diff --git a/desktop/frontend-next/src/actions.ts b/desktop/frontend-next/src/actions.ts
index d85dcc3f14..a16eb007f7 100644
--- a/desktop/frontend-next/src/actions.ts
+++ b/desktop/frontend-next/src/actions.ts
@@ -364,6 +364,8 @@ export const ACTIONS: UIAction[] = [
   { id: "compaction.threshold", kind: "kernel-mutation", target: "none", proof: "authority-effect" },
   // Which bound is in force is the setting; how much of it is on screen is not.
   { id: "compaction.advanced", kind: "view", target: "none", proof: "interaction" },
+  { id: "compaction.confirm", kind: "view", target: "none", proof: "interaction" },
+  { id: "compaction.now", kind: "kernel-mutation", target: "none", proof: "interaction" },
   { id: "panel.move", kind: "kernel-mutation", target: "none", proof: "authority-effect" },
   { id: "panel.delegate-placement", kind: "kernel-mutation", target: "none", proof: "authority-effect" },
   { id: "context.window-tokens", kind: "kernel-mutation", target: "none", proof: "authority-effect" },
diff --git a/desktop/frontend-next/src/i18n/en.ts b/desktop/frontend-next/src/i18n/en.ts
index 8fa34846ef..a1ee844e1c 100644
--- a/desktop/frontend-next/src/i18n/en.ts
+++ b/desktop/frontend-next/src/i18n/en.ts
@@ -1098,6 +1098,10 @@ export const EN: Record<string, string> = {
   "仅显示当前模型实际支持的档位。": "Only levels actually supported by this model are shown.",
   "按模型生效": "Per model",
   "查看上下文与压缩": "View context and compaction",
+  "立即压缩": "Compact now",
+  "确认压缩": "Confirm compaction",
+  "压缩当前上下文？": "Compact the current context?",
+  "模型将依据摘要继续工作；完整对话记录会保留。": "The model will continue from a summary. The full conversation will be preserved.",
   "查看本轮费用": "View turn cost",
   "查看钱包余额": "View wallet balance",
   "余额不足": "Balance is low",
diff --git a/desktop/frontend-next/src/styles/compact-now.css b/desktop/frontend-next/src/styles/compact-now.css
new file mode 100644
index 0000000000..ff69a72b5f
--- /dev/null
+++ b/desktop/frontend-next/src/styles/compact-now.css
@@ -0,0 +1,4 @@
+.compact-now .wsconfirm { display: grid; gap: 8px; padding: 8px 0; border: 0; background: transparent; }
+.compact-now .wsconfirm-t .q { overflow: visible; white-space: normal; }
+.compact-now .wsconfirm-a { justify-content: flex-end; flex-wrap: wrap; }
+.compact-now .wsconfirm-a button:disabled { opacity: .4; cursor: default; }
diff --git a/desktop/frontend-next/src/ui/CompactNow.tsx b/desktop/frontend-next/src/ui/CompactNow.tsx
new file mode 100644
index 0000000000..b7a50bb28f
--- /dev/null
+++ b/desktop/frontend-next/src/ui/CompactNow.tsx
@@ -0,0 +1,54 @@
+import { useCallback, useMemo, useRef, useState } from "react";
+import { t } from "../i18n";
+import type { AgentPort } from "../port/port";
+import type { WireEvent } from "../port/wire";
+import { useDismiss } from "./dismiss";
+import "../styles/compact-now.css";
+
+export interface CompactAction {
+  busy: boolean;
+  pending: boolean;
+  run: () => void;
+}
+
+export function useCompactNow(port: AgentPort, blocked: boolean, onError: (error: unknown) => void) {
+  const [pending, setPending] = useState(false);
+  const held = useRef(false);
+  const release = useCallback(() => { held.current = false; setPending(false); }, []);
+  const onEvent = useCallback((event: WireEvent) => {
+    if (event.kind === "notice" && (event.code === "compacted" || event.code === "compact_declined" || event.code === "compact_failed")) release();
+  }, [release]);
+  const run = useCallback(() => {
+    if (blocked || held.current) return;
+    held.current = true;
+    setPending(true);
+    // /submit acknowledges admission; the typed notice settles the operation.
