From 571c3c4f008f0c135b66b5790dc51f04f62bc0cc Mon Sep 17 00:00:00 2001
From: usrnk1 <7547651+usrnk1@users.noreply.github.com>
Date: Thu, 10 Sep 2026 00:09:10 +0200
Subject: [PATCH] feat(desktop): show compaction progress and outcomes (#48152)

---
 .../session-timeline-notices.spec.ts          | 72 +++++++++++++++++--
 .../src/message/message-content.tsx           | 43 +++++++----
 packages/ui/src/i18n/en.ts                    |  5 ++
 3 files changed, 101 insertions(+), 19 deletions(-)

diff --git a/packages/app/e2e/regression/session-timeline-notices.spec.ts b/packages/app/e2e/regression/session-timeline-notices.spec.ts
index f66cd2c3088..0c89d3fe633 100644
--- a/packages/app/e2e/regression/session-timeline-notices.spec.ts
+++ b/packages/app/e2e/regression/session-timeline-notices.spec.ts
@@ -7,7 +7,6 @@ import {
   compactionFailed,
   compactionStarted,
   directory,
-  event,
   session,
   sessionID,
   setupTimeline,
@@ -87,12 +86,13 @@ test("renders current protocol notices in CLI order", async ({ page }) => {
   expect(ownerWarnings).toEqual([])
 })
 
-test("renders a compaction summary while it streams and after completion", async ({ page }) => {
+test("renders compaction progress, summary, and outcome in order", async ({ page }) => {
   const timeline = await setupTimeline(page, {
