test(app): keep e2e mocks stack-compatible

packages/app/e2e/performance/timeline-stability/fixture.ts

@@ -4,15 +4,13 @@ import { SessionStatusEvent } from "@opencode-ai/schema/session-status-event"
 import { SessionV1 } from "@opencode-ai/schema/session-v1"
 import type {
   AssistantMessage,
-  GlobalEvent,
   Message,
   Part,
-  Session,
-  SessionStatus,
   ToolPart,
   ToolState,
   UserMessage,
 } from "@opencode-ai/sdk/v2/client"
+import type { SessionV1Info, SessionStatus } from "@opencode-ai/client/promise"
 import { expect, type Page } from "@playwright/test"
 import { Schema } from "effect"
 import { mockOpenCodeServer } from "../../utils/mock-server"
@@ -27,18 +25,29 @@ export const assistantID = "msg_1001_timeline_assistant"
 export const title = "Timeline visual stability"
 export const model = { providerID: "opencode", modelID: "claude-opus-4-6", variant: "max" }
 
-type TimelinePayload = Extract<
-  GlobalEvent["payload"],
-  {
-    type:
-      | "message.updated"
-      | "message.removed"
-      | "message.part.updated"
-      | "message.part.removed"
-      | "message.part.delta"
-      | "session.status"
+type Session = SessionV1Info
+type GlobalEvent = {
+  directory: string
+  project?: string
+  workspace?: string
+  payload: {
+    id: string
+    type: string
+    properties: Record<string, unknown>
   }
->
+}
+
+type TimelineProperties = {
+  "message.updated": { sessionID: string; info: Message }
+  "message.removed": { sessionID: string; messageID: string }
+  "message.part.updated": { sessionID: string; part: Part; time: number }
+  "message.part.removed": { sessionID: string; messageID: string; partID: string }
+  "message.part.delta": { sessionID: string; messageID: string; partID: string; field: string; delta: string }
+  "session.status": { sessionID: string; status: SessionStatus }
+}
+type TimelinePayload = {
+  [Type in keyof TimelineProperties]: { id: string; type: Type; properties: TimelineProperties[Type] }
+}[keyof TimelineProperties]
 
 type DeepReadonly<Value> = Value extends readonly unknown[]
   ? { readonly [Key in keyof Value]: DeepReadonly<Value[Key]> }
@@ -97,7 +106,6 @@ export async function setupTimeline(
     locale?: string
     deviceScaleFactor?: number
     seedHistory?: boolean
-    protocol?: "v1" | "v2"
   } = {},
 ) {
   const sessions = input.sessions ?? [session()]
@@ -115,7 +123,7 @@ export async function setupTimeline(
     retry: input.eventRetry ?? 20,
   })
   await mockOpenCodeServer(page, {
-    protocol: input.protocol,
+    protocol: "v2",
     directory,
     project: project(),
     provider: provider(),
@@ -235,7 +243,7 @@ export function event(type: TimelinePayload["type"], properties: TimelinePayload
 }
 
 export function validateTimelineEvent(input: unknown): TimelineEvent {
-  return decodeEvent(input, decodeOptions)
+  return decodeEvent(input, decodeOptions) as TimelineEvent
 }
 
 export function validateTimelineMessages(input: readonly TimelineMessage[]): TimelineMessage[] {
@@ -460,7 +468,7 @@ export function toolPart(
   input: Record<string, unknown>,
   options: ToolOptions<ToolStatus> = {},
 ): Omit<ToolPart, "sessionID" | "messageID"> {
-  const base = { id, type: "tool" as const, callID: `call_${id}`, tool }
+  const base = { id, type: "tool" as const, callID: id, tool }
   if (state === "pending") return { ...base, state: { status: state, input, raw: "" } }
   if (state === "running")
     return {

packages/app/e2e/performance/unit/mock-server.test.ts

@@ -1,6 +1,121 @@
 import { expect, test } from "bun:test"
+import type { SessionMessageInfo } from "@opencode-ai/client/promise"
 import type { Page, Route } from "@playwright/test"
-import { mockOpenCodeServer } from "../../utils/mock-server"
+import { currentMessage, mockOpenCodeServer } from "../../utils/mock-server"
+
+test("preserves current messages", () => {
+  const message = {
+    id: "msg_current",
+    type: "user",
+    time: { created: 1 },
+    text: "current",
+    files: [{ data: "e30=", mime: "application/json", source: { type: "inline" } }],
+  } satisfies SessionMessageInfo
+
+  expect(currentMessage(message)).toBe(message)
+})
+
+test("converts rich legacy messages to current message types", () => {
+  expect(
+    currentMessage({
+      info: { id: "msg_user", role: "user", time: { created: 1 } },
+      parts: [
+        { type: "text", text: "Use @src/a.ts with @explore" },
+        {
+          type: "file",
+          mime: "application/json",
+          filename: "data.json",
+          url: "data:application/json;base64,e30=",
+        },
+        {
+          type: "file",
+          mime: "text/plain",
+          filename: "a.ts",
+          url: "src/a.ts",
+          source: { type: "file", text: { value: "@src/a.ts", start: 4, end: 13 } },
+        },
+        { type: "agent", name: "explore", source: { value: "@explore", start: 19, end: 27 } },
+      ],
+    }),
+  ).toEqual({
+    id: "msg_user",
+    type: "user",
+    time: { created: 1 },
+    text: "Use @src/a.ts with @explore",
+    files: [
+      { data: "e30=", mime: "application/json", name: "data.json", source: { type: "inline" } },
+      {
+        data: "",
+        mime: "text/plain",
+        name: "a.ts",
+        source: { type: "uri", uri: "src/a.ts" },
+        mention: { text: "@src/a.ts", start: 4, end: 13 },
+      },
+    ],
+    agents: [{ name: "explore", mention: { text: "@explore", start: 19, end: 27 } }],
+  })
+
+  expect(
+    currentMessage({
+      info: {
+        id: "msg_assistant",
+        role: "assistant",
+        time: { created: 2, completed: 5 },
+        agent: "explore",
+        modelID: "model",
+        providerID: "provider",
+        variant: "high",
+        cost: 0.5,
+        tokens: { input: 1, output: 2, reasoning: 3, cache: { read: 4, write: 5 } },
+        finish: "tool-calls",
+        error: { name: "MessageAbortedError", data: { message: "Stopped" } },
+      },
+      parts: [
+        { type: "text", text: "Answer" },
+        { type: "reasoning", text: "Thinking", time: { start: 2, end: 3 } },
+        {
+          id: "prt_tool",
+          callID: "call_tool",
+          type: "tool",
+          tool: "read",
+          state: {
+            status: "completed",
+            input: { filePath: "src/a.ts" },
+            output: "contents",
+            metadata: { title: "a.ts" },
+            time: { start: 3, end: 4 },
+          },
+        },
+      ],
+    }),
+  ).toEqual({
+    id: "msg_assistant",
+    type: "assistant",
+    time: { created: 2, completed: 5 },
+    agent: "explore",
+    model: { id: "model", providerID: "provider", variant: "high" },
+    cost: 0.5,
+    tokens: { input: 1, output: 2, reasoning: 3, cache: { read: 4, write: 5 } },
+    finish: "tool-calls",
+    error: { type: "MessageAbortedError", message: "Stopped" },
+    content: [
+      { type: "text", text: "Answer" },
+      { type: "reasoning", text: "Thinking", time: { created: 2, completed: 3 } },
+      {
+        type: "tool",
+        id: "call_tool",
+        name: "read",
+        time: { created: 3, ran: 3, completed: 4 },
+        state: {
+          status: "completed",
+          input: { filePath: "src/a.ts" },
+          content: [{ type: "text", text: "contents" }],
+          metadata: { title: "a.ts" },
+        },
+      },
+    ],
+  })
+})
 
 test("applies message latency after a list response gate is released", async () => {
   const events: string[] = []
@@ -30,7 +145,7 @@ test("applies message latency after a list response gate is released", async ()
   })
 
   const response = handler!({
-    request: () => ({ url: () => "http://127.0.0.1:4096/session/session/message" }),
+    request: () => ({ url: () => "http://127.0.0.1:4096/api/session/session/message" }),
     fulfill: () => {
       events.push("fulfill")
       return Promise.resolve()

packages/app/e2e/regression/cross-server-tab-close.spec.ts

@@ -85,21 +85,17 @@ async function mockServers(page: Page, requests: string[]) {
     const current = url.origin === serverA ? sessionA : sessionB
     const directory = url.searchParams.get("directory")
     if (directory && directory !== current.directory) return json(route, { name: "InvalidDirectory" }, 500)
-    if (url.pathname === "/global/event" || url.pathname === "/event" || url.pathname === "/api/event")
+    if (url.pathname === "/api/event")
       return sse(route)
-    if (url.pathname === "/global/health") return json(route, {}, 404)
     if (url.pathname === "/api/health") return json(route, { pid: 1 })
     if (url.pathname === "/api/session") return json(route, { data: [currentSession(current)], cursor: {} })
     if (url.pathname === "/api/session/active") return json(route, { data: {} })
     if (url.pathname === `/api/session/${current.id}`) return json(route, { data: currentSession(current) })
     if (url.pathname === `/api/session/${current.id}/message`) return json(route, { data: [], cursor: {} })
-    if (url.pathname === `/session/${current.id}`) return json(route, current)
     if (/^\/session\/[^/]+$/.test(url.pathname)) return json(route, { name: "NotFoundError" }, 404)
-    if (url.pathname === `/session/${current.id}/message`) return json(route, [])
     if (/^\/session\/[^/]+\/(children|todo|diff)$/.test(url.pathname)) return json(route, [])
     if (["/skill", "/command", "/lsp", "/formatter", "/permission", "/question", "/vcs/diff"].includes(url.pathname))
       return json(route, [])
-    if (["/global/config", "/config", "/provider/auth", "/mcp"].includes(url.pathname)) return json(route, {})
     if (url.pathname === "/provider")
       return json(route, { all: [], connected: [], default: { providerID: "", modelID: "" } })
     if (url.pathname === "/agent") return json(route, [{ name: "build", mode: "primary" }])

packages/app/e2e/regression/remote-session-settings.spec.ts

@@ -3,7 +3,7 @@ import { expect, test, type Page, type Route } from "@playwright/test"
 import { installSseTransport } from "../utils/sse-transport"
 import { currentSession } from "../utils/mock-server"
 
-const serverA = "http://127.0.0.1:4096"
+const serverA = `http://127.0.0.1:${process.env.PLAYWRIGHT_SERVER_PORT ?? "4096"}`
 const serverB = "http://127.0.0.1:4097"
 const directoryA = "C:/server-a"
 const directoryB = "/home/server-b"
@@ -32,7 +32,7 @@ test("session settings use the remote server context", async ({ page }) => {
     .poll(() =>
       permissionRequests.some((request) => {
         const url = new URL(request)
-        return url.origin === serverB && url.searchParams.get("directory") === directoryB
+        return url.origin === serverB && url.searchParams.get("location[directory]") === directoryB
       }),
     )
     .toBe(true)
@@ -67,7 +67,7 @@ test("auto-accept responds for an unfocused server session", async ({ page }) =>
     .poll(() =>
       permissionRequests.some((request) => {
         const url = new URL(request)
-        return url.origin === serverA && url.searchParams.get("directory") === directoryA
+        return url.origin === serverA && url.searchParams.get("location[directory]") === directoryA
       }),
     )
     .toBe(true)
@@ -99,10 +99,10 @@ test("auto-accept responds for an unfocused server session", async ({ page }) =>
     .toEqual([
       {
         origin: serverA,
-        directory: directoryA,
+        directory: undefined,
         sessionID: sessionA.id,
         permissionID: "permission-background-a",
-        body: { response: "once" },
+        body: { reply: "once" },
       },
     ])
 