+    void port.submit("/compact").catch((error) => { release(); onError(error); });
+  }, [port, blocked, onError, release]);
+  return useMemo(() => ({ busy: blocked || pending, pending, run, onEvent, release }), [blocked, pending, run, onEvent, release]);
+}
+
+export function CompactNow({ action }: { action: CompactAction }) {
+  const [asking, setAsking] = useState(false);
+  const box = useRef<HTMLDivElement>(null);
+  const trigger = useRef<HTMLButtonElement>(null);
+  const close = useCallback(() => setAsking(false), []);
+  useDismiss(asking, box, close);
+  const cancel = () => { close(); trigger.current?.focus(); };
+  return (
+    <div className="compact-now" ref={box}>
+      <button ref={trigger} className="btn sm" data-action="compaction.confirm" disabled={action.busy} aria-expanded={asking} onClick={() => setAsking(true)}>
+        {action.pending ? t("正在压缩…") : t("立即压缩")}
+      </button>
+      {asking && (
+        <div className="wsconfirm" role="alertdialog" aria-label={t("压缩当前上下文？")}>
+          <div className="wsconfirm-t"><span className="q">{t("压缩当前上下文？")}</span><span className="h">{t("模型将依据摘要继续工作；完整对话记录会保留。")}</span></div>
+          <div className="wsconfirm-a">
+            <button autoFocus data-action="layer.dismiss" onClick={cancel}>{t("取消")}</button>
+            <button data-action="compaction.now" disabled={action.busy} onClick={() => { close(); action.run(); trigger.current?.focus(); }}>{t("确认压缩")}</button>
+          </div>
+        </div>
+      )}
+    </div>
+  );
+}
diff --git a/desktop/frontend-next/src/ui/ContextSummaryCard.tsx b/desktop/frontend-next/src/ui/ContextSummaryCard.tsx
index d366737424..c79a9ea76a 100644
--- a/desktop/frontend-next/src/ui/ContextSummaryCard.tsx
+++ b/desktop/frontend-next/src/ui/ContextSummaryCard.tsx
@@ -1,13 +1,15 @@
 import { t } from "../i18n";
 import type { ContextBreakdown, McpEntry } from "../port/port";
+import { CompactNow, type CompactAction } from "./CompactNow";
 
 const compact = (n: number): string => n >= 1_000_000 ? `${(n / 1_000_000).toFixed(1)}M` : n >= 1_000 ? `${Math.round(n / 100) / 10}k` : String(n);
 
-export function ContextSummaryCard({ context, mcp, percent, onManage, className = "" }: {
+export function ContextSummaryCard({ context, mcp, percent, onManage, compact: action, className = "" }: {
   context: ContextBreakdown | null;
   mcp: McpEntry[];
   percent: number | null;
   onManage: () => void;
+  compact?: CompactAction;
   className?: string;
 }) {
   const active = mcp.filter((entry) => entry.enabled);
@@ -31,6 +33,7 @@ export function ContextSummaryCard({ context, mcp, percent, onManage, className
           <div className="chrome-context-parts">{parts.map(([label, value, key]) => <div key={key}><i data-part={key} /><span>{label}</span><b>{compact(value)}</b></div>)}</div>
         </>
       ) : <p>{t("暂时没有上下文数据")}</p>}
+      {action && <CompactNow action={action} />}
       <section>
         <div><b>MCP</b><small>{ready.length} / {active.length} {t("个已连接")} · {tools} {t("个工具")}</small></div>
         {active.slice(0, 4).map((server) => <div className="chrome-mcp-row" key={server.name}><i data-ready={server.state === "ready" ? "" : undefined} /><span>{server.name}</span><small>{server.state === "ready" ? `${server.tools} ${t("个工具")}` : t("等待连接")}</small></div>)}
diff --git a/desktop/frontend-next/src/ui/MeterRail.tsx b/desktop/frontend-next/src/ui/MeterRail.tsx
index 820c9d4f7c..70216afb4d 100644
--- a/desktop/frontend-next/src/ui/MeterRail.tsx
+++ b/desktop/frontend-next/src/ui/MeterRail.tsx
@@ -4,6 +4,7 @@ import type { ContextBreakdown, JobEntry, McpEntry } from "../port/port";
 import type { Metrics } from "../state/session_types";
 import { DeckChips, type Deck } from "./DeckChips";
 import { ContextSummaryCard } from "./ContextSummaryCard";
+import type { CompactAction } from "./CompactNow";
 import { useDismiss } from "./dismiss";
