
+          : "";
+    head.append(meta);
+    el.append(head);
+    document.body.append(el);
+    card = el;
+    place(chip, el);
+    if (mention.dir || chip.classList.contains(styles.missing!)) return;
+    void preview(path, mention).then((code) => {
+      if (card !== el || !code) return;
+      el.append(code);
+      place(chip, el);
+    });
+  };
+
+  const over = (e: PointerEvent) => {
+    const chip = (e.target as Element | null)?.closest?.<HTMLElement>("[data-ref-path]") ?? null;
+    if (chip === current) return;
+    hide();
+    if (!chip || !root.contains(chip)) return;
+    current = chip;
+    timer = setTimeout(() => show(chip), HOVER_DELAY);
+  };
+
+  root.addEventListener("pointerover", over);
+  root.addEventListener("pointerleave", hide);
+  root.addEventListener("pointerdown", hide, true);
+  root.addEventListener("keydown", hide, true);
+  root.addEventListener("scroll", hide, true);
+  return () => {
+    hide();
+    root.removeEventListener("pointerover", over);
+    root.removeEventListener("pointerleave", hide);
+    root.removeEventListener("pointerdown", hide, true);
+    root.removeEventListener("keydown", hide, true);
+    root.removeEventListener("scroll", hide, true);
+  };
+}
+
+async function preview(path: string, mention: Mention): Promise<HTMLElement | null> {
+  try {
+    const probe = await call(commands.fsProbe(path));
+    if (probe.binary || probe.size > MAX_PREVIEW_BYTES) return null;
+    const all = (await call(commands.fsReadText(path))).split("\n");
+    const first = mention.lines ? Math.min(mention.lines.from, all.length) : 1;
+    const last = Math.min(mention.lines ? mention.lines.to : PREVIEW_LINES, first + PREVIEW_LINES - 1, all.length);
+    const lines = all.slice(first - 1, last).map((l) => l.replace(/\r$/, "").replace(/\t/g, "    "));
+    while (lines.length && !lines.at(-1)!.trim()) lines.pop();
+    if (!lines.length) return null;
+    const indent = Math.min(...lines.filter((l) => l.trim()).map((l) => /^ */.exec(l)![0].length));
+    const text = lines.map((l) => l.slice(indent)).join("\n");
+    const code = document.createElement("pre");
+    code.className = styles.cardCode!;
+    const gutter = document.createElement("span");
+    gutter.className = styles.cardLine!;
+    gutter.textContent = lines.map((_, i) => first + i).join("\n");
+    const body = document.createElement("code");
+    body.textContent = text;
+    code.append(gutter, body);
+    await highlightInto(body, text, languageForPath(path));
+    return code;
+  } catch {
+    return null;
+  }
+}
+
+function useReferenceHover(root: HTMLElement | null) {
+  const t = useTx();
+  useEffect(() => (root ? referenceHover(root) : undefined), [root, t]);
+}
+
+const KIND_TITLES = { terminal: "Terminal", problems: "Problems", trace: "Stack Trace", text: "Pasted Text" } as const;
+const KIND_ICONS = { terminal: "terminal", problems: "problems", trace: "exception", text: "text" } as const;
+
+/** A ``` block's header: icon and title ("Terminal · zsh", "TypeScript"). */
+function cardTitle(info: string): { icon: string; title: string } {
+  const { kind, label, language } = fenceLabel(info);
+  if (kind !== "code") {
+    const title = tx(KIND_TITLES[kind]);
+    return { icon: KIND_ICONS[kind], title: label ? `${title} · ${label}` : title };
+  }
+  const name = language && label === language ? languageForPath(`x.${language}`) : null;
+  return { icon: language ? fileIconName(`x.${language}`) : "file", title: name ?? (label || tx("Code")) };
+}
+
+const lineCount = (count: number, t: typeof tx) => (count === 1 ? t("1 line") : t`${count} lines`);
+
+const COMPOSER_PREVIEW_LINES = 5;
+
+/**
+ * A ``` block in the composer, folded to a card: its title, line count and first lines.
+ * `onOpen` edits it as text; `onRemove` deletes it.
+ */
+export function codeCardElement(info: string, body: string, onOpen: () => void, onRemove: () => void): HTMLElement {
+  const { icon, title } = cardTitle(info);
+  const lines = body.split("\n");
+  const card = document.createElement("div");
+  card.className = styles.codeCard!;
+  card.setAttribute("role", "group");
+  card.setAttribute("aria-label", title);
+  const head = document.createElement("div");
+  head.className = styles.codeHead!;
+  head.append(iconNode(icon, 14));
+  const name = document.createElement("span");
+  name.className = styles.codeTitle!;
+  name.textContent = title;
+  const meta = document.createElement("span");
+  meta.className = styles.codeMeta!;
+  meta.textContent = lineCount(lines.length, tx);
+  const remove = document.createElement("button");
+  remove.type = "button";
+  remove.className = styles.codeRemove!;
+  remove.setAttribute("aria-label", tx("Remove"));
+  remove.append(iconNode("close", 10));
+  remove.addEventListener("mousedown", (e) => e.preventDefault());
+  remove.addEventListener("click", (e) => {
+    e.stopPropagation();
+    onRemove();
+  });
+  head.append(name, meta, remove);
+  const pre = document.createElement("pre");
+  pre.className = clsx(styles.codeBody, lines.length > COMPOSER_PREVIEW_LINES && styles.codeFaded);
+  const shown = lines.slice(0, COMPOSER_PREVIEW_LINES).join("\n");
+  pre.textContent = shown;
+  const { language, kind } = fenceLabel(info);
+  if (kind === "code") void highlightInto(pre, shown, language);
+  card.append(head, pre);
+  card.title = tx("Click to edit");
+  card.addEventListener("mousedown", (e) => e.preventDefault());
+  card.addEventListener("click", onOpen);
+  return card;
+}
+
+const MESSAGE_PREVIEW_LINES = 12;
+
+/** A ``` block in a sent message: a card with its title, the code highlighted, long ones folded. */
+function CodeCard({ info, body }: { info: string; body: string }) {
+  const t = useTx();
+  const { icon, title } = cardTitle(info);
+  const lines = body.split("\n");
+  const [open, setOpen] = useState(lines.length <= MESSAGE_PREVIEW_LINES);
+  const code = useRef<HTMLPreElement>(null);
+  const shown = open ? body : lines.slice(0, MESSAGE_PREVIEW_LINES).join("\n");
+  useEffect(() => {
+    const el = code.current;
+    if (!el) return;
+    el.textContent = shown;
+    const { language, kind } = fenceLabel(info);
+    if (kind === "code") void highlightInto(el, shown, language);
+  }, [shown, info]);
+  const more = lines.length - MESSAGE_PREVIEW_LINES;
+  return (
+    <div className={styles.codeCard} role="group" aria-label={title}>
+      <div className={styles.codeHead}>
+        <Icon name={icon} size={14} />
+        <span className={styles.codeTitle}>{title}</span>
+        <span className={styles.codeMeta}>{lineCount(lines.length, t)}</span>
+        <button type="button" className={styles.codeCopy} aria-label={t("Copy")} onClick={() => void copyText(body)}>
+          <Icon name="copy" size={12} />
+        </button>
+      </div>
+      <pre ref={code} className={clsx(styles.codeBody, !open && styles.codeFaded)} />
+      {more > 0 && (
+        <button type="button" className={styles.codeMore} onClick={() => setOpen(!open)}>
+          {open ? t("Show less") : t`Show ${more} more lines`}
+        </button>
+      )}
+    </div>
+  );
+}

src/features/agents/Session.module.css

@@ -50,11 +50,13 @@
   color: var(--fg-subtle);
   font-size: var(--fs-small);
 }
+/* The facts on the bar's line are as tall as its chips, so their text shares one centre line. */
 .agent {
   display: inline-flex;
   flex: 0 1 auto;
   align-items: center;
   gap: 4px;
+  height: 22px;
   min-width: 0;
   color: var(--fg-secondary);
 }
@@ -69,7 +71,8 @@
   display: inline-flex;
   flex: 0 1 auto;
   align-items: center;
-  gap: 6px;
+  /* The chips' own padding spaces them. */
+  gap: 2px;
   min-width: 0;
   overflow: hidden;
 }
@@ -78,7 +81,10 @@
   color: var(--fg-subtle);
 }
 .state {
+  display: inline-flex;
   flex: none;
+  align-items: center;
+  height: 22px;
   white-space: nowrap;
 }
 /* The changes sit above the meter, time and terminal; those keep their one row at the right. */
@@ -96,6 +102,7 @@
   display: inline-flex;
   flex: 0 1 auto;
   align-items: center;
+  height: 22px;
   gap: 8px;
   max-width: 100%;
   min-width: 0;
@@ -134,8 +141,8 @@
 }
 .statusChip:hover,
 .statusChip[aria-expanded="true"] {
-  background: var(--bg-hover);
-  color: var(--fg);
+  background: var(--bg-toolbar-hover);
+  color: var(--fg-strong);
 }
 /* In a narrow docked session the chip is narrower than its text: the label ends in an ellipsis. */
 .statusChipLabel {
@@ -310,6 +317,14 @@
     --session-card-width: 96%;
   }
 }
+/* A narrow docked session: rather than cut every fact to a letter or two, the bar keeps the
+   agent's icon and its state; where it works is in the task's tooltip and Changes. */
+@container (max-width: 420px) {
+  .where,
+  .agentName {
+    display: none;
+  }
+}
 .messageActions {
   display: inline-flex;
   gap: 4px;

src/features/agents/SessionEditor.tsx

@@ -43,7 +43,6 @@ import {
   Icon,
   IconButton,
   Input,
-  InlineTag,
   Radio,
   SearchField,
   Spinner,
@@ -64,6 +63,7 @@ import { commitFileDiffData, openDiff, withChain, type DiffData } from "@/featur
 import { repositoryPath } from "@/features/vcs/repositoryPaths";
 import { setChangesOptions, useChangesOptions } from "./changesOptions";
 import { Composer } from "./Composer";
+import { ReferencedText } from "./ReferenceChip";
 import { selectionIn } from "./selection";
 import { SubmitButton } from "./SubmitButton";
 import {
@@ -72,6 +72,7 @@ import {
   emptyDraft,
   limitLabel,
   messageTokens,
+  parseMention,
   retryParts,
   usageLabel,
   workTime,
@@ -351,7 +352,7 @@ function SessionStatus({
         showContextMenu(e, taskMenu([task]));
       }}
     >
-      <span className={styles.agent} title={task.cwd}>
+      <span className={styles.agent} title={`${providerName(task.provider)} · ${task.cwd}`}>
         <Icon name={providerIcon(task.provider)} size={13} className={styles.providerIcon} />
         <span className={styles.agentName}>
           {providerName(task.provider)}
@@ -920,7 +921,10 @@ function Stream({ loadError, task, entries, subagent, onOpenSubagent, finding, f
               const atEnd = el.scrollHeight - el.scrollTop - el.clientHeight < 40;
               const laidOut =
                 el.scrollHeight !== seenHeight.current.content || el.clientHeight !== seenHeight.current.view;
-              seenHeight.current = { content: el.scrollHeight, view: el.clientHeight };
+              seenHeight.current = {
+                content: el.scrollHeight,
+                view: el.clientHeight,
+              };
               const byUser = dragging.current || performance.now() - userScrolled.current < 500 || !laidOut;
               const movedDown = el.scrollTop > position.current.top;
               const stayedAtEnd = position.current.stick && el.scrollTop === position.current.top;
@@ -1009,23 +1013,6 @@ function Stream({ loadError, task, entries, subagent, onOpenSubagent, finding, f
 
 type UserEntry = Extract<AgentEntry, { type: "user" }>;
 
-/** Message text with file references and skills as tags, distinct from prose. */
-function MessageText({ text }: { text: string }) {
-  return (
-    <>
-      {messageTokens(text).map((token, i) =>
-        token.kind === "text" ? (
-          <Fragment key={i}>{token.value}</Fragment>
-        ) : (
-          <InlineTag key={i} accent={token.kind === "command"}>
-            {token.value}
-          </InlineTag>
-        ),
-      )}
-    </>
-  );
-}
-
 /** When a message was sent, or when the turn behind a reply finished, and how long it took. */
 function MessageTime({
   sentMs,
@@ -1430,7 +1417,7 @@ const Entry = memo(function Entry({
             <T>Task from the parent agent</T>
           </div>
           <div className={styles.user}>
-            <MessageText text={entry.text} />
+            <ReferencedText text={entry.text} cwd={task.cwd} />
           </div>
         </div>
       ) : (
@@ -1494,7 +1481,14 @@ function UserMessage({
   }
   const images = entry.images ?? [];
   // Images are listed after the files in `attachments` and shown as thumbnails instead.
-  const files = entry.attachments.slice(0, entry.attachments.length - images.length);
+  // Files mentioned in the text are chips there already.
+  const mentioned = new Set(
+    messageTokens(entry.text).flatMap((t) => {
+      const m = t.kind === "file" ? parseMention(t.value) : null;
+      return m ? [basename(m.rel.replace(/\/$/, ""))] : [];
+    }),
+  );
+  const files = entry.attachments.slice(0, entry.attachments.length - images.length).filter((a) => !mentioned.has(a));
   return (
     <div className={clsx(styles.message, styles.userMessage)}>
       {/* Actions and the time sit beside the author on hover: the reply under it has the turn's duration. */}
@@ -1541,7 +1535,7 @@ function UserMessage({
         </span>
       </div>
       <div className={styles.user}>
-        <MessageText text={entry.text} />
+        <ReferencedText text={entry.text} cwd={task.cwd} />
         <ImageStrip images={images} />
         {files.length > 0 && (
           <div className={styles.attachments}>
@@ -2673,7 +2667,7 @@ function PendingPermission({ task, entry }: { task: AgentTask; entry: Permission
       if (!el?.contains(document.activeElement) && document.activeElement !== document.body) return;
       requestAnimationFrame(() => {
         if (document.activeElement === document.body || !document.activeElement?.isConnected)
-          area?.querySelector<HTMLElement>("textarea")?.focus({ preventScroll: true });
+          area?.querySelector<HTMLElement>(".cm-content")?.focus({ preventScroll: true });
       });
     };
   }, []);
@@ -2952,7 +2946,12 @@ function changeRows(
   commits: readonly AgentCommit[],
   grouped: boolean,
 ): ChangeRow[] {
-  if (!grouped) return uncommitted.map((change) => ({ key: change.path, type: "file" as const, change }));
+  if (!grouped)
+    return uncommitted.map((change) => ({
+      key: change.path,
+      type: "file" as const,
+      change,
+    }));
   const roots: ChangeRow[] = [];
   if (uncommitted.length) {
     roots.push({
@@ -2961,7 +2960,11 @@ function changeRows(
       label: "Uncommitted",
       count: uncommitted.length,
       ...statsOf(uncommitted),
-      children: uncommitted.map((change) => ({ key: `uncommitted:${change.path}`, type: "file", change })),
+      children: uncommitted.map((change) => ({
+        key: `uncommitted:${change.path}`,
+        type: "file",
+        change,
+      })),
     });
   }
   if (commits.length) {
@@ -3006,7 +3009,10 @@ function ChangesPane({
   onHide: () => void;
 }) {
   // The two views key their rows differently: a selection doesn't carry over.
-  const [selection, setSelection] = useState<{ grouped: boolean; keys: ReadonlySet<string> }>(() => ({
+  const [selection, setSelection] = useState<{
+    grouped: boolean;
+    keys: ReadonlySet<string>;
+  }>(() => ({
     grouped,
     keys: NO_SELECTION,
   }));
@@ -3110,7 +3116,10 @@ function ChangesPane({
           body: tx`You changed them yourself, accept them by hand: ${skippedNames}.`,
         });
       } else {
-        notifications().notify({ level: "info", title: tx("Changes accepted") });
+        notifications().notify({
+          level: "info",
+          title: tx("Changes accepted"),
+        });
       }
     } catch (e) {
       notifications().notify({
@@ -3307,7 +3316,10 @@ function uncommittedDiffData(task: AgentTask, change: AgentChange): DiffData {
   const right: DiffData["right"] =
     change.kind === "deleted"
       ? { type: "text", text: "", label: "(deleted)", absent: true }
-      : { type: "worktree", label: task.isolation === "worktree" ? branchLabel(task.branch) : "Working tree" };
+      : {
+          type: "worktree",
+          label: task.isolation === "worktree" ? branchLabel(task.branch) : "Working tree",
+        };
   return { path: change.path, left, right };
 }
 
@@ -3336,7 +3348,12 @@ async function openUncommittedDiff(task: AgentTask, path: string) {
 async function openCommitDiff(task: AgentTask, commit: AgentCommit, path: string) {
   const diffs = commit.files.map((file) =>
     commitFileDiffData(
-      { id: commit.id, shortId: commit.shortId, parents: commit.parent ? [commit.parent] : [], repo: task.cwd },
+      {
+        id: commit.id,
+        shortId: commit.shortId,
+        parents: commit.parent ? [commit.parent] : [],
+        repo: task.cwd,
+      },
       { path: file.relPath, kind: file.kind, oldPath: file.oldPath },
     ),
   );

src/features/agents/agents.test.ts

@@ -19,6 +19,13 @@ import {
   recall,
   toPrompt,
   mergeMatches,
+  messageTokens,
+  fenced,
+  fencedBlocks,
+  fenceLabel,
+  pastedPaths,
+  looksLikeTrace,
+  placesInText,
   retryParts,
   usageLabel,
   limitLabel,
@@ -72,6 +79,53 @@ const option = (category: string, values: string[], current: string | null): Age
   via: "option",
 });
 
+describe("fenced blocks", () => {
+  it("finds closed blocks, a longer fence holding backticks", () => {
+    const text = fenced("a ``` b\n```", "terminal zsh");
+    expect(text).toBe("````terminal zsh\na ``` b\n```\n````");
+    expect(fencedBlocks(["x", ...text.split("\n"), "```ts", "open"])).toEqual([
+      { open: 1, close: 4, info: "terminal zsh" },
+    ]);
+    expect(fenceLabel("terminal zsh")).toEqual({ kind: "terminal", label: "zsh", language: null });
+    expect(fenceLabel("trace")).toEqual({ kind: "trace", label: "", language: null });
+    expect(fenceLabel("ts")).toEqual({ kind: "code", label: "ts", language: "ts" });
+  });
+});
+
+describe("pasted traces", () => {
+  const node =
+    "TypeError: x is undefined\n    at fetchUser (/p/src/api/client.ts:12:5)\n    at node_modules/lib/x.js:3:1";
+  const python =
+    'Traceback (most recent call last):\n  File "/p/app/main.py", line 7, in <module>\n    run()\nValueError: bad';
+  const rust = "thread 'main' panicked at src/main.rs:4:5:\nboom";
+  it("recognises stack traces, not prose", () => {
+    expect([node, python, rust].map(looksLikeTrace)).toEqual([true, true, true]);
+    expect(looksLikeTrace("see src/a.ts:3\nand more")).toBe(false);
+    expect(looksLikeTrace("Error: one line")).toBe(false);
+  });
+  it("finds the places a trace names, leaving dependencies out", () => {
+    expect(placesInText(node)).toEqual([{ path: "/p/src/api/client.ts", line: 12 }]);
+    expect(placesInText(python)).toEqual([{ path: "/p/app/main.py", line: 7 }]);
+    expect(placesInText(rust)).toEqual([{ path: "src/main.rs", line: 4 }]);
+    expect(placesInText("a.ts:1 a.ts:1 b.ts:2", 1)).toEqual([{ path: "a.ts", line: 1 }]);
+  });
+});
+
+describe("pastedPaths", () => {
+  it("reads absolute paths with lines, quotes and file URLs, one per line", () => {
+    expect(pastedPaths("/a/b.ts:10-20\n  '/a/c d.ts' \nfile:///a/%E4%B8%AD.ts\n/a/dir/\n/a/e.ts:3:7")).toEqual([
+      { path: "/a/b.ts", lines: { from: 10, to: 20 } },
+      { path: "/a/c d.ts" },
+      { path: "/a/中.ts" },
+      { path: "/a/dir" },
+      { path: "/a/e.ts", lines: { from: 3, to: 3 } },
+    ]);
+    expect(pastedPaths("C:\\work\\a.ts:4")).toEqual([{ path: "C:\\work\\a.ts", lines: { from: 4, to: 4 } }]);
+    expect(pastedPaths("/a/b.ts\nnot a path")).toBeNull();
+    expect(pastedPaths("see /a/b.ts")).toBeNull();
+  });
+});
+
 describe("mergeMatches", () => {
   it("ranks folders among files by score, files first on a tie", () => {
     const merged = mergeMatches(
@@ -86,14 +140,38 @@ describe("mergeMatches", () => {
       3,
     );
     expect(merged).toEqual([
-      { path: "/p/docs", rel: "docs", dir: true, score: 70 },
-      { path: "/p/src/agents.ts", rel: "src/agents.ts", dir: false, score: 50 },
-      { path: "/p/src/agents", rel: "src/agents", dir: true, score: 50 },
+      { path: "/p/docs", rel: "docs", dir: true, score: 70, indices: [] },
+      {
+        path: "/p/src/agents.ts",
+        rel: "src/agents.ts",
+        dir: false,
+        score: 50,
+        indices: [],
+      },
+      {
+        path: "/p/src/agents",
+        rel: "src/agents",
+        dir: true,
+        score: 50,
+        indices: [],
+      },
     ]);
   });
 });
 
 describe("agent composer", () => {
+  it("leaves punctuation after a reference or command to the text", () => {
+    expect(messageTokens("in @src/a.ts:3-8, keep @src/retry/。then /review.")).toEqual([
+      { kind: "text", value: "in " },
+      { kind: "file", value: "@src/a.ts:3-8" },
+      { kind: "text", value: ", keep " },
+      { kind: "file", value: "@src/retry/" },
+      { kind: "text", value: "。then " },
+      { kind: "command", value: "/review" },
+      { kind: "text", value: "." },
+    ]);
+  });
+
   it("completes @files and /commands anywhere at a word boundary", () => {
     expect(completionAt("fix @src/le", 11)).toEqual({
       kind: "file",
@@ -186,7 +264,11 @@ describe("agent composer", () => {
     expect(toPrompt({ text: "explain @src/", files: [folder], images: [] }).files).toEqual(["/w/src"]);
     expect(toPrompt({ text: "explain @src/a.rs", files: [folder], images: [] }).files).toEqual([]);
     expect(canSend({ text: " ", files: [], images: [] })).toBe(false);
-    const video = { path: "/home/me/clip.mov", rel: "clip.mov", attached: true };
+    const video = {
+      path: "/home/me/clip.mov",
+      rel: "clip.mov",
+      attached: true,
+    };
     expect(toPrompt({ text: "what happens here?", files: [video], images: [] }).files).toEqual(["/home/me/clip.mov"]);
     expect(canSend({ text: " ", files: [video], images: [] })).toBe(true);
   });
@@ -487,16 +569,23 @@ describe("new task defaults", () => {
         description: null,
         category: id,
         current,
-        values: values.map((value) => ({ value, name: value, description: null })),
+        values: values.map((value) => ({
+          value,
+          name: value,
+          description: null,
+        })),
         via: "option",
       }) as AgentConfigOption;
     const provider = {
       id: "claude",
       config: [option("model", "sonnet", ["sonnet", "opus"]), option("mode", "default", ["default", "plan"])],
     } as unknown as Parameters<typeof draftConfig>[0];
-    const draft = { provider: "claude", config: {}, isolation: "local", base: null } as unknown as Parameters<
-      typeof draftConfig
-    >[1];
+    const draft = {
+      provider: "claude",
+      config: {},
+      isolation: "local",
+      base: null,
+    } as unknown as Parameters<typeof draftConfig>[1];
     const current = (d: typeof draft, defaults: Record<string, string>) =>
       draftConfig(provider, d, defaults).map((o) => o.current);
     expect(current(draft, { model: "opus", mode: "nope" })).toEqual(["opus", "default"]);

src/features/agents/composerCommands.test.tsx

@@ -1,4 +1,4 @@
-import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { beforeEach, describe, expect, it, vi } from "vitest";
 import { sendKeyAction } from "./Composer";
 import { act, fireEvent, render, screen, waitFor, within } from "@testing-library/react";
 import userEvent from "@testing-library/user-event";
@@ -25,7 +25,13 @@ vi.mock("@/platform/ipc", async (importOriginal) => {
     },
   };
 });
-type DragDrop = { payload: { type: string; paths?: string[]; position?: { x: number; y: number } } };
+type DragDrop = {
+  payload: {
+    type: string;
+    paths?: string[];
+    position?: { x: number; y: number };
+  };
+};
 const dragDrop = new Set<(event: DragDrop) => void>();
 vi.mock("@tauri-apps/api/webview", () => ({
   getCurrentWebview: () => ({
@@ -43,12 +49,11 @@ vi.mock("@/platform/tauriCore", async (importOriginal) => ({
 
 import { isTauri } from "@/platform/ipc";
 import { useProject } from "@/platform/project";
-import { usePlatform } from "@/platform/platformInfo";
 import type { ProjectInfo } from "@/bindings";
 import { defaultTaskProject } from "./project";
 import { HomeEditor } from "./HomeEditor";
-import composerStyles from "./Composer.module.css";
-import tagStyles from "@/ui/InlineTag.module.css";
+import chipStyles from "./ReferenceChip.module.css";
+import { textOf, typeIn } from "./composerTesting";
 import { composerDraft, HOME, updateComposer, useAgents } from "./store";
 import { emptyDraft } from "./composerModel";
 