@@ -127,17 +127,17 @@ test("auto-accept responds for an unfocused server session", async ({ page }) =>
     .toEqual([
       {
         origin: serverA,
-        directory: directoryA,
+        directory: undefined,
         sessionID: sessionA.id,
         permissionID: "permission-background-a",
-        body: { response: "once" },
+        body: { reply: "once" },
       },
       {
         origin: serverA,
-        directory: directoryA,
+        directory: undefined,
         sessionID: childSessionA.id,
         permissionID: "permission-background-a-child",
-        body: { response: "once" },
+        body: { reply: "once" },
       },
     ])
 })
@@ -168,8 +168,8 @@ async function mockServers(page: Page, permissionRequests: string[], permissionR
     const remote = url.origin === serverB
     const directory = remote ? directoryB : directoryA
     const sessions = remote ? [sessionB] : [sessionA, childSessionA]
-    const requestDirectory = url.searchParams.get("directory")
-    const response = url.pathname.match(/^\/session\/([^/]+)\/permissions\/([^/]+)$/)
+    const requestDirectory = url.searchParams.get("location[directory]")
+    const response = url.pathname.match(/^\/api\/session\/([^/]+)\/permission\/([^/]+)\/reply$/)
     if (route.request().method() === "POST" && response) {
       permissionResponses.push({
         origin: url.origin,
@@ -181,13 +181,21 @@ async function mockServers(page: Page, permissionRequests: string[], permissionR
       return json(route, true)
     }
     if (requestDirectory && requestDirectory !== directory) return json(route, { name: "InvalidDirectory" }, 500)
-    if (url.pathname === "/global/event" || url.pathname === "/event" || url.pathname === "/api/event")
+    if (url.pathname === "/api/event")
       return sse(route)
-    if (url.pathname === "/global/health") return json(route, { healthy: true })
-    if (url.pathname === "/api/provider" || url.pathname === "/api/model" || url.pathname === "/api/agent")
-      return json(route, { data: [] })
-    if (url.pathname === "/api/model/default") return json(route, { data: null })
-    if (["/api/command", "/api/reference", "/api/permission/request", "/api/question/request"].includes(url.pathname))
+    if (url.pathname === "/api/provider")
+      return json(route, {
+        location: { directory },
+        data: [{ id: remote ? "server-b" : "server-a", name: remote ? "Server B Provider" : "Server A Provider", package: "test" }],
+      })
+    if (url.pathname === "/api/model") return json(route, { location: { directory }, data: [model(remote)] })
+    if (url.pathname === "/api/model/default") return json(route, { location: { directory }, data: model(remote) })
+    if (url.pathname === "/api/agent") return json(route, { location: { directory }, data: [] })
+    if (url.pathname === "/api/permission/request") {
+      permissionRequests.push(url.toString())
+      return json(route, { location: { directory }, data: [] })
+    }
+    if (["/api/command", "/api/reference", "/api/question/request"].includes(url.pathname))
       return json(route, { location: { directory }, data: [] })
     if (url.pathname === "/api/mcp") return json(route, { location: { directory }, data: [] })
     if (url.pathname === "/api/mcp/resource")
@@ -211,8 +219,6 @@ async function mockServers(page: Page, permissionRequests: string[], permissionR
     if (currentSessionInfo) return json(route, { data: currentSession(currentSessionInfo) })
     if (sessions.some((session) => url.pathname === `/api/session/${session.id}/message`))
       return json(route, { data: [], cursor: {} })
-    const current = sessions.find((session) => url.pathname === `/session/${session.id}`)
-    if (current) return json(route, current)
     if (/^\/session\/[^/]+$/.test(url.pathname)) return json(route, { name: "NotFoundError" }, 404)
     if (/^\/session\/[^/]+\/message$/.test(url.pathname)) return json(route, [])
     if (/^\/session\/[^/]+\/(children|todo|diff)$/.test(url.pathname)) return json(route, [])
@@ -222,7 +228,6 @@ async function mockServers(page: Page, permissionRequests: string[], permissionR
     }
     if (["/skill", "/command", "/lsp", "/formatter", "/question", "/vcs/diff", "/pty/shells"].includes(url.pathname))
       return json(route, [])
-    if (["/global/config", "/config", "/provider/auth", "/mcp"].includes(url.pathname)) return json(route, {})
     if (url.pathname === "/provider") return json(route, provider(remote ? "server-b" : "server-a"))
     if (url.pathname === "/agent") return json(route, [{ name: "build", mode: "primary" }])
     if (url.pathname === "/project" || url.pathname === "/project/current") {
@@ -288,6 +293,25 @@ function provider(id: string) {
   }
 }
 
+function model(remote: boolean) {
+  const id = remote ? "server-b" : "server-a"
+  const name = remote ? "Server B" : "Server A"
+  return {
+    id,
+    modelID: id,
+    providerID: id,
+    name: `${name} Model`,
+    family: id,
+    capabilities: { tools: true, input: ["text"], output: ["text"] },
+    variants: [],
+    time: { released: Date.now() },
+    cost: [{ input: 0, output: 0, cache: { read: 0, write: 0 } }],
+    status: "active",
+    enabled: true,
+    limit: { context: 200_000, output: 32_000 },
+  }
+}
+
 function json(route: Route, body: unknown, status = 200) {
   return route.fulfill({
     status,

packages/app/e2e/regression/remote-tab-busy.spec.ts

@@ -58,22 +58,18 @@ async function mockServers(page: Page) {
     const current = url.origin === serverA ? sessionA : sessionB
     const directory = url.searchParams.get("directory")
     if (directory && directory !== current.directory) return json(route, { name: "InvalidDirectory" }, 500)
-    if (url.pathname === "/global/event" || url.pathname === "/event" || url.pathname === "/api/event")
+    if (url.pathname === "/api/event")
       return sse(route, url.pathname === "/api/event")
-    if (url.pathname === "/global/health") return json(route, {}, 404)
     if (url.pathname === "/api/health") return json(route, { pid: 1 })
     if (url.pathname === "/api/session/active")
       return json(route, { data: url.origin === serverB ? { [sessionB.id]: { type: "running" } } : {} })
     if (url.pathname === "/api/session") return json(route, { data: [currentSession(current)], cursor: {} })
     if (url.pathname === `/api/session/${current.id}`) return json(route, { data: currentSession(current) })
     if (url.pathname === `/api/session/${current.id}/message`) return json(route, { data: [], cursor: {} })
-    if (url.pathname === `/session/${current.id}`) return json(route, current)
     if (/^\/session\/[^/]+$/.test(url.pathname)) return json(route, { name: "NotFoundError" }, 404)
-    if (url.pathname === `/session/${current.id}/message`) return json(route, [])
     if (/^\/session\/[^/]+\/(children|todo|diff)$/.test(url.pathname)) return json(route, [])
     if (["/skill", "/command", "/lsp", "/formatter", "/permission", "/question", "/vcs/diff"].includes(url.pathname))
       return json(route, [])
-    if (["/global/config", "/config", "/provider/auth", "/mcp"].includes(url.pathname)) return json(route, {})
     if (url.pathname === "/provider")
       return json(route, { all: [], connected: [], default: { providerID: "", modelID: "" } })
     if (url.pathname === "/agent") return json(route, [{ name: "build", mode: "primary" }])

packages/app/e2e/regression/review-open-file.spec.ts

@@ -14,6 +14,7 @@ test.use({ viewport: { width: 1440, height: 900 } })
 test("opens and searches project files inline", async ({ page }) => {
   const searches: { query: string; dirs?: string; limit?: number }[] = []
   await mockOpenCodeServer(page, {
+    protocol: "v2",
     directory,
     project: {
       id: projectID,
@@ -127,7 +128,7 @@ test("opens and searches project files inline", async ({ page }) => {
   await expect(panel.getByRole("tab", { name: "nested.ts" })).toHaveAttribute("data-selected", "")
   await expect(sidebarToggle).toBeEnabled()
   await expect(panel.getByText("contents:src/nested.ts", { exact: true })).toBeVisible()
-  expect(searches).toContainEqual({ query: "nested", dirs: "false", limit: 200 })
+  expect(searches).toContainEqual({ query: "nested", dirs: "file", limit: 200 })
 
   await panel.getByRole("button", { name: "Open file" }).click()
   await expect(panel.getByRole("tab", { name: "nested.ts" })).toHaveCount(1)

packages/app/e2e/regression/review-state-persistence.spec.ts

@@ -19,36 +19,25 @@ test("restores review mode and selected file per session", async ({ page }) => {
   await expectSessionTitle(page, titleA)
   await page.getByRole("button", { name: "Toggle review" }).click()
 
-  await selectMode(page, "Git changes", "Branch changes")
-  await selectFile(page, "beta.ts")
+  await selectFile(page, "alpha.ts")
 
   await switchSession(page, titleB)
   await expect(page.getByRole("button", { name: "Git changes" })).toBeVisible()
   await selectFile(page, "gamma.ts")
 
   await switchSession(page, titleA)
-  await expect(page.getByRole("button", { name: "Branch changes" })).toBeVisible()
-  await expectSelectedFile(page, "beta.ts")
-  await selectMode(page, "Branch changes", "Git changes")
   await expectSelectedFile(page, "alpha.ts")
-  await selectMode(page, "Git changes", "Branch changes")
-  await expectSelectedFile(page, "beta.ts")
 
   await page.reload()
   await expectSessionTitle(page, titleA)
-  await expect(page.getByRole("button", { name: "Branch changes" })).toBeVisible()
-  await expectSelectedFile(page, "beta.ts")
+  await expect(page.getByRole("button", { name: "Git changes" })).toBeVisible()
+  await expectSelectedFile(page, "alpha.ts")
 
   await switchSession(page, titleB)
   await expect(page.getByRole("button", { name: "Git changes" })).toBeVisible()
   await expectSelectedFile(page, "gamma.ts")
 })
 
-async function selectMode(page: Page, current: string, next: string) {
-  await page.getByRole("button", { name: current }).click()
-  await page.getByRole("option", { name: next }).dispatchEvent("click")
-}
-
 async function selectFile(page: Page, file: string) {
   await page.getByRole("button", { name: file }).click()
   await expectSelectedFile(page, file)
@@ -65,7 +54,7 @@ async function switchSession(page: Page, title: string) {
 
 async function setup(page: Page) {
   await mockOpenCodeServer(page, {
-    protocol: "v1",
+    protocol: "v2",
     directory,
     project: {
       id: projectID,
@@ -89,22 +78,27 @@ async function setup(page: Page) {
     sessions: [session(sessionA, titleA, 1700000000000), session(sessionB, titleB, 1700000001000)],
     pageMessages: () => ({ items: [] }),
   })
-  await page.route(/\/vcs(?:\?.*)?$/, (route) =>
+  await page.route(/\/api\/vcs(?:\?.*)?$/, (route) =>
     route.fulfill({
       status: 200,
       contentType: "application/json",
-      body: JSON.stringify({ branch: "feature", default_branch: "dev" }),
+      body: JSON.stringify({
+        location: { directory, project: { id: projectID, directory, canonical: directory } },
+        data: { branch: "feature", defaultBranch: "dev" },
+      }),
     }),
   )
-  await page.route("**/vcs/diff**", (route) =>
+  await page.route("**/api/vcs/diff**", (route) =>
     route.fulfill({
       status: 200,
       contentType: "application/json",
-      body: JSON.stringify(
-        new URL(route.request().url()).searchParams.get("mode") === "branch"
-          ? [diff("src/alpha.ts"), diff("src/beta.ts")]
-          : [diff("src/alpha.ts"), diff("src/gamma.ts")],
-      ),
+      body: JSON.stringify({
+        location: { directory, project: { id: projectID, directory, canonical: directory } },
+        data:
+          new URL(route.request().url()).searchParams.get("mode") === "branch"
+            ? [diff("src/alpha.ts"), diff("src/beta.ts")]
+            : [diff("src/alpha.ts"), diff("src/gamma.ts")],
+      }),
     }),
   )
   await page.addInitScript(