 import type { Task } from "./panels/Agents";
 import { Spark } from "./Spark";
@@ -13,7 +14,7 @@ import { MASK, type Wallet } from "./wallet";
 import type { SpeedSummary } from "./speed";
 
 /** The numbers about this turn, in one row under the composer. */
-export function MeterRail({ tps, trail, running, speed, metrics, ctx, mcp, cost, wallet, hideAmounts, tasks, jobs, onSettings, onCancelJob }: {
+export function MeterRail({ tps, trail, running, speed, metrics, ctx, mcp, compact, cost, wallet, hideAmounts, tasks, jobs, onSettings, onCancelJob }: {
   tps: number;
   trail: number[];
   running: boolean;
@@ -21,6 +22,7 @@ export function MeterRail({ tps, trail, running, speed, metrics, ctx, mcp, cost,
   metrics: Pick<Metrics, "hit" | "miss">;
   ctx: ContextBreakdown | null;
   mcp: McpEntry[];
+  compact: CompactAction;
   cost: string;
   wallet: Wallet;
   hideAmounts: boolean;
@@ -74,6 +76,7 @@ export function MeterRail({ tps, trail, running, speed, metrics, ctx, mcp, cost,
             context={ctx}
             mcp={mcp}
             percent={contextPercent}
+            compact={compact}
             onManage={() => { closeMeter(); onSettings("ext"); }}
           />
         </div>
diff --git a/desktop/frontend-next/src/ui/Metrics.tsx b/desktop/frontend-next/src/ui/Metrics.tsx
index de548c901a..81de678e74 100644
--- a/desktop/frontend-next/src/ui/Metrics.tsx
+++ b/desktop/frontend-next/src/ui/Metrics.tsx
@@ -17,6 +17,7 @@ import type { Wallet } from "./wallet";
 import { swapping } from "./swap";
 import { ChangePreview } from "./ChangePreview";
 import type { Posture } from "./decisions";
+import type { CompactAction } from "./CompactNow";
 
 // What the rail can show. Presence is still each panel's own contract — a
 // panel with nothing to say draws nothing — so this decides where something
@@ -55,6 +56,7 @@ interface Props extends Rail {
   // Declaring the missing window rebuilds the runtime, so the rebuilt gauge
   // comes back on that same call rather than on the next poll.
   onCtx: (next: ContextBreakdown) => void;
+  compact?: CompactAction;
   yolo: boolean;
   /** The task view has the plan at full width, so the rail's copy stands down. */
   planShownElsewhere?: boolean;
@@ -93,6 +95,7 @@ export const Metrics = memo(function Metrics({
   tree,
   ctx,
   onCtx,
+  compact,
   yolo,
   planShownElsewhere,
   onSettings,
@@ -118,7 +121,7 @@ export const Metrics = memo(function Metrics({
   const panel: Record<Section, ReactNode> = {
     cache: <Cache key="cache" metrics={metrics} />,
     cost: <Cost key="cost" metrics={metrics} wallet={wallet} account={account} onRefreshWallet={onRefreshWallet} />,
-    context: <Context key="context" ctx={ctx} legend port={port} onCtx={onCtx} />,
+    context: <Context key="context" ctx={ctx} legend port={port} onCtx={onCtx} compact={compact} />,
     agents: <Agents key="agents" tasks={tasks} />,
     runtime: <Runtime key="runtime" rate={rate} done={done} stats={stats} />,
     plan: <Plan key="plan" steps={plan} shownElsewhere={planShownElsewhere} />,
diff --git a/desktop/frontend-next/src/ui/Pane.tsx b/desktop/frontend-next/src/ui/Pane.tsx
index e3f97a770f..ed8332a602 100644
--- a/desktop/frontend-next/src/ui/Pane.tsx
+++ b/desktop/frontend-next/src/ui/Pane.tsx
@@ -33,6 +33,7 @@ import { PlanFold } from "./PlanFold";
 import { RunLine } from "./RunLine";
 import type { PaneProps, PaneReport } from "./panetypes";
 import { useRate, useTrail } from "./num";
+import { useCompactNow } from "./CompactNow";
 import { DOCK, Gutter } from "./Gutter";
 import { Find } from "./Find";
 import { useFind } from "./usefind";
@@ -87,6 +88,10 @@ function PaneView({ port, rt, title, active, visible, sideHost, side, onFocus, o
   const workbench = docked || tab === "browser";
   const flow = useRef<HTMLDivElement>(null);
   const running = s.running || !!status?.running; // A paired device can join after turn_started.