@@ -82,14 +87,21 @@ beforeEach(() => {
   vi.mocked(isTauri).mockReturnValue(true);
   useProject.setState({ project: null });
   vcsBranches.mockReset().mockResolvedValue({ status: "ok", data: [] });
-  vcsBranchInfo
-    .mockReset()
-    .mockImplementation((root: string | null) =>
-      Promise.resolve({ status: "ok", data: { head: root === "/project-b" ? "b-main" : "a-main" } }),
-    );
+  vcsBranchInfo.mockReset().mockImplementation((root: string | null) =>
+    Promise.resolve({
+      status: "ok",
+      data: { head: root === "/project-b" ? "b-main" : "a-main" },
+    }),
+  );
   agentCommands.mockReset();
-  clipboardImage.mockReset().mockResolvedValue({ status: "ok", data: "data:image/png;base64,iVBORw0KGgo=" });
-  agentCreate.mockReset().mockResolvedValue({ status: "error", error: { kind: "invalid", message: "stop here" } });
+  clipboardImage.mockReset().mockResolvedValue({
+    status: "ok",
+    data: "data:image/png;base64,iVBORw0KGgo=",
+  });
+  agentCreate.mockReset().mockResolvedValue({
+    status: "error",
+    error: { kind: "invalid", message: "stop here" },
+  });
   useAgents.setState({
     providers: [claude],
     draft: { provider: "claude", config: {}, isolation: "local", base: null },
@@ -106,11 +118,11 @@ describe("New Task composer commands", () => {
     render(<HomeEditor />);
     await waitFor(() => expect(agentCommands).toHaveBeenCalled());
     const box = screen.getByRole("textbox");
-    fireEvent.change(box, { target: { value: "/" } });
+    typeIn(box, "/");
     await screen.findByRole("listbox", { name: "Commands" });
     for (let i = 0; i < 29; i++) fireEvent.keyDown(box, { key: "ArrowDown" });
     fireEvent.keyDown(box, { key: "Enter" });
-    expect(box).toHaveValue("/command-29 ");
+    expect(textOf(box)).toBe("/command-29 ");
   });
 
   it("groups commands before skills, skips headers, wraps and hides empty groups", async () => {
@@ -121,7 +133,7 @@ describe("New Task composer commands", () => {
     render(<HomeEditor />);
     await waitFor(() => expect(agentCommands).toHaveBeenCalled());
     const box = screen.getByRole("textbox");
-    fireEvent.change(box, { target: { value: "/" } });
+    typeIn(box, "/");
     const list = await screen.findByRole("listbox", { name: "Commands" });
     expect(
       within(list)
@@ -137,11 +149,11 @@ describe("New Task composer commands", () => {
     expect(within(list).getByRole("option", { selected: true })).toHaveTextContent("/review");
     fireEvent.keyDown(box, { key: "ArrowDown" });
     expect(within(list).getByRole("option", { selected: true })).toHaveTextContent("/compact");
-    fireEvent.change(box, { target: { value: "/tri" } });
+    typeIn(box, "/tri");
     expect(list.textContent).toBe("Skills/triage");
     fireEvent.keyDown(box, { key: "Tab" });
-    expect(box).toHaveValue("/triage ");
-    fireEvent.change(box, { target: { value: "/com" } });
+    expect(textOf(box)).toBe("/triage ");
+    typeIn(box, "/com");
     expect((await screen.findByRole("listbox", { name: "Commands" })).textContent).toBe("Commands/compact");
   });
 
@@ -154,7 +166,7 @@ describe("New Task composer commands", () => {
     expect(start.textContent).toBe("");
     expect(start).toHaveAttribute("data-tooltip", "Start");
     expect(start).toBeDisabled();
-    fireEvent.change(screen.getByRole("textbox"), { target: { value: "Do the task" } });
+    typeIn(screen.getByRole("textbox"), "Do the task");
     expect(start).toBeEnabled();
     fireEvent.click(start);
     const starting = screen.getByRole("button", { name: "Starting…" });
@@ -163,7 +175,12 @@ describe("New Task composer commands", () => {
     expect(starting).toHaveAttribute("data-tooltip", "Starting…");
     fireEvent.keyDown(screen.getByRole("textbox"), { key: "Enter" });
     expect(agentCreate).toHaveBeenCalledTimes(1);
-    await act(async () => finish({ status: "error", error: { kind: "invalid", message: "stop here" } }));
+    await act(async () =>
+      finish({
+        status: "error",
+        error: { kind: "invalid", message: "stop here" },
+      }),
+    );
     expect(screen.getByRole("button", { name: "Start" })).toBeEnabled();
   });
 
@@ -179,7 +196,7 @@ describe("New Task composer commands", () => {
     render(<HomeEditor />);
     await waitFor(() => expect(agentCommands).toHaveBeenCalledWith("claude", null));
     const box = screen.getByRole("textbox");
-    fireEvent.change(box, { target: { value: "/trig" } });
+    typeIn(box, "/trig");
     const list = await screen.findByRole("listbox", { name: "Commands" });
     const options = within(list).getAllByRole("option");
     expect(options.map((o) => o.textContent)).toEqual(["/triageOne pass over open issues and PRs"]);
@@ -188,95 +205,83 @@ describe("New Task composer commands", () => {
     expect(useAgents.getState().composers.get(HOME)?.text).toBe("/triage ");
 
     // Sent as typed, so the agent runs the skill.
-    fireEvent.change(box, { target: { value: "/triage dry-run" } });
+    typeIn(box, "/triage dry-run");
     fireEvent.keyDown(box, { key: "Enter" });
     await waitFor(() => expect(agentCreate).toHaveBeenCalled());
-    expect(agentCreate.mock.calls[0]![0]).toMatchObject({ prompt: { text: "/triage dry-run" }, provider: "claude" });
+    expect(agentCreate.mock.calls[0]![0]).toMatchObject({
+      prompt: { text: "/triage dry-run" },
+      provider: "claude",
+    });
   });
 
   it("tags file references and skills where they stand", async () => {
-    agentCommands.mockResolvedValue({ status: "ok", data: [command("triage", "One pass over issues")] });
-    render(<HomeEditor />);
-    await waitFor(() => expect(agentCommands).toHaveBeenCalled());
-    fireEvent.change(screen.getByRole("textbox"), { target: { value: "12 @Cargo.toml and /triage" } });
-    const mirror = document.querySelector(`.${composerStyles.mirror}`)!;
-    expect(within(mirror as HTMLElement).getByText("@Cargo.toml")).toHaveClass(tagStyles.tag!);
-    expect(within(mirror as HTMLElement).getByText("/triage")).toHaveClass(tagStyles.accent!);
-  });
-
-  it("offers nothing the project does not have", async () => {
-    agentCommands.mockResolvedValue({ status: "ok", data: [command("compact", "Free up context")] });
+    agentCommands.mockResolvedValue({
+      status: "ok",
+      data: [command("triage", "One pass over issues")],
+    });
     render(<HomeEditor />);
     await waitFor(() => expect(agentCommands).toHaveBeenCalled());
     const box = screen.getByRole("textbox");
-    fireEvent.change(box, { target: { value: "/trig" } });
+    typeIn(box, "12 @Cargo.toml and /triage");
+    expect(within(box).getByText("@Cargo.toml")).toHaveClass(chipStyles.pending!);
+    expect(within(box).getByText("/triage")).toHaveClass(chipStyles.command!);
+  });
+
+  it("offers nothing the project does not have", async () => {
+    agentCommands.mockResolvedValue({
+      status: "ok",
+      data: [command("compact", "Free up context")],
+    });
+    render(<HomeEditor />);
+    await waitFor(() => expect(agentCommands).toHaveBeenCalled());
+    const box = screen.getByRole("textbox");
+    typeIn(box, "/trig");
     expect(screen.queryByRole("listbox", { name: "Commands" })).toBeNull();
-    fireEvent.change(box, { target: { value: "/com" } });
+    typeIn(box, "/com");
     expect(await screen.findByRole("option")).toHaveTextContent("/compact");
   });
 
   it("completes at the caret without replacing the rest of the message", async () => {
     const user = userEvent.setup();
-    agentCommands.mockResolvedValue({ status: "ok", data: [command("compact", "Free up context")] });
+    agentCommands.mockResolvedValue({
+      status: "ok",
+      data: [command("compact", "Free up context")],
+    });
     render(<HomeEditor />);
     await waitFor(() => expect(agentCommands).toHaveBeenCalled());
     const box = screen.getByRole("textbox");
     box.focus();
-    fireEvent.change(box, { target: { value: "/com keep this context", selectionStart: 4, selectionEnd: 4 } });
+    typeIn(box, "/com keep this context", 4);
     expect(await screen.findByRole("option")).toHaveTextContent("/compact");
     expect(box).toHaveFocus();
 
     await user.keyboard("{Tab}");
-    expect(box).toHaveValue("/compact keep this context");
+    expect(textOf(box)).toBe("/compact keep this context");
     await waitFor(() => expect(screen.queryByRole("listbox", { name: "Commands" })).toBeNull());
     expect(agentCreate).not.toHaveBeenCalled();
   });
 
   it("completes a command typed after other text in place", async () => {
-    agentCommands.mockResolvedValue({ status: "ok", data: [command("triage", "One pass over open issues and PRs")] });
+    agentCommands.mockResolvedValue({
+      status: "ok",
+      data: [command("triage", "One pass over open issues and PRs")],
+    });
     render(<HomeEditor />);
     await waitFor(() => expect(agentCommands).toHaveBeenCalled());
     const box = screen.getByRole("textbox");
-    fireEvent.change(box, { target: { value: "fix the failing build /tri" } });
+    typeIn(box, "fix the failing build /tri");
     await screen.findByRole("listbox", { name: "Commands" });
     fireEvent.keyDown(box, { key: "Enter" });
     expect(useAgents.getState().composers.get(HOME)?.text).toBe("fix the failing build /triage ");
   });
 });
 
-describe("New Task composer Home / End", () => {
-  const os = usePlatform.getState().os;
-  afterEach(() => {
-    usePlatform.setState({ os });
-    vi.restoreAllMocks();
-  });
-
-  it("moves the caret to the line's start or end on macOS, extending the selection with Shift", () => {
-    usePlatform.setState({ os: "macos" });
-    const modify = vi.fn();
-    vi.spyOn(window, "getSelection").mockReturnValue({ modify } as unknown as Selection);
-    render(<HomeEditor />);
-    const box = screen.getByRole("textbox");
-    expect(fireEvent.keyDown(box, { key: "Home" })).toBe(false);
-    fireEvent.keyDown(box, { key: "End", shiftKey: true });
-    fireEvent.keyDown(box, { key: "End", metaKey: true });
-    expect(modify.mock.calls).toEqual([
-      ["move", "backward", "lineboundary"],
-      ["extend", "forward", "lineboundary"],
-    ]);
-  });
-
-  it("leaves Home / End to the text box elsewhere", () => {
-    usePlatform.setState({ os: "windows" });
-    render(<HomeEditor />);
-    expect(fireEvent.keyDown(screen.getByRole("textbox"), { key: "Home" })).toBe(true);
-  });
-});
-
 describe("New Task composer paste", () => {
   it("attaches the clipboard's image when WebKitGTK pastes an empty clipboardData", async () => {
     render(<HomeEditor />);
-    fireEvent.paste(screen.getByRole("textbox"), { clipboardData: { types: [], files: [] } });
+    fireEvent.paste(screen.getByRole("textbox"), {
+      clipboardData: { types: [], files: [] },
+    });
     await waitFor(() =>
       expect(composerDraft(HOME).images).toEqual([{ mimeType: "image/png", data: "iVBORw0KGgo=", name: "image" }]),
     );
@@ -284,7 +289,9 @@ describe("New Task composer paste", () => {
 
   it("leaves a text paste to the text box", () => {
     render(<HomeEditor />);
-    fireEvent.paste(screen.getByRole("textbox"), { clipboardData: { types: ["text/plain"], files: [] } });
+    fireEvent.paste(screen.getByRole("textbox"), {
+      clipboardData: { types: ["text/plain"], files: [] },
+    });
     expect(clipboardImage).not.toHaveBeenCalled();
   });
 });
@@ -308,7 +315,11 @@ describe("New Task composer OS file drop", () => {
     expect(composerDraft(HOME)).toEqual({
       text: "",
       files: [
-        { path: "/Users/me/Desktop/recording one.mov", rel: "recording one.mov", attached: true },
+        {
+          path: "/Users/me/Desktop/recording one.mov",
+          rel: "recording one.mov",
+          attached: true,
+        },
         { path: "/Users/me/Desktop/huge.png", rel: "huge.png", attached: true },
       ],
       images: [{ mimeType: "image/png", data: "iVBORw0KGgo=", name: "shot.png" }],
@@ -327,7 +338,11 @@ describe("workspace task project", () => {
     name: "Workspace",
     trusted: true,
     isGit: false,
-    workspace: { version: 1, name: "Workspace", projects: ["/project-a", "/project-b"] },
+    workspace: {
+      version: 1,
+      name: "Workspace",
+      projects: ["/project-a", "/project-b"],
+    },
   } as ProjectInfo;
   it("defaults to the active member, last used member, then first member", () => {
     expect(defaultTaskProject(project, "/project-b/src/main.ts", "/project-a")).toBe("/project-b");
@@ -339,7 +354,13 @@ describe("workspace task project", () => {
     vi.mocked(isTauri).mockReturnValue(false);
     useProject.setState({ project });
     agentCommands.mockResolvedValue({ status: "ok", data: [] });
-    useAgents.setState({ draft: { ...useAgents.getState().draft, projectRoot: "/project-b", isolation } });
+    useAgents.setState({
+      draft: {
+        ...useAgents.getState().draft,
+        projectRoot: "/project-b",
+        isolation,
+      },
+    });
     render(<HomeEditor />);
     const selector = screen.getByRole("button", { name: "Project" });
     expect(selector).toHaveTextContent("project-b");
@@ -348,11 +369,14 @@ describe("workspace task project", () => {
     fireEvent.click(selector);
     expect(within(screen.getByRole("listbox")).getByText("/project-a")).toBeInTheDocument();
     fireEvent.click(screen.getByRole("option", { name: /project-a/ }));
-    fireEvent.change(screen.getByRole("textbox"), { target: { value: "Update member" } });
+    typeIn(screen.getByRole("textbox"), "Update member");
     await waitFor(() => expect(screen.getByRole("button", { name: "Start" })).toBeEnabled());
     fireEvent.keyDown(screen.getByRole("textbox"), { key: "Enter" });
     await waitFor(() => expect(agentCreate).toHaveBeenCalled());
-    expect(agentCreate.mock.calls[0]![0]).toMatchObject({ projectRoot: "/project-a", isolation });
+    expect(agentCreate.mock.calls[0]![0]).toMatchObject({
+      projectRoot: "/project-a",
+      isolation,
+    });
     expect(vcsBranchInfo).toHaveBeenLastCalledWith("/project-a");
     expect(vcsBranches).toHaveBeenLastCalledWith("/project-a");
     await vi.dynamicImportSettled();

src/features/agents/composerEditor.ts

@@ -0,0 +1,245 @@
+/**
+ * The composer's CodeMirror extensions. The text stays plain (`@src/a.rs:10-20`, `/triage`,
+ * `> quote`) and is what's stored and sent; references to files of the draft are drawn as
+ * chips over their text, commands tagged, and quote lines as a block without their `>`.
+ *
+ * A chip moves and deletes as one piece. Backspace right after one turns it back into its
+ * text to edit (the completion opens on it); it folds again once the caret leaves it.
+ *
+ * A ``` block (pasted code or terminal output) is a card while the caret is outside it; a click
+ * on the card, or the caret at its end, opens it as text.
+ */
+import { EditorState, StateEffect, StateField, type Extension, type Range, type Text } from "@codemirror/state";
+import { Decoration, EditorView, WidgetType, keymap, type DecorationSet } from "@codemirror/view";
+import { fencedBlocks, isQuoteLine, messageTokens, parseMention, type FileRef, type Mention } from "./composerModel";
+import { chipElement, chipStyles, codeCardElement, openReference } from "./ReferenceChip";
+
+/** The draft's referenced files: mentions of these are chips. */
+export const setReferences = StateEffect.define<readonly FileRef[]>();
+const references = StateField.define<readonly FileRef[]>({
+  create: () => [],
+  update(value, tr) {
+    for (const e of tr.effects) if (e.is(setReferences)) return e.value;
+    return value;
+  },
+});
+
+interface Chip {
+  from: number;
+  to: number;
+  path: string;
+  mention: Mention;
+}
+
+/** `@` and `/` tokens of the line around `pos`, in document positions. */
+function lineTokens(doc: Text, pos: number) {
+  const line = doc.lineAt(pos);
+  const out: {
+    kind: "file" | "command";
+    from: number;
+    to: number;
+    value: string;
+  }[] = [];
+  let offset = line.from;
+  for (const token of messageTokens(line.text)) {
+    if (token.kind !== "text")
+      out.push({
+        kind: token.kind,
+        from: offset,
+        to: offset + token.value.length,
+        value: token.value,
+      });
+    offset += token.value.length;
+  }
+  return out;
+}
+
+const unfold = StateEffect.define<number>();
+/** Start of the chip being edited as text, while the caret stays in it. */
+const unfolded = StateField.define<number | null>({
+  create: () => null,
+  update(value, tr) {
+    for (const e of tr.effects) if (e.is(unfold)) return e.value;
+    if (value === null) return null;
+    const start = tr.changes.mapPos(value, 1);
+    const head = tr.state.selection.main.head;
+    const token = lineTokens(tr.state.doc, start).find((t) => t.from === start && t.kind === "file");
+    return token && head > token.from && head <= token.to ? start : null;
+  },
+});
+
+class ChipWidget extends WidgetType {
+  constructor(
+    readonly path: string,
+    readonly mention: Mention,
+    readonly text: string,
+  ) {
+    super();
+  }
+  eq(other: ChipWidget) {
+    return other.path === this.path && other.text === this.text;
+  }
+  toDOM() {
+    const chip = chipElement(this.path, this.mention);
+    // Keep the editor's focus and caret; a click opens the file.
+    chip.addEventListener("mousedown", (e) => e.preventDefault());
+    chip.addEventListener("click", (e) => {
+      e.stopPropagation();
+      openReference(this.path, this.mention);
+    });
+    return chip;
+  }
+  ignoreEvent() {
+    return true;
+  }
+}
+
+class CodeCardWidget extends WidgetType {
+  constructor(
+    readonly info: string,
+    readonly body: string,
+  ) {
+    super();
+  }
+  eq(other: CodeCardWidget) {
+    return other.info === this.info && other.body === this.body;
+  }
+  toDOM(view: EditorView) {
+    const range = (dom: HTMLElement) => {
+      const from = view.posAtDOM(dom);
+      return view.state.field(painted).cards.find((c) => c.from === from) ?? null;
+    };
+    const card: HTMLElement = codeCardElement(
+      this.info,
+      this.body,
+      () => {
+        const at = range(card);
+        if (at) view.dispatch({ selection: { anchor: at.to } });
+        view.focus();
+      },
+      () => {
+        const at = range(card);
+        if (!at) return;
+        const end = view.state.sliceDoc(at.to, at.to + 1) === "\n" ? at.to + 1 : at.to;
+        view.dispatch({ changes: { from: at.from, to: end }, userEvent: "delete" });
+        view.focus();
+      },
+    );
+    return card;
+  }
+  ignoreEvent() {
+    return true;
+  }
+}
+
+const quoteMarker = Decoration.replace({});
+const codeLine = Decoration.line({ class: chipStyles.codeLine });
+
+interface Painted {
+  decorations: DecorationSet;
+  atomic: DecorationSet;
+  chips: readonly Chip[];
+  cards: readonly { from: number; to: number }[];
+}
+
+function paint(state: EditorState): Painted {
+  const refs = state.field(references);
+  const editing = state.field(unfolded);
+  const decorations: Range<Decoration>[] = [];
+  const atomic: Range<Decoration>[] = [];
+  const chips: Chip[] = [];
+  const cards: { from: number; to: number }[] = [];
+  const { doc } = state;
+  const head = state.selection.main.head;
+  // Line numbers (1-based) inside ``` blocks: no chips or quotes there.
+  const coded = new Set<number>();
+  for (const fence of fencedBlocks(doc.toString().split("\n"))) {
+    const from = doc.line(fence.open + 1).from;
+    const to = doc.line(fence.close + 1).to;
+    for (let n = fence.open + 1; n <= fence.close + 1; n++) coded.add(n);
+    if (head > from && head <= to) {
+      for (let n = fence.open + 1; n <= fence.close + 1; n++) decorations.push(codeLine.range(doc.line(n).from));
+      continue;
+    }
+    const body =
+      fence.close > fence.open + 1 ? doc.sliceString(doc.line(fence.open + 2).from, doc.line(fence.close).to) : "";
+    const card = Decoration.replace({ widget: new CodeCardWidget(fence.info, body), block: true });
+    decorations.push(card.range(from, to));
+    atomic.push(card.range(from, to));
+    cards.push({ from, to });
+  }
+  for (let n = 1; n <= doc.lines; n++) {
+    if (coded.has(n)) continue;
+    const line = doc.line(n);
+    if (isQuoteLine(line.text)) {
+      const prev = n > 1 && isQuoteLine(doc.line(n - 1).text);
+      const next = n < doc.lines && isQuoteLine(doc.line(n + 1).text);
+      const cls = [chipStyles.quoteLine, !prev && chipStyles.quoteFirst, !next && chipStyles.quoteLast];
+      decorations.push(Decoration.line({ class: cls.filter(Boolean).join(" ") }).range(line.from));
+      const marker = line.text.startsWith("> ") ? 2 : 1;
+      decorations.push(quoteMarker.range(line.from, line.from + marker));
+      atomic.push(quoteMarker.range(line.from, line.from + marker));
+    }
+    for (const token of lineTokens(doc, line.from)) {
+      if (token.kind === "command") {
+        decorations.push(Decoration.mark({ class: chipStyles.command }).range(token.from, token.to));
+        continue;
+      }
+      const mention = parseMention(token.value);
+      const ref = mention && refs.find((f) => f.rel === mention.rel);
+      if (!mention || !ref || editing === token.from) {
+        decorations.push(Decoration.mark({ class: chipStyles.pending }).range(token.from, token.to));
+        continue;
+      }
+      const chip = Decoration.replace({
+        widget: new ChipWidget(ref.path, mention, token.value),
+      });
+      decorations.push(chip.range(token.from, token.to));
+      atomic.push(chip.range(token.from, token.to));
+      chips.push({ from: token.from, to: token.to, path: ref.path, mention });
+    }
+  }
+  return {
+    decorations: Decoration.set(decorations, true),
+    atomic: Decoration.set(atomic, true),
+    chips,
+    cards,
+  };
+}
+
+const painted = StateField.define<Painted>({
+  create: paint,
+  update(value, tr) {
+    // A ``` block opens while the caret is in it.
+    const fences = tr.selection && tr.state.doc.toString().includes("```");
+    const changed =
+      tr.docChanged ||
+      fences ||
+      tr.effects.some((e) => e.is(setReferences) || e.is(unfold)) ||
+      tr.startState.field(unfolded) !== tr.state.field(unfolded);
+    return changed ? paint(tr.state) : value;
+  },
+  provide: (f) => [
+    EditorView.decorations.from(f, (p) => p.decorations),
+    EditorView.atomicRanges.of((view) => view.state.field(f).atomic),
+  ],
+});
+
+/** Backspace right after a chip turns it back into its text. */
+const unfoldOnBackspace = keymap.of([
+  {
+    key: "Backspace",
+    run(view) {
+      const sel = view.state.selection.main;
+      if (!sel.empty) return false;
+      const chip = view.state.field(painted).chips.find((c) => c.to === sel.head);
+      if (!chip) return false;
+      view.dispatch({ effects: unfold.of(chip.from), userEvent: "unfold" });
+      return true;
+    },
+  },
+]);
+
+export function referenceExtensions(): Extension {
+  return [references, unfolded, painted, unfoldOnBackspace];
+}