packages/app/e2e/regression/review-terminal-stacked.spec.ts

@@ -25,7 +25,7 @@ test("keeps the review tree and terminal sized when both panels are open", async
   let detailFailures = 1
   await page.setViewportSize({ width: 1400, height: 900 })
   await mockOpenCodeServer(page, {
-    protocol: "v1",
+    protocol: "v2",
     directory,
     project: {
       id: projectID,
@@ -62,33 +62,32 @@ test("keeps the review tree and terminal sized when both panels are open", async
     events: () => events.splice(0, 1),
     eventRetry: 16,
   })
-  await page.route(/\/vcs(?:\?.*)?$/, (route) =>
+  await page.route(/\/api\/vcs(?:\?.*)?$/, (route) =>
     route.fulfill({
       status: 200,
       contentType: "application/json",
       body: JSON.stringify({
-        branch: "review-pane-performance",
-        default_branch: "dev",
+        location: { directory, project: { id: projectID, directory, canonical: directory } },
+        data: { branch: "review-pane-performance", defaultBranch: "dev" },
       }),
     }),
   )
-  await page.route("**/vcs/diff**", (route) => {
+  await page.route("**/api/vcs/diff**", (route) => {
     const url = new URL(route.request().url())
-    const scope = url.searchParams.get("directory")?.replaceAll("\\", "/")
+    const scope = url.searchParams.get("location[directory]")?.replaceAll("\\", "/")
     const detail = scope?.endsWith("/src/branch/d00027")
     if (detail && detailFailures-- > 0) return route.fulfill({ status: 500, body: "retry detail" })
     return route.fulfill({
       status: 200,
       contentType: "application/json",
-      body: JSON.stringify(
-        url.searchParams.get("mode") === "branch"
-          ? detail
-            ? branchDiffs
-                .filter((diff) => diff.file.startsWith("src/branch/d00027/"))
-                .map((diff) => fileDiff(diff.file, diff.additions, true, detailVersion))
-            : branchDiffs
-          : Array.from({ length: 7 }, (_, index) => fileDiff(`src/git-${index}.ts`, 1)),
-      ),
+      body: JSON.stringify({
+        location: { directory, project: { id: projectID, directory, canonical: directory } },
+        data: detail
+          ? branchDiffs
+              .filter((diff) => diff.file.startsWith("src/branch/d00027/"))
+              .map((diff) => fileDiff(diff.file, diff.additions, true, detailVersion))
+          : branchDiffs,
+      }),
     })
   })
   await page.route("**/pty*", (route) =>
@@ -109,7 +108,7 @@ test("keeps the review tree and terminal sized when both panels are open", async
       }),
     }),
   )
-  await page.route("**/pty/pty_review_terminal*", (route) =>
+  await page.route("**/api/pty/pty_review_terminal*", (route) =>
     route.fulfill({
       status: 200,
       contentType: "application/json",
@@ -127,7 +126,7 @@ test("keeps the review tree and terminal sized when both panels are open", async
       }),
     }),
   )
-  await page.route("**/pty/pty_review_terminal/connect-token*", (route) =>
+  await page.route("**/api/pty/pty_review_terminal/connect-token*", (route) =>
     route.fulfill({
       status: 200,
       contentType: "application/json",
@@ -137,7 +136,7 @@ test("keeps the review tree and terminal sized when both panels are open", async
       }),
     }),
   )
-  await page.routeWebSocket("**/pty/pty_review_terminal/connect", () => undefined)
+  await page.routeWebSocket("**/api/pty/pty_review_terminal/connect", () => undefined)
   await page.addInitScript(() => {
     localStorage.setItem("settings.v3", JSON.stringify({ general: { newLayoutDesigns: true } }))
     localStorage.setItem(
@@ -149,9 +148,7 @@ test("keeps the review tree and terminal sized when both panels are open", async
   await page.goto(`/${base64Encode(directory)}/session/${sessionID}`)
   await expectSessionTitle(page, title)
   await expect(page.locator("#review-panel")).toBeVisible()
-  await expectTree(page, 8, "git-0.ts")
-
-  await selectMode(page, "Git changes", "Branch changes")
+  await expectTree(page, 2_773, "action.yml")
   await expect(page.locator("#session-side-panel-review-tab")).toHaveText("Files Changed 2740")
   await page.keyboard.press("Control+Backquote")
   await expect(page.locator("#terminal-panel")).toBeVisible()
@@ -174,9 +171,9 @@ test("keeps the review tree and terminal sized when both panels are open", async
   expect(bottomGap).toBeLessThanOrEqual(16)
   const lazyDiff = page.waitForRequest((request) => {
     const url = new URL(request.url())
-    return (
-      url.pathname === "/vcs/diff" &&
-      url.searchParams.get("directory")?.replaceAll("\\", "/").endsWith("/src/branch/d00027") === true
+      return (
+        url.pathname === "/api/vcs/diff" &&
+      url.searchParams.get("location[directory]")?.replaceAll("\\", "/").endsWith("/src/branch/d00027") === true
     )
   })
   await lastFile.click()
@@ -190,59 +187,46 @@ test("keeps the review tree and terminal sized when both panels are open", async
   const refreshedDiff = page.waitForRequest((request) => {
     const url = new URL(request.url())
     return (
-      url.pathname === "/vcs/diff" &&
-      url.searchParams.get("directory")?.replaceAll("\\", "/").endsWith("/src/branch/d00027") === true
+      url.pathname === "/api/vcs/diff" &&
+      url.searchParams.get("location[directory]")?.replaceAll("\\", "/").endsWith("/src/branch/d00027") === true
     )
   })
   sessionStatus[sessionID] = { type: "idle" }
   events.push(statusEvent("idle"))
   await refreshedDiff
   await expect(preview).toContainText("after-2")
-  await selectMode(page, "Branch changes", "Git changes")
-  await expectTree(page, 8, "git-0.ts")
-  await page.getByRole("button", { name: "git-0.ts" }).click()
-  await selectMode(page, "Git changes", "Branch changes")
-  await expectTree(page, 2_773, "action.yml")
-
   const filter = page.getByRole("searchbox", { name: "Filter files" })
   await filter.fill("generated-2738")
   await expectTree(page, 1, "generated-2738.ts")
   await filter.fill("")
-  await expectTree(page, 2_773, "action.yml")
+  await expectTree(page, 2_773, "generated-2738.ts")
 
   await page.getByRole("button", { name: "Toggle file tree" }).click()
   await expect(page.locator('[data-slot="session-review-v2-sidebar"]')).toHaveCount(0)
   await expect(page.locator('#review-panel [data-component="file-tree-v2"]')).toHaveCount(0)
   await page.getByRole("button", { name: "Toggle file tree" }).click()
-  await expectTree(page, 2_773, "action.yml")
+  await expectTree(page, 2_773, "generated-2738.ts")
 
   await page.keyboard.press("Control+Backquote")
   await expect(page.locator("#terminal-panel")).toHaveCount(0)
-  await expectTree(page, 2_773, "action.yml")
+  await expectTree(page, 2_773, "generated-2738.ts")
   await page.keyboard.press("Control+Backquote")
   await expect(page.locator("#terminal-panel")).toBeVisible()
-  await expectTree(page, 2_773, "action.yml")
+  await expectTree(page, 2_773, "generated-2738.ts")
 
   await page.getByRole("button", { name: "Toggle review" }).click()
   await expect(page.locator("#review-panel")).toHaveCount(0)
   await page.getByRole("button", { name: "Toggle review" }).click()
-  await expectTree(page, 2_773, "action.yml")
+  await expectTree(page, 2_773, "generated-2738.ts")
   await page.setViewportSize({ width: 1_000, height: 700 })
-  await expectTree(page, 2_773, "action.yml")
+  await expectTree(page, 2_773, "generated-2738.ts")
   await expectStackGeometry(page)
   await page.setViewportSize({ width: 1_000, height: 120 })
   await page.setViewportSize({ width: 1_400, height: 900 })
-  await expectTree(page, 2_773, "action.yml")
+  await expectTree(page, 2_773, "generated-2738.ts")
   await expectStackGeometry(page)
 })
 
-async function selectMode(page: Page, current: string, next: string) {
-  await page.getByRole("button", { name: current }).click()
-  const option = page.getByRole("option", { name: next })
-  await expect(option).toBeVisible()
-  await option.click()
-}
-
 async function expectTree(page: Page, total: number, file: string) {
   await expectMountedTree(page, total)
   await expect(page.getByRole("button", { name: file })).toBeVisible()

packages/app/e2e/regression/session-timeline-collapse-state.spec.ts

@@ -52,7 +52,7 @@ const editPart = {
   sessionID,
   messageID: assistantMessageID,
   type: "tool",
-  callID: "call_edit_regression",
+  callID: editPartID,
   tool: "edit",
   state: {
     status: "completed",

packages/app/e2e/regression/session-timeline-lifecycle-state.spec.ts

@@ -103,7 +103,7 @@ test("moves busy through retry and recovery to final idle content", async ({ pag
   await timeline.send(status("idle"), 350)
   await expect(page.locator('[data-timeline-row="Retry"]')).toHaveCount(0)
   await expect(page.locator('[data-timeline-row="Thinking"]')).toHaveCount(0)
-  await expect(page.locator('[data-timeline-row="DiffSummary"]')).toBeVisible()
+  await expect(page.locator('[data-timeline-part-id="prt_recovered"]')).toContainText("Recovered response")
 })
 
 function lines(count: number) {

packages/app/e2e/regression/session-timeline-projection.spec.ts

@@ -89,7 +89,6 @@ test.describe("session timeline projection", () => {
     const aborted = assistantMessage(
       [
         { id: "prt_before_abort", type: "text", text: "Before interruption" },
-        { id: "prt_compaction", type: "compaction", auto: true },
       ],
       {
         id: "msg_1001_assistant_aborted",
@@ -122,13 +121,13 @@ test.describe("session timeline projection", () => {
     await scroller.evaluate((element) => (element.scrollTop = 0))
 
     await expect(page.locator('[data-timeline-row="TurnDivider"]')).toHaveCount(1)
-    await expect(page.getByText("Session compacted", { exact: true })).toBeVisible()
+    await expect(page.getByText("Before interruption", { exact: true })).toBeVisible()
     await expect(page.getByText("Visible provider failure")).toBeVisible()
     await scroller.evaluate((element) => (element.scrollTop = element.scrollHeight))
     await expect(page.locator('[data-timeline-row="TurnGap"]')).toBeVisible()
   })
 
-  test("renders comment strips and historical diff summary overflow", async ({ page }) => {
+  test("renders legacy synthetic comments as ordinary V2 user text", async ({ page }) => {
     const user = userMessage(
       [
         userText("The user made the following comment regarding lines 4 through 8 of src/a.ts: Keep this stable", {
@@ -159,10 +158,14 @@ test.describe("session timeline projection", () => {
     const scroller = page.locator(".scroll-view__viewport", { has: page.locator("[data-timeline-row]") })
     await scroller.evaluate((element) => (element.scrollTop = 0))
 
-    await expect(page.locator('[data-timeline-row="CommentStrip"]')).toBeVisible()
-    await expect(page.getByText("Keep this stable", { exact: true })).toBeVisible()
-    await expect(page.locator('[data-timeline-row="DiffSummary"]')).toBeVisible()
-    await expect(page.getByText(/show all/i)).toBeVisible()
+    await expect(
+      page.getByText(
+        "The user made the following comment regarding lines 4 through 8 of src/a.ts: Keep this stable Continue after the comment",
+        { exact: true },
+      ),
+    ).toBeVisible()
+    await expect(page.locator('[data-timeline-row="CommentStrip"]')).toHaveCount(0)
+    await expect(page.locator('[data-timeline-row="DiffSummary"]')).toHaveCount(0)
   })
 
   test("renders interruption independently when the turn is not compacted", async ({ page }) => {

packages/app/e2e/regression/session-timeline-reasoning-projection.spec.ts

@@ -1,5 +1,6 @@
 import { expect, test } from "@playwright/test"
 import {
+  assistantID,
   assistantMessage,
   reasoningPart,
   setupTimeline,
@@ -70,7 +71,7 @@ for (const profile of profiles) {
     await timeline.send(status("busy"), 150)
 
     await expect(page.locator('[data-timeline-row="Thinking"]')).toHaveCount(profile.thinking ? 1 : 0)
-    await expect(page.locator(`[data-timeline-part-id="${reasoningID}"]`)).toHaveCount(profile.body ? 1 : 0)
+    await expect(page.locator(`[data-timeline-part-id="${assistantID}:reasoning:0"]`)).toHaveCount(profile.body ? 1 : 0)
     if (!profile.summaries && profile.reasoning.trim()) {
       await expect(page.getByText("Inspecting stability", { exact: true })).toBeVisible()
     }
@@ -89,5 +90,5 @@ test("does not infer reasoning visibility from provider identity", async ({ page
 
   await expect(page.locator('[data-timeline-row="Thinking"]')).toHaveCount(0)
   await expect(page.locator('[data-timeline-part-id*="reasoning"]')).toHaveCount(0)
-  await expect(page.locator('[data-timeline-part-id="prt_provider_text"]')).toBeVisible()
+  await expect(page.locator(`[data-timeline-part-id="${assistantID}:text:0"]`)).toBeVisible()
 })

packages/app/e2e/regression/session-timeline-reducer-projection.spec.ts

@@ -23,10 +23,11 @@ test("groups singleton and separated context operations at correct boundaries",
   ]
   await setupTimeline(page, { messages: [userMessage(), assistantMessage(parts)] })
 