+  const fail = useCallback((e: unknown) => {
+    dispatch({ kind: "__error", text: reason(e) } as never);
+  }, []);
+  const compact = useCompactNow(port, running || s.items.some((item) => item.t === "compaction" && !item.done), fail);
   // Elapsed is a clock reading and belongs on the tick. Throughput is not: it
   // follows the deltas themselves, and expires rather than being re-derived.
   const tps = useRate(s.outWindow, running);
@@ -144,6 +149,7 @@ function PaneView({ port, rt, title, active, visible, sideHost, side, onFocus, o
     () =>
       port.subscribe(
         (ev) => {
+          compact.onEvent(ev);
           pacer.push(ev); if (ev.kind === "turn_done") onTurnDone?.(rt.id);
           // A server finishing its handshake changes what /mcp answers, and this
           // is the only precise signal for it — the turn boundary below is the
@@ -162,12 +168,13 @@ function PaneView({ port, rt, title, active, visible, sideHost, side, onFocus, o
           if (ev.kind === "notice" && ev.code === "display_currency") revalue();
         },
         () => {
+          compact.release();
           pacer.drop();
           rebuild();
           refreshStatus();
         },
       ),
-    [port, pacer, rt.id, onTurnDone, reloadMcp, rebuild, refreshStatus, revalue],
+    [port, pacer, rt.id, onTurnDone, reloadMcp, rebuild, refreshStatus, revalue, compact.onEvent, compact.release],
   );
 
   // What the rows cover is dispatched before the rows themselves, so the table
@@ -214,12 +221,6 @@ function PaneView({ port, rt, title, active, visible, sideHost, side, onFocus, o
     if (pulse) refreshStatus();
   }, [pulse, refreshStatus]);
 
-  const fail = useCallback((e: unknown) => {
-    // A refusal carries a code; say() turns it into this window's language.
-    // Anything else is an ordinary failure and prints as itself.
-    dispatch({ kind: "__error", text: reason(e) } as never);
-  }, []);
-
   // Everything on screen belongs to one session; when the kernel moves this
   // pane to another one — a switch, a new session, a rewind — all of it has to
   // be re-read rather than patched.
@@ -505,7 +506,7 @@ function PaneView({ port, rt, title, active, visible, sideHost, side, onFocus, o
         {alert && <div className="cmpalert">{alert}</div>}
         <Composer port={port} status={status} running={running} quote={quote} restore={restored} focus={askFocus} onSubmit={submit} onChanged={refreshStatus} onError={fail} onSettings={onSettings} changeCount={tree?.repo ? tree.changes.length : 0} pulse={pulse} draftKey={draftKey(rt.host ?? "", rt.root, rt.sessionPath || status?.sessionPath || "")} />
         <MeterRail
-          tps={tps} trail={trail} running={running} speed={speed} metrics={s.metrics} ctx={ctx} mcp={mcp} cost={cost}
+          tps={tps} trail={trail} running={running} speed={speed} metrics={s.metrics} ctx={ctx} mcp={mcp} compact={compact} cost={cost}
           wallet={wallet} hideAmounts={hideAmounts} tasks={rail.tasks} jobs={jobs} onSettings={onSettings}
           onCancelJob={(id) => port.cancelJob(id).then(refreshStatus, fail)}
         />
@@ -545,6 +546,7 @@ function PaneView({ port, rt, title, active, visible, sideHost, side, onFocus, o
             tree={tree}
             ctx={ctx}
             onCtx={setCtx}
+            compact={compact}
             yolo={status?.toolApprovalMode === "yolo"}
             onSettings={onSettings}
             panels={s.panels}
diff --git a/desktop/frontend-next/src/ui/context-compact.interaction.test.tsx b/desktop/frontend-next/src/ui/context-compact.interaction.test.tsx
new file mode 100644
index 0000000000..4a397da68e
--- /dev/null
+++ b/desktop/frontend-next/src/ui/context-compact.interaction.test.tsx
@@ -0,0 +1,170 @@
+// @vitest-environment jsdom
+import "./testkit";
+import { act, cleanup, fireEvent, render, screen, waitFor, within } from "@testing-library/react";
+import { afterEach, expect, it, vi } from "vitest";