src/features/agents/composerFolders.test.tsx

@@ -1,11 +1,19 @@
 import { beforeEach, describe, expect, it, vi } from "vitest";
-import { act, fireEvent, render, screen } from "@testing-library/react";
+import { act, fireEvent, render, screen, within } from "@testing-library/react";
+import { copySourceOf, noteCopySource } from "@/platform/clipboardSource";
+import { EditorView } from "@codemirror/view";
+import { trackEditorCopies } from "./references";
 import userEvent from "@testing-library/user-event";
+import { caretOf, setCaret, textOf, typeChars, typeIn } from "./composerTesting";
+import chipStyles from "./ReferenceChip.module.css";
 import { FILES_DRAG, dragSession } from "@/ui";
 
 const findFiles = vi.fn();
 const findDirs = vi.fn();
 const pathCompletions = vi.fn();
+const fsProbe = vi.fn();
+const fsEntryKind = vi.fn();
+const findSymbols = vi.fn();
 
 vi.mock("@/platform/ipc", async (importOriginal) => {
   const real = await importOriginal<typeof import("@/platform/ipc")>();
@@ -17,11 +25,16 @@ vi.mock("@/platform/ipc", async (importOriginal) => {
       findFiles: (query: string, limit: number) => findFiles(query, limit),
       findDirs: (query: string, limit: number) => findDirs(query, limit),
       pathCompletions: (base: string, typed: string) => pathCompletions(base, typed),
+      fsProbe: (path: string) => fsProbe(path),
+      fsEntryKind: (path: string) => fsEntryKind(path),
+      findSymbols: (query: string, filter: string, limit: number) => findSymbols(query, filter, limit),
     },
   };
 });
 
 import { Composer } from "./Composer";
+import { registerAgentContextSource } from "@/workbench/contributions";
+import { useEditorRegistry, type TextEditorHandle } from "@/editor/api";
 import { composerDraft, updateComposer } from "./store";
 import { emptyDraft, toPrompt } from "./composerModel";
 
@@ -41,15 +54,33 @@ function renderComposer(root = "/p") {
       onSubmit={() => {}}
     />,
   );
-  return screen.getByPlaceholderText("Ask") as HTMLTextAreaElement;
+  return screen.getByRole("textbox", { name: "Message" });
 }
 
 beforeEach(() => {
   updateComposer(ID, emptyDraft());
-  const match = (path: string, relPath: string, score: number) => ({ path, relPath, score, indices: [] });
+  const match = (path: string, relPath: string, score: number) => ({
+    path,
+    relPath,
+    score,
+    indices: [],
+  });
   findFiles.mockReset().mockReturnValue(ok([match("/p/src/agents.ts", "src/agents.ts", 40)]));
   findDirs.mockReset().mockReturnValue(ok([match("/p/src/agents", "src/agents/", 90)]));
   pathCompletions.mockReset().mockReturnValue(ok([{ name: "lib", dir: true }]));
+  fsEntryKind
+    .mockReset()
+    .mockImplementation((path: string) =>
+      path.startsWith("/p/")
+        ? ok(path.endsWith(".ts") ? "file" : "dir")
+        : Promise.resolve({ status: "error", error: { kind: "notFound", message: "" } }),
+    );
+  fsProbe.mockReset().mockReturnValue(
+    Promise.resolve({
+      status: "error",
+      error: { kind: "notFound", message: "" },
+    }),
+  );
 });
 
 describe("Composer dropped paths", () => {
@@ -73,7 +104,10 @@ describe("Composer dropped paths", () => {
     try {
       act(() => {
         // Folders carry a trailing slash, as the Project view marks them.
-        const drag = dragSession({ type: FILES_DRAG, payload: "/p/src/a.ts\n/p/src/dir/" });
+        const drag = dragSession({
+          type: FILES_DRAG,
+          payload: "/p/src/a.ts\n/p/src/dir/",
+        });
         expect(drag.drop(0, 0)).toBe(true);
       });
     } finally {
@@ -83,24 +117,24 @@ describe("Composer dropped paths", () => {
       { path: "/p/src/a.ts", rel: "src/a.ts" },
       { path: "/p/src/dir", rel: "src/dir" },
     ]);
-    expect(box.value).toBe("@src/a.ts @src/dir ");
+    expect(textOf(box)).toBe("@src/a.ts @src/dir ");
   });
 
   it("deduplicates live references and allows a deleted reference to be dropped again", () => {
     const box = renderComposer();
     drop(box, "/p/src/a.ts\n/p/src/a.ts\n/p/src/dir/");
     drop(box, "/p/src/a.ts\n/p/src/dir/");
-    expect(box.value).toBe("@src/a.ts @src/dir ");
-    fireEvent.change(box, { target: { value: "@src/dir " } });
+    expect(textOf(box)).toBe("@src/a.ts @src/dir ");
+    typeIn(box, "@src/dir ");
     drop(box, "/p/src/a.ts");
-    expect(box.value).toBe("@src/dir @src/a.ts ");
+    expect(textOf(box)).toBe("@src/dir @src/a.ts ");
     expect(toPrompt(composerDraft(ID)).files).toEqual(["/p/src/dir", "/p/src/a.ts"]);
   });
 
   it("maps project files and folders into the task worktree, rejecting external paths", () => {
     const box = renderComposer("/worktree");
     drop(box, "/p/src/a.ts\n/p/src/dir/\n/external/a.ts\n/p-other/a.ts\n/p/../external/b.ts\nrelative.ts");
-    expect(box.value).toBe("@src/a.ts @src/dir ");
+    expect(textOf(box)).toBe("@src/a.ts @src/dir ");
     expect(toPrompt(composerDraft(ID)).files).toEqual(["/worktree/src/a.ts", "/worktree/src/dir"]);
   });
 });
@@ -110,139 +144,349 @@ describe("Composer @ folders", () => {
     findFiles.mockReturnValue(ok([]));
     findDirs.mockReturnValue(ok([]));
     const box = renderComposer();
-    await userEvent.type(box, "@");
+    typeChars(box, "@");
     expect(await screen.findByRole("option")).toHaveTextContent("lib/");
     expect(pathCompletions).toHaveBeenCalledWith("/p/_", "");
-    await userEvent.keyboard("{Enter}");
-    expect(box.value).toBe("@lib/ ");
+    fireEvent.keyDown(box, { key: "Enter" });
+    expect(textOf(box)).toBe("@lib/ ");
     expect(toPrompt(composerDraft(ID)).files).toEqual(["/p/lib"]);
   });
 
   it("lists index folders among files and references one on Enter", async () => {
     const box = renderComposer();
-    await userEvent.type(box, "see @agen");
+    typeChars(box, "see @agen");
     const options = await screen.findAllByRole("option");
-    expect(options.map((o) => o.textContent)).toEqual(["agents/src/agents", "agents.tssrc/agents.ts"]);
-    await userEvent.keyboard("{Enter}");
-    expect(box.value).toBe("see @src/agents/ ");
+    expect(options.map((o) => o.textContent)).toEqual(["agents/src", "agents.tssrc"]);
+    fireEvent.keyDown(box, { key: "Enter" });
+    expect(textOf(box)).toBe("see @src/agents/ ");
     expect(toPrompt(composerDraft(ID)).files).toEqual(["/p/src/agents"]);
   });
 
+  it("highlights the matched characters of a file name", async () => {
+    findFiles.mockReturnValue(
+      ok([
+        {
+          path: "/p/src/agents.ts",
+          relPath: "src/agents.ts",
+          score: 40,
+          indices: [4, 5, 6],
+        },
+      ]),
+    );
+    findDirs.mockReturnValue(ok([]));
+    const box = renderComposer();
+    typeChars(box, "@age");
+    const option = await screen.findByRole("option");
+    expect([...option.querySelectorAll("mark")].map((m) => m.textContent)).toEqual(["age"]);
+  });
+
   it("keeps completing inside a folder on Tab, which drops the folder once a file is picked", async () => {
     const box = renderComposer();
-    await userEvent.type(box, "@agen");
+    typeChars(box, "@agen");
     await screen.findAllByRole("option");
-    await userEvent.keyboard("{Tab}");
-    expect(box.value).toBe("@src/agents/");
+    fireEvent.keyDown(box, { key: "Tab" });
+    expect(textOf(box)).toBe("@src/agents/");
     expect(toPrompt(composerDraft(ID)).files).toEqual(["/p/src/agents"]);
-    await userEvent.type(box, "x.ts ");
+    typeChars(box, "x.ts ");
     expect(toPrompt(composerDraft(ID)).files).toEqual([]);
   });
 
   it("references a folder of a typed path", async () => {
     const box = renderComposer();
-    await userEvent.type(box, "@./");
+    typeChars(box, "@./");
     await screen.findByRole("option");
-    await userEvent.keyboard("{Enter}");
-    expect(box.value).toBe("@./lib/ ");
+    fireEvent.keyDown(box, { key: "Enter" });
+    expect(textOf(box)).toBe("@./lib/ ");
     expect(toPrompt(composerDraft(ID)).files).toEqual(["/p/lib"]);
   });
 });
 
-describe("Composer tag editing", () => {
-  it.each(["@src/ag", "/rev"])("deletes %s character by character while it is typed", async (tag) => {
+describe("Composer reference chips", () => {
+  const chips = () => [...document.querySelectorAll<HTMLElement>("[data-ref-path]")];
+
+  it("shows a referenced file as a chip with its name and lines, and leaves the text as written", () => {
     const box = renderComposer();
-    const user = userEvent.setup();
-    await user.type(box, `see ${tag}`);
-    await user.keyboard("{Backspace}");
-    expect(box.value).toBe(`see ${tag.slice(0, -1)}`);
-    await user.keyboard("{Backspace}");
-    expect(box.value).toBe(`see ${tag.slice(0, -2)}`);
+    act(() => updateComposer(ID, { files: [{ path: "/p/src/a.ts", rel: "src/a.ts" }] }));
+    typeIn(box, "see @src/a.ts:10-20 and @other.ts ");
+    expect(chips().map((c) => [c.dataset.refPath, c.textContent])).toEqual([["/p/src/a.ts", "a.ts10–20"]]);
+    expect(chips()[0]).toHaveAccessibleName("File reference a.ts, lines 10–20");
+    // Not referenced: marked as typed.
+    expect(screen.getByText("@other.ts")).toHaveClass(chipStyles.pending!);
+    expect(textOf(box)).toBe("see @src/a.ts:10-20 and @other.ts ");
   });
 
-  it("deletes inside a folder entered with Tab character by character", async () => {
+  it("turns a chip back into its text on Backspace, and folds it again when the caret leaves", async () => {
     const box = renderComposer();
-    const user = userEvent.setup();
-    await user.type(box, "@agen");
+    typeChars(box, "see @agen");
     await screen.findAllByRole("option");
-    await user.keyboard("{Tab}");
-    expect(box.value).toBe("@src/agents/");
-    await user.keyboard("{Backspace}");
-    expect(box.value).toBe("@src/agents");
+    fireEvent.keyDown(box, { key: "Enter" });
+    expect(textOf(box)).toBe("see @src/agents/ ");
+    expect(chips()).toHaveLength(1);
+    fireEvent.keyDown(box, { key: "Backspace" });
+    expect(textOf(box)).toBe("see @src/agents/");
+    expect(chips()).toHaveLength(1);
+    // Right after the chip: it opens as text, and the completion offers it again.
+    fireEvent.keyDown(box, { key: "Backspace" });
+    expect(textOf(box)).toBe("see @src/agents/");
+    expect(chips()).toHaveLength(0);
+    fireEvent.keyDown(box, { key: "Backspace" });
+    expect(textOf(box)).toBe("see @src/agents");
+    expect(chips()).toHaveLength(0);
+    typeChars(box, "/");
+    setCaret(box, 0);
+    expect(chips()).toHaveLength(1);
   });
 
-  it("edits a completed reference character by character after its space", async () => {
+  it("moves over and deletes a chip as one piece", () => {
     const box = renderComposer();
-    const user = userEvent.setup();
-    await user.type(box, "see @agen");
-    await screen.findAllByRole("option");
-    await user.keyboard("{Enter}");
-    expect(box.value).toBe("see @src/agents/ ");
-    await user.keyboard("{Backspace}{Backspace}");
-    expect(box.value).toBe("see @src/agents");
+    act(() => updateComposer(ID, { files: [{ path: "/p/src/a.ts", rel: "src/a.ts" }] }));
+    typeIn(box, "see @src/a.ts next", 4);
+    fireEvent.keyDown(box, { key: "Delete" });
+    expect(textOf(box)).toBe("see  next");
   });
 
-  it.each(["@src/a.ts", "/review"])("edits %s after moving away and returning", async (tag) => {
+  it("deletes a reference that names no file character by character", () => {
     const box = renderComposer();
+    typeIn(box, "see @src/a.ts next", 13);
+    fireEvent.keyDown(box, { key: "Backspace" });
+    expect(textOf(box)).toBe("see @src/a.t next");
+    expect(caretOf(box)).toBe(12);
+  });
+});
+
+describe("Composer quotes", () => {
+  it("draws quote lines as a block without their marker", () => {
+    const box = renderComposer();
+    typeIn(box, "> first\n> second\n\nreply");
+    const lines = [...box.querySelectorAll(".cm-line")];
+    expect(lines.map((l) => l.textContent)).toEqual(["first", "second", "", "reply"]);
+    expect(lines.map((l) => l.classList.contains(chipStyles.quoteLine!))).toEqual([true, true, false, false]);
+    expect(textOf(box)).toBe("> first\n> second\n\nreply");
+  });
+});
+
+describe("Composer editing", () => {
+  it("offers no completion while the input method composes", () => {
+    const box = renderComposer();
+    fireEvent.compositionStart(box);
+    typeIn(box, "@中文");
+    expect(screen.queryByRole("listbox")).toBeNull();
+    fireEvent.compositionEnd(box);
+    expect(textOf(box)).toBe("@中文");
+  });
+
+  it("pastes plain text as text", async () => {
+    const box = renderComposer();
+    const user = userEvent.setup();
+    act(() => box.focus());
+    await user.paste("look @src/a.ts\nthen /review please");
+    expect(textOf(box)).toBe("look @src/a.ts\nthen /review please");
+  });
+
+  it("references a pasted path of a project file, with its lines", async () => {
+    const box = renderComposer();
     const user = userEvent.setup();
-    fireEvent.change(box, { target: { value: `see ${tag} next` } });
-    box.focus();
-    box.setSelectionRange(0, 0);
-    fireEvent.select(box);
-    box.blur();
-    box.focus();
-    box.setSelectionRange(4 + tag.length, 4 + tag.length);
-    fireEvent.select(box);
-    await user.keyboard("{Backspace}");
-    expect(box.value).toBe(`see ${tag.slice(0, -1)} next`);
-    expect(box.selectionStart).toBe(3 + tag.length);
+    act(() => box.focus());
+    await user.paste("/p/src/a.ts:3-5");
+    await vi.waitFor(() => expect(textOf(box)).toBe("@src/a.ts:3-5 "));
+    expect(toPrompt(composerDraft(ID)).files).toEqual(["/p/src/a.ts"]);
+    await user.paste("/elsewhere/b.ts");
+    expect(textOf(box)).toBe("@src/a.ts:3-5 /elsewhere/b.ts");
   });
 
-  it.each(["@src/a.ts", "/review"])("moves within %s with the arrow keys", async (tag) => {
+  it("references pasted folders, several paths and file URLs", async () => {
     const box = renderComposer();
     const user = userEvent.setup();
-    fireEvent.change(box, { target: { value: `see ${tag} next` } });
-    box.focus();
-    box.setSelectionRange(4, 4);
-    await user.keyboard("{ArrowRight}");
-    expect(box.selectionStart).toBe(5);
-    await user.keyboard("{ArrowLeft}");
-    expect(box.selectionStart).toBe(4);
-    await user.keyboard("{Delete}");
-    expect(box.value).toBe(`see ${tag.slice(1)} next`);
+    act(() => box.focus());
+    await user.paste("/p/src/dir\n'/p/src/b.ts'\nfile:///p/src/c.ts");
+    await vi.waitFor(() => expect(textOf(box)).toBe("@src/dir/ @src/b.ts @src/c.ts "));
+    expect(toPrompt(composerDraft(ID)).files).toEqual(["/p/src/dir", "/p/src/b.ts", "/p/src/c.ts"]);
   });
 
-  it.each(["@src/a.ts", "/review"])("selects and deletes only part of %s", async (tag) => {
+  it("pastes a path that is gone, or holds a space, as text", async () => {
     const box = renderComposer();
     const user = userEvent.setup();
-    fireEvent.change(box, { target: { value: `see ${tag} next` } });
-    box.focus();
-    box.setSelectionRange(5, 7);
-    fireEvent.select(box);
-    await user.keyboard("{Backspace}");
-    expect(box.value).toBe(`see ${tag.slice(0, 1)}${tag.slice(3)} next`);
+    act(() => box.focus());
+    await user.paste("/p/my dir/a.ts");
+    expect(textOf(box)).toBe("/p/my dir/a.ts");
+    fsEntryKind.mockReturnValue(Promise.resolve({ status: "error", error: { kind: "notFound", message: "" } }));
+    await user.paste(" /p/gone.ts");
+    await vi.waitFor(() => expect(textOf(box)).toBe("/p/my dir/a.ts /p/gone.ts"));
+  });
+});
+
+describe("Composer current file", () => {
+  it("offers the focused editor's file until the draft references it", () => {
+    const view = {} as TextEditorHandle["view"];
+    act(() =>
+      useEditorRegistry.setState({ active: { view, ctx: { path: "/p/src/main.ts" } as TextEditorHandle["ctx"] } }),
+    );
+    try {
+      renderComposer();
+      const offer = screen.getByRole("button", { name: /main\.ts/ });
+      expect(offer).toHaveTextContent("Current File");
+      fireEvent.click(offer);
+      expect(composerDraft(ID).text).toBe("@src/main.ts ");
+      expect(toPrompt(composerDraft(ID)).files).toEqual(["/p/src/main.ts"]);
+      expect(screen.queryByRole("button", { name: /main\.ts/ })).toBeNull();
+      expect(document.querySelector("[data-ref-path]")).toHaveAttribute("data-ref-path", "/p/src/main.ts");
+    } finally {
+      act(() => useEditorRegistry.setState({ active: null }));
+    }
+  });
+});
+
+describe("Composer pasted code and terminal output", () => {
+  const paste = (box: HTMLElement, text: string) =>
+    act(() => {
+      const event = new Event("paste", { bubbles: true, cancelable: true }) as ClipboardEvent;
+      Object.defineProperty(event, "clipboardData", {
+        value: { files: [], types: ["text/plain"], getData: () => text },
+      });
+      box.dispatchEvent(event);
+    });
+
+  it("turns terminal output into a terminal card, and opens it as text when the caret enters it", () => {
+    const box = renderComposer();
+    typeIn(box, "why does this fail?");
+    noteCopySource("$ pnpm test\nFAIL a.test.ts\n  expected 1", { kind: "terminal", title: "zsh" });
+    paste(box, "$ pnpm test\nFAIL a.test.ts\n  expected 1\n");
+    expect(textOf(box)).toBe("why does this fail?\n```terminal zsh\n$ pnpm test\nFAIL a.test.ts\n  expected 1\n```\n");
+    const card = screen.getByRole("group", { name: "Terminal · zsh" });
+    expect(card).toHaveTextContent("3 lines");
+    expect(card.querySelector("pre")).toHaveTextContent("$ pnpm test");
+    fireEvent.click(card);
+    expect(screen.queryByRole("group")).toBeNull();
+    expect(box.querySelectorAll(`.${chipStyles.codeLine}`)).toHaveLength(5);
+  });
+
+  it("removes a card with its button", () => {
+    const box = renderComposer();
+    typeIn(box, "```ts\nconst a = 1;\n```\nnext");
+    fireEvent.click(within(screen.getByRole("group", { name: "TypeScript" })).getByRole("button", { name: "Remove" }));
+    expect(textOf(box)).toBe("next");
+  });
+
+  it("references the lines copied from an editor, and pastes a copied single line as text", () => {
+    const box = renderComposer();
+    noteCopySource("fn a() {\n}", { kind: "file", path: "/p/src/a.rs", from: 3, to: 4 });
+    paste(box, "fn a() {\n}");
+    expect(textOf(box)).toBe("@src/a.rs:3-4 ");
+    expect(toPrompt(composerDraft(ID)).files).toEqual(["/p/src/a.rs"]);
+    noteCopySource("fn a()", { kind: "file", path: "/p/src/a.rs", from: 3, to: 3 });
+    paste(box, "fn a()");
+    expect(textOf(box)).toBe("@src/a.rs:3-4 fn a()");
+  });
+
+  it("pastes a stack trace as a card, its project lines as references after it", async () => {
+    const box = renderComposer();
+    const trace = "TypeError: boom\n    at run (/p/src/a.ts:12:5)\n    at main (/elsewhere/x.ts:3:1)";
+    paste(box, trace);
+    expect(screen.getByRole("group", { name: "Stack Trace" })).toHaveTextContent("3 lines");
+    await vi.waitFor(() => expect(textOf(box)).toBe(`\`\`\`trace\n${trace}\n\`\`\`\n@src/a.ts:12 `));
+    expect(toPrompt(composerDraft(ID)).files).toEqual(["/p/src/a.ts"]);
+  });
+
+  it("folds long pasted text into a card", () => {
+    const box = renderComposer();
+    const long = Array.from({ length: 40 }, (_, i) => `row ${i}`).join("\n");
+    paste(box, long);
+    expect(screen.getByRole("group", { name: "Pasted Text" })).toHaveTextContent("40 lines");
+    expect(textOf(box)).toBe(`\`\`\`text\n${long}\n\`\`\`\n`);
   });
 