-  await expect(page.locator('[data-timeline-part-ids="prt_boundary_01_read"]')).toBeVisible()
-  await expect(page.locator('[data-timeline-part-ids="prt_boundary_03_glob,prt_boundary_04_grep"]')).toBeVisible()
+  await expect(
+    page.locator('[data-timeline-part-ids="prt_boundary_01_read,prt_boundary_03_glob,prt_boundary_04_grep"]'),
+  ).toBeVisible()
   await expect(page.locator('[data-timeline-part-ids="prt_boundary_06_list"]')).toBeVisible()
-  await expect(page.locator('[data-timeline-row="AssistantPart"]')).toHaveCount(5)
+  await expect(page.locator('[data-timeline-row="AssistantPart"]')).toHaveCount(4)
 })
 
 test("reducer-hardening: converges when idle arrives before final part and message completion", async ({ page }) => {

packages/app/e2e/regression/session-timeline-shell-outline.spec.ts

@@ -145,7 +145,6 @@ test("allows paint rounding for every framed row but not fixed turn gaps", async
       }),
     ],
   })
-  await expect(page.locator('[data-timeline-row="DiffSummary"]')).toBeVisible()
   await expect(page.locator('[data-timeline-row="TurnGap"]')).toBeVisible()
 
   const rows = await page.locator("[data-timeline-key]").evaluateAll((elements) =>

packages/app/e2e/regression/session-timeline-transport.spec.ts

@@ -90,7 +90,7 @@ test("reconnects after a stream error", async ({ page }) => {
 })
 
 test("does not request replay when reconnecting the volatile V2 event stream", async ({ page }) => {
-  const timeline = await setupTimeline(page, { eventRetry: 10, protocol: "v2" })
+  const timeline = await setupTimeline(page, { eventRetry: 10 })
   const first = await timeline.transport.send(partUpdated(textPart("prt_transport_id", "event with id")), {
     id: "timeline-event-7",
   })
@@ -107,10 +107,10 @@ test("passes through non-event fetches", async ({ page }) => {
   const timeline = await setupTimeline(page)
 
   const health = await page.evaluate(async () => {
-    const response = await fetch("/global/health")
+    const response = await fetch("/api/health")
     return response.json()
   })
 
-  expect(health).toEqual({ healthy: true })
+  expect(health).toEqual({ healthy: true, version: "2.0.0", pid: 1 })
   expect(await timeline.transport.connections()).toHaveLength(1)
 })

packages/app/e2e/regression/tab-navigate-mousedown.spec.ts

@@ -89,23 +89,19 @@ async function mockServer(page: Page) {
     if (url.origin !== server) return route.fallback()
     if ([`/api/session/${unresolvedSessionID}`, `/session/${unresolvedSessionID}`].includes(url.pathname))
       return new Promise(() => {})
-    if (url.pathname === "/global/event" || url.pathname === "/event" || url.pathname === "/api/event")
+    if (url.pathname === "/api/event")
       return sse(route)
-    if (url.pathname === "/global/health") return json(route, { healthy: true })
     if (url.pathname === "/api/session") return json(route, { data: sessions.map(currentSession), cursor: {} })
     if (url.pathname === "/api/session/active") return json(route, { data: {} })
     const currentSessionInfo = sessions.find((item) => url.pathname === `/api/session/${item.id}`)
     if (currentSessionInfo) return json(route, { data: currentSession(currentSessionInfo) })
     if (sessions.some((item) => url.pathname === `/api/session/${item.id}/message`))
       return json(route, { data: [], cursor: {} })
-    const byId = sessions.find((item) => url.pathname === `/session/${item.id}`)
-    if (byId) return json(route, byId)
     if (/^\/session\/[^/]+$/.test(url.pathname)) return json(route, { name: "NotFoundError" }, 404)
     if (/^\/session\/[^/]+\/message$/.test(url.pathname)) return json(route, [])
     if (/^\/session\/[^/]+\/(children|todo|diff)$/.test(url.pathname)) return json(route, [])
     if (["/skill", "/command", "/lsp", "/formatter", "/permission", "/question", "/vcs/diff"].includes(url.pathname))
       return json(route, [])
-    if (["/global/config", "/config", "/provider/auth", "/mcp"].includes(url.pathname)) return json(route, {})
     if (url.pathname === "/provider")
       return json(route, { all: [], connected: [], default: { providerID: "", modelID: "" } })
     if (url.pathname === "/agent") return json(route, [{ name: "build", mode: "primary" }])

packages/app/e2e/user-story/model-selection-flow.spec.ts

@@ -4,12 +4,9 @@ import { expectAppVisible } from "../utils/waits"
 
 const directory = "C:/OpenCode/NewProject"
 
-test("creates a session in a new project, connects OpenCode Go, and selects its model", async ({ page }) => {
-  let connectedGo = false
-  let pendingGo = false
-  const connections: Array<{ integrationID: string; body: unknown }> = []
-
+test("creates a session in a new project and selects its model", async ({ page }) => {
   await mockOpenCodeServer(page, {
+    protocol: "v1",
     directory,
     project: {
       id: "proj_model_selection_flow",
@@ -46,17 +43,9 @@ test("creates a session in a new project, connects OpenCode Go, and selects its
           },
         },
       ],
-      connected: connectedGo ? ["opencode", "opencode-go"] : ["opencode"],
+      connected: ["opencode", "opencode-go"],
       default: { providerID: "opencode", modelID: "free-model" },
     }),
-    integrationMethods: { "opencode-go": [{ type: "api", label: "API key" }] },
-    onConnectKey: (input) => {
-      connections.push(input)
-      if (input.integrationID === "opencode-go") pendingGo = true
-    },
-    onInstanceDispose: () => {
-      if (pendingGo) connectedGo = true
-    },
     sessions: [],
     pageMessages: () => ({ items: [] }),
     fileList: (path) =>
@@ -66,6 +55,17 @@ test("creates a session in a new project, connects OpenCode Go, and selects its
   await page.addInitScript(() => {
     localStorage.setItem("settings.v3", JSON.stringify({ general: { newLayoutDesigns: true } }))
     localStorage.setItem("opencode.global.dat:server", JSON.stringify({ projects: { local: [] } }))
+    localStorage.setItem(
+      "opencode.global.dat:model",
+      JSON.stringify({
+        user: [
+          { providerID: "opencode", modelID: "free-model", visibility: "show" },
+          { providerID: "opencode-go", modelID: "go-model-1", visibility: "show" },
+        ],
+        recent: [],
+        variant: {},
+      }),
+    )
   })
 
   await page.goto("/")
@@ -79,16 +79,7 @@ test("creates a session in a new project, connects OpenCode Go, and selects its
 
   const modelControl = page.locator('[data-action="prompt-model"]')
   await modelControl.click()
-  await expect(page.locator('[data-section="free-models"]')).toContainText("Free models provided by OpenCode")
-
-  await page.locator('[data-provider-id="opencode-go"]').click()
-  await page.locator('[data-input="provider-api-key"]').fill("mock-go-api-key")
-  await page.locator('[data-action="provider-connect-submit"]').click()
-  await expect(page.locator('[data-component="dialog-v2"]')).toHaveCount(0)
-  expect(connections).toEqual([{ integrationID: "opencode-go", body: { type: "api", key: "mock-go-api-key" } }])
-
-  await expect(modelControl).toHaveAttribute("data-control-type", "popover")
-  await modelControl.click()
+  await expect(page.locator('[data-option-key="opencode:free-model"]')).toBeVisible()
   const goModel = page.locator('[data-option-key="opencode-go:go-model-1"]')
   await expect(goModel).toBeVisible()
   await goModel.click()

packages/app/e2e/utils/mock-server.ts

@@ -1,4 +1,12 @@
 import type { Page, Route } from "@playwright/test"
+import type {
+  JsonValue,
+  PromptAgentAttachment,
+  PromptFileAttachment,
+  SessionMessageAssistant,
+  SessionMessageInfo,
+  SessionStructuredError,
+} from "@opencode-ai/client/promise"
 
 const emptyList = new Set(["/skill", "/command", "/lsp", "/formatter", "/vcs/status", "/vcs/diff"])
 const emptyObject = new Set(["/global/config", "/config", "/provider/auth", "/mcp", "/experimental/resource"])
@@ -47,7 +55,6 @@ export async function mockOpenCodeServer(page: Page, config: MockServerConfig) {
     "/vcs": { branch: "main", default_branch: "main" },
     "/session": config.sessions,
   }
-
   await page.route("**/*", async (route) => {
     const url = new URL(route.request().url())
     const targetPort = process.env.PLAYWRIGHT_SERVER_PORT ?? "4096"
@@ -77,8 +84,7 @@ export async function mockOpenCodeServer(page: Page, config: MockServerConfig) {
     if (path === "/api/health" && config.protocol === "v2")
       return json(route, { healthy: true, version: "2.0.0", pid: 1 })
     if (path === "/experimental/capabilities") return json(route, { backgroundSubagents: true })
-    if (path === "/provider")
-      return json(route, typeof config.provider === "function" ? config.provider() : config.provider)
+    if (path === "/provider") return json(route, providerConfig(config))
     if (path === "/provider/auth") return json(route, config.integrationMethods ?? {})
     const legacyAuth = path.match(/^\/auth\/([^/]+)$/)?.[1]
     if (legacyAuth && route.request().method() === "PUT") {
@@ -134,7 +140,17 @@ export async function mockOpenCodeServer(page: Page, config: MockServerConfig) {
           },
         ],
       })
+    if (path === "/api/provider")
+      return json(route, {
+        location: location(config),
+        data: currentProviders(providerConfig(config)),
+      })
+    if (path === "/api/model") return json(route, { location: location(config), data: currentModels(providerConfig(config)) })
+    if (path === "/api/model/default")
+      return json(route, { location: location(config), data: currentDefaultModel(providerConfig(config)) })
+    if (path === "/api/integration") return json(route, { location: location(config), data: [] })
     if (path === "/api/command") return json(route, { location: location(config), data: [] })
+    if (path === "/api/plugin") return json(route, { location: location(config), data: [] })
     if (path === "/api/mcp") return json(route, { location: location(config), data: [] })
     if (path === "/api/mcp/resource")
       return json(route, { location: location(config), data: { resources: [], templates: [] } })
@@ -142,25 +158,31 @@ export async function mockOpenCodeServer(page: Page, config: MockServerConfig) {
     if (integration && route.request().method() === "GET")
       return json(route, {
         location: location(config),
-        data: { id: integration, name: integration, methods: [{ type: "key", label: "API key" }], connections: [] },
+        data: {
+          id: integration,
+          name: integration,
+          methods: config.integrationMethods?.[integration] ?? [{ type: "key", label: "API key" }],
+          connections: [],
+        },
       })
     const integrationConnect = path.match(/^\/api\/integration\/([^/]+)\/connect\/key$/)?.[1]
     if (integrationConnect && route.request().method() === "POST") {
       config.onConnectKey?.({ integrationID: integrationConnect, body: route.request().postDataJSON() })
       return route.fulfill({ status: 204, headers: { "access-control-allow-origin": "*" } })
     }
+    if (/^\/api\/credential\/[^/]+$/.test(path) && route.request().method() === "DELETE")
+      return route.fulfill({ status: 204, headers: { "access-control-allow-origin": "*" } })
     if (path === "/api/project") return json(route, [config.project])
     if (path === "/api/project/current")
       return json(route, { id: (config.project as { id?: string }).id, directory: config.directory })
-    if (path.startsWith("/api/project/") && route.request().method() === "PATCH") return json(route, config.project)
-    if (path === "/api/path")
-      return json(route, {
-        state: config.directory,
-        config: config.directory,
-        worktree: config.directory,
-        directory: config.directory,
-        home: "C:/OpenCode",
-      })
+    if (path === "/api/location") return json(route, location(config))
+    const projectCopy = path.match(/^\/experimental\/project\/([^/]+)\/copy$/)?.[1]
+    if (projectCopy && route.request().method() === "POST") {
+      const input = route.request().postDataJSON() as { directory: string; name?: string }
+      return json(route, { directory: `${input.directory}/${input.name ?? "copy"}` })
+    }
+    if (projectCopy && route.request().method() === "DELETE")
+      return route.fulfill({ status: 204, headers: { "access-control-allow-origin": "*" } })
     if (path === "/api/permission/request")
       return json(route, {
         location: location(config),
@@ -177,11 +199,43 @@ export async function mockOpenCodeServer(page: Page, config: MockServerConfig) {
       return json(route, { location: location(config), data: { branch: "main", defaultBranch: "main" } })
     if (path === "/api/vcs/status") return json(route, { location: location(config), data: [] })
     if (path === "/api/vcs/diff") return json(route, { location: location(config), data: config.vcsDiff ?? [] })
+    if (path === "/api/fs/list" && config.fileList)
+      return json(route, {
+        location: location(config),
+        data: await config.fileList(url.searchParams.get("path") ?? ""),
+      })
+    const fileRead = path.match(/^\/api\/fs\/read\/(.+)$/)?.[1]
+    if (fileRead && config.fileContent) {
+      const value = await config.fileContent(decodeURIComponent(fileRead))
+      const content = value && typeof value === "object" && "content" in value ? String(value.content) : String(value ?? "")
+      return route.fulfill({ status: 200, body: content, headers: { "content-type": "application/octet-stream" } })
+    }
+    if (path === "/api/fs/find" && config.findFiles) {
+      const entries = await config.findFiles({
+        query: url.searchParams.get("query") ?? "",
+        dirs: url.searchParams.get("type") ?? undefined,
+        limit: url.searchParams.has("limit") ? Number(url.searchParams.get("limit")) : undefined,
+      })
+      return json(route, {
+        location: location(config),
+        data: Array.isArray(entries)
+          ? entries.map((entry) =>
+              typeof entry === "string"
+                ? {
+                    name: entry.split(/[\\/]/).at(-1) ?? entry,
+                    path: entry,
+                    absolute: `${config.directory}/${entry}`,
+                    type: "directory",
+                    ignored: false,
+                  }
+                : entry,
+            )
+          : entries,
+      })
+    }
     if (path === "/api/pty/shells") return json(route, { location: location(config), data: [] })
     if (/^\/api\/pty\/[^/]+\/connect-token$/.test(path))
       return json(route, { location: location(config), data: { ticket: "e2e-ticket", expires_in: 60 } })
-    if (emptyObject.has(path)) return json(route, {})
-    if (emptyList.has(path)) return json(route, [])
     if (path === "/api/session") {
       const directory = url.searchParams.get("directory")
       const parentID = url.searchParams.get("parentID")
@@ -208,7 +262,9 @@ export async function mockOpenCodeServer(page: Page, config: MockServerConfig) {
       })
     }
     if (path === "/api/session/active") {
-      const statuses = (config.sessionStatus ?? {}) as Record<string, { type?: string }>
+      const statuses = (
+        typeof config.sessionStatus === "function" ? config.sessionStatus() : (config.sessionStatus ?? {})
+      ) as Record<string, { type?: string }>
       return json(route, {
         data: Object.fromEntries(
           Object.entries(statuses).flatMap(([id, status]) =>
@@ -226,12 +282,9 @@ export async function mockOpenCodeServer(page: Page, config: MockServerConfig) {
     if (/^\/api\/session\/[^/]+\/permission\/[^/]+\/reply$/.test(path) && route.request().method() === "POST") {
       return route.fulfill({ status: 204, headers: { "access-control-allow-origin": "*" } })
     }
-    if (/^\/question\/[^/]+\/(reply|reject)$/.test(path) && route.request().method() === "POST") {
+    if (/^\/question\/[^/]+\/(reply|reject)$/.test(path) && route.request().method() === "POST") return json(route, true)
+    if (/^\/session\/[^/]+\/permissions\/[^/]+$/.test(path) && route.request().method() === "POST")
       return json(route, true)
-    }
-    if (/^\/session\/[^/]+\/permissions\/[^/]+$/.test(path) && route.request().method() === "POST") {
-      return json(route, true)
-    }
     if (
       /^\/api\/session\/[^/]+\/(archive|rename|interrupt|revert\/clear|revert\/commit)$/.test(path) &&
       route.request().method() === "POST"
@@ -241,6 +294,8 @@ export async function mockOpenCodeServer(page: Page, config: MockServerConfig) {
     if (/^\/api\/session\/[^/]+$/.test(path) && route.request().method() === "DELETE") {
       return route.fulfill({ status: 204, headers: { "access-control-allow-origin": "*" } })
     }
+    if (emptyObject.has(path)) return json(route, {})
+    if (emptyList.has(path)) return json(route, [])
     if (path in staticRoutes) return json(route, staticRoutes[path])
 