+import { MockPort } from "../port/mock";
+import type { WireEvent } from "../port/wire";
+import { Pane } from "./Pane";
+
+afterEach(() => { cleanup(); localStorage.clear(); vi.restoreAllMocks(); });
+
+async function mount(running = false, side = false) {
+  const port = new MockPort();
+  const snapshot = await port.status();
+  let kernelRunning = running;
+  vi.spyOn(port, "status").mockImplementation(async () => ({ ...snapshot, running: kernelRunning }));
+  const subscribers = new Set<(event: WireEvent) => void>();
+  let gap: (() => void) | undefined;
+  vi.spyOn(port, "subscribe").mockImplementation((onEvent, onGap) => {
+    subscribers.add(onEvent);
+    gap = onGap;
+    return () => subscribers.delete(onEvent);
+  });
+  const submit = vi.spyOn(port, "submit").mockResolvedValue();
+  const queue = vi.spyOn(port, "queueFollowup");
+  const context = vi.spyOn(port, "context");
+  const settings = vi.fn();
+  const host = document.createElement("aside");
+  const view = render(<>
+    <Pane port={port} rt={{ id: "compact", root: "/workspace", name: "Workspace", base: "/rt/compact" }}
+      title="Workspace" active visible sideHost={side ? host : null} side={side}
+      onFocus={() => {}} onReport={() => {}} onSessionChanged={() => {}} pulse={0} findPulse={0}
+      onSettings={settings} needsProject={false} onOpenProject={() => {}} onKeepHere={() => {}}
+      theme="light" dockW={320} dockMax={640} onDockW={() => {}} />
+  </>);
+  view.container.append(host);
+  await screen.findByRole("button", { name: "查看上下文与压缩" });
+  fireEvent.click(screen.getByRole("button", { name: "查看上下文与压缩" }));
+  await waitFor(() => expect(view.container.querySelector('.studio-context-anchor[data-open]')).toBeTruthy());
+  const send = (event: WireEvent) => act(() => { subscribers.forEach((fn) => fn(event)); });
+  const card = () => within(screen.getByRole("dialog", { name: "上下文详情" }));
+  return { port, submit, queue, context, settings, send, card, host, gap: () => act(() => gap?.()), setRunning: (value: boolean) => { kernelRunning = value; } };
+}
+
+const draft = () => document.querySelector<HTMLTextAreaElement>('textarea[aria-label="任务输入"]')!;
+
+async function confirm(card: ReturnType<typeof within>) {
+  fireEvent.click(card.getByRole("button", { name: "立即压缩" }));
+  fireEvent.click(card.getByRole("button", { name: "确认压缩" }));
+}
+
+it("asks before compacting from the ring, preserving the draft and avoiding a fake user turn", async () => {
+  const pane = await mount();
+  fireEvent.change(draft(), { target: { value: "Keep my unsent prompt" } });
+  fireEvent.click(pane.card().getByRole("button", { name: "立即压缩" }));
+  expect(pane.card().getByRole("alertdialog")).toBeTruthy();
+  expect(pane.submit).not.toHaveBeenCalled();
+  fireEvent.click(pane.card().getByRole("button", { name: "确认压缩" }));
+  await waitFor(() => expect(pane.submit).toHaveBeenCalledExactlyOnceWith("/compact"));
+  expect(draft().value).toBe("Keep my unsent prompt");
+  expect(screen.queryByText("/compact")).toBeNull();
+  expect(pane.queue).not.toHaveBeenCalled();
+});
+
+it.each(["cancel", "escape", "outside"])("dismisses confirmation with %s without submitting", async (way) => {
+  const pane = await mount();
+  fireEvent.click(pane.card().getByRole("button", { name: "立即压缩" }));
+  if (way === "cancel") fireEvent.click(pane.card().getByRole("button", { name: "取消" }));
+  else if (way === "escape") fireEvent.keyDown(pane.card().getByRole("alertdialog"), { key: "Escape" });
+  else fireEvent.mouseDown(draft());
+  expect(pane.card().queryByRole("alertdialog")).toBeNull();
+  expect(pane.submit).not.toHaveBeenCalled();
+});
+
+it.each(["compacted", "compact_declined", "compact_failed"])("keeps both entry points disabled until the %s receipt", async (code) => {
+  const pane = await mount(false, true);
+  const rail = within(pane.host);
+  await confirm(pane.card());
+  await waitFor(() => expect(pane.submit).toHaveBeenCalledTimes(1));