-  it("leaves IME keys and composition text to the input method", () => {
+  it("pastes other text as written", () => {
     const box = renderComposer();
-    fireEvent.change(box, { target: { value: "@src/a.ts" } });
-    const before = box.value;
-    box.setSelectionRange(before.length, before.length);
-    expect(fireEvent.keyDown(box, { key: "Backspace", isComposing: true })).toBe(true);
-    expect(fireEvent.keyDown(box, { key: "Backspace", keyCode: 229 })).toBe(true);
-    fireEvent.compositionStart(box);
-    fireEvent.change(box, { target: { value: "@中文" } });
-    expect(screen.queryByRole("listbox")).toBeNull();
-    expect(fireEvent.keyDown(box, { key: "Enter" })).toBe(true);
-    fireEvent.compositionEnd(box);
-    expect(box.value).toBe("@中文");
+    noteCopySource("something else", { kind: "terminal", title: "zsh" });
+    paste(box, "line one\nline two");
+    expect(textOf(box)).toBe("line one\nline two");
+  });
+});
+
+describe("editor copies", () => {
+  it("notes the copied lines of a file editor, or the caret's line when nothing is selected", () => {
+    const view = new EditorView({
+      doc: "one\ntwo\nthree\nfour",
+      parent: document.body,
+      selection: { anchor: 4, head: 14 },
+    });
+    const handle = { view, ctx: { path: "/p/src/a.ts" } } as TextEditorHandle;
+    act(() => useEditorRegistry.setState({ editors: new Set([handle]) }));
+    const stop = trackEditorCopies();
+    try {
+      view.contentDOM.dispatchEvent(new Event("copy", { bubbles: true }));
+      expect(copySourceOf("two\nthree\n")).toEqual({ kind: "file", path: "/p/src/a.ts", from: 2, to: 3 });
+      view.dispatch({ selection: { anchor: 15 } });
+      view.contentDOM.dispatchEvent(new Event("copy", { bubbles: true }));
+      expect(copySourceOf("four")).toEqual({ kind: "file", path: "/p/src/a.ts", from: 4, to: 4 });
+    } finally {
+      stop();
+      view.destroy();
+      act(() => useEditorRegistry.setState({ editors: new Set() }));
+    }
+  });
+});
+
+describe("Composer @ context and symbols", () => {
+  it("offers what features contribute above the files and inserts it", async () => {
+    const off = [
+      registerAgentContextSource({
+        id: "problems",
+        title: "Problems",
+        description: "The project's errors and warnings",
+        icon: "problems",
+        resolve: async () => ({ kind: "block", info: "problems", text: "src/a.ts:3:1: error: nope" }),
+      }),
+      registerAgentContextSource({
+        id: "changes",
+        title: "Changes",
+        description: "Files with uncommitted changes",
+        icon: "diff",
+        resolve: async () => ({ kind: "files", paths: ["/p/src/a.ts", "/p/src/b.ts", "/elsewhere/c.ts"] }),
+      }),
+    ];
+    try {
+      const box = renderComposer();
+      typeChars(box, "fix @pro");
+      const options = await screen.findAllByRole("option");
+      expect(options[0]).toHaveTextContent("@problems");
+      fireEvent.keyDown(box, { key: "Enter" });
+      await vi.waitFor(() =>
+        expect(textOf(box)).toBe("fix\n```problems\nsrc/a.ts:3:1: error: nope\n```\n@src/a.ts:3 "),
+      );
+      expect(screen.getByRole("group", { name: "Problems" })).toBeInTheDocument();
+      typeChars(box, "@chan");
+      await screen.findAllByRole("option");
+      fireEvent.keyDown(box, { key: "Enter" });
+      await vi.waitFor(() => expect(textOf(box)).toMatch(/@src\/a\.ts:3 @src\/a\.ts @src\/b\.ts $/));
+      expect(toPrompt(composerDraft(ID)).files).toEqual(["/p/src/a.ts", "/p/src/b.ts"]);
+    } finally {
+      off.forEach((d) => d());
+    }
   });
 
-  it("pastes plain text through the native textarea", async () => {
+  it("references a symbol's file and line with @#", async () => {
+    findSymbols.mockReturnValue(
+      ok([
+        {
+          name: "fetchUser",
+          kind: "function",
+          container: "client",
+          path: "/p/src/api/client.ts",
+          relPath: "src/api/client.ts",
+          range: { start: { line: 11, col: 0 }, end: { line: 11, col: 9 } },
+          score: 10,
+          indices: [0, 1, 2],
+        },
+      ]),
+    );
     const box = renderComposer();
-    const user = userEvent.setup();
-    box.focus();
-    await user.paste("look @src/a.ts\nthen /review please");
-    expect(box.value).toBe("look @src/a.ts\nthen /review please");
+    typeChars(box, "@#fet");
+    const option = await screen.findByRole("option");
+    expect(option).toHaveTextContent("fetchUserclient · src/api/client.ts:12");
+    expect(findSymbols).toHaveBeenCalledWith("fet", "all", 12);
+    fireEvent.keyDown(box, { key: "Enter" });
+    expect(textOf(box)).toBe("@src/api/client.ts:12 ");
+    expect(toPrompt(composerDraft(ID)).files).toEqual(["/p/src/api/client.ts"]);
   });
 });

src/features/agents/composerModel.ts

@@ -27,19 +27,26 @@ export interface ComposerDraft {
   images: AgentImage[];
 }
 
-export const emptyDraft = (): ComposerDraft => ({ text: "", files: [], images: [] });
+export const emptyDraft = (): ComposerDraft => ({
+  text: "",
+  files: [],
+  images: [],
+});
 
 export type MessageToken = { kind: "text" | "file" | "command"; value: string };
 
 /**
  * A message's text split into plain runs, `@file` references and `/command` skills. A
  * command is a `/word` at the start or after whitespace; a reference likewise after `@`.
+ * Punctuation that ends either belongs to the text.
  */
 export function messageTokens(text: string): MessageToken[] {
   const out: MessageToken[] = [];
   let last = 0;
-  for (const match of text.matchAll(/(^|\s)([@/][^\s@]+)/g)) {
-    const token = match[2]!;
+  // Full-width punctuation ends one too, as Chinese text runs on without a space after it.
+  for (const match of text.matchAll(/(^|\s)([@/][^\s@，。；：！？、（）【】《》「」『』]+)/g)) {
+    // Punctuation after it ends the sentence, not the path: "see @a.ts, then /review."
+    const token = match[2]!.replace(/^(.+?)[,.;:!?)\]}>'"，。；：！？、）】》」』]+$/, "$1");
     const start = match.index! + match[1]!.length;
     const command = /^\/[A-Za-z][\w:.-]*$/.test(token);
     if (token.startsWith("/") && !command) continue;
@@ -61,7 +68,12 @@ export function completionAt(text: string, caret: number): Completion | null {
   const word = /(^|\s)([@/])([^\s@]*)$/.exec(before);
   if (!word) return null;
   const from = caret - word[3]!.length - 1;
-  return { kind: word[2] === "/" ? "command" : "file", query: word[3]!, from, to: caret };
+  return {
+    kind: word[2] === "/" ? "command" : "file",
+    query: word[3]!,
+    from,
+    to: caret,
+  };
 }
 
 /** Replaces the completion with `insert` plus a space; returns the text and the caret after it. */
@@ -119,6 +131,8 @@ interface IndexMatch {
   path: string;
   relPath: string;
   score: number;
+  /** Matched characters of `relPath`. */
+  indices?: number[];
 }
 
 /**
@@ -129,15 +143,170 @@ export function mergeMatches(
   files: readonly IndexMatch[],
   dirs: readonly IndexMatch[],
   limit: number,
-): { path: string; rel: string; dir: boolean; score: number }[] {
+): {
+  path: string;
+  rel: string;
+  dir: boolean;
+  score: number;
+  indices: number[];
+}[] {
   return [
-    ...files.map((f) => ({ path: f.path, rel: f.relPath, dir: false, score: f.score })),
-    ...dirs.map((d) => ({ path: d.path, rel: d.relPath.replace(/\/$/, ""), dir: true, score: d.score })),
+    ...files.map((f) => ({
+      path: f.path,
+      rel: f.relPath,
+      dir: false,
+      score: f.score,
+      indices: f.indices ?? [],
+    })),
+    ...dirs.map((d) => ({
+      path: d.path,
+      rel: d.relPath.replace(/\/$/, ""),
+      dir: true,
+      score: d.score,
+      indices: d.indices ?? [],
+    })),
   ]
     .sort((a, b) => b.score - a.score || Number(a.dir) - Number(b.dir))
     .slice(0, limit);
 }
 
+export interface Mention {
+  /** As written after `@`; a folder keeps its trailing `/`. */
+  rel: string;
+  dir: boolean;
+  /** 1-based lines, when the mention names a range. */
+  lines?: { from: number; to: number };
+}
+
+/** `@src/a.rs:10-20` → its path and lines; `null` for an empty `@`. */
+export function parseMention(token: string): Mention | null {
+  const m = /^@(.+?)(?::(\d+)(?:-(\d+))?)?$/.exec(token);
+  if (!m) return null;
+  const rel = m[1]!;
+  const from = m[2] ? Number(m[2]) : undefined;
+  const lines = from === undefined ? undefined : { from, to: m[3] ? Math.max(from, Number(m[3])) : from };
+  return { rel, dir: rel.endsWith("/"), ...(lines && { lines }) };
+}
+
+/** "10" or "10–20". */
+export const linesLabel = (lines: { from: number; to: number }) =>
+  lines.from === lines.to ? String(lines.from) : `${lines.from}–${lines.to}`;
+
+/** Lines of `text` that start with `>`: a quoted reply or selection, drawn as a block. */
+export const isQuoteLine = (line: string) => /^>( |$)/.test(line);
+
+export interface Fence {
+  /** Line indexes (0-based) of the opening and the closing fence. */
+  open: number;
+  close: number;
+  /** After the opening fence: a language, or `terminal <title>`. */
+  info: string;
+}
+
+/** The closed ``` blocks among `lines`. */
+export function fencedBlocks(lines: readonly string[]): Fence[] {
+  const out: Fence[] = [];
+  for (let i = 0; i < lines.length; i++) {
+    const open = /^(`{3,})([^`]*)$/.exec(lines[i]!);
+    if (!open) continue;
+    const ticks = open[1]!.length;
+    const close = lines.findIndex((l, j) => j > i && new RegExp(`^\`{${ticks},}\\s*$`).test(l));
+    if (close < 0) break;
+    out.push({ open: i, close, info: open[2]!.trim() });
+    i = close;
+  }
+  return out;
+}
+
+/** `text` as a ``` block on its own lines, fenced longer than any run of backticks in it. */
+export function fenced(text: string, info: string): string {
+  const longest = Math.max(2, ...[...text.matchAll(/`+/g)].map((m) => m[0].length));
+  const fence = "`".repeat(longest + 1);
+  return `${fence}${info}\n${text.replace(/\r\n?/g, "\n").replace(/\s+$/, "")}\n${fence}`;
+}
+
+export type FenceKind = "terminal" | "problems" | "trace" | "text" | "code";
+
+/**
+ * A block's kind and label: `terminal zsh` → a terminal named zsh, `problems`, `trace` (an
+ * error's stack), `text` (a long paste); anything else is code in that language (`ts`).
+ */
+export function fenceLabel(info: string): { kind: FenceKind; label: string; language: string | null } {
+  const [first = "", ...rest] = info.split(/\s+/);
+  if (first === "terminal" || first === "problems" || first === "trace" || first === "text")
+    return { kind: first, label: rest.join(" "), language: null };
+  return { kind: "code", label: info, language: first || null };
+}
+
+/** An error's stack trace or a crash: pasted as a block, its project lines as references. */
+export function looksLikeTrace(text: string): boolean {
+  if (!text.trim().includes("\n")) return false;
+  return [
+    /^\s+at\s+\S/m, // JavaScript, Java, C#
+    /^Traceback \(most recent call last\)/m,
+    /^\s*File ".+", line \d+/m,
+    /panicked at /,
+    /^goroutine \d+ \[/m,
+    /^\s*\d+: .+\n\s+at \S+:\d+/m, // Rust backtrace
+    /^(?:Uncaught |Unhandled )?[\w.$]*(?:Error|Exception)\b.*\n\s+(?:at|File|in) /m,
+  ].some((re) => re.test(text));
+}
+
+/** Long pasted text goes in as a block rather than filling the box. */
+export const LONG_PASTE_LINES = 30;
+
+/**
+ * `path:line` places in output (`src/a.ts:12`, `/abs/a.go:34:5`, `(a.js:3:9)`,
+ * `File "a.py", line 7`), each once, at most `limit`, dependency paths left out.
+ */
+export function placesInText(text: string, limit = 8): { path: string; line: number }[] {
+  const out: { path: string; line: number }[] = [];
+  const seen = new Set<string>();
+  const add = (raw: string, line: string) => {
+    const path = raw.replace(/^file:\/\//, "");
+    if (/(^|[\\/])(node_modules|site-packages|\.cargo|\.rustup|go[\\/]pkg[\\/]mod)[\\/]/.test(path)) return;
+    const key = `${path}:${line}`;
+    if (seen.has(key) || out.length >= limit) return;
+    seen.add(key);
+    out.push({ path, line: Number(line) });
+  };
+  for (const m of text.matchAll(/File "([^"]+)", line (\d+)/g)) add(m[1]!, m[2]!);
+  for (const m of text.matchAll(/(?:file:\/\/)?((?:[A-Za-z]:)?[\w.@+\-\\/]*[\w-]\.[A-Za-z0-9]{1,8}):(\d+)(?::\d+)?/g))
+    add(m[1]!, m[2]!);
+  return out;
+}
+
+/**
+ * Pasted absolute paths, one per line (`/abs/a.rs`, `/abs/a.rs:10-20`, `/abs/a.rs:10:5`,
+ * quoted, or `file://` URLs); `null` when any line is something else.
+ */
+export function pastedPaths(text: string): { path: string; lines?: { from: number; to: number } }[] | null {
+  const rows = text
+    .split(/\r?\n/)
+    .map((l) => l.trim())
+    .filter(Boolean);
+  if (!rows.length) return null;
+  const out: { path: string; lines?: { from: number; to: number } }[] = [];
+  for (let row of rows) {
+    row = row.replace(/^(["'])(.*)\1$/, "$2");
+    if (row.startsWith("file://")) {
+      try {
+        row = decodeURIComponent(new URL(row).pathname).replace(/^\/([A-Za-z]:)/, "$1");
+      } catch {
+        return null;
+      }
+    }
+    const m = /^((?:\/|[A-Za-z]:[\\/]).*?)(?::(\d+)(?:(?:-(\d+))|(?::\d+))?)?$/.exec(row);
+    if (!m) return null;
+    const from = m[2] ? Number(m[2]) : undefined;
+    out.push({
+      path: m[1]!.replace(/[\\/]+$/, "") || m[1]!,
+      ...(from !== undefined && { lines: { from, to: m[3] ? Math.max(from, Number(m[3])) : from } }),
+    });
+  }
+  return out;
+}
+
 /** `@rel` with a line range suffix when given ("@src/a.rs:10-20"). */
 export function mentionOf(rel: string, lines?: { from: number; to: number }): string {
   if (!lines) return `@${rel}`;
@@ -156,7 +325,11 @@ export function toPrompt(draft: ComposerDraft): AgentPrompt {
     seen.add(f.path);
     return true;
   });
-  return { text: draft.text.trim(), files: files.map((f) => f.path), images: draft.images };
+  return {
+    text: draft.text.trim(),
+    files: files.map((f) => f.path),
+    images: draft.images,
+  };
 }
 
 export const canSend = (d: ComposerDraft) => !!d.text.trim() || d.images.length > 0 || d.files.some((f) => f.attached);
@@ -255,7 +428,11 @@ export function retryParts(r: AgentRetry, now: number): { attempt: string; wait:
 }
 
 /** "167k/1M (17%)" of the context window and a tooltip with the exact counts. */
-export function usageLabel(u: AgentUsage): { short: string; percent: number; detail: string } {
+export function usageLabel(u: AgentUsage): {
+  short: string;
+  percent: number;
+  detail: string;
+} {
   const percent = Math.min(100, Math.round((u.used / u.size) * 100));
   return {
     short: `${tokens(u.used)}/${tokens(u.size)} (${percent}%)`,
@@ -278,9 +455,18 @@ export function limitLabel(l: AgentLimit, now: number): { short: string; percent
   const percent = Math.min(100, Math.round(l.usedPercent ?? 0));
   const name = known ? tx(known.name) : l.window;
   const used = tx`${name}: ${percent}% used`;
-  if (l.resetsMs == null) return { short: `${known?.short ?? l.window} ${percent}%`, percent, detail: used };
+  if (l.resetsMs == null)
+    return {
+      short: `${known?.short ?? l.window} ${percent}%`,
+      percent,
+      detail: used,
+    };
   const reset = untilReset(Math.max(0, l.resetsMs - now));
-  return { short: `${known?.short ?? l.window} ${percent}%`, percent, detail: tx`${used}, resets in ${reset}` };
+  return {
+    short: `${known?.short ?? l.window} ${percent}%`,
+    percent,
+    detail: tx`${used}, resets in ${reset}`,
+  };
 }
 
 /** `45m`, `2h 51m`, `5d 3h`. */
@@ -295,7 +481,10 @@ function untilReset(ms: number): string {
 /** "$0.42": what the session has cost so far. */
 export function costLabel(c: AgentCost): string {
   try {
-    return new Intl.NumberFormat("en-US", { style: "currency", currency: c.currency }).format(c.amount ?? 0);
+    return new Intl.NumberFormat("en-US", {
+      style: "currency",
+      currency: c.currency,
+    }).format(c.amount ?? 0);
   } catch {
     // Not an ISO 4217 code.
     return `${(c.amount ?? 0).toFixed(2)} ${c.currency}`;

src/features/agents/composerTesting.ts

@@ -0,0 +1,53 @@
+/** Test helpers for the composer's editor (a CodeMirror view); plain text areas work too. */
+import { act, fireEvent } from "@testing-library/react";
+import { EditorView } from "@codemirror/view";
+
+function viewOf(box: HTMLElement): EditorView {
+  const view = EditorView.findFromDOM(box);
+  if (!view) throw new Error("not a composer editor");
+  return view;
+}
+
+/** Replaces the composer's text as typing would, caret at `caret` (the end by default). */
+export function typeIn(box: HTMLElement, value: string, caret = value.length) {
+  if (box instanceof HTMLTextAreaElement) {
+    fireEvent.change(box, {
+      target: { value, selectionStart: caret, selectionEnd: caret },
+    });
+    return;
+  }
+  const view = viewOf(box);
+  act(() => {
+    view.focus();
+    view.dispatch({
+      changes: { from: 0, to: view.state.doc.length, insert: value },
+      selection: { anchor: caret },
+      userEvent: "input.type",
+    });
+  });
+}
+
+/** Types `chars` at the caret, one at a time. */
+export function typeChars(box: HTMLElement, chars: string) {
+  const view = viewOf(box);
+  act(() => view.focus());
+  for (const ch of chars)
+    act(() => {
+      view.dispatch(view.state.replaceSelection(ch), {
+        userEvent: "input.type",
+      });
+    });
+}
+
+export const textOf = (box: HTMLElement) =>
+  box instanceof HTMLTextAreaElement ? box.value : viewOf(box).state.doc.toString();
+
+export const caretOf = (box: HTMLElement) => viewOf(box).state.selection.main.head;
+
+export function setCaret(box: HTMLElement, anchor: number, head = anchor) {
+  const view = viewOf(box);
+  act(() => {
+    view.focus();
+    view.dispatch({ selection: { anchor, head } });
+  });
+}

src/features/agents/index.ts

@@ -9,7 +9,9 @@ import { useProject } from "@/platform/project";
 import { executeAction } from "@/platform/actions";
 import { lazyComponent } from "@/ui";
 import { isVirtualUri } from "@/platform/virtualDocs";
+import { call, commands } from "@/platform/ipc";
 import {
+  registerAgentContextSource,
   registerEditorDropHandler,
   registerEditorKind,
   registerMenuGroup,
@@ -30,7 +32,7 @@ import {
   TOOL_WINDOW,
   providerIcon,
 } from "./model";
-import { sendPaths, sendSelection } from "./references";
+import { sendPaths, sendSelection, trackEditorCopies } from "./references";
 import { focusedSession } from "./sessionFocus";
 import { closeActiveTask, closeAndNewTask, connect, disconnect, openHome, refreshProviders, useAgents } from "./store";
 import { TaskStatusMark } from "./TaskStatusMark";
@@ -77,6 +79,17 @@ export function activate(): () => void {
   sync(useProject.getState().project?.root);
   const disposers = [
     activateSettingsPages(),
+    trackEditorCopies(),
+    registerAgentContextSource({
+      id: "changes",
+      title: "Changes",
+      description: "Files with uncommitted changes",
+      icon: "diff",
+      resolve: async () => {
+        const changed = await call(commands.vcsStatus());
+        return changed.length ? { kind: "files", paths: changed.map((f) => f.path) } : null;
+      },
+    }),
     // The performance harness (`perf/`): long conversations to switch between and scroll.
     import.meta.env.DEV || import.meta.env.MODE === "perf"
       ? registerActions([

src/features/agents/messageEditing.test.tsx

@@ -3,10 +3,22 @@ import { act, fireEvent, render, screen, waitFor } from "@testing-library/react"
 import userEvent from "@testing-library/user-event";
 import type { AgentEntry, AgentTask } from "@/bindings";
 