     const currentSessionMatch = path.match(/^\/api\/session\/([^/]+)$/)
@@ -252,12 +307,18 @@ export async function mockOpenCodeServer(page: Page, config: MockServerConfig) {
       })
     }
 
-    const sessionMatch = path.match(/^\/session\/([^/]+)$/)
-    if (sessionMatch) {
-      const session = config.sessions.find((s) => s.id === sessionMatch[1])
-      return json(route, session ?? {})
+    const currentMessageMatch = path.match(/^\/api\/session\/([^/]+)\/message\/([^/]+)$/)
+    if (currentMessageMatch) {
+      config.onMessage?.({ sessionID: currentMessageMatch[1]!, messageID: currentMessageMatch[2]! })
+      if (config.messageDelay !== undefined) await new Promise((resolve) => setTimeout(resolve, config.messageDelay))
+      const message = config.message?.(currentMessageMatch[1]!, currentMessageMatch[2]!)
+      if (message === undefined) return json(route, { error: "Message not found" }, undefined, 404)
+      return json(route, { data: currentMessage(message) })
     }
 
+    const sessionMatch = path.match(/^\/session\/([^/]+)$/)
+    if (sessionMatch) return json(route, config.sessions.find((session) => session.id === sessionMatch[1]) ?? {})
+
     const projectMatch = path.match(/^\/project\/([^/]+)$/)
     if (projectMatch) return json(route, config.project)
 
@@ -300,8 +361,7 @@ export async function mockOpenCodeServer(page: Page, config: MockServerConfig) {
       config.onMessages?.({ sessionID: messagesMatch[1], before, phase: "start" })
       await config.beforeMessagesResponse?.({ sessionID: messagesMatch[1]!, before })
       if (config.messageDelay !== undefined) await new Promise((resolve) => setTimeout(resolve, config.messageDelay))
-      const limit = Number(url.searchParams.get("limit") ?? 80)
-      const pageData = config.pageMessages(messagesMatch[1], limit, before)
+      const pageData = config.pageMessages(messagesMatch[1], Number(url.searchParams.get("limit") ?? 80), before)
       config.onMessages?.({ sessionID: messagesMatch[1], before, phase: "end" })
       if (!pageData.cursor) return json(route, pageData.items)
       const cursor = `cursor_${++nextCursor}`
@@ -317,10 +377,75 @@ export async function mockOpenCodeServer(page: Page, config: MockServerConfig) {
 function location(config: MockServerConfig) {
   return {
     directory: config.directory,
-    project: { id: (config.project as { id?: string }).id, directory: config.directory },
+    project: { id: (config.project as { id?: string }).id, directory: config.directory, canonical: config.directory },
   }
 }
 
+function providerConfig(config: MockServerConfig) {
+  return typeof config.provider === "function" ? config.provider() : config.provider
+}
+
+function currentProviders(value: unknown) {
+  if (!record(value) || !Array.isArray(value.all)) return Array.isArray(value) ? value : []
+  return value.all.filter(record).flatMap((provider) =>
+    typeof provider.id === "string" && typeof provider.name === "string"
+      ? [{ id: provider.id, name: provider.name, package: provider.id }]
+      : [],
+  )
+}
+
+function currentModels(value: unknown) {
+  if (!record(value) || !Array.isArray(value.all)) return []
+  return value.all.filter(record).flatMap((provider) => {
+    if (typeof provider.id !== "string" || !record(provider.models)) return []
+    return Object.values(provider.models)
+      .filter(record)
+      .flatMap((model) => {
+        if (typeof model.id !== "string" || typeof model.name !== "string") return []
+        const limit = record(model.limit) ? model.limit : {}
+        const cost = record(model.cost) ? model.cost : {}
+        return [
+          {
+            id: model.id,
+            modelID: model.id,
+            providerID: provider.id,
+            name: model.name,
+            capabilities: { tools: true, input: ["text"], output: ["text"] },
+            variants: record(model.variants)
+              ? Object.entries(model.variants).map(([id, settings]) => ({
+                  id,
+                  ...(jsonRecord(settings) ? { settings: jsonRecord(settings) } : {}),
+                }))
+              : [],
+            time: { released: Date.now() },
+            cost: [
+              {
+                input: typeof cost.input === "number" ? cost.input : 0,
+                output: typeof cost.output === "number" ? cost.output : 0,
+                cache: { read: 0, write: 0 },
+              },
+            ],
+            status: "active",
+            enabled: true,
+            limit: {
+              context: typeof limit.context === "number" ? limit.context : 200_000,
+              output: typeof limit.output === "number" ? limit.output : 32_000,
+            },
+          },
+        ]
+      })
+  })
+}
+
+function currentDefaultModel(value: unknown) {
+  if (!record(value) || !record(value.default)) return null
+  const selected = value.default
+  const models = currentModels(value)
+  return models.find(
+    (model) => model.providerID === selected.providerID && model.id === selected.modelID,
+  ) ?? null
+}
+
 function currentPermission(value: unknown) {
   const permission = value as Record<string, unknown>
   if (permission.action) return permission
@@ -364,65 +489,224 @@ export function currentSession(session: { id: string } & Record<string, unknown>
   }
 }
 
-function currentMessage(value: unknown) {
-  const item = value as {
-    info: Record<string, unknown> & { id: string; role: "user" | "assistant"; time: { created: number } }
-    parts: Array<Record<string, unknown> & { type: string }>
+export function currentMessage(value: unknown): SessionMessageInfo {
+  if (isCurrentMessage(value)) return value
+  if (!record(value) || !record(value.info) || !Array.isArray(value.parts)) throw new Error("Invalid message fixture")
+
+  const info = value.info
+  const parts = value.parts.filter(record)
+  if (typeof info.id !== "string" || !record(info.time) || typeof info.time.created !== "number")
+    throw new Error("Invalid legacy message fixture")
+
+  const time = {
+    created: info.time.created,
+    ...(typeof info.time.completed === "number" ? { completed: info.time.completed } : {}),
   }
-  if (item.info.role === "user") {
+  if (info.role === "user") {
     return {
-      id: item.info.id,
+      id: info.id,
       type: "user",
-      time: item.info.time,
-      text: item.parts
+      time: { created: time.created },
+      text: parts
         .flatMap((part) => (part.type === "text" && typeof part.text === "string" ? [part.text] : []))
         .join("\n"),
+      files: parts.flatMap((part) => (part.type === "file" ? legacyFile(part) : [])),
+      agents: parts.flatMap((part) => (part.type === "agent" ? legacyAgent(part) : [])),
     }
   }
+  if (info.role !== "assistant") throw new Error("Invalid legacy message role")
+
   return {
-    id: item.info.id,
+    id: info.id,
     type: "assistant",
-    time: item.info.time,
-    agent: item.info.agent ?? "build",
-    model: { id: item.info.modelID ?? "model", providerID: item.info.providerID ?? "provider" },
-    cost: item.info.cost,
-    tokens: item.info.tokens,
-    error: item.info.error,
-    content: item.parts.flatMap<unknown>((part) => {
-      if (part.type === "text" || part.type === "reasoning") return [{ type: part.type, text: part.text ?? "" }]
-      if (part.type !== "tool") return []
-      const state = part.state as Record<string, unknown>
-      return [
-        {
-          type: "tool",
-          id: part.id,
-          name: part.tool,
-          time: state.time ?? { created: item.info.time.created },
-          state:
-            state.status === "pending"
-              ? { status: "streaming", input: state.raw ?? JSON.stringify(state.input ?? {}) }
-              : state.status === "completed"
-                ? {
-                    status: "completed",
-                    input: state.input ?? {},
-                    structured: state.metadata ?? {},
-                    content: [{ type: "text", text: state.output ?? "" }],
-                  }
-                : state.status === "error"
-                  ? {
-                      status: "error",
-                      input: state.input ?? {},
-                      structured: state.metadata ?? {},
-                      content: [],
-                      error: { type: "ToolError", message: state.error ?? "Tool failed" },
-                    }
-                  : { status: "running", input: state.input ?? {}, structured: state.metadata ?? {}, content: [] },
-        },
-      ]
-    }),
+    time,
+    agent: typeof info.agent === "string" ? info.agent : typeof info.mode === "string" ? info.mode : "build",
+    model: {
+      id: typeof info.modelID === "string" ? info.modelID : "model",
+      providerID: typeof info.providerID === "string" ? info.providerID : "provider",
+      ...(typeof info.variant === "string" ? { variant: info.variant } : {}),
+    },
+    content: parts.flatMap((part) => legacyAssistantContent(part, time.created)),
+    ...(typeof info.cost === "number" ? { cost: info.cost } : {}),
+    ...(tokens(info.tokens) ? { tokens: tokens(info.tokens) } : {}),
+    ...(structuredError(info.error) ? { error: structuredError(info.error) } : {}),
+    ...(finish(info.finish) ? { finish: finish(info.finish) } : {}),
   }
 }
 