+  expect(pane.card().getByRole<HTMLButtonElement>("button", { name: "正在压缩…" }).disabled).toBe(true);
+  expect(rail.getByRole<HTMLButtonElement>("button", { name: "正在压缩…" }).disabled).toBe(true);
+  pane.send({ kind: "notice", code: "runtime_reloaded", text: "compacted" });
+  expect(rail.getByRole<HTMLButtonElement>("button", { name: "正在压缩…" }).disabled).toBe(true);
+  pane.send({ kind: "notice", code, text: "kernel feedback", detail: "input_unchanged" });
+  await waitFor(() => expect(rail.getByRole<HTMLButtonElement>("button", { name: "立即压缩" }).disabled).toBe(false));
+  expect(pane.card().getByRole<HTMLButtonElement>("button", { name: "立即压缩" }).disabled).toBe(false);
+  await screen.findByText(code === "compacted" ? "已压缩" : code === "compact_declined" ? "无需压缩：上下文自上次整理后没有变化" : "压缩失败：上下文自上次整理后没有变化");
+});
+
+it("compacts from the context panel through the same controller path", async () => {
+  const pane = await mount(false, true);
+  await confirm(within(pane.host));
+  await waitFor(() => expect(pane.submit).toHaveBeenCalledExactlyOnceWith("/compact"));
+  expect(pane.card().getByRole<HTMLButtonElement>("button", { name: "正在压缩…" }).disabled).toBe(true);
+});
+
+it("disables manual compaction on a paired running session and on streamed compaction", async () => {
+  const pane = await mount(true);
+  expect(pane.card().getByRole<HTMLButtonElement>("button", { name: "立即压缩" }).disabled).toBe(true);
+  pane.setRunning(false);
+  pane.send({ kind: "turn_done" });
+  await waitFor(() => expect(pane.card().getByRole<HTMLButtonElement>("button", { name: "立即压缩" }).disabled).toBe(false));
+  pane.send({ kind: "compaction_started", compaction: { trigger: "manual" } });
+  await waitFor(() => expect(pane.card().getByRole<HTMLButtonElement>("button", { name: "立即压缩" }).disabled).toBe(true));
+  const before = pane.context.mock.calls.length;
+  pane.send({ kind: "compaction_done", compaction: { trigger: "manual" } });
+  await waitFor(() => expect(pane.card().getByRole<HTMLButtonElement>("button", { name: "立即压缩" }).disabled).toBe(false));
+  await waitFor(() => expect(pane.context.mock.calls.length).toBeGreaterThan(before));
+  expect(pane.submit).not.toHaveBeenCalled();
+});
+
+it("refuses a confirmation whose turn started while it was open", async () => {
+  const pane = await mount();
+  fireEvent.click(pane.card().getByRole("button", { name: "立即压缩" }));
+  pane.setRunning(true);
+  pane.send({ kind: "turn_started" });
+  await waitFor(() => expect(pane.card().getByRole<HTMLButtonElement>("button", { name: "确认压缩" }).disabled).toBe(true));
+  fireEvent.click(pane.card().getByRole("button", { name: "确认压缩" }));
+  expect(pane.submit).not.toHaveBeenCalled();
+});
+
+it("reports a transport refusal and restores the action for retry without queueing", async () => {
+  const pane = await mount();
+  pane.submit.mockRejectedValueOnce(new Error("transport refused"));
+  await confirm(pane.card());
+  await screen.findByText("transport refused");
+  expect(pane.card().getByRole<HTMLButtonElement>("button", { name: "立即压缩" }).disabled).toBe(false);
+  expect(pane.queue).not.toHaveBeenCalled();
+  await confirm(pane.card());
+  await waitFor(() => expect(pane.submit).toHaveBeenCalledTimes(2));
+});
+
+it("keeps the adjacent MCP management action working", async () => {
+  const pane = await mount();
+  fireEvent.click(pane.card().getByRole("button", { name: "管理 MCP 与工具" }));
+  expect(pane.settings).toHaveBeenCalledExactlyOnceWith("ext");
+});
+
+it("holds both controls during HTTP admission and refuses a second confirmation", async () => {
+  const pane = await mount(false, true);
+  let admitted: (() => void) | undefined;
+  pane.submit.mockImplementationOnce(() => new Promise<void>((resolve) => { admitted = resolve; }));
+  fireEvent.click(pane.card().getByRole("button", { name: "立即压缩" }));
+  fireEvent.click(within(pane.host).getByRole("button", { name: "立即压缩" }));