-const ipc = vi.hoisted(() => ({ rollback: vi.fn(), prompt: vi.fn(), cancel: vi.fn(), confirm: vi.fn() }));
+const ipc = vi.hoisted(() => ({
+  rollback: vi.fn(),
+  prompt: vi.fn(),
+  cancel: vi.fn(),
+  confirm: vi.fn(),
+}));
 vi.mock("@/workbench/messages", () => ({ confirm: ipc.confirm }));
 const entries: AgentEntry[] = [
-  { type: "user", text: "Original message", attachments: [], sentMs: 1, doneMs: 2, steered: false },
+  {
+    type: "user",
+    text: "Original message",
+    attachments: [],
+    sentMs: 1,
+    doneMs: 2,
+    steered: false,
+  },
   { type: "agent", text: "Original answer" },
 ];
 
@@ -15,7 +27,10 @@ vi.mock("@/platform/ipc", async (original) => ({
   commands: {
     agentEntries: async () => ({ status: "ok", data: entries }),
     agentChanges: async () => ({ status: "ok", data: [] }),
-    agentGroupedChanges: async () => ({ status: "ok", data: { uncommitted: [], commits: [] } }),
+    agentGroupedChanges: async () => ({
+      status: "ok",
+      data: { uncommitted: [], commits: [] },
+    }),
     vcsBranchInfo: async () => ({ status: "ok", data: { head: "main" } }),
     agentRollback: ipc.rollback,
     agentPrompt: ipc.prompt,
@@ -23,10 +38,13 @@ vi.mock("@/platform/ipc", async (original) => ({
   },
 }));
 vi.mock("@tauri-apps/api/webview", () => ({
-  getCurrentWebview: () => ({ onDragDropEvent: () => Promise.resolve(() => {}) }),
+  getCurrentWebview: () => ({
+    onDragDropEvent: () => Promise.resolve(() => {}),
+  }),
 }));
 
 import { SessionEditor } from "./SessionEditor";
+import { textOf, typeIn } from "./composerTesting";
 import { registerActions } from "@/platform/actions";
 import { composerDraft, retractFrom, rerunFrom, sendMessage, updateComposer, useAgents } from "./store";
 import { replyActions } from "./replyActions";
@@ -92,7 +110,9 @@ it("keeps the transcript and running session when a fresh-session rerun is cance
 describe("retracting a turn", () => {
   it.each([0, 1])("stops before rollback and restores text/images without sending (turn %s)", async (turn) => {
     const image = { mimeType: "image/png", data: "AAA", name: "shot.png" };
-    useAgents.setState({ tasks: new Map([[task.id, { ...task, status: "running" }]]) });
+    useAgents.setState({
+      tasks: new Map([[task.id, { ...task, status: "running" }]]),
+    });
     updateComposer(task.id, { text: "Draft" });
     const running = retractFrom(task.id, turn, "Original", [image]);
     await waitFor(() => expect(ipc.cancel).toHaveBeenCalledTimes(1));
@@ -101,14 +121,20 @@ describe("retracting a turn", () => {
     await running;
     expect(ipc.rollback).toHaveBeenCalledExactlyOnceWith(task.id, turn);
     expect(ipc.prompt).not.toHaveBeenCalled();
-    expect(composerDraft(task.id)).toEqual({ text: "Original\nDraft", images: [image], files: [] });
+    expect(composerDraft(task.id)).toEqual({
+      text: "Original\nDraft",
+      images: [image],
+      files: [],
+    });
     expect(useAgents.getState().focus?.key).toBe(task.id);
   });
 
   it("keeps the draft and avoids rollback when the agent does not stop in time", async () => {
     vi.useFakeTimers();
     try {
-      useAgents.setState({ tasks: new Map([[task.id, { ...task, status: "running" }]]) });
+      useAgents.setState({
+        tasks: new Map([[task.id, { ...task, status: "running" }]]),
+      });
       const result = expect(retractFrom(task.id, 1, "Original")).rejects.toThrow("The agent is still stopping");
       await vi.advanceTimersByTimeAsync(15_000);
       await result;
@@ -120,7 +146,10 @@ describe("retracting a turn", () => {
   });
 
   it("recovers the original prompt when rollback fails", async () => {
-    ipc.rollback.mockResolvedValue({ status: "error", error: { kind: "internal", message: "Rollback failed" } });
+    ipc.rollback.mockResolvedValue({
+      status: "error",
+      error: { kind: "internal", message: "Rollback failed" },
+    });
     await expect(retractFrom(task.id, 1, "Original")).rejects.toThrow("Rollback failed");
     expect(composerDraft(task.id).text).toBe("Original");
     expect(ipc.prompt).not.toHaveBeenCalled();
@@ -137,7 +166,9 @@ describe("retracting a turn", () => {
     );
     render(<SessionEditor input={{ kind: "agent-session", key: task.id, data: { task: task.id } }} />);
     const user = userEvent.setup();
-    const retract = screen.getAllByRole("button", { name: "Retract Message" })[0]!;
+    const retract = screen.getAllByRole("button", {
+      name: "Retract Message",
+    })[0]!;
     await user.click(retract);
     await user.click(retract);
     expect(ipc.confirm).toHaveBeenCalledTimes(1);
@@ -156,8 +187,12 @@ async function edit() {
   const user = userEvent.setup();
   await user.click(await screen.findByRole("button", { name: "Edit" }));
   const box = screen.getAllByRole("textbox", { name: "Message" })[0]!;
-  fireEvent.change(box, { target: { value: "Edited message" } });
-  return { user, box, send: screen.getAllByRole("button", { name: "Send" })[0]! };
+  typeIn(box, "Edited message");
+  return {
+    user,
+    box,
+    send: screen.getAllByRole("button", { name: "Send" })[0]!,
+  };
 }
 
 it.each([false, true])("recovers images after failed regeneration (new draft: %s)", async (draft) => {
@@ -168,7 +203,13 @@ it.each([false, true])("recovers images after failed regeneration (new draft: %s
       [
         task.id,
         [
-          { type: "user", text: "Original message", attachments: [image.name], images: [image], steered: false },
+          {
+            type: "user",
+            text: "Original message",
+            attachments: [image.name],
+            images: [image],
+            steered: false,
+          },
           entries[1]!,
         ],
       ],
@@ -185,8 +226,16 @@ it.each([false, true])("recovers images after failed regeneration (new draft: %s
     .run({ ctx: {}, arg: { task: task.id, turn: 0 } });
   await waitFor(() => expect(ipc.prompt).toHaveBeenCalledTimes(1));
   const files = draft ? [{ path: "/project/a.ts", rel: "a.ts" }] : [];
-  if (draft) updateComposer(task.id, { text: "Another draft @a.ts", files, images: [added] });
-  finish({ status: "error", error: { kind: "internal", message: "Send failed" } });
+  if (draft)
+    updateComposer(task.id, {
+      text: "Another draft @a.ts",
+      files,
+      images: [added],
+    });
+  finish({
+    status: "error",
+    error: { kind: "internal", message: "Send failed" },
+  });
   await running;
   const expected = {
     text: draft ? "Original message\nAnother draft @a.ts" : "Original message",
@@ -202,7 +251,14 @@ it.each([false, true])("recovers images after failed regeneration (new draft: %s
 
 describe("a sent message with images", () => {
   afterEach(() => {
-    entries[0] = { type: "user", text: "Original message", attachments: [], sentMs: 1, doneMs: 2, steered: false };
+    entries[0] = {
+      type: "user",
+      text: "Original message",
+      attachments: [],
+      sentMs: 1,
+      doneMs: 2,
+      steered: false,
+    };
   });
 
   it("shows the images and lists only the files as chips", async () => {
@@ -220,7 +276,14 @@ describe("a sent message with images", () => {
     expect(img).toHaveAttribute("src", "data:image/png;base64,AAA");
     expect(screen.getByText("a.ts")).toBeInTheDocument();
     expect(screen.queryByText("shot.png")).not.toBeInTheDocument();
-    entries[0] = { type: "user", text: "Original message", attachments: [], sentMs: 1, doneMs: 2, steered: false };
+    entries[0] = {
+      type: "user",
+      text: "Original message",
+      attachments: [],
+      sentMs: 1,
+      doneMs: 2,
+      steered: false,
+    };
   });
 
   it("opens an image in a dialog and keeps the images when editing, minus the removed ones", async () => {
@@ -250,7 +313,14 @@ describe("a sent message with images", () => {
     await user.click(screen.getAllByRole("button", { name: "Send" })[0]!);
     await waitFor(() => expect(ipc.prompt).toHaveBeenCalledTimes(1));
     expect(ipc.prompt.mock.calls[0]![1].images).toEqual([{ mimeType: "image/png", data: "BBB", name: "b.png" }]);
-    entries[0] = { type: "user", text: "Original message", attachments: [], sentMs: 1, doneMs: 2, steered: false };
+    entries[0] = {
+      type: "user",
+      text: "Original message",
+      attachments: [],
+      sentMs: 1,
+      doneMs: 2,
+      steered: false,
+    };
   });
 });
 
@@ -260,7 +330,7 @@ describe("editing a sent agent message", () => {
     expect(send.textContent).toBe("");
     expect(send).toHaveAttribute("data-tooltip", "Send");
     expect(send).toBeEnabled();
-    fireEvent.change(box, { target: { value: "" } });
+    typeIn(box, "");
     expect(send).toBeDisabled();
   });
 
@@ -271,15 +341,18 @@ describe("editing a sent agent message", () => {
     fireEvent.keyDown(box, { key: "Enter", metaKey: true, isComposing: true });
     fireEvent.keyDown(box, { key: "Enter", metaKey: true, keyCode: 229 });
     expect(ipc.rollback).not.toHaveBeenCalled();
-    expect(box).toHaveValue("Edited message");
+    expect(textOf(box)).toBe("Edited message");
   });
 
   it("keeps the draft and shows a rollback failure beside it", async () => {
-    ipc.rollback.mockResolvedValue({ status: "error", error: { kind: "internal", message: "Rollback failed" } });
+    ipc.rollback.mockResolvedValue({
+      status: "error",
+      error: { kind: "internal", message: "Rollback failed" },
+    });
     const { user, box, send } = await edit();
     await user.click(send);
     expect(await screen.findByRole("alert")).toHaveTextContent("Rollback failed");
-    expect(box).toHaveValue("Edited message");
+    expect(textOf(box)).toBe("Edited message");
     expect(box).toBeInTheDocument();
     expect(send).toBeEnabled();
     expect(ipc.prompt).not.toHaveBeenCalled();
@@ -328,8 +401,13 @@ describe("editing a sent agent message", () => {
     act(() => updateComposer(task.id, { text: draft }));
     await user.click(send);
     expect(box).not.toBeInTheDocument();
-    await act(async () => finish({ status: "error", error: { kind: "internal", message: "Send failed" } }));
-    expect(screen.getByRole("textbox", { name: "Message" })).toHaveValue(
+    await act(async () =>
+      finish({
+        status: "error",
+        error: { kind: "internal", message: "Send failed" },
+      }),
+    );
+    expect(textOf(screen.getByRole("textbox", { name: "Message" }))).toBe(
       draft ? `Edited message\n${draft}` : "Edited message",
     );
     expect(screen.getByRole("textbox", { name: "Message" })).toHaveFocus();
@@ -346,7 +424,9 @@ describe("editing a sent agent message", () => {
   });
 
   it("waits for a running turn to stop before rolling it back", async () => {
-    useAgents.setState({ tasks: new Map([[task.id, { ...task, status: "running" }]]) });
+    useAgents.setState({
+      tasks: new Map([[task.id, { ...task, status: "running" }]]),
+    });
     const { user, send } = await edit();
     await user.click(send);
     expect(ipc.cancel).toHaveBeenCalledWith(task.id, null);
@@ -367,7 +447,7 @@ describe("editing a sent agent message", () => {
       expect(ipc.rollback).not.toHaveBeenCalled();
       expect(ipc.prompt).not.toHaveBeenCalled();
       await user.click(screen.getByRole("button", { name: "Edit" }));
-      expect(screen.getAllByRole("textbox", { name: "Message" })[0]).toHaveValue("Original message");
+      expect(textOf(screen.getAllByRole("textbox", { name: "Message" })[0]!)).toBe("Original message");
     },
   );
 });
@@ -376,24 +456,34 @@ describe("session composer submission", () => {
   it.each(["click", "Enter"])("keeps an accessible icon-only Send action with %s submission", async (method) => {
     let finish!: (value: unknown) => void;
     ipc.prompt.mockReturnValue(new Promise((resolve) => (finish = resolve)));
-    render(<SessionEditor input={{ kind: "agent-session", key: task.id, data: { task: task.id } }} />);
+    render(
+      <SessionEditor
+        input={{
+          kind: "agent-session",
+          key: task.id,
+          data: { task: task.id },
+        }}
+      />,
+    );
     const send = screen.getByRole("button", { name: "Send" });
     expect(send.textContent).toBe("");
     expect(send).toHaveAttribute("data-tooltip", "Send");
     expect(send).toBeDisabled();
     const box = screen.getByRole("textbox", { name: "Message" });
-    fireEvent.change(box, { target: { value: "Follow up" } });
+    typeIn(box, "Follow up");
     expect(send).toBeEnabled();
     if (method === "click") fireEvent.click(send);
     else fireEvent.keyDown(box, { key: "Enter" });
     expect(ipc.prompt).toHaveBeenCalledExactlyOnceWith(task.id, { text: "Follow up", files: [], images: [] }, false);
     expect(send).toBeDisabled();
     await act(async () => finish({ status: "ok", data: null }));
-    expect(box).toHaveValue("");
+    expect(textOf(box)).toBe("");
   });
 
   it("keeps Queue named and shows icon-only Stop actions while the agent works", async () => {
-    useAgents.setState({ tasks: new Map([[task.id, { ...task, status: "running" }]]) });
+    useAgents.setState({
+      tasks: new Map([[task.id, { ...task, status: "running" }]]),
+    });
     render(<SessionEditor input={{ kind: "agent-session", key: task.id, data: { task: task.id } }} />);
     const queue = screen.getByRole("button", { name: "Queue" });
     expect(queue.textContent).toBe("");

src/features/agents/references.ts

@@ -1,5 +1,6 @@
 /** "Send to Agent": the editor selection or Project view files as `@` references. */
-import { activeEditor } from "@/editor/api";
+import { activeEditor, useEditorRegistry } from "@/editor/api";
+import { noteCopySource } from "@/platform/clipboardSource";
 import { useProject } from "@/platform/project";
 import { isVirtualUri } from "@/platform/virtualDocs";
 import { mentionOf } from "./composerModel";
@@ -34,3 +35,25 @@ export function sendPaths(paths: readonly string[]): boolean {
   if (refs.length) addReferences(refs);
   return refs.length > 0;
 }
+
+/**
+ * Notes the lines an editor's copy takes (the whole line when nothing is selected), so pasting
+ * them into the composer references the file's lines.
+ */
+export function trackEditorCopies(): () => void {
+  const onCopy = (e: ClipboardEvent) => {
+    const handle = [...useEditorRegistry.getState().editors].find((h) =>
+      h.view.contentDOM.contains(e.target as Node | null),
+    );
+    if (!handle || isVirtualUri(handle.ctx.path)) return;
+    const { state } = handle.view;
+    const sel = state.selection.main;
+    const first = state.doc.lineAt(sel.from);
+    // A selection ending at a line start does not include that line.
+    const last = state.doc.lineAt(sel.to > sel.from && state.doc.lineAt(sel.to).from === sel.to ? sel.to - 1 : sel.to);
+    const text = sel.empty ? first.text : state.sliceDoc(sel.from, sel.to);
+    noteCopySource(text, { kind: "file", path: handle.ctx.path, from: first.number, to: last.number });
+  };
+  document.addEventListener("copy", onCopy, true);
+  return () => document.removeEventListener("copy", onCopy, true);
+}

src/features/agents/sessionState.test.tsx

@@ -15,7 +15,8 @@ import { taskActions } from "./taskActions";
 import { replyActions } from "./replyActions";
 import { focusedSession } from "./sessionFocus";
 import styles from "./Session.module.css";
-import tagStyles from "@/ui/InlineTag.module.css";
+import chipStyles from "./ReferenceChip.module.css";
+import { textOf, typeIn } from "./composerTesting";
 
 const backend = vi.hoisted(() => ({
   entries: new Map<string, AgentEntry[]>(),
@@ -48,12 +49,19 @@ const backend = vi.hoisted(() => ({
 vi.mock("@/platform/ipc", async (original) => ({
   ...(await original<typeof import("@/platform/ipc")>()),
   commands: {
+    fsProbe: async () => ({
+      status: "ok",
+      data: { size: 1, binary: false, tooLarge: false },
+    }),
     agentEntries: async (id: string, sub: string | null) => {
       const key = sub ? `${id}/${sub}` : id;
       backend.fetched.push(key);
       await backend.entryWait;
       if (backend.entryError !== null)
-        return { status: "error", error: { kind: "unavailable", message: backend.entryError } };
+        return {
+          status: "error",
+          error: { kind: "unavailable", message: backend.entryError },
+        };
       return { status: "ok", data: backend.entries.get(key) ?? [] };
     },
     agentChanges: async () => {
@@ -85,12 +93,22 @@ vi.mock("@/platform/ipc", async (original) => ({
       backend.imported.push([provider, sessionId]);
       const found = backend.external.find((e) => e.provider === provider && e.sessionId === sessionId);
       if (!found) throw new Error("unknown session");
-      return { status: "ok", data: { ...task("imported"), id: "imported", title: found.title, provider } };
+      return {
+        status: "ok",
+        data: {
+          ...task("imported"),
+          id: "imported",
+          title: found.title,
+          provider,
+        },
+      };
     },
   },
 }));
 vi.mock("@tauri-apps/api/webview", () => ({
-  getCurrentWebview: () => ({ onDragDropEvent: () => Promise.resolve(() => {}) }),
+  getCurrentWebview: () => ({
+    onDragDropEvent: () => Promise.resolve(() => {}),
+  }),
 }));
 vi.mock("@/workbench/messages", async (original) => ({
   ...(await original<typeof import("@/workbench/messages")>()),
@@ -139,7 +157,11 @@ const subagent: SubagentEntry = {
   endedMs: 1,
   cancellable: false,
 };
-const input = (id: string) => ({ kind: SESSION_KIND, key: sessionKey(id), data: { task: id } });
+const input = (id: string) => ({
+  kind: SESSION_KIND,
+  key: sessionKey(id),
+  data: { task: id },
+});
 const stream = () => document.querySelector<HTMLDivElement>(`.${styles.stream}`)!;
 const tool = (id: string, overrides: Partial<Extract<AgentEntry, { type: "tool" }>> = {}): AgentEntry => ({
   type: "tool",
@@ -182,7 +204,10 @@ beforeEach(() => {
   backend.imported = [];
   backend.externalError = null;
   backend.accepted = [];
-  backend.acceptedOutcome = { accepted: ["very-long-file-name.ts"], skipped: [] };
+  backend.acceptedOutcome = {
+    accepted: ["very-long-file-name.ts"],
+    skipped: [],
+  };
   backend.confirmed = [];
   backend.confirmAnswer = true;
   backend.entries = new Map([
@@ -203,7 +228,9 @@ beforeEach(() => {
 
 describe("conversation rows", () => {
   it("keeps authors above messages and their folded work with matching icon-only actions", async () => {
-    useProject.setState({ settings: { agents: { foldTurns: false } } as never });
+    useProject.setState({
+      settings: { agents: { foldTurns: false } } as never,
+    });
     const user = (text: string): AgentEntry => ({
       type: "user",
       text,
@@ -229,8 +256,12 @@ describe("conversation rows", () => {
     const author = stream().querySelectorAll(`.${styles.agentAuthor}`)[1]!;
     expect(author.nextElementSibling).toHaveClass(styles.processRun!);
     expect(author.parentElement?.nextElementSibling?.firstElementChild).toHaveClass(styles.agentMessage!);
-    const quote = within(stream()).getAllByRole("button", { name: "Quote Reply" });
-    const copy = within(stream()).getAllByRole("button", { name: "Copy Markdown" });
+    const quote = within(stream()).getAllByRole("button", {
+      name: "Quote Reply",
+    });
+    const copy = within(stream()).getAllByRole("button", {
+      name: "Copy Markdown",
+    });
     // One per turn: only a turn's final reply carries actions.
     expect(quote).toHaveLength(2);
     for (const button of [...quote, ...copy]) {
@@ -250,8 +281,18 @@ describe("conversation rows", () => {
       tool("two"),
       { type: "agent", text: "More detail" },
       tool("List .", { status: "running" }),
-      { type: "permission", id: 1, title: "Run python3", command: "python3", options: [], chosen },
-      { type: "plan", items: [{ content: "Check files", status: "in_progress" }] },
+      {
+        type: "permission",
+        id: 1,
+        title: "Run python3",
+        command: "python3",
+        options: [],
+        chosen,
+      },
+      {
+        type: "plan",
+        items: [{ content: "Check files", status: "in_progress" }],
+      },
       { type: "thought", text: "Consider the result" },
       { type: "agent", text: "Done" },
     ]);
@@ -284,9 +325,18 @@ describe("conversation rows", () => {
   );
 
   it("puts the time and hover actions under a turn's final reply only", async () => {
-    useProject.setState({ settings: { agents: { foldTurns: false } } as never });
+    useProject.setState({
+      settings: { agents: { foldTurns: false } } as never,
+    });
     backend.entries.set("A", [
-      { type: "user", text: "Question", attachments: [], steered: false, sentMs: 1000, doneMs: 13000 },
+      {
+        type: "user",
+        text: "Question",
+        attachments: [],
+        steered: false,
+        sentMs: 1000,
+        doneMs: 13000,
+      },
       { type: "agent", text: "First reply" },
       tool("read"),
       { type: "agent", text: "Final reply" },
@@ -349,7 +399,14 @@ describe("process folding", () => {
 describe("turn folding", () => {
   it("folds a finished turn's work under its message and keeps the reply", async () => {
     backend.entries.set("A", [
-      { type: "user", text: "Question", attachments: [], steered: false, sentMs: 1000, doneMs: 13000 },
+      {
+        type: "user",
+        text: "Question",
+        attachments: [],
+        steered: false,
+        sentMs: 1000,
+        doneMs: 13000,
+      },
       { type: "thought", text: "think" },
       tool("one"),
       { type: "agent", text: "Interim note" },
@@ -371,7 +428,14 @@ describe("turn folding", () => {
 
   it("leaves the turn the agent works on open", async () => {
     backend.entries.set("A", [
-      { type: "user", text: "Question", attachments: [], steered: false, sentMs: 1000, doneMs: null },
+      {
+        type: "user",
+        text: "Question",
+        attachments: [],
+        steered: false,
+        sentMs: 1000,
+        doneMs: null,
+      },
       tool("one"),
       { type: "agent", text: "Interim note" },
     ]);
@@ -404,7 +468,10 @@ describe("opened runs", () => {
       doneMs: null,
     } as const;
     const setTask = (status: AgentTask["status"]) => ({
-      tasks: new Map(useAgents.getState().tasks).set("A", { ...useAgents.getState().tasks.get("A")!, status }),
+      tasks: new Map(useAgents.getState().tasks).set("A", {
+        ...useAgents.getState().tasks.get("A")!,
+        status,
+      }),
     });
     useAgents.setState({
       entries: new Map([["A", [asked, tool("one"), tool("two"), { type: "agent", text: "Interim" }] as AgentEntry[]]]),
@@ -458,8 +525,33 @@ describe("folded content", () => {
   });
 });
 