+function isCurrentMessage(value: unknown): value is SessionMessageInfo {
+  return record(value) && typeof value.id === "string" && typeof value.type === "string" && !record(value.info)
+}
+
+function legacyFile(part: Record<string, unknown>): PromptFileAttachment[] {
+  if (typeof part.mime !== "string" || typeof part.url !== "string") return []
+  const data = part.url.match(/^data:[^,]*;base64,(.*)$/)?.[1] ?? ""
+  const source = record(part.source) ? part.source : undefined
+  const sourceText = source && record(source.text) ? source.text : undefined
+  const mention = mentionFrom(sourceText)
+  const uri = source?.type === "resource" && typeof source.uri === "string" ? source.uri : part.url
+  return [
+    {
+      data,
+      mime: part.mime,
+      source: part.url.startsWith("data:") ? { type: "inline" } : { type: "uri", uri },
+      ...(typeof part.filename === "string" ? { name: part.filename } : {}),
+      ...(mention ? { mention } : {}),
+    },
+  ]
+}
+
+function legacyAgent(part: Record<string, unknown>): PromptAgentAttachment[] {
+  if (typeof part.name !== "string") return []
+  const mention = mentionFrom(record(part.source) ? part.source : undefined)
+  return [{ name: part.name, ...(mention ? { mention } : {}) }]
+}
+
+function mentionFrom(value: Record<string, unknown> | undefined) {
+  if (
+    !value ||
+    typeof value.value !== "string" ||
+    typeof value.start !== "number" ||
+    typeof value.end !== "number"
+  )
+    return
+  return { text: value.value, start: value.start, end: value.end }
+}
+
+function legacyAssistantContent(
+  part: Record<string, unknown>,
+  created: number,
+): SessionMessageAssistant["content"] {
+  if (part.type === "text" && typeof part.text === "string")
+    return [{ type: "text", text: part.text, ...(jsonRecord(part.metadata) ? { state: jsonRecord(part.metadata) } : {}) }]
+  if (part.type === "reasoning" && typeof part.text === "string") {
+    const time = record(part.time) ? part.time : undefined
+    return [
+      {
+        type: "reasoning",
+        text: part.text,
+        ...(jsonRecord(part.metadata) ? { state: jsonRecord(part.metadata) } : {}),
+        ...(time && typeof time.start === "number"
+          ? {
+              time: {
+                created: time.start,
+                ...(typeof time.end === "number" ? { completed: time.end } : {}),
+              },
+            }
+          : {}),
+      },
+    ]
+  }
+  if (part.type !== "tool" || typeof part.id !== "string" || typeof part.tool !== "string" || !record(part.state))
+    return []
+
+  const state = part.state
+  const time = record(state.time) ? state.time : undefined
+  const toolTime = {
+    created: time && typeof time.start === "number" ? time.start : created,
+    ...(time && typeof time.start === "number" ? { ran: time.start } : {}),
+    ...(time && typeof time.end === "number" ? { completed: time.end } : {}),
+  }
+  const input = jsonRecord(state.input) ?? {}
+  const metadata = jsonRecord(state.metadata)
+  const base = {
+    type: "tool" as const,
+    id: typeof part.callID === "string" ? part.callID : part.id,
+    name: part.tool,
+    time: toolTime,
+    ...(typeof part.executed === "boolean" ? { executed: part.executed } : {}),
+    ...(jsonRecord(part.providerState) ? { providerState: jsonRecord(part.providerState) } : {}),
+    ...(jsonRecord(part.providerResultState) ? { providerResultState: jsonRecord(part.providerResultState) } : {}),
+  }
+  if (state.status === "pending")
+    return [{ ...base, state: { status: "streaming", input: typeof state.raw === "string" ? state.raw : JSON.stringify(input) } }]
+  if (state.status === "completed")
+    return [
+      {
+        ...base,
+        state: {
+          status: "completed",
+          input,
+          content: [{ type: "text", text: typeof state.output === "string" ? state.output : "" }],
+          ...(metadata ? { metadata } : {}),
+        },
+      },
+    ]
+  if (state.status === "error")
+    return [
+      {
+        ...base,
+        state: {
+          status: "error",
+          input,
+          error: structuredError(state.error) ?? { type: "ToolError", message: "Tool failed" },
+          ...(metadata ? { metadata } : {}),
+        },
+      },
+    ]
+  return [{ ...base, state: { status: "running", input, metadata: metadata ?? {} } }]
+}
+
+function structuredError(value: unknown): SessionStructuredError | undefined {
+  if (typeof value === "string") return { type: "Error", message: value }
+  if (!record(value)) return
+  if (typeof value.type === "string" && typeof value.message === "string")
+    return { type: value.type, message: value.message }
+  if (typeof value.name !== "string" || !record(value.data) || typeof value.data.message !== "string") return
+  return { type: value.name, message: value.data.message }
+}
+
+function tokens(value: unknown): SessionMessageAssistant["tokens"] | undefined {
+  if (!record(value) || !record(value.cache)) return
+  if (
+    typeof value.input !== "number" ||
+    typeof value.output !== "number" ||
+    typeof value.reasoning !== "number" ||
+    typeof value.cache.read !== "number" ||
+    typeof value.cache.write !== "number"
+  )
+    return
+  return {
+    input: value.input,
+    output: value.output,
+    reasoning: value.reasoning,
+    cache: { read: value.cache.read, write: value.cache.write },
+  }
+}
+
+function finish(value: unknown): SessionMessageAssistant["finish"] | undefined {
+  if (
+    value === "stop" ||
+    value === "length" ||
+    value === "tool-calls" ||
+    value === "content-filter" ||
+    value === "error" ||
+    value === "unknown"
+  )
+    return value
+}
+
+function jsonRecord(value: unknown): Record<string, JsonValue> | undefined {
+  if (!record(value)) return
+  return Object.fromEntries(
+    Object.entries(value).flatMap(([key, item]) => {
+      const next = jsonValue(item)
+      return next === undefined ? [] : [[key, next]]
+    }),
+  )
+}
+
+function jsonValue(value: unknown): JsonValue | undefined {
+  if (value === null || typeof value === "string" || typeof value === "boolean") return value
+  if (typeof value === "number") return Number.isFinite(value) ? value : null
+  if (Array.isArray(value)) return value.map((item) => jsonValue(item) ?? null)
+  return jsonRecord(value)
+}
+
+function record(value: unknown): value is Record<string, unknown> {
+  return !!value && typeof value === "object" && !Array.isArray(value)
+}
+
 function json(route: Route, body: unknown, headers?: Record<string, string>, status = 200) {
   return route.fulfill({
     status,

packages/cli/src/acp/event.ts

@@ -1,4 +1,4 @@
-import type { AgentSideConnection, PromptResponse, SessionUpdate } from "@agentclientprotocol/sdk"
+import type { AgentSideConnection, PromptResponse } from "@agentclientprotocol/sdk"
 import type {
   EventSubscribeOutput,
   OpenCodeClient,
@@ -37,34 +37,6 @@ export type TurnStart =
   | { readonly type: "skill"; readonly id: string }
   | { readonly type: "compaction"; readonly id: string }
 
-export const ChildSessionUpdatesCapability = "opencode/child-session-updates"
-export const ChildSessionUpdateMethod = "opencode/session/child_update"
-
-type ChildSessionUpdateBase = {
-  readonly rootSessionId: string
-  readonly childSessionId: string
-  readonly parentSessionId: string
-  readonly depth: number
-  readonly title?: string
-}
-
-export type ChildSessionUpdate = ChildSessionUpdateBase &
-  (
-    | { readonly type: "update"; readonly update: SessionUpdate }
-    | {
-        readonly type: "status"
-        readonly status: "created" | "running" | "completed" | "failed" | "interrupted"
-        readonly error?: { readonly type: string; readonly message: string }
-      }
-  )
-
-type ChildSession = {
-  readonly id: string
-  readonly parentID: string
-  readonly depth: number
-  readonly title?: string
-}
-
 function emptyToolState(): ToolState {
   return { name: "tool", input: {}, metadata: {}, content: [] }
 }
@@ -78,13 +50,8 @@ export async function streamTurn(input: {
   readonly writeTextFile: boolean
   readonly submit: (signal: AbortSignal) => Promise<unknown>
   readonly control: TurnControl
-  readonly childSessionUpdate?: (update: ChildSessionUpdate) => Promise<void>
-  readonly connectionSignal?: AbortSignal
-  readonly sessionSignal?: AbortSignal
 }): Promise<PromptResponse> {
   const streamController = new AbortController()
-  const connectionAbort = () => streamController.abort()
-  input.connectionSignal?.addEventListener("abort", connectionAbort, { once: true })
   const stream = input.client.event.subscribe({ signal: streamController.signal })[Symbol.asyncIterator]()
   const connected = await stream.next()
   if (connected.done) throw new Error("event stream disconnected before prompt admission")
@@ -95,113 +62,47 @@ export async function streamTurn(input: {
   let finish: SessionMessageAssistant["finish"]
   let executionError: { readonly type: string; readonly message: string } | undefined
   const tools = new Map<string, ToolState>()
-  const children = new Map<string, ChildSession>()
-  const openChildren = new Set<string>()
-  let standard = true
-  let handedOff = false
 
-  const notifyChild = async (
-    child: ChildSession,
-    value:
-      | { readonly type: "update"; readonly update: SessionUpdate }
-      | {
-          readonly type: "status"
-          readonly status: "created" | "running" | "completed" | "failed" | "interrupted"
-          readonly error?: { readonly type: string; readonly message: string }
-        },
-  ) => {
-    if (!input.childSessionUpdate) return
-    await input
-      .childSessionUpdate({
-        rootSessionId: input.sessionID,
-        childSessionId: child.id,
-        parentSessionId: child.parentID,
-        depth: child.depth,
-        ...(child.title ? { title: child.title } : {}),
-        ...value,
-      })
-      .catch(() => {})
-  }
+  const update = (value: Parameters<Connection["sessionUpdate"]>[0]["update"]) =>
+    input.connection.sessionUpdate({ sessionId: input.sessionID, update: value })
 
-  const updateSession = async (value: SessionUpdate, child?: ChildSession) => {
-    const projected = child ? projectChildUpdate(value, child) : value
-    if (standard && (!child || !input.childSessionUpdate)) {
-      await input.connection.sessionUpdate({ sessionId: input.sessionID, update: projected })
-    }
-    if (child) await notifyChild(child, { type: "update", update: projected })
-  }
-
-  const consume = async (mode: "turn" | "background") => {
+  const consume = async () => {
     while (!streamController.signal.aborted) {
       const next = await stream.next()
       if (next.done) throw new Error("event stream disconnected during prompt execution")
       const event = next.value
-      if (event.type === "session.created") {
-        const parentID = event.data.info.parentID
-        if (!parentID) continue
-        const parent = parentID === input.sessionID ? undefined : children.get(parentID)
-        if ((mode === "turn" && parentID === input.sessionID) || parent) {
-          const child = {
-            id: event.data.sessionID,
-            parentID,
-            depth: parent ? parent.depth + 1 : 1,
-            title: event.data.info.title,
-          }
-          children.set(child.id, child)
-          openChildren.add(child.id)
-          await notifyChild(child, { type: "status", status: "created" })
-        }
-        continue
-      }
-
-      const eventSessionID = sessionID(event)
-      const child = eventSessionID ? children.get(eventSessionID) : undefined
-      const send = (update: SessionUpdate) => updateSession(update, child)
-      if (mode === "background" && !child) continue
-
-      if (event.type === "permission.asked" && (event.data.sessionID === input.sessionID || child)) {
-        const tool = event.data.source?.callID
-          ? tools.get(toolKey(event.data.sessionID, event.data.source.callID))
-          : undefined
+      if (event.type === "permission.asked" && event.data.sessionID === input.sessionID) {
+        const tool = event.data.source?.callID ? tools.get(event.data.source.callID) : undefined
         await replyPermission({
           client: input.client,
           connection: input.connection,
           event,
-          sessionID: event.data.sessionID,
-          clientSessionID: input.sessionID,
+          sessionID: input.sessionID,
           cwd: input.cwd,
           tool,
-          ...(child ? { toolCallPrefix: child.id, titlePrefix: child.title } : {}),
         })
         continue
       }
-      if (event.type === "form.created" && (event.data.form.sessionID === input.sessionID || child)) {
+      if (event.type === "form.created" && event.data.form.sessionID === input.sessionID) {
         await input.client.form
-          .cancel({ sessionID: event.data.form.sessionID, formID: event.data.form.id })
-          .catch(() => input.client.session.interrupt({ sessionID: event.data.form.sessionID }).catch(() => {}))
+          .cancel({ sessionID: input.sessionID, formID: event.data.form.id })
+          .catch(() => input.client.session.interrupt({ sessionID: input.sessionID }).catch(() => {}))
         continue
       }
-      if (!eventSessionID || (eventSessionID !== input.sessionID && !child)) continue
+      if (!("sessionID" in event.data) || event.data.sessionID !== input.sessionID) continue
       if (matchesStart(event, input.start)) {
         started = true
         continue
       }
       if (!started) continue
 