+  fireEvent.click(within(pane.host).getByRole("button", { name: "确认压缩" }));
+  expect(pane.submit).toHaveBeenCalledTimes(1);
+  fireEvent.click(pane.card().getByRole("button", { name: "确认压缩" }));
+  expect(pane.submit).toHaveBeenCalledTimes(1);
+  await act(async () => admitted?.());
+  expect(within(pane.host).getByRole<HTMLButtonElement>("button", { name: "正在压缩…" }).disabled).toBe(true);
+  pane.send({ kind: "notice", code: "compacted", text: "compacted" });
+  await waitFor(() => expect(within(pane.host).getByRole<HTMLButtonElement>("button", { name: "立即压缩" }).disabled).toBe(false));
+});
+
+it("does not rearm when a fast result arrives before HTTP admission resolves", async () => {
+  const pane = await mount();
+  let admitted: (() => void) | undefined;
+  pane.submit.mockImplementationOnce(() => new Promise<void>((resolve) => { admitted = resolve; }));
+  await confirm(pane.card());
+  pane.send({ kind: "notice", code: "compact_declined", text: "nothing to compact", detail: "input_unchanged" });
+  await act(async () => admitted?.());
+  expect(pane.card().getByRole<HTMLButtonElement>("button", { name: "立即压缩" }).disabled).toBe(false);
+});
+
+it("releases a request whose result was lost across a stream gap", async () => {
+  const pane = await mount();
+  await confirm(pane.card());
+  await waitFor(() => expect(pane.submit).toHaveBeenCalledTimes(1));
+  pane.gap();
+  await waitFor(() => expect(pane.card().getByRole<HTMLButtonElement>("button", { name: "立即压缩" }).disabled).toBe(false));
+});
diff --git a/desktop/frontend-next/src/ui/panels/Context.tsx b/desktop/frontend-next/src/ui/panels/Context.tsx
index 7f4d71dc50..57b09849cf 100644
--- a/desktop/frontend-next/src/ui/panels/Context.tsx
+++ b/desktop/frontend-next/src/ui/panels/Context.tsx
@@ -6,6 +6,7 @@ import { pct as percent, tokens } from "../../i18n/format";
 import { pinToViewport } from "../place";
 import { useFoldBound } from "./useFoldBound";
 import { Row } from "./kit";
+import { CompactNow, type CompactAction } from "../CompactNow";
 
 // The order is the order they arrive in a prompt, so the bar reads the way the
 // request is built rather than by size — a class that grows is easier to spot
@@ -62,7 +63,7 @@ function place(anchor: RefObject<HTMLElement | null>) {
  *  all. Each names its own denominator, so neither becomes a percentage of
  *  something unstated, and the window stays the number a relay gets wrong and
  *  the only place it can be corrected. */
-export function Context({ ctx, legend = false, port, onCtx }: {
+export function Context({ ctx, legend = false, port, onCtx, compact }: {
   ctx: ContextBreakdown | null;
   legend?: boolean;
   // Both are needed to offer the missing window: one to declare it, one to
@@ -70,6 +71,7 @@ export function Context({ ctx, legend = false, port, onCtx }: {
   // cannot draw, which is the half that was there before.
   port?: AgentPort;
   onCtx?: (next: ContextBreakdown) => void;
+  compact?: CompactAction;
 }) {
   // Every hook runs before the first return: ctx arrives one render after the
   // rail mounts, and a guard above them made that render ask for hooks the
@@ -124,6 +126,7 @@ export function Context({ ctx, legend = false, port, onCtx }: {
           {t("该来源未声明窗口大小，因此无法显示已用比例，也不会自动压缩。中转服务转发的是第三方模型，其容量只有你知道。")}
         </p>
         {field}
+        {compact && <CompactNow action={compact} />}
       </>
     );
     return legend ? <div className="block" data-b="ctx">{missing}</div> : missing;
@@ -175,6 +178,7 @@ export function Context({ ctx, legend = false, port, onCtx }: {
           any more — so both keep a row, and each names its own denominator
           rather than collapsing into one percentage of something unstated. */}
       <Row k={t("上下文")} v={<span className="ctxq">{tokens(Math.round(used))}</span>} />
+      {compact && <CompactNow action={compact} />}
       {!folds && <Row k={t("模型容量")} v={windowFigure} />}
       {!folds && editing && field}
       <div