+describe("message code blocks", () => {
+  it("shows a terminal block as a card, folding long output", async () => {
+    const output = Array.from({ length: 20 }, (_, i) => `line ${i + 1}`).join("\n");
+    backend.entries.set("A", [
+      {
+        type: "user",
+        text: `why?\n\`\`\`terminal zsh\n${output}\n\`\`\`\nthanks`,
+        attachments: [],
+        images: [],
+        sentMs: 1,
+        doneMs: 2,
+        steered: false,
+      },
+    ]);
+    useAgents.setState({ entries: new Map(backend.entries) });
+    render(<SessionEditor input={input("A")} />);
+    const card = await within(stream()).findByRole("group", { name: "Terminal · zsh" });
+    expect(card).toHaveTextContent("20 lines");
+    expect(card.querySelector("pre")!.textContent!.split("\n")).toHaveLength(12);
+    fireEvent.click(within(card).getByRole("button", { name: "Show 8 more lines" }));
+    expect(card.querySelector("pre")!.textContent!.split("\n")).toHaveLength(20);
+    expect(within(stream()).getByText(/thanks/)).toBeInTheDocument();
+  });
+});
+
 describe("message tags", () => {
-  it("shows file references and skills as distinct tags", async () => {
+  it("shows file references as chips that open the file, and skills as tags", async () => {
     backend.entries.set("A", [
       {
         type: "user",
@@ -473,8 +565,14 @@ describe("message tags", () => {
     ]);
     useAgents.setState({ entries: new Map(backend.entries) });
     render(<SessionEditor input={input("A")} />);
-    expect(await screen.findByText("@src/a.ts")).toHaveClass(tagStyles.tag!);
-    expect(screen.getByText("/triage")).toHaveClass(tagStyles.accent!);
+    const chip = await within(stream()).findByRole("button", {
+      name: "File reference a.ts",
+    });
+    expect(chip).toHaveTextContent("a.ts");
+    expect(chip).toHaveAttribute("data-ref-path", "/project/src/a.ts");
+    expect(within(stream()).getByText("/triage")).toHaveClass(chipStyles.command!);
+    // Mentioned in the text, so not listed again under it.
+    expect(within(stream()).getAllByText("a.ts")).toHaveLength(1);
   });
 });
 
@@ -514,8 +612,14 @@ describe("scrolling", () => {
     render(<SessionEditor input={input("A")} />);
     const el = stream();
     let height = 1000;
-    Object.defineProperty(el, "scrollHeight", { configurable: true, get: () => height });
-    Object.defineProperty(el, "clientHeight", { configurable: true, value: 400 });
+    Object.defineProperty(el, "scrollHeight", {
+      configurable: true,
+      get: () => height,
+    });
+    Object.defineProperty(el, "clientHeight", {
+      configurable: true,
+      value: 400,
+    });
     el.scrollTop = 600;
     fireEvent.scroll(el);
     fireEvent.wheel(el, { deltaY: -200 });
@@ -523,16 +627,42 @@ describe("scrolling", () => {
     fireEvent.scroll(el);
     expect(screen.getByRole("button", { name: "Jump to Latest" })).toBeInTheDocument();
     height = 1100;
-    const sent = { type: "user", text: "Next", attachments: [], steered: false, sentMs: 1, doneMs: null } as AgentEntry;
+    const sent = {
+      type: "user",
+      text: "Next",
+      attachments: [],
+      steered: false,
+      sentMs: 1,
+      doneMs: null,
+    } as AgentEntry;
     act(() => useAgents.setState({ entries: new Map([["A", [reply, sent]]]) }));
     expect(el.scrollTop).toBe(1100);
     expect(screen.queryByRole("button", { name: "Jump to Latest" })).toBeNull();
   });
 
   it.each([
-    { name: "stays at the end below it", top: 300, bottom: 360, scrolled: 60, away: false },
-    { name: "keeps its header on screen", top: 50, bottom: 900, scrolled: 50, away: true },
-    { name: "back at the end without following", top: 300, bottom: 360, scrolled: 60, away: false, released: true },
+    {
+      name: "stays at the end below it",
+      top: 300,
+      bottom: 360,
+      scrolled: 60,
+      away: false,
+    },
+    {
+      name: "keeps its header on screen",
+      top: 50,
+      bottom: 900,
+      scrolled: 50,
+      away: true,
+    },
+    {
+      name: "back at the end without following",
+      top: 300,
+      bottom: 360,
+      scrolled: 60,
+      away: false,
+      released: true,
+    },
   ])("scrolls a section opened at the end into view: $name", async ({ top, bottom, scrolled, away, released }) => {
     backend.entries.set("A", [
       { type: "thought", text: "Weighing it" },
@@ -542,8 +672,14 @@ describe("scrolling", () => {
     render(<SessionEditor input={input("A")} />);
     await screen.findByText("Answer A");
     const el = stream();
-    Object.defineProperty(el, "scrollHeight", { configurable: true, value: 1000 });
-    Object.defineProperty(el, "clientHeight", { configurable: true, value: 400 });
+    Object.defineProperty(el, "scrollHeight", {
+      configurable: true,
+      value: 1000,
+    });
+    Object.defineProperty(el, "clientHeight", {
+      configurable: true,
+      value: 400,
+    });
     el.getBoundingClientRect = () => ({ top: 0, bottom: 400 }) as DOMRect;
     el.scrollTop = 600;
     fireEvent.scroll(el);
@@ -575,13 +711,21 @@ describe("scrolling", () => {
   });
 
   it("keeps following when the view grows taller and the browser pulls the offset back", () => {
-    useAgents.setState({ entries: new Map([["A", [{ type: "agent", text: "Initial reply" }]]]) });
+    useAgents.setState({
+      entries: new Map([["A", [{ type: "agent", text: "Initial reply" }]]]),
+    });
     render(<SessionEditor input={input("A")} />);
     const el = stream();
     let height = 1000;
     let viewport = 400;
-    Object.defineProperty(el, "scrollHeight", { configurable: true, get: () => height });
-    Object.defineProperty(el, "clientHeight", { configurable: true, get: () => viewport });
+    Object.defineProperty(el, "scrollHeight", {
+      configurable: true,
+      get: () => height,
+    });
+    Object.defineProperty(el, "clientHeight", {
+      configurable: true,
+      get: () => viewport,
+    });
     el.scrollTop = 600;
     fireEvent.scroll(el);
     // The composer shrank after sending: the end moved up and the offset was clamped to it.
@@ -590,19 +734,31 @@ describe("scrolling", () => {
     fireEvent.scroll(el);
     expect(screen.queryByRole("button", { name: "Jump to Latest" })).toBeNull();
     height = 1200;
-    act(() => useAgents.setState({ entries: new Map([["A", [{ type: "agent", text: "Streaming" }]]]) }));
+    act(() =>
+      useAgents.setState({
+        entries: new Map([["A", [{ type: "agent", text: "Streaming" }]]]),
+      }),
+    );
     expect(el.scrollTop).toBe(1200);
   });
 
   it.each(["wheel", "touch", "ArrowUp", "PageUp", "Home", "Shift+Space"])(
     "releases following before an upward %s scroll, even within the bottom threshold",
     async (method) => {
-      useAgents.setState({ entries: new Map([["A", [{ type: "agent", text: "Initial reply" }]]]) });
+      useAgents.setState({
+        entries: new Map([["A", [{ type: "agent", text: "Initial reply" }]]]),
+      });
       render(<SessionEditor input={input("A")} />);
       const el = stream();
       let height = 1000;
-      Object.defineProperty(el, "scrollHeight", { configurable: true, get: () => height });
-      Object.defineProperty(el, "clientHeight", { configurable: true, value: 400 });
+      Object.defineProperty(el, "scrollHeight", {
+        configurable: true,
+        get: () => height,
+      });
+      Object.defineProperty(el, "clientHeight", {
+        configurable: true,
+        value: 400,
+      });
       el.scrollTop = 600;
       fireEvent.scroll(el);
       if (method === "wheel") fireEvent.wheel(el, { deltaY: -4 });
@@ -614,7 +770,11 @@ describe("scrolling", () => {
       if (method === "Shift+Space") fireEvent.keyDown(el, { key: " ", shiftKey: true });
       // A chunk can land before the browser dispatches the scroll event.
       height = 1004;
-      act(() => useAgents.setState({ entries: new Map([["A", [{ type: "agent", text: "Streaming" }]]]) }));
+      act(() =>
+        useAgents.setState({
+          entries: new Map([["A", [{ type: "agent", text: "Streaming" }]]]),
+        }),
+      );
       expect(el.scrollTop).toBe(600);
       el.scrollTop = 588;
       fireEvent.scroll(el);
@@ -623,7 +783,11 @@ describe("scrolling", () => {
       el.scrollTop = 592;
       fireEvent.scroll(el);
       height = 1008;
-      act(() => useAgents.setState({ entries: new Map([["A", [{ type: "agent", text: "More streaming" }]]]) }));
+      act(() =>
+        useAgents.setState({
+          entries: new Map([["A", [{ type: "agent", text: "More streaming" }]]]),
+        }),
+      );
       expect(el.scrollTop).toBe(592);
       expect(screen.getByRole("button", { name: "Jump to Latest" })).toBeInTheDocument();
       // Scrolling down to the end resumes following.
@@ -631,29 +795,49 @@ describe("scrolling", () => {
       el.scrollTop = 608;
       fireEvent.scroll(el);
       height = 1100;
-      act(() => useAgents.setState({ entries: new Map([["A", [{ type: "agent", text: "Latest" }]]]) }));
+      act(() =>
+        useAgents.setState({
+          entries: new Map([["A", [{ type: "agent", text: "Latest" }]]]),
+        }),
+      );
       expect(el.scrollTop).toBe(1100);
     },
   );
 
   it("does not move the viewport while the scrollbar is held during streaming", () => {
-    useAgents.setState({ entries: new Map([["A", [{ type: "agent", text: "Initial reply" }]]]) });
+    useAgents.setState({
+      entries: new Map([["A", [{ type: "agent", text: "Initial reply" }]]]),
+    });
     render(<SessionEditor input={input("A")} />);
     const el = stream();
     let height = 1000;
-    Object.defineProperty(el, "scrollHeight", { configurable: true, get: () => height });
-    Object.defineProperty(el, "clientHeight", { configurable: true, value: 400 });
+    Object.defineProperty(el, "scrollHeight", {
+      configurable: true,
+      get: () => height,
+    });
+    Object.defineProperty(el, "clientHeight", {
+      configurable: true,
+      value: 400,
+    });
     el.scrollTop = 600;
     fireEvent.scroll(el);
     fireEvent.pointerDown(el);
     height = 1100;
-    act(() => useAgents.setState({ entries: new Map([["A", [{ type: "agent", text: "Streaming" }]]]) }));
+    act(() =>
+      useAgents.setState({
+        entries: new Map([["A", [{ type: "agent", text: "Streaming" }]]]),
+      }),
+    );
     expect(el.scrollTop).toBe(600);
     el.scrollTop = 588;
     fireEvent.scroll(el);
     fireEvent.pointerUp(window);
     height = 1200;
-    act(() => useAgents.setState({ entries: new Map([["A", [{ type: "agent", text: "More streaming" }]]]) }));
+    act(() =>
+      useAgents.setState({
+        entries: new Map([["A", [{ type: "agent", text: "More streaming" }]]]),
+      }),
+    );
     expect(el.scrollTop).toBe(588);
   });
 
@@ -664,15 +848,25 @@ describe("scrolling", () => {
     const el = stream();
     const output = screen.getByText("Tool output");
     let height = 1000;
-    Object.defineProperty(el, "scrollHeight", { configurable: true, get: () => height });
-    Object.defineProperty(el, "clientHeight", { configurable: true, value: 400 });
+    Object.defineProperty(el, "scrollHeight", {
+      configurable: true,
+      get: () => height,
+    });
+    Object.defineProperty(el, "clientHeight", {
+      configurable: true,
+      value: 400,
+    });
     output.style.overflowY = "auto";
     output.scrollTop = 100;
     el.scrollTop = 600;
     fireEvent.scroll(el);
     fireEvent.wheel(output, { deltaY: -4 });
     height = 1100;
-    act(() => useAgents.setState({ entries: new Map([["A", [...transcript, { type: "agent", text: "Streaming" }]]]) }));
+    act(() =>
+      useAgents.setState({
+        entries: new Map([["A", [...transcript, { type: "agent", text: "Streaming" }]]]),
+      }),
+    );
     expect(el.scrollTop).toBe(1100);
     expect(screen.queryByRole("button", { name: "Jump to Latest" })).toBeNull();
   });
@@ -681,8 +875,14 @@ describe("scrolling", () => {
     render(<SessionEditor input={input("A")} />);
     const el = stream();
     let height = 1000;
-    Object.defineProperty(el, "scrollHeight", { configurable: true, get: () => height });
-    Object.defineProperty(el, "clientHeight", { configurable: true, value: 400 });
+    Object.defineProperty(el, "scrollHeight", {
+      configurable: true,
+      get: () => height,
+    });
+    Object.defineProperty(el, "clientHeight", {
+      configurable: true,
+      value: 400,
+    });
     fireEvent.wheel(el);
     el.scrollTop = 100;
     fireEvent.scroll(el);
@@ -691,7 +891,11 @@ describe("scrolling", () => {
     act(() => useAgents.setState({ entries: new Map([["A", []]]) }));
     expect(screen.queryByRole("button", { name: "Jump to Latest" })).toBeNull();
     height = 1400;
-    act(() => useAgents.setState({ entries: new Map([["A", [{ type: "agent", text: "New reply" }]]]) }));
+    act(() =>
+      useAgents.setState({
+        entries: new Map([["A", [{ type: "agent", text: "New reply" }]]]),
+      }),
+    );
     expect(el.scrollTop).toBe(1400);
     expect(screen.queryByRole("button", { name: "Jump to Latest" })).toBeNull();
   });
@@ -706,8 +910,14 @@ describe("scrolling", () => {
       </EditorShownProvider>,
     );
     const el = stream();
-    Object.defineProperty(el, "scrollHeight", { configurable: true, value: 3000 });
-    Object.defineProperty(el, "clientHeight", { configurable: true, value: 400 });
+    Object.defineProperty(el, "scrollHeight", {
+      configurable: true,
+      value: 3000,
+    });
+    Object.defineProperty(el, "clientHeight", {
+      configurable: true,
+      value: 400,
+    });
     // Give the conversation a new tail while the scrollbar is held.
     fireEvent.pointerDown(el);
     act(() =>
@@ -738,8 +948,14 @@ describe("scrolling", () => {
     expect(await screen.findByText("Answer A")).toBeInTheDocument();
     const el = stream();
     let height = 1000;
-    Object.defineProperty(el, "scrollHeight", { configurable: true, get: () => height });
-    Object.defineProperty(el, "clientHeight", { configurable: true, value: 400 });
+    Object.defineProperty(el, "scrollHeight", {
+      configurable: true,
+      get: () => height,
+    });
+    Object.defineProperty(el, "clientHeight", {
+      configurable: true,
+      value: 400,
+    });
     el.scrollTop = 600;
     fireEvent.scroll(el);
     // The conversation grew after it was scrolled to the end, or WebKit moved the offset back
@@ -761,8 +977,14 @@ describe("scrolling", () => {
     render(<SessionEditor input={input("A")} />);
     expect(await screen.findByText("Answer A")).toBeInTheDocument();
     const el = stream();
-    Object.defineProperty(el, "scrollHeight", { configurable: true, value: 1000 });
-    Object.defineProperty(el, "clientHeight", { configurable: true, value: 400 });
+    Object.defineProperty(el, "scrollHeight", {
+      configurable: true,
+      value: 1000,
+    });
+    Object.defineProperty(el, "clientHeight", {
+      configurable: true,
+      value: 400,
+    });
     el.scrollTop = 600;
     fireEvent.scroll(el);
     el.scrollTop = 0;
@@ -775,13 +997,22 @@ describe("scrolling", () => {
     render(<SessionEditor input={input("A")} />);
     expect(await screen.findByText("Answer A")).toBeInTheDocument();
     const el = stream();
-    Object.defineProperty(el, "scrollHeight", { configurable: true, value: 1000 });
-    Object.defineProperty(el, "clientHeight", { configurable: true, value: 400 });
+    Object.defineProperty(el, "scrollHeight", {
+      configurable: true,
+      value: 1000,
+    });
+    Object.defineProperty(el, "clientHeight", {
+      configurable: true,
+      value: 400,
+    });
     fireEvent.wheel(el);
     el.scrollTop = 100;
     fireEvent.scroll(el);
     const jump = await screen.findByRole("button", { name: "Jump to Latest" });
-    Object.defineProperty(el, "scrollTo", { configurable: true, value: vi.fn() });
+    Object.defineProperty(el, "scrollTo", {
+      configurable: true,
+      value: vi.fn(),
+    });
     fireEvent.click(jump);
     expect(el.scrollTo).toHaveBeenCalledWith({ top: 1000, behavior: "smooth" });
     expect(screen.queryByRole("button", { name: "Jump to Latest" })).toBeNull();
@@ -801,7 +1032,11 @@ describe("tool calls", () => {
   });
 
   it("folds consecutive finished tool calls into one collapsed row", async () => {
-    const edit = (id: string) => tool(id, { kind: "edit", diffs: [{ path: "/project/a.ts", added: 2, removed: 1 }] });
+    const edit = (id: string) =>
+      tool(id, {
+        kind: "edit",
+        diffs: [{ path: "/project/a.ts", added: 2, removed: 1 }],
+      });
     backend.entries.set("A", [edit("one"), edit("two"), { type: "agent", text: "Answer A" }]);
     useAgents.setState({ entries: new Map(backend.entries) });
     render(<SessionEditor input={input("A")} />);
@@ -822,7 +1057,11 @@ describe("a pending question", () => {
         id: 7,
         title: question,
         options: [
-          { id: "a", name: "Ship it as is and record it (Recommended)", kind: "allow_once" },
+          {
+            id: "a",
+            name: "Ship it as is and record it (Recommended)",
+            kind: "allow_once",
+          },
           { id: "b", name: "Detect the request in code", kind: "allow_once" },
           { id: "c", name: "Skip", kind: "reject_once" },
         ],
@@ -833,7 +1072,9 @@ describe("a pending question", () => {
     backend.answers = [];
     useAgents.setState({ entries: new Map(backend.entries) });
     render(<SessionEditor input={input("A")} />);
-    const card = await screen.findByRole("region", { name: "Allow tool call?" });
+    const card = await screen.findByRole("region", {
+      name: "Allow tool call?",
+    });
     expect(within(card).getByText(question.replaceAll("\n", " "))).toBeInTheDocument();
     expect(screen.getAllByText(question.replaceAll("\n", " "))).toHaveLength(1);
     const answers = within(card).getAllByRole("button");
@@ -861,7 +1102,13 @@ describe("a pending AskUserQuestion", () => {
           header: answerKey,
           question: "Which?",
           multiSelect: false,
-          options: [{ label: index === 0 ? "One" : "Two", description: "", preview: null }],
+          options: [
+            {
+              label: index === 0 ? "One" : "Two",
+              description: "",
+              preview: null,
+            },
+          ],
         })),
       },
     ]);
@@ -891,8 +1138,16 @@ describe("a pending AskUserQuestion", () => {
             question: "Which layout?",
             multiSelect: false,
             options: [
-              { label: "Table (Recommended)", description: "One row per check", preview: null },
-              { label: "List", description: "Grouped under headings", preview: null },
+              {
+                label: "Table (Recommended)",
+                description: "One row per check",
+                preview: null,
+              },
+              {
+                label: "List",
+                description: "Grouped under headings",
+                preview: null,
+              },
             ],
           },
           {
@@ -944,11 +1199,20 @@ describe("a pending AskUserQuestion", () => {
     fireEvent.click(within(card).getByRole("checkbox", { name: /^Disk/ }));
     fireEvent.click(within(card).getByRole("checkbox", { name: /^Other/ }));
     expect(submit).toHaveProperty("disabled", true);
-    fireEvent.change(within(card).getByPlaceholderText("Type your answer"), { target: { value: "GPU temps" } });
+    fireEvent.change(within(card).getByPlaceholderText("Type your answer"), {
+      target: { value: "GPU temps" },
+    });
     fireEvent.click(submit);
     await waitFor(() =>
       expect(backend.answers).toEqual([
-        ["A", 9, JSON.stringify({ "Which layout?": ["List"], "Which checks?": ["Disk", "GPU temps"] })],
+        [
+          "A",
+          9,
+          JSON.stringify({
+            "Which layout?": ["List"],
+            "Which checks?": ["Disk", "GPU temps"],
+          }),
+        ],
       ]),
     );
   });
@@ -1008,7 +1272,11 @@ describe("a pending permission request above the composer", () => {
   const command = 'python3 -c \'from pathlib import Path\np = Path("note.txt")\np.write_text("one\\ntwo")\'';
   const options = [
     { id: "opaque-once", name: "Allow Once", kind: "allow_once" },
-    { id: "opaque-policy", name: `Always Allow \`${command}\``, kind: "allow_always" },
+    {
+      id: "opaque-policy",
+      name: `Always Allow \`${command}\``,
+      kind: "allow_always",
+    },
     { id: "opaque-no", name: "Decline", kind: "reject_once" },
     { id: "opaque-stop", name: "Decline and Stop", kind: "reject_always" },
   ];
@@ -1025,11 +1293,20 @@ describe("a pending permission request above the composer", () => {
         diffs: [],
         locations: [],
       },
-      { type: "permission", id: 12, title: `Run ${command}`, command, options, chosen: null },
+      {
+        type: "permission",
+        id: 12,
+        title: `Run ${command}`,
+        command,
+        options,
+        chosen: null,
+      },
     ]);
     useAgents.setState({ entries: new Map(backend.entries) });
     render(<SessionEditor input={input("A")} />);
-    const card = await screen.findByRole("region", { name: "codex wants to run a command" });
+    const card = await screen.findByRole("region", {
+      name: "codex wants to run a command",
+    });
     expect(screen.getAllByRole("region", { name: "codex wants to run a command" })).toHaveLength(1);
     expect(screen.queryByRole("alert")).toBeNull();
     expect(stream()).not.toContainElement(card);
@@ -1048,36 +1325,58 @@ describe("a pending permission request above the composer", () => {
   });
 
   it.each(options)("sends the original $kind option id, then records it in the conversation", async (option) => {
-    const pending: AgentEntry = { type: "permission", id: 12, title: `Run ${command}`, command, options, chosen: null };
+    const pending: AgentEntry = {
+      type: "permission",
+      id: 12,
+      title: `Run ${command}`,
+      command,
+      options,
+      chosen: null,
+    };
     backend.answers = [];
     backend.entries.set("A", [pending]);
     useAgents.setState({ entries: new Map(backend.entries) });
     render(<SessionEditor input={input("A")} />);
-    const card = await screen.findByRole("region", { name: "codex wants to run a command" });
+    const card = await screen.findByRole("region", {
+      name: "codex wants to run a command",
+    });
     const button = within(card).getAllByRole("button")[options.indexOf(option)]!;
     button.focus();
     fireEvent.click(button);
     await waitFor(() => expect(backend.answers).toEqual([["A", 12, option.id]]));
     act(() =>
-      useAgents.setState({ entries: new Map(backend.entries).set("A", [{ ...pending, chosen: option.name }]) }),
+      useAgents.setState({
+        entries: new Map(backend.entries).set("A", [{ ...pending, chosen: option.name }]),
+      }),
     );
     expect(card).not.toBeInTheDocument();
-    const record = within(stream()).getByRole("region", { name: "codex wants to run a command" });
+    const record = within(stream()).getByRole("region", {
+      name: "codex wants to run a command",
+    });
     expect(record.querySelector("pre")).toBeNull();
     expect(within(record).queryByRole("button")).toBeNull();
     expect(record.textContent).toContain("python3 …");
     expect(record.textContent).not.toContain("write_text");
-    await waitFor(() => expect(document.activeElement?.tagName).toBe("TEXTAREA"));
+    await waitFor(() => expect(screen.getByRole("textbox", { name: "Message" })).toHaveFocus());
   });
 