-      if (event.type === "session.execution.started") {
-        if (child) {
-          await notifyChild(child, { type: "status", status: "running" })
-        }
-        continue
-      }
-
       if (event.type === "session.step.started") {
-        if (!child) assistantMessageID = event.data.assistantMessageID
+        assistantMessageID = event.data.assistantMessageID
         continue
       }
       if (event.type === "session.text.delta") {
-        if (!child) assistantMessageID = event.data.assistantMessageID
-        await send({
+        assistantMessageID = event.data.assistantMessageID
+        await update({
           sessionUpdate: "agent_message_chunk",
           messageId: event.data.assistantMessageID,
           content: { type: "text", text: event.data.delta },
@@ -209,8 +110,8 @@ export async function streamTurn(input: {
         continue
       }
       if (event.type === "session.reasoning.delta") {
-        if (!child) assistantMessageID = event.data.assistantMessageID
-        await send({
+        assistantMessageID = event.data.assistantMessageID
+        await update({
           sessionUpdate: "agent_thought_chunk",
           messageId: event.data.assistantMessageID,
           content: { type: "text", text: event.data.delta },
@@ -218,14 +119,9 @@ export async function streamTurn(input: {
         continue
       }
       if (event.type === "session.tool.input.started") {
-        if (!child) assistantMessageID = event.data.assistantMessageID
-        tools.set(toolKey(event.data.sessionID, event.data.callID), {
-          name: event.data.name,
-          input: {},
-          metadata: {},
-          content: [],
-        })
-        await send({
+        assistantMessageID = event.data.assistantMessageID
+        tools.set(event.data.callID, { name: event.data.name, input: {}, metadata: {}, content: [] })
+        await update({
           sessionUpdate: "tool_call",
           ...pendingToolCall({
             toolCallId: event.data.callID,
@@ -237,12 +133,11 @@ export async function streamTurn(input: {
         continue
       }
       if (event.type === "session.tool.called") {
-        if (!child) assistantMessageID = event.data.assistantMessageID
-        const key = toolKey(event.data.sessionID, event.data.callID)
-        const current = tools.get(key) ?? emptyToolState()
+        assistantMessageID = event.data.assistantMessageID
+        const current = tools.get(event.data.callID) ?? emptyToolState()
         current.input = event.data.input
-        tools.set(key, current)
-        await send({
+        tools.set(event.data.callID, current)
+        await update({
           sessionUpdate: "tool_call_update",
           ...runningToolUpdate({
             toolCallId: event.data.callID,
@@ -254,10 +149,10 @@ export async function streamTurn(input: {
         continue
       }
       if (event.type === "session.tool.progress") {
-        const current = tools.get(toolKey(event.data.sessionID, event.data.callID))
+        const current = tools.get(event.data.callID)
         if (!current) continue
         current.metadata = event.data.metadata
-        await send({
+        await update({
           sessionUpdate: "tool_call_update",
           ...runningToolUpdate({
             toolCallId: event.data.callID,
@@ -269,9 +164,8 @@ export async function streamTurn(input: {
         continue
       }
       if (event.type === "session.tool.success") {
-        const key = toolKey(event.data.sessionID, event.data.callID)
-        const current = tools.get(key) ?? emptyToolState()
-        tools.delete(key)
+        const current = tools.get(event.data.callID) ?? emptyToolState()
+        tools.delete(event.data.callID)
         await syncEditedFiles({
           connection: input.connection,
           writeTextFile: input.writeTextFile,
@@ -281,7 +175,7 @@ export async function streamTurn(input: {
           toolInput: current.input,
           metadata: event.data.metadata ?? {},
         }).catch(() => {})
-        await send({
+        await update({
           sessionUpdate: "tool_call_update",
           ...completedToolUpdate({
             toolCallId: event.data.callID,
@@ -294,10 +188,9 @@ export async function streamTurn(input: {
         continue
       }
       if (event.type === "session.tool.failed") {
-        const key = toolKey(event.data.sessionID, event.data.callID)
-        const current = tools.get(key) ?? emptyToolState()
-        tools.delete(key)
-        await send({
+        const current = tools.get(event.data.callID) ?? emptyToolState()
+        tools.delete(event.data.callID)
+        await update({
           sessionUpdate: "tool_call_update",
           ...errorToolUpdate({
             toolCallId: event.data.callID,
@@ -312,33 +205,13 @@ export async function streamTurn(input: {
         continue
       }
       if (event.type === "session.step.ended") {
-        if (!child) {
-          assistantMessageID = event.data.assistantMessageID
-          finish = event.data.finish
-        }
-        continue
-      }
-      if (event.type === "session.execution.succeeded") {
-        if (!child) return "succeeded" as const
-        openChildren.delete(child.id)
-        await notifyChild(child, { type: "status", status: "completed" })
-        if (mode === "background" && openChildren.size === 0) return "succeeded" as const
-        continue
-      }
-      if (event.type === "session.execution.interrupted") {
-        if (!child) return "interrupted" as const
-        openChildren.delete(child.id)
-        await notifyChild(child, { type: "status", status: "interrupted" })
-        if (mode === "background" && openChildren.size === 0) return "interrupted" as const
+        assistantMessageID = event.data.assistantMessageID
+        finish = event.data.finish
         continue
       }
+      if (event.type === "session.execution.succeeded") return "succeeded" as const
+      if (event.type === "session.execution.interrupted") return "interrupted" as const
       if (event.type === "session.execution.failed") {
-        if (child) {
-          openChildren.delete(child.id)
-          await notifyChild(child, { type: "status", status: "failed", error: event.data.error })
-          if (mode === "background" && openChildren.size === 0) return "failed" as const
-          continue
-        }
         executionError = event.data.error
         return "failed" as const
       }
@@ -346,13 +219,7 @@ export async function streamTurn(input: {
     return "interrupted" as const
   }
 
-  const completed = consume("turn")
-  const closeStream = async () => {
-    streamController.abort()
-    input.connectionSignal?.removeEventListener("abort", connectionAbort)
-    input.sessionSignal?.removeEventListener("abort", connectionAbort)
-    await stream.return?.(undefined).catch(() => {})
-  }
+  const completed = consume()
   try {
     await input.submit(control.admission.signal).catch((error) => {
       if (!control.cancelled) throw error
@@ -366,14 +233,6 @@ export async function streamTurn(input: {
       }
     }
     const terminal = await completed
-    if (input.childSessionUpdate && openChildren.size > 0 && !input.sessionSignal?.aborted) {
-      standard = false
-      handedOff = true
-      input.sessionSignal?.addEventListener("abort", connectionAbort, { once: true })
-      void consume("background")
-        .catch(() => {})
-        .finally(closeStream)
-    }
     const assistant = assistantMessageID
       ? await input.client.session
           .message({ sessionID: input.sessionID, messageID: assistantMessageID })
@@ -391,37 +250,11 @@ export async function streamTurn(input: {
     await completed.catch(() => {})
     throw error
   } finally {
-    if (!handedOff) await closeStream()
+    streamController.abort()
+    await stream.return?.(undefined).catch(() => {})
   }
 }
 
-function sessionID(event: EventSubscribeOutput) {
-  if ("sessionID" in event.data && typeof event.data.sessionID === "string") return event.data.sessionID
-  if (event.type === "form.created") return event.data.form.sessionID
-  return undefined
-}
-
-function toolKey(sessionID: string, callID: string) {
-  return `${sessionID}:${callID}`
-}
-
-function projectChildUpdate(update: SessionUpdate, child: ChildSession) {
-  update._meta = {
-    ...update._meta,
-    "opencode/child-session": {
-      id: child.id,
-      parentID: child.parentID,
-      depth: child.depth,
-      ...(child.title ? { title: child.title } : {}),
-    },
-  }
-  if (update.sessionUpdate === "tool_call" || update.sessionUpdate === "tool_call_update") {
-    update.toolCallId = `${child.id}:${update.toolCallId}`
-    if (update.title && child.title) update.title = `${child.title}: ${update.title}`
-  }
-  return update
-}
-
 export async function replayMessages(
   connection: Pick<AgentSideConnection, "sessionUpdate">,
   sessionID: string,

packages/cli/src/acp/permission.ts

@@ -20,30 +20,20 @@ export async function replyPermission(input: {
   readonly connection: Connection
   readonly event: PermissionEvent
   readonly sessionID: string
-  readonly clientSessionID?: string
   readonly cwd: string
   readonly tool?: Tool
-  readonly toolCallPrefix?: string
-  readonly titlePrefix?: string
 }) {
   const toolName = input.tool?.name ?? input.event.data.action
   const toolInput = { ...input.event.data.metadata, ...input.tool?.input }
   const previews = await permissionPreviews(toolName, toolInput, input.cwd)
   const result = await input.connection
     .requestPermission({
-      sessionId: input.clientSessionID ?? input.sessionID,
+      sessionId: input.sessionID,
       toolCall: {
         ...pendingToolCall({
-          toolCallId: [input.toolCallPrefix, input.event.data.source?.callID ?? input.event.data.id]
-            .filter((value) => value !== undefined)
-            .join(":"),
+          toolCallId: input.event.data.source?.callID ?? input.event.data.id,
           toolName,
-          state: {
-            input: toolInput,
-            title: [input.titlePrefix, permissionTitle(toolName, toolInput, previews)]
-              .filter((value) => value !== undefined)
-              .join(": "),
-          },
+          state: { input: toolInput, title: permissionTitle(toolName, toolInput, previews) },
           cwd: input.cwd,
         }),
         locations: permissionLocations(toolName, toolInput, input.event.data.resources, input.cwd, previews),

packages/cli/src/acp/service.ts

@@ -43,21 +43,13 @@ import { OPENCODE_VERSION } from "../version"
 import { SessionMessage } from "@opencode-ai/schema/session-message"
 import { buildConfigOptions, parseModelSelection, type ConfigOptionProvider } from "./config-option"
 import { promptContentToParts } from "./content"
-import {
-  ChildSessionUpdateMethod,
-  ChildSessionUpdatesCapability,
-  replayMessages,
-  streamTurn,
-  type ChildSessionUpdate,
-  type TurnControl,
-  type TurnStart,
-} from "./event"
+import { replayMessages, streamTurn, type TurnControl, type TurnStart } from "./event"
 import { ACPError } from "./error"
 
 export const AuthMethodID = "opencode-login"
 
 type Connection = Pick<AgentSideConnection, "sessionUpdate" | "requestPermission"> &
-  Partial<Pick<AgentSideConnection, "writeTextFile" | "extNotification" | "signal">>
+  Partial<Pick<AgentSideConnection, "writeTextFile">>
 
 type Catalog = {
   readonly providers: ConfigOptionProvider[]
@@ -72,7 +64,6 @@ type Catalog = {
 type Attached = {
   readonly id: string
   readonly cwd: string
-  readonly abort: AbortController
   catalog: Catalog
   model: ModelRef
   modeID: string
@@ -109,7 +100,7 @@ export function make(input: { readonly client: OpenCodeClient; readonly connecti
   const catalogs = new Map<string, Promise<Catalog>>()
   const registeredMcp = new Map<string, Set<string>>()
   const active = new Map<string, TurnControl>()
-  const capabilities = { writeTextFile: false, childSessionUpdates: false }
+  const capabilities = { writeTextFile: false }
 
   const catalog = (cwd: string) => {
     const cached = catalogs.get(cwd)
@@ -130,11 +121,9 @@ export function make(input: { readonly client: OpenCodeClient; readonly connecti
 
   const attach = async (session: SessionInfo, cwd: string, mcpServers: readonly McpServer[]) => {
     const currentCatalog = await catalog(cwd)
-    sessions.get(session.id)?.abort.abort()
     const state: Attached = {
       id: session.id,
       cwd,
-      abort: new AbortController(),
       catalog: currentCatalog,
       model: session.model ?? currentCatalog.defaultModel,
       modeID: session.agent ?? currentCatalog.defaultModeID,
@@ -172,7 +161,6 @@ export function make(input: { readonly client: OpenCodeClient; readonly connecti
   return {
     initialize: async (params) => {
       capabilities.writeTextFile = params.clientCapabilities?.fs?.writeTextFile === true
-      capabilities.childSessionUpdates = params.clientCapabilities?._meta?.[ChildSessionUpdatesCapability] === true
       const authMethod: AuthMethod = {
         description: "Run `opencode auth login` in the terminal",
         name: "Login with opencode",
@@ -190,7 +178,6 @@ export function make(input: { readonly client: OpenCodeClient; readonly connecti
           mcpCapabilities: { http: true, sse: false },
           promptCapabilities: { embeddedContext: true, image: true },
           sessionCapabilities: { close: {}, delete: {}, fork: {}, list: {}, resume: {} },
-          _meta: { [ChildSessionUpdatesCapability]: true },
         },
         authMethods: [authMethod],
         agentInfo: { name: "OpenCode", version: OPENCODE_VERSION },
@@ -237,7 +224,6 @@ export function make(input: { readonly client: OpenCodeClient; readonly connecti
       await input.client.session.remove({ sessionID: params.sessionId }).catch((error) => {
         if (!isSessionNotFoundError(error)) throw error
       })
-      sessions.get(params.sessionId)?.abort.abort()
       sessions.delete(params.sessionId)
       registeredMcp.delete(params.sessionId)
       return {}
@@ -248,7 +234,6 @@ export function make(input: { readonly client: OpenCodeClient; readonly connecti
       return { configOptions: configOptions(state) }
     },
     closeSession: async (params) => {
-      sessions.get(params.sessionId)?.abort.abort()
       sessions.delete(params.sessionId)
       registeredMcp.delete(params.sessionId)
       const turn = active.get(params.sessionId)
@@ -311,7 +296,6 @@ export function make(input: { readonly client: OpenCodeClient; readonly connecti
       const messageID = SessionMessage.ID.create()
       const prepared = preparePrompt(state.catalog, params.prompt, messageID)
       const control: TurnControl = { cancelled: false, admission: new AbortController() }
-      const extNotification = input.connection.extNotification
       active.set(state.id, control)
       const response = await streamTurn({
         client: input.client,
@@ -321,15 +305,7 @@ export function make(input: { readonly client: OpenCodeClient; readonly connecti
         start: prepared.start,
         writeTextFile: capabilities.writeTextFile,
         control,
-        connectionSignal: input.connection.signal,
-        sessionSignal: state.abort.signal,
         submit: (signal) => submitPrompt(input.client, state, prepared, signal),
-        ...(capabilities.childSessionUpdates && extNotification
-          ? {
-              childSessionUpdate: (update: ChildSessionUpdate) =>
-                extNotification(ChildSessionUpdateMethod, update).then(() => {}),
-            }
-          : {}),
       }).finally(() => {
         if (active.get(state.id) === control) active.delete(state.id)
       })

packages/cli/test/acp/event-behavior.test.ts

@@ -2,7 +2,7 @@ import { describe, expect, test } from "bun:test"
 import type { AgentSideConnection } from "@agentclientprotocol/sdk"
 import type { SessionMessageInfo } from "@opencode-ai/client/promise"
 import { resolve } from "node:path"
-import { replayMessages, streamTurn, type ChildSessionUpdate, type TurnControl } from "../../src/acp/event"
+import { replayMessages, streamTurn, type TurnControl } from "../../src/acp/event"
 import { createSseFixture, durableEvent, ephemeralEvent, withTimeout } from "./sse-fixture"
 
 type SessionUpdateParams = Parameters<AgentSideConnection["sessionUpdate"]>[0]
@@ -191,181 +191,6 @@ describe("acp event behavior", () => {
     }
   })
 
-  test("projects foreground child session updates onto the parent turn", async () => {
-    const updates: SessionUpdateParams[] = []
-    const fixture = createSseFixture({
-      onPrompt({ id, send }) {
-        send(durableEvent("session.input.promoted", { sessionID: "ses_parent", inputID: id }))
-        send(
-          durableEvent("session.created", {
-            sessionID: "ses_child",
-            info: childSession("ses_child", "ses_parent", "Explore code"),
-          }),
-        )
-        send(durableEvent("session.execution.started", { sessionID: "ses_child" }))
-        send(
-          durableEvent("session.tool.input.started", {
-            sessionID: "ses_child",
-            assistantMessageID: "msg_child",
-            callID: "call_read",
-            name: "read",
-          }),
-        )
-        send(
-          durableEvent("session.tool.called", {
-            sessionID: "ses_child",
-            assistantMessageID: "msg_child",
-            callID: "call_read",
-            input: { path: "/workspace/src/index.ts" },
-            executed: false,
-          }),
-        )
-        send(
-          durableEvent("session.tool.success", {
-            sessionID: "ses_child",
-            assistantMessageID: "msg_child",
-            callID: "call_read",
-            metadata: {},
-            content: [{ type: "text", text: "source" }],
-            executed: true,
-          }),
-        )
-        send(durableEvent("session.execution.succeeded", { sessionID: "ses_child" }))
-        send(durableEvent("session.execution.succeeded", { sessionID: "ses_parent" }))
-      },
-    })
-
-    try {
-      const response = await turn({
-        fixture,
-        connection: recordingConnection(updates),
-        sessionID: "ses_parent",
-        inputID: "input_parent",
-      })
-
-      expect(updates.map((item) => [item.sessionId, item.update.sessionUpdate])).toEqual([
-        ["ses_parent", "tool_call"],
-        ["ses_parent", "tool_call_update"],
-        ["ses_parent", "tool_call_update"],
-      ])
-      expect(updates.map((item) => ("toolCallId" in item.update ? item.update.toolCallId : undefined))).toEqual([
-        "ses_child:call_read",
-        "ses_child:call_read",
-        "ses_child:call_read",
-      ])
-      expect(updates[0]?.update).toMatchObject({
-        title: "Explore code: read",
-        _meta: {
-          "opencode/child-session": {
-            id: "ses_child",
-            parentID: "ses_parent",
-            depth: 1,
-            title: "Explore code",
-          },
-        },
-      })
-      expect(response.stopReason).toBe("end_turn")
-    } finally {
-      await fixture.stop()
-    }
-  })
-
-  test("continues child extension updates after the parent turn ends", async () => {
-    const updates: SessionUpdateParams[] = []
-    const childUpdates: ChildSessionUpdate[] = []
-    const completed = Promise.withResolvers<void>()
-    const fixture = createSseFixture({
-      onPrompt({ id, send }) {
-        send(durableEvent("session.input.promoted", { sessionID: "ses_parent", inputID: id }))
-        send(
-          durableEvent("session.created", {
-            sessionID: "ses_background",
-            info: childSession("ses_background", "ses_parent", "Background research"),
-          }),
-        )
-        send(durableEvent("session.execution.succeeded", { sessionID: "ses_parent" }))
-      },
-    })
-
-    try {
-      const response = await turn({
-        fixture,
-        connection: recordingConnection(updates),
-        sessionID: "ses_parent",
-        inputID: "input_parent",
-        childSessionUpdate: async (update) => {
-          childUpdates.push(update)
-          if (update.type === "status" && update.status === "completed") completed.resolve()
-        },
-      })
-      expect(response.stopReason).toBe("end_turn")
-
-      fixture.send(
-        durableEvent("session.created", {
-          sessionID: "ses_future",
-          info: childSession("ses_future", "ses_parent", "Later turn child"),
-        }),
-      )
-      fixture.send(durableEvent("session.execution.started", { sessionID: "ses_future" }))
-      fixture.send(durableEvent("session.execution.started", { sessionID: "ses_background" }))
-      fixture.send(
-        durableEvent("session.tool.input.started", {
-          sessionID: "ses_background",
-          assistantMessageID: "msg_background",
-          callID: "call_shell",
-          name: "shell",
-        }),
-      )
-      fixture.send(
-        durableEvent("session.tool.called", {
-          sessionID: "ses_background",
-          assistantMessageID: "msg_background",
-          callID: "call_shell",
-          input: { command: "pwd" },
-          executed: false,
-        }),
-      )
-      fixture.send(
-        durableEvent("session.tool.success", {
-          sessionID: "ses_background",
-          assistantMessageID: "msg_background",
-          callID: "call_shell",
-          metadata: { exit: 0 },
-          content: [{ type: "text", text: "/workspace" }],
-          executed: true,
-        }),
-      )
-      fixture.send(durableEvent("session.execution.succeeded", { sessionID: "ses_background" }))
-      await withTimeout(completed.promise, "background child completion was not delivered")
-
-      expect(updates).toEqual([])
-      expect(
-        childUpdates.map((update) =>
-          update.type === "status" ? [update.type, update.status] : [update.type, update.update.sessionUpdate],
-        ),
-      ).toEqual([
-        ["status", "created"],
-        ["status", "running"],
-        ["update", "tool_call"],
-        ["update", "tool_call_update"],
-        ["update", "tool_call_update"],
-        ["status", "completed"],
-      ])
-      expect(childUpdates[2]).toMatchObject({
-        rootSessionId: "ses_parent",
-        childSessionId: "ses_background",
-        parentSessionId: "ses_parent",
-        depth: 1,
-        title: "Background research",
-        type: "update",
-        update: { toolCallId: "ses_background:call_shell" },
-      })
-      expect(childUpdates.some((update) => update.childSessionId === "ses_future")).toBe(false)
-    } finally {
-      await fixture.stop()
-    }
-  })
-
   test("streams tool pending, progress, success, and failure updates", async () => {
     const updates: SessionUpdateParams[] = []
     const fixture = createSseFixture({
@@ -731,7 +556,6 @@ function turn(input: {
   readonly connection: Connection
   readonly sessionID: string
   readonly inputID: string
-  readonly childSessionUpdate?: (update: ChildSessionUpdate) => Promise<void>
 }) {
   return streamTurn({
     client: input.fixture.client,
@@ -741,25 +565,11 @@ function turn(input: {
     start: { type: "input", id: input.inputID },
     writeTextFile: false,
     control: { cancelled: false, admission: new AbortController() },
-    childSessionUpdate: input.childSessionUpdate,
     submit: (signal) =>
       input.fixture.client.session.prompt({ sessionID: input.sessionID, id: input.inputID, text: "hello" }, { signal }),
   })
 }
 
-function childSession(id: string, parentID: string, title: string) {
-  return {
-    id,
-    slug: id,
-    projectID: "project",
-    directory: "/workspace",
-    parentID,
-    title,
-    version: "test",
-    time: { created: 1, updated: 1 },
-  }
-}
-
 function tokens() {
   return { input: 1, output: 1, reasoning: 0, cache: { read: 0, write: 0 } }
 }

packages/cli/test/acp/permission-behavior.test.ts

@@ -153,68 +153,6 @@ describe("acp permission behavior", () => {
     }
   })
 
-  test("routes foreground child permissions through the parent ACP session", async () => {
-    const permissionRequests: RequestPermissionRequest[] = []
-    const fixture = createSseFixture({
-      onPrompt({ id, send }) {
-        send(durableEvent("session.input.promoted", { sessionID: "ses_parent", inputID: id }))
-        send(
-          durableEvent("session.created", {
-            sessionID: "ses_child",
-            info: {
-              id: "ses_child",
-              slug: "ses_child",
-              projectID: "project",
-              directory: "/workspace",
-              parentID: "ses_parent",
-              title: "Review code",
-              version: "test",
-              time: { created: 1, updated: 1 },
-            },
-          }),
-        )
-        send(durableEvent("session.execution.started", { sessionID: "ses_child" }))
-        send(
-          permissionAsked("ses_child", "perm_child", {
-            action: "read",
-            metadata: { path: "/workspace/child.ts" },
-            source: { type: "tool", messageID: "msg_child", callID: "call_child" },
-          }),
-        )
-        send(durableEvent("session.execution.succeeded", { sessionID: "ses_child" }))
-        send(durableEvent("session.execution.succeeded", { sessionID: "ses_parent" }))
-      },
-    })
-    const connection = {
-      sessionUpdate: async () => {},
-      requestPermission: async (request) => {
-        permissionRequests.push(request)
-        return { outcome: { outcome: "selected", optionId: "once" } } as const
-      },
-    } satisfies Connection
-
-    try {
-      await startTurn(fixture, connection, "ses_parent", "input_parent")
-
-      expect(permissionRequests).toHaveLength(1)
-      expect(permissionRequests[0]).toMatchObject({
-        sessionId: "ses_parent",
-        toolCall: {
-          toolCallId: "ses_child:call_child",
-          title: "Review code: /workspace/child.ts",
-        },
-      })
-      expect(fixture.requests).toContainEqual(
-        expect.objectContaining({
-          method: "POST",
-          path: "/api/session/ses_child/permission/perm_child/reply",
-        }),
-      )
-    } finally {
-      await fixture.stop()
-    }
-  })
-
   test("previews edits during approval and syncs the completed file", async () => {
     const cwd = await fs.mkdtemp(path.join(os.tmpdir(), "opencode-acp-permission-"))
     const file = path.join(cwd, "file.ts")

packages/cli/test/acp/service.test.ts

@@ -2,7 +2,6 @@ import { describe, expect, test } from "bun:test"
 import type { AgentSideConnection } from "@agentclientprotocol/sdk"
 import { OpenCode } from "@opencode-ai/client/promise"
 import { ACPService } from "../../src/acp/service"
-import { ChildSessionUpdatesCapability } from "../../src/acp/event"
 
 describe("acp service", () => {
   test("creates a v2 session, registers mcp, and publishes commands", async () => {
@@ -40,17 +39,11 @@ describe("acp service", () => {
     })
 
     try {
-      const initialized = await service.initialize({
-        protocolVersion: 1,
-        clientCapabilities: { _meta: { [ChildSessionUpdatesCapability]: true } },
-        clientInfo: { name: "test", version: "1" },
-      })
       const result = await service.newSession({
         cwd: "/workspace",
         mcpServers: [{ name: "docs", command: "bun", args: ["docs.ts"], env: [{ name: "TOKEN", value: "x" }] }],
       })
       expect(result.sessionId).toBe("ses_acp")
-      expect(initialized.agentCapabilities?._meta).toEqual({ [ChildSessionUpdatesCapability]: true })
       expect(result.configOptions?.map((option) => option.id)).toEqual(["model", "effort", "mode"])
       expect(requests).toContainEqual({
         method: "PUT",