   it("is answered with a number key when the focus isn't in a text field", async () => {
-    const pending: AgentEntry = { type: "permission", id: 12, title: `Run ${command}`, command, options, chosen: null };
+    const pending: AgentEntry = {
+      type: "permission",
+      id: 12,
+      title: `Run ${command}`,
+      command,
+      options,
+      chosen: null,
+    };
     backend.answers = [];
     backend.entries.set("A", [pending]);
     useAgents.setState({ entries: new Map(backend.entries) });
     render(<SessionEditor input={input("A")} />);
     await screen.findByRole("region", { name: "codex wants to run a command" });
-    fireEvent.keyDown(document.querySelector("textarea")!, { key: "1" });
+    fireEvent.keyDown(screen.getByRole("textbox", { name: "Message" }), {
+      key: "1",
+    });
     expect(backend.answers).toEqual([]);
     const elsewhere = document.body.appendChild(document.createElement("div"));
     fireEvent.keyDown(elsewhere, { key: "1" });
@@ -1103,12 +1402,20 @@ describe("a pending permission request above the composer", () => {
       },
     ]);
     backend.entries.set("B", [
-      { type: "permission", id: 4, title: "The agent asks for permission", options: [], chosen: null },
+      {
+        type: "permission",
+        id: 4,
+        title: "The agent asks for permission",
+        options: [],
+        chosen: null,
+      },
     ]);
     backend.answers = [];
     useAgents.setState({ entries: new Map(backend.entries) });
     const { unmount } = render(<SessionEditor input={input("A")} />);
-    const line = await screen.findByRole("region", { name: "codex wants to run a command" });
+    const line = await screen.findByRole("region", {
+      name: "codex wants to run a command",
+    });
     const answers = within(line.querySelector<HTMLElement>(`.${styles.permissionAnswers}`)!).getAllByRole("button");
     expect(answers.map((b) => b.textContent)).toEqual(["Allow Once", "Decline"]);
     fireEvent.click(answers[0]!);
@@ -1116,7 +1423,9 @@ describe("a pending permission request above the composer", () => {
     unmount();
 
     render(<SessionEditor input={input("B")} />);
-    const card = await screen.findByRole("region", { name: "Allow tool call?" });
+    const card = await screen.findByRole("region", {
+      name: "Allow tool call?",
+    });
     fireEvent.click(within(card).getByRole("button", { name: "Cancel" }));
     await waitFor(() =>
       expect(backend.answers).toEqual([
@@ -1177,7 +1486,9 @@ describe("conversation loading", () => {
   });
 
   it("keeps subagent failures separate and retries that subagent", async () => {
-    useAgents.setState({ entries: new Map([["A", backend.entries.get("A")!]]) });
+    useAgents.setState({
+      entries: new Map([["A", backend.entries.get("A")!]]),
+    });
     backend.entryError = "No such subagent";
     render(<SessionEditor input={input("A")} />);
     fireEvent.click(screen.getByRole("button", { name: /Explore task A/ }));
@@ -1251,7 +1562,9 @@ describe("session state across tasks and hosts", () => {
 
   it("opens a long conversation at its end and renders the earlier entries after it", async () => {
     const entries = Array.from({ length: 150 }, (_, i): AgentEntry => ({ type: "agent", text: `Reply ${i}` }));
-    useAgents.setState({ entries: new Map(useAgents.getState().entries).set("A", entries) });
+    useAgents.setState({
+      entries: new Map(useAgents.getState().entries).set("A", entries),
+    });
     render(<SessionEditor input={input("A")} />);
     expect(screen.getByText("Reply 149")).toBeInTheDocument();
     expect(await screen.findByText("Reply 0")).toBeInTheDocument();
@@ -1300,7 +1613,7 @@ describe("session state across tasks and hosts", () => {
     const markVisible = vi.spyOn(await import("./store"), "markVisible");
     vi.spyOn(document, "hasFocus").mockReturnValue(true);
     const message = screen.getByRole("textbox", { name: "Message" });
-    fireEvent.change(message, { target: { value: "Draft to keep" } });
+    typeIn(message, "Draft to keep");
     const conversation = stream();
     fireEvent.click(screen.getByRole("button", { name: /1 changed file/ }));
     expect(screen.getByRole("complementary", { name: "Changes" })).toBeVisible();
@@ -1315,7 +1628,7 @@ describe("session state across tasks and hosts", () => {
     expect(markVisible).toHaveBeenCalledWith("A");
     expect(useAgents.getState().unread.has("A")).toBe(false);
     expect(screen.getByRole("textbox", { name: "Message" })).toBe(message);
-    expect(message).toHaveValue("Draft to keep");
+    expect(textOf(message)).toBe("Draft to keep");
     expect(useAgents.getState().composers.get("A")?.text).toBe("Draft to keep");
     expect(JSON.parse(localStorage.getItem("openidea.agents.changesOpen.v1")!).A).toBe(true);
   });
@@ -1341,7 +1654,10 @@ describe("session state across tasks and hosts", () => {
     fireEvent.wheel(stream());
     stream().scrollTop = stick ? height - viewport : 230;
     fireEvent.scroll(stream());
-    expect(useAgents.getState().scrollPositions.get("A")).toEqual({ top: stick ? 1600 : 230, stick });
+    expect(useAgents.getState().scrollPositions.get("A")).toEqual({
+      top: stick ? 1600 : 230,
+      stick,
+    });
     view.unmount();
     viewport = 150;
     useAgents.setState({ docked: "A", sessionLocation: "toolWindow" });
@@ -1404,24 +1720,39 @@ describe("meters in the task header", () => {
   it("shows the provider's usage limits by default and each meter as Settings › Tools › Agents › Chat allows", async () => {
     const reported: AgentTask = {
       ...task("A"),
-      usage: { used: 24_000, size: 200_000, cost: { amount: 0.42, currency: "USD" } },
+      usage: {
+        used: 24_000,
+        size: 200_000,
+        cost: { amount: 0.42, currency: "USD" },
+      },
     };
     const limits = [
       { window: "five_hour", usedPercent: 19, resetsMs: null },
       { window: "seven_day", usedPercent: 9.4, resetsMs: null },
     ];
-    useAgents.setState({ tasks: new Map([["A", reported]]), limits: new Map([["codex", limits]]) });
+    useAgents.setState({
+      tasks: new Map([["A", reported]]),
+      limits: new Map([["codex", limits]]),
+    });
     render(<SessionEditor input={input("A")} />);
     await screen.findByText("Answer A");
     const usage = screen.getByLabelText(/^Context /);
     expect(usage).toHaveTextContent("24k/200k (12%)");
-    expect(usage.querySelector(`.${styles.usageBar} span`)).toHaveStyle({ width: "12%" });
+    expect(usage.querySelector(`.${styles.usageBar} span`)).toHaveStyle({
+      width: "12%",
+    });
     expect(screen.getByText("5h 19%")).toBeInTheDocument();
     expect(screen.getByText("7d 9%")).toBeInTheDocument();
     expect(screen.queryByText("$0.42")).toBeNull();
     act(() =>
       useProject.setState({
-        settings: { agents: { showContextUsage: false, showUsageLimits: false, showCost: true } },
+        settings: {
+          agents: {
+            showContextUsage: false,
+            showUsageLimits: false,
+            showCost: true,
+          },
+        },
       }),
     );
     expect(screen.queryByText("24k/200k (12%)")).toBeNull();
@@ -1440,8 +1771,20 @@ describe("sessions from other apps", () => {
 
   it("lists external sessions in the history popup and imports one as a task", async () => {
     backend.external = [
-      { provider: "claude", sessionId: "abc", title: "Login fix", cwd: "/work/app", updatedMs: Date.now() },
-      { provider: "codex", sessionId: "thread-1", title: "Add tests", cwd: null, updatedMs: 0 },
+      {
+        provider: "claude",
+        sessionId: "abc",
+        title: "Login fix",
+        cwd: "/work/app",
+        updatedMs: Date.now(),
+      },
+      {
+        provider: "codex",
+        sessionId: "thread-1",
+        title: "Add tests",
+        cwd: null,
+        updatedMs: 0,
+      },
     ];
     await openHistory();
     expect(screen.getByText("Login fix")).toBeInTheDocument();
@@ -1484,7 +1827,17 @@ describe("changes refresh", () => {
     vi.useFakeTimers();
     useChangesOptions.setState({ groupByCommit: true });
     useAgents.setState({
-      tasks: new Map([["A", { ...task("A"), isolation: "worktree", cwd: "/worktrees/a", projectRoot: "/project" }]]),
+      tasks: new Map([
+        [
+          "A",
+          {
+            ...task("A"),
+            isolation: "worktree",
+            cwd: "/worktrees/a",
+            projectRoot: "/project",
+          },
+        ],
+      ]),
     });
     render(<SessionEditor input={input("A")} />);
     await act(async () => {});
@@ -1578,12 +1931,17 @@ describe("grouped changes", () => {
   });
   const worktreeTask = () => {
     useChangesOptions.setState({ groupByCommit: true });
-    useAgents.setState({ tasks: new Map([["A", { ...task("A"), isolation: "worktree" }]]) });
+    useAgents.setState({
+      tasks: new Map([["A", { ...task("A"), isolation: "worktree" }]]),
+    });
     localStorage.setItem("openidea.agents.changesOpen.v1", JSON.stringify({ A: true }));
   };
 
   it("puts committed files under their commit and rolls back only the uncommitted ones", async () => {
-    backend.grouped = { uncommitted: [change("a.ts")], commits: [commit({ files: [change("b.ts")] })] };
+    backend.grouped = {
+      uncommitted: [change("a.ts")],
+      commits: [commit({ files: [change("b.ts")] })],
+    };
     worktreeTask();
     render(<SessionEditor input={input("A")} />);
 
@@ -1620,10 +1978,15 @@ describe("grouped changes", () => {
   });
 
   it("accepts the task's committed work too, not only the uncommitted files", async () => {
-    backend.grouped = { uncommitted: [], commits: [commit({ files: [change("b.ts")] })] };
+    backend.grouped = {
+      uncommitted: [],
+      commits: [commit({ files: [change("b.ts")] })],
+    };
     backend.changes = [change("b.ts")];
     worktreeTask();
-    useAgents.setState({ tasks: new Map([["A", { ...task("A"), isolation: "worktree", status: "ready" }]]) });
+    useAgents.setState({
+      tasks: new Map([["A", { ...task("A"), isolation: "worktree", status: "ready" }]]),
+    });
     render(<SessionEditor input={input("A")} />);
     await screen.findByText("Committed");
 

src/features/agents/taskSearch.ts

@@ -0,0 +1,14 @@
+/** Filtering the Agents task list: fuzzy on the title (highlighted), word starts on the project folder and branch. */
+import type { AgentTask } from "@/bindings";
+import { fuzzyMatch, wordMatch } from "@/ui";
+import { basename } from "@/platform/project";
+
+/** Indices of `query` in the task's title to highlight ([] when another field matched), or null when it doesn't match. */
+export function matchTask(task: AgentTask, query: string): number[] | null {
+  const q = query.trim();
+  if (!q) return [];
+  const title = fuzzyMatch(task.title, q);
+  if (title) return title;
+  const others = [task.projectRoot ? basename(task.projectRoot) : null, task.branch];
+  return others.some((text) => text && wordMatch(text, q)) ? [] : null;
+}

src/features/agents/useCompletionAnchor.ts

@@ -1,69 +0,0 @@
-import { useLayoutEffect, useState, type RefObject } from "react";
-import type { VirtualElement } from "@floating-ui/react-dom";
-import styles from "./Composer.module.css";
-
-const TEXT_STYLES = [
-  "fontFamily",
-  "fontSize",
-  "fontWeight",
-  "fontStyle",
-  "fontVariant",
-  "lineHeight",
-  "letterSpacing",
-  "wordSpacing",
-  "textIndent",
-  "textAlign",
-  "textTransform",
-  "tabSize",
-  "paddingTop",
-  "paddingRight",
-  "paddingBottom",
-  "paddingLeft",
-] as const;
-
-/** A textarea has no text DOM to measure; mirror its wrapping and scroll offset. */
-function caretRect(textarea: HTMLTextAreaElement, caret: number): DOMRect {
-  const computed = getComputedStyle(textarea);
-  const mirror = document.createElement("div");
-  mirror.className = styles.caretMirror ?? "";
-  for (const property of TEXT_STYLES) mirror.style[property] = computed[property];
-  mirror.style.width = `${textarea.clientWidth}px`;
-  mirror.textContent = textarea.value.slice(0, caret);
-  const marker = document.createElement("span");
-  marker.textContent = textarea.value.slice(caret) || "\u200b";
-  mirror.append(marker);
-  document.body.append(mirror);
-  try {
-    const box = textarea.getBoundingClientRect();
-    const lineHeight = parseFloat(computed.lineHeight) || parseFloat(computed.fontSize) * 1.5;
-    return new DOMRect(
-      box.left + textarea.clientLeft + marker.offsetLeft - textarea.scrollLeft,
-      box.top + textarea.clientTop + marker.offsetTop - textarea.scrollTop,
-      0,
-      lineHeight,
-    );
-  } finally {
-    mirror.remove();
-  }
-}
-
-export function useCompletionAnchor(
-  ref: RefObject<HTMLTextAreaElement | null>,
-  caret: number | null,
-  text: string,
-): VirtualElement | null {
-  const [anchor, setAnchor] = useState<VirtualElement | null>(null);
-  useLayoutEffect(() => {
-    const textarea = ref.current;
-    if (!textarea || caret === null) {
-      setAnchor(null);
-      return;
-    }
-    const update = () =>
-      setAnchor({ contextElement: textarea, getBoundingClientRect: () => caretRect(textarea, caret) });
-    update();
-    textarea.addEventListener("scroll", update);
-    return () => textarea.removeEventListener("scroll", update);
-  }, [ref, caret, text]);
-  return anchor;
-}

src/features/code-insight/index.ts

@@ -5,9 +5,15 @@
  */
 import { registerActions } from "@/platform/actions";
 import { useProject } from "@/platform/project";
-import { registerMenuGroup, registerOverlay, registerStatusItem, registerToolWindow } from "@/workbench/contributions";
+import {
+  registerAgentContextSource,
+  registerMenuGroup,
+  registerOverlay,
+  registerStatusItem,
+  registerToolWindow,
+} from "@/workbench/contributions";
 import { getContext } from "@/platform/context";
-import { clearProblems, installProblemsEvents, useProblems } from "./problemsStore";
+import { clearProblems, installProblemsEvents, problemsReport, useProblems } from "./problemsStore";
 import { installProblemDecorations } from "./decorations";
 import { ProblemsHeaderActions, ProblemsTabs, ProblemsView, useProblemsHeaderMenu } from "./ProblemsView";
 import { UsagesTabs, UsagesView, useUsagesHeaderMenu } from "./UsagesView";
@@ -45,6 +51,17 @@ export function activate(): () => void {
   const disposers = [
     unsubProject,
     installProblemsEvents(),
+    registerAgentContextSource({
+      id: "problems",
+      title: "Problems",
+      description: "The project's errors and warnings",
+      icon: "problems",
+      resolve: async () => {
+        const root = useProject.getState().project?.root;
+        const text = root ? problemsReport(useProblems.getState().map, root) : null;
+        return text ? { kind: "block", info: "problems", text } : null;
+      },
+    }),
     reportProblems(),
     installProblemDecorations(),
     installServerEvents(),
@@ -77,6 +94,7 @@ export function activate(): () => void {
       icon: "toolwindow-usages",
       anchor: "bottom",
       stripe: "onUse",
+      sessionContent: true,
       order: 35,
       component: UsagesView,
       headerContent: UsagesTabs,

src/features/code-insight/problemsStore.test.ts

@@ -8,6 +8,7 @@ import {
   fileDiagnostics,
   filePaths,
   mergeDiagnostics,
+  problemsReport,
   profiledProblems,
   projectCounts,
   useProblems,
@@ -134,3 +135,19 @@ describe("filePaths", () => {
     expect(filePaths(map, "/p/none.py")).toEqual([]);
   });
 });
+
+describe("problemsReport", () => {
+  it("lists errors before warnings with their places, leaving out hints, up to a limit", () => {
+    let map = mergeDiagnostics(new Map(), "/p/src/a.ts", "tsc", [d(3, "warning", "ts"), d(0, "hint")]);
+    map = mergeDiagnostics(map, "/p/src/b.ts", "tsc", [d(9, "error"), d(1, "error")]);
+    expect(problemsReport(map, "/p")).toBe(
+      [
+        "src/b.ts:2:1: error: line 1 (tsc)",
+        "src/b.ts:10:1: error: line 9 (tsc)",
+        "src/a.ts:4:1: warning: line 3 (ts)",
+      ].join("\n"),
+    );
+    expect(problemsReport(map, "/p", 1)).toBe("src/b.ts:2:1: error: line 1 (tsc)\n… 2 more");
+    expect(problemsReport(mergeDiagnostics(new Map(), "/p/a", "x", [d(0, "info")]), "/p")).toBeNull();
+  });
+});

src/features/code-insight/problemsStore.ts

@@ -188,3 +188,25 @@ export function installProblemsEvents(): () => void {
     offProfile();
   };
 }
+
+/**
+ * Errors and warnings as `rel:line:col: severity: message (source)` lines, errors first, at most
+ * `max`; null when there are none. For an agent's context.
+ */
+export function problemsReport(map: ProblemsMap, root: string, max = 60): string | null {
+  const rows: { severity: Severity; text: string }[] = [];
+  for (const path of map.keys()) {
+    const rel = path.startsWith(`${root}/`) ? path.slice(root.length + 1) : path;
+    for (const d of fileDiagnostics(map, path)) {
+      if (d.severity !== "error" && d.severity !== "warning") continue;
+      const at = `${rel}:${d.range.start.line + 1}:${d.range.start.col + 1}`;
+      const source = d.source ? ` (${d.source})` : "";
+      rows.push({ severity: d.severity, text: `${at}: ${d.severity}: ${d.message.split("\n")[0]}${source}` });
+    }
+  }
+  if (!rows.length) return null;
+  rows.sort((a, b) => Number(a.severity !== "error") - Number(b.severity !== "error"));
+  const shown = rows.slice(0, max).map((r) => r.text);
+  if (rows.length > max) shown.push(`… ${rows.length - max} more`);
+  return shown.join("\n");
+}

src/features/debugger/__tests__/attach.test.ts

@@ -19,7 +19,14 @@ import { attachConfig, attachDetail, attachRows, matchesFilter } from "../attach
 const proc = (p: Partial<AttachableProcess> & Pick<AttachableProcess, "pid" | "kind">): AttachableProcess => ({
   name: p.kind,
   commandLine: `${p.kind} app`,
-  adapter: { java: "java-debug", node: "js-debug", python: "debugpy", go: "delve", native: "codelldb" }[p.kind],
+  adapter: {
+    java: "java-debug",
+    node: "js-debug",
+    python: "debugpy",
+    dotnet: "netcoredbg",
+    go: "delve",
+    native: "codelldb",
+  }[p.kind],
   host: null,
   port: null,
   ...p,
@@ -38,6 +45,7 @@ const list = [
   }),
   proc({ pid: 25, kind: "node", name: "node", commandLine: "node server.js" }),
   proc({ pid: 26, kind: "go", name: "gosrv", commandLine: "./gosrv" }),
+  proc({ pid: 40, kind: "dotnet", name: "Api", commandLine: "./Api --urls http://localhost:5000" }),
 ];
 
 describe("Attach to Process popup model", () => {
@@ -47,6 +55,7 @@ describe("Attach to Process popup model", () => {
       "Java (JDWP):1",
       "Node.js:1",
       "Python (debugpy):2",
+      ".NET (netcoredbg):1",
       "Go (Delve):1",
       "Native (LLDB):1",
     ]);
@@ -83,6 +92,9 @@ describe("Attach to Process popup model", () => {
       address: "localhost",
     });
     expect(await extra(list[5]!)).toEqual({ mode: "local", processId: 26 });
+    const dotnet = await attachConfig(list[6]!, "/proj");
+    expect(dotnet).toMatchObject({ adapter: "netcoredbg", request: "attach" });
+    expect(JSON.parse(dotnet.extraJson!)).toMatchObject({ processId: 40 });
     const native = await attachConfig(list[0]!, "/proj");
     expect(native).toMatchObject({ adapter: "codelldb", request: "attach", name: "a.out (30)", cwd: "/proj" });
     expect(JSON.parse(native.extraJson!)).toEqual({ pid: 30 });

src/features/debugger/actions.ts

@@ -28,7 +28,13 @@ import {
 import { removeAllSpecial, specialAt, toggleFieldAt, toggleMethodAt } from "./breakpoints/special";
 import { fieldAt, methodAt } from "./breakpoints/symbols";
 import { toggleBreakpointSmart } from "./breakpoints/toggle";
-import { isJavaAttachTarget, isJavaDebuggable, javaAttachConfig, javaLaunchConfig } from "./java";
+import {
+  isJavaAttachTarget,
+  isJavaDebuggable,
+  javaAttachConfig,
+  javaLaunchConfig,
+  jvmAttachDebuggerReady,
+} from "./java";
 import { cancelHotSwapBuild, reloadChangedClasses } from "./hotswap";
 import { refreshMemory, useMemory } from "./memory/memoryState";
 import { closeInstances, instancesOutdated, showInstances, showReferrers, useInstances } from "./memory/instancesState";
@@ -478,6 +484,20 @@ export function registerDebugActions(): () => void {
           })(),
         ),
     },
+    {
+      id: "debug.jvmAttachReady",
+      title: "Check the JVM Debugger",
+      category: "Debug",
+      hidden: true,
+      description:
+        "Whether the debugger for a build tool's JVMs is installed, offering the install when not (arg: { module, retry, done(ready) })",
+      run: ({ arg }) => {
+        const a = arg as { module: string; retry: () => void; done: (ready: boolean) => void };
+        const root = useProject.getState().project?.root;
+        if (!root) return a.done(true);
+        void jvmAttachDebuggerReady(a.module, root, a.retry).then(a.done, () => a.done(true));
+      },
+    },
     {
       id: "debug.stop",
       title: "Stop",

src/features/debugger/attach.ts

@@ -10,11 +10,12 @@ export const KIND_LABELS: Record<AttachKind, string> = {
   java: "Java (JDWP)",
   node: "Node.js",
   python: "Python (debugpy)",
+  dotnet: ".NET (netcoredbg)",
   go: "Go (Delve)",
   native: "Native (LLDB)",
 };
 
-const KIND_ORDER: AttachKind[] = ["java", "node", "python", "go", "native"];
+const KIND_ORDER: AttachKind[] = ["java", "node", "python", "dotnet", "go", "native"];
 
 export type AttachRow =
   | { kind: "group"; key: string; label: string; count: number }
@@ -84,6 +85,8 @@ export async function attachConfig(p: AttachableProcess, root: string): Promise<
         // (`--pid` injection ships only an x86_64 helper on macOS.)
         p.port != null ? { debugServer: p.port, justMyCode: skip } : { processId: p.pid, justMyCode: skip },
       );
+    case "dotnet":
+      return base(p, root, { processId: p.pid, justMyCode: skip });
     case "go":
       return base(p, root, { mode: "local", processId: p.pid });
     case "native":

src/features/debugger/index.ts

@@ -73,6 +73,7 @@ export function activate(): () => void {
       icon: "toolwindow-debug",
       anchor: "bottom",
       stripe: "onUse",
+      sessionContent: true,
       order: 20,
       component: lazyComponent(() => import("./ui/DebugToolWindow").then((m) => m.DebugToolWindow)),
       headerContent: lazyComponent(() => import("./ui/DebugToolWindow").then((m) => m.DebugTabs)),

src/features/debugger/java.ts

@@ -80,6 +80,29 @@ export async function moduleHasKotlinSources(cwd: string): Promise<boolean> {
   return false;
 }
 
+/**
+ * Whether the debugger for the JVMs of `module` is installed. Maven / Gradle start those JVMs
+ * before the debugger attaches, so a missing Kotlin debugger is offered here, before the build
+ * runs: "Install and Debug" installs it and calls `retry`.
+ */
+export async function jvmAttachDebuggerReady(module: string, root: string, retry: () => void): Promise<boolean> {
+  if (!(await moduleHasKotlinSources(module ? join(root, module) : root))) return true;
+  const tools = await call(commands.toolsList()).catch(() => []);
+  if (tools.find((t) => t.name === KOTLIN_ADAPTER)?.status !== "missing") return true;
+  notifications().notify({
+    group: "run",
+    level: "warning",
+    key: "debug.start",
+    title: "The Kotlin debugger is not installed",
+    body: "This module has Kotlin sources, so debugging it needs the Kotlin debugger (kotlin-debug-adapter).",
+    sticky: true,
+    actions: [
+      { label: "Install and Debug", run: () => void executeAction("tools.install", KOTLIN_ADAPTER).then(retry) },
+    ],
+  });
+  return false;
+}
+
 /** java-debug missing from jdtls: offer the one-click install (jdtls restarts with the bundle). */
 function offerInstall(e: unknown): never {
   if (e instanceof IpcError && e.kind === "unavailable" && /java-debug|debugger/i.test(e.message)) {

src/features/project-tree/index.ts

@@ -34,6 +34,7 @@ import {
   initProjectTree,
   leadSelection,
   reloadAll,
+  reloadArchiveDirs,
   reloadLoadedDirs,
   setChangedFiles,
   setOpenFiles,
@@ -253,6 +254,7 @@ export function activate(): () => void {
     initProjectTypes(),
     onIdeEvent("fsChanged", (e) => void applyFsChange(e)),
     onIdeEvent("excludedDirsChanged", (e) => void reloadLoadedDirs(e.dirs)),
+    onIdeEvent("projectRootsChanged", () => void reloadArchiveDirs()),
   ];
   return () => {
     disposers.reverse().forEach((d) => d());

src/features/project-tree/store.test.ts

@@ -3,6 +3,7 @@ import { MemoryFs, setProjectFsForTests } from "./fs";
 import { visibleInfo } from "./model";
 import {
   applyFsChange,
+  reloadArchiveDirs,
   reloadLoadedDirs,
   currentModel,
   expandAll,
@@ -114,6 +115,28 @@ describe("refresh of excluded folders", () => {
   });
 });
 
+describe("refresh of library archives", () => {
+  it("re-reads the loaded folders inside archives only", async () => {
+    await fs.createFile("/m2/lib.jar!/p/A.class");
+    await loadDir(ROOT);
+    await loadDir("/m2/lib.jar!");
+    await loadDir("/m2/lib.jar!/p");
+    await fs.createFile("/m2/lib.jar!/p/B.class");
+    const spy = vi.spyOn(fs, "readDir");
+
+    await reloadArchiveDirs();
+
+    expect(spy.mock.calls.map(([p]) => p).sort()).toEqual(["/m2/lib.jar!", "/m2/lib.jar!/p"]);
+    expect(
+      useProjectTree
+        .getState()
+        .listings.get("/m2/lib.jar!/p")
+        ?.map((e) => e.name),
+    ).toEqual(["A.class", "B.class"]);
+    spy.mockRestore();
+  });
+});
+
 describe("refresh on ignore-rule changes", () => {
   it("refreshes loaded descendants once, preserving selection and unrelated folders", async () => {
     await fs.createFile("/p/docs/sub/note.md");

src/features/project-tree/store.ts

@@ -565,6 +565,16 @@ export async function reloadLoadedDirs(dirs: readonly string[]) {
   await Promise.all(dirs.filter((p) => listings.has(p)).map((p) => loadDir(p, true)));
 }
 
+/**
+ * Re-reads the loaded folders inside archives (`<archive>!…`): a build tool sync may have replaced
+ * a library jar in place (a SNAPSHOT installed again), which no file watcher reports.
+ */
+export async function reloadArchiveDirs() {
+  const { listings } = get();
+  const inArchive = (p: string) => p.endsWith("!") || p.includes("!/") || p.includes("!\\");
+  await Promise.all([...listings.keys()].filter(inArchive).map((p) => loadDir(p, true)));
+}
+
 /** Re-reads every loaded folder (View › Reload from Disk). */
 export async function reloadAll() {
   const { listings } = get();

src/features/run/index.ts

@@ -381,6 +381,7 @@ export function activate(): () => void {
       icon: "toolwindow-run",
       anchor: "bottom",
       stripe: "onUse",
+      sessionContent: true,
       order: 5,
       component: lazyComponent(() => import("./RunView").then((m) => m.RunView)),
       headerContent: lazyComponent(() => import("./RunView").then((m) => m.RunTabs)),

src/features/run/javaDebug.test.ts

@@ -4,6 +4,8 @@ import type { RunConfig } from "@/platform/ipc";
 const h = vi.hoisted(() => ({
   attached: [] as number[],
   onLine: null as ((line: string) => void) | null,
+  ready: true,
+  retry: null as (() => void) | null,
 }));
 vi.mock("@/platform/ipc", async (orig) => {
   const ipc = await orig<typeof import("@/platform/ipc")>();
@@ -15,8 +17,12 @@ vi.mock("@/platform/ipc", async (orig) => {
 });
 vi.mock("@/platform/actions", async (orig) => ({
   ...(await orig<typeof import("@/platform/actions")>()),
-  executeAction: async (id: string, arg: { port: number }) => {
+  executeAction: async (id: string, arg: { port: number; retry: () => void; done: (ready: boolean) => void }) => {
     if (id === "debug.attach") h.attached.push(arg.port);
+    if (id === "debug.jvmAttachReady") {
+      h.retry = arg.retry;
+      arg.done(h.ready);
+    }
     return true;
   },
 }));
@@ -44,6 +50,8 @@ const mavenTest: RunConfig = {
 beforeEach(() => {
   h.attached = [];
   h.onLine = null;
+  h.ready = true;
+  h.retry = null;
 });
 
 describe("Maven test debugging", () => {
@@ -66,4 +74,13 @@ describe("Maven test debugging", () => {
     h.onLine!("Listening for transport dt_socket at address: 50123");
     expect(h.attached).toEqual([50123]);
   });
+
+  it("doesn't start the build while the debugger is missing; its install debugs again", async () => {
+    h.ready = false;
+    expect(await debugWithAgent(mavenTest)).toBe(true);
+    expect(h.onLine).toBeNull();
+    h.ready = true;
+    h.retry!();
+    await vi.waitFor(() => expect(h.onLine).not.toBeNull());
+  });
 });

src/features/run/javaDebug.ts

@@ -150,11 +150,31 @@ function needsPinnedPort(config: RunConfig): boolean {
   return config.isTest || config.args.some(isMavenTestGoal);
 }
 
+/**
+ * Whether the debugger can attach to the JVMs `config` starts. When it isn't installed, the
+ * debugger offers the install (then debugs again) and the build isn't started for nothing.
+ */
+function attachDebuggerReady(config: RunConfig, show?: boolean): Promise<boolean> {
+  return new Promise((resolve) => {
+    executeAction("debug.jvmAttachReady", {
+      module: config.module ?? config.cwd ?? "",
+      retry: () => void debugWithAgent(config, show),
+      done: resolve,
+    }).then(
+      (ran) => {
+        if (!ran) resolve(true);
+      },
+      () => resolve(true),
+    );
+  });
+}
+
 /** Runs `config` with a JDWP agent and attaches the Java debugger to every JVM it starts. */
 export async function debugWithAgent(config: RunConfig, show?: boolean): Promise<boolean> {
   const pinned = needsPinnedPort(config) ? await call(commands.debugFreePort()).catch(() => null) : null;
   const agent = jdwpLaunch(config, pinned ?? undefined);
   if (!agent) return false;
+  if (!(await attachDebuggerReady(config, show))) return true;
   const launch = await withGradleAttachListener(agent);
   let sessionId: string | null = null;
   const waiting: number[] = [];

src/features/search/index.ts

@@ -185,6 +185,7 @@ export function activate(): void | (() => void) {
       icon: "toolwindow-find",
       anchor: "bottom",
       stripe: "onUse",
+      sessionContent: true,
       order: 5,
       component: lazyComponent(() => import("./find/FindToolWindow").then((m) => m.FindToolWindow)),
       headerContent: lazyComponent(() => import("./find/FindToolWindow").then((m) => m.FindTabs)),

src/features/settings/__tests__/deploymentFtpPassword.test.tsx

@@ -0,0 +1,87 @@
+import { cleanup, fireEvent, render, screen, waitFor } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { DEFAULT_DEPLOYMENT_SERVER } from "@/platform/remoteSettings";
+import { useProject } from "@/platform/project";
+import { PageContext } from "../components/context";
+import { validateSettings } from "../model/schema";
+import { applySettings, openSettings, useSettingsDialog } from "../model/staging";
+import { DEPLOYMENT_PAGES } from "../pages/deployment";
+
+const mocks = vi.hoisted(() => ({ store: vi.fn(), saved: vi.fn(), test: vi.fn() }));
+vi.mock("@/platform/ipc", async (original) => {
+  const actual = await original<typeof import("@/platform/ipc")>();
+  return {
+    ...actual,
+    isTauri: () => true,
+    commands: {
+      ...actual.commands,
+      sshSetSecret: mocks.store,
+      sshPasswordSaved: mocks.saved,
+      deployTestConnection: mocks.test,
+    },
+  };
+});
+
+const option = DEPLOYMENT_PAGES[0]!.sections![0]!.options[0]!;
+if (option.kind !== "custom") throw new Error("Deployment editor missing");
+const Editor = option.component;
+const savedDialog = useSettingsDialog.getState();
+const savedProject = useProject.getState();
+const PAGE = DEPLOYMENT_PAGES[0]!.id;
+
+beforeEach(() => {
+  vi.resetAllMocks();
+  mocks.store.mockResolvedValue(undefined);
+  mocks.saved.mockResolvedValue(false);
+  mocks.test.mockResolvedValue({ status: "ok", data: null });
+});
+afterEach(() => {
+  cleanup();
+  useSettingsDialog.setState(savedDialog, true);
+  useProject.setState(savedProject, true);
+});
+
+function mount() {
+  const server = {
+    ...DEFAULT_DEPLOYMENT_SERVER,
+    id: "srv",
+    name: "Web",
+    kind: "ftp",
+    ftp: { host: "ftp.example.com", port: null, user: "web", passive: true },
+  };
+  const settings = validateSettings({ deployment: { servers: [server] } });
+  useProject.setState({ settings, project: null });
+  openSettings(PAGE);
+  return render(
+    <PageContext.Provider value={{ pageId: PAGE, scope: "global" }}>
+      <Editor />
+    </PageContext.Provider>,
+  );
+}
+
+describe("FTP deployment password", () => {
+  it("tests the connection with the typed password and saves it on Apply", async () => {
+    mount();
+    fireEvent.change(screen.getByLabelText("Password"), { target: { value: "s3cret" } });
+    fireEvent.click(screen.getByText("Test Connection"));
+    await waitFor(() => expect(mocks.test).toHaveBeenCalled());
+    expect(mocks.test.mock.calls[0]![2]).toBe("s3cret");
+    expect(mocks.store).not.toHaveBeenCalled();
+    fireEvent.click(screen.getByLabelText("Save password"));
+    expect(await applySettings()).toBe(true);
+    expect(mocks.store).toHaveBeenCalledWith("ftp:srv", "s3cret", true);
+  });
+
+  it("shows a stored password and forgets it when Save password is cleared", async () => {
+    mocks.saved.mockResolvedValue(true);
+    mount();
+    await waitFor(() =>
+      expect(screen.getByLabelText("Password").getAttribute("placeholder")).toBe("Password already stored"),
+    );
+    const save = screen.getByLabelText("Save password") as HTMLInputElement;
+    expect(save.checked).toBe(true);
+    fireEvent.click(save);
+    expect(await applySettings()).toBe(true);
+    expect(mocks.store).toHaveBeenCalledWith("ftp:srv", null, false);
+  });
+});

src/features/settings/pages/deployment.tsx

@@ -5,7 +5,7 @@
  */
 import { useEffect, useId, useState, type KeyboardEvent } from "react";
 import clsx from "clsx";
-import { call, commands, IpcError, type FsConnection, type RemoteEntry } from "@/platform/ipc";
+import { call, commands, IpcError, isTauri, type FsConnection, type RemoteEntry } from "@/platform/ipc";
 import { useTx, tx, txTemplate } from "@/platform/i18n";
 import { useProject } from "@/platform/project";
 import {
@@ -33,7 +33,7 @@ import {
 } from "@/ui";
 import { GlobListEditor, Row } from "../components/Form";
 import { SshConfigSelect, useSshConfigs } from "../components/SshConfigSelect";
-import { useSetting } from "../components/context";
+import { usePageContext, useSetting, useSettingsFormFor } from "../components/context";
 import {
   addMapping,
   fixDefaultServer,
@@ -291,10 +291,52 @@ function TextField({
   );
 }
 
-function FtpRows({ ftp, update }: { ftp: FtpConnectionValid; update: (patch: Partial<FtpConnectionValid>) => void }) {
+interface FtpPassword {
+  password: string;
+  save: boolean;
+}
+
+/** The FTP password, staged like a setting and written to the saved passwords on Apply. */
+function useFtpPassword(secretKey: string, ftp: boolean) {
+  const page = usePageContext();
+  const form = useSettingsFormFor(page.pageId, page.scope);
+  const [known, setKnown] = useState<{ key: string; saved: boolean } | null>(null);
+  const saved = known?.key === secretKey && known.saved;
+  useEffect(() => {
+    let live = true;
+    if (ftp && isTauri())
+      void commands.sshPasswordSaved(secretKey).then(
+        (stored) => live && setKnown({ key: secretKey, saved: stored }),
+        () => {},
+      );
+    return () => {
+      live = false;
+    };
+  }, [secretKey, ftp]);
+  const base: FtpPassword = { password: "", save: saved };
+  const value = form.useExternal<FtpPassword>(`ftpPassword.${secretKey}`, base, async ({ password, save }) => {
+    if (password) await commands.sshSetSecret(secretKey, password, save);
+    else if (!save) await commands.sshSetSecret(secretKey, null, false);
+    const stored = password ? save : save && saved;
+    setKnown({ key: secretKey, saved: stored });
+    return { password: "", save: stored };
+  });
+  return { ...value, saved };
+}
+
+function FtpRows({
+  ftp,
+  secret,
+  update,
+}: {
+  ftp: FtpConnectionValid;
+  secret: ReturnType<typeof useFtpPassword>;
+  update: (patch: Partial<FtpConnectionValid>) => void;
+}) {
   const hostId = useId();
   const portId = useId();
   const userId = useId();
+  const passwordId = useId();
   const tx = useTx();
   // What is typed (e.g. an invalid port); the editor is keyed by server.
   const [portText, setPortText] = useState(ftp.port?.toString() ?? "");
@@ -335,6 +377,24 @@ function FtpRows({ ftp, update }: { ftp: FtpConnectionValid; update: (patch: Par
           onChange={(e) => update({ user: e.target.value })}
         />
       </Row>
+      <Row label="Password" htmlFor={passwordId}>
+        <Input
+          id={passwordId}
+          type="password"
+          autoComplete="off"
+          className={styles.wide}
+          value={secret.value.password}
+          placeholder={secret.saved && !secret.value.password ? tx("Password already stored") : undefined}
+          onChange={(e) => secret.set({ ...secret.value, password: e.target.value })}
+        />
+      </Row>
+      <div className={styles.option}>
+        <Checkbox
+          checked={secret.value.save}
+          onChange={(save) => secret.set({ ...secret.value, save })}
+          label="Save password"
+        />
+      </div>
       <div className={styles.option}>
         <Checkbox checked={ftp.passive} onChange={(passive) => update({ passive })} label="Passive mode" />
       </div>
@@ -357,7 +417,11 @@ function ConnectionTab({
   const [browsing, setBrowsing] = useState(false);
   const [result, setTest] = useState<TestState | null>(null);
   const connection = deploymentConnection(server);
-  const testKey = JSON.stringify([server.kind, server.sshConfig, server.ftp, server.rootPath]);
+  const ftp = server.kind === "ftp" || server.kind === "ftps";
+  const secret = useFtpPassword(deploymentSecretKey(server), ftp);
+  // A password typed but not applied yet is what Test Connection logs in with.
+  const typedPassword = (ftp && secret.value.password) || null;
+  const testKey = JSON.stringify([server.kind, server.sshConfig, server.ftp, server.rootPath, typedPassword]);
   const test = result?.ssh === testKey ? result : null;
   const rootId = useId();
 
@@ -365,7 +429,7 @@ function ConnectionTab({
     const ssh = testKey;
     setTest({ ssh, kind: "busy" });
     try {
-      await call(commands.deployTestConnection(connection, server.rootPath.trim() || "~"));
+      await call(commands.deployTestConnection(connection, server.rootPath.trim() || "~", typedPassword));
       setTest({ ssh, kind: "ok", count: 0 });
     } catch (e) {
       setTest({ ssh, kind: "error", error: e });
@@ -396,8 +460,8 @@ function ConnectionTab({
           </PageLink>
         </Row>
       )}
-      {(server.kind === "ftp" || server.kind === "ftps") && (
-        <FtpRows ftp={server.ftp} update={(patch) => update({ ftp: { ...server.ftp, ...patch } })} />
+      {ftp && (
+        <FtpRows ftp={server.ftp} secret={secret} update={(patch) => update({ ftp: { ...server.ftp, ...patch } })} />
       )}
       <Row label="Root path" htmlFor={rootId} hint="Mappings' deployment paths are relative to this folder.">
         <span className={styles.field}>
@@ -886,6 +950,8 @@ export const DEPLOYMENT_PAGES: PageSpec[] = [
               "SSH configuration",
               "FTP",
               "Passive mode",
+              "Password",
+              "Save password",
               "Test Connection",
               "Use as Default",
               "Server Group",

src/features/settings/pages/editor/colorScheme.tsx

@@ -10,6 +10,7 @@ import { fontWeightVars, type CustomColorSchemes, type TextAttributesOverride }
 import {
   ATTRIBUTES,
   SCHEMES,
+  EFFECT_CSS,
   overrideDeclarations,
   effectiveScheme,
   resolvedSchemeTokens,
@@ -123,6 +124,8 @@ function previewVars(
       k.startsWith("--border-") ||
       k.startsWith("--ansi-") ||
       k.startsWith("--git-") ||
+      k.startsWith("--wave-") ||
+      k.startsWith("--editor-") ||
       k === "--caret"
     )
       vars[k] = v;
@@ -137,20 +140,32 @@ function previewVars(
 
 /** Text styled like an attribute in the preview. */
 function tokenStyle(attr: AttributeDef | undefined): CSSProperties {
-  if (!attr?.token)
-    return {
+  const base = attr?.fg ?? attr?.effect;
+  if (!attr?.token) {
+    const colour: CSSProperties = {
       ...(attr?.fg ? { color: `var(${attr.fg})` } : null),
       ...(attr?.bg ? { backgroundColor: `var(${attr.bg})` } : null),
-      // Token-less attributes with a font-style renderer carry it on `--<fg>-*`, the same
-      // declarations `overrideDeclarations` emits for their overrides.
-      ...(attr?.fontStyle && (attr.fg ?? attr.effect)
-        ? {
-            fontWeight: `var(${attr.fg ?? attr.effect}-bold, inherit)`,
-            fontStyle: `var(${attr.fg ?? attr.effect}-italic, inherit)`,
-            textDecoration: `var(${attr.effect ?? attr.fg}-effect, none)`,
-          }
+    };
+    // Token-less attributes with a font-style renderer carry it on `--<fg|effect>-*`, the same
+    // declarations `overrideDeclarations` emits for their overrides.
+    if (!attr?.fontStyle || !base) return colour;
+    const effectColor = `var(${attr.effect ?? attr.fg ?? "--fg-muted"})`;
+    const effect: TextAttributesOverride["effect"] = attr.defaultEffect ?? (attr.effect ? "wave" : undefined);
+    const decoration =
+      effect && effect !== "none"
+        ? `var(${attr.effect ?? base}-effect, ${EFFECT_CSS[effect]?.(effectColor) ?? "none"})`
+        : undefined;
+    return {
+      ...colour,
+      fontWeight: `var(${base}-bold, ${
+        attr.defaultBold ? "var(--fw-code-bold, 700)" : "inherit"
+      })` as CSSProperties["fontWeight"],
+      fontStyle: `var(${base}-italic, ${attr.defaultItalic ? "italic" : "inherit"})`,
+      ...(decoration
+        ? { textDecoration: decoration, ...({ WebkitTextDecoration: decoration } as CSSProperties) }
         : null),
     };
+  }
   if (attr.italicOnly)
     return { fontStyle: `var(--syn-${attr.token}-italic, ${attr.defaultItalic === false ? "normal" : "italic"})` };
   const t = attr.token;
@@ -206,6 +221,11 @@ const SAMPLES: Record<string, CodeSample> = {
         ["   ", "text"],
         ["legacyCall", "unused"],
       ],
+      [
+        ["typo", "typo"],
+        ["   ", "text"],
+        ["deprecatedCall", "deprecated"],
+      ],
       [
         ["bad\u203dchar", "invalid"],
         ["   \u00b7   ", "whitespaces"],

src/features/settings/pages/editor/general.tsx

@@ -701,6 +701,7 @@ const SMART_KEYS = editorPage({
         { t: "check", key: `${P}.smartKeys.pairQuotes`, label: "Insert pair quote" },
         { t: "check", key: `${P}.smartKeys.surroundSelection`, label: "Surround selection on typing quote or brace" },
         { t: "check", key: `${P}.smartKeys.tabOutOfPair`, label: "Jump outside closing bracket/quote with Tab" },
+        { t: "check", key: `${P}.smartKeys.simultaneousTagEditing`, label: "Simultaneous <tag></tag> editing" },
         {
           t: "select",
           key: `${P}.smartKeys.reformatOnPaste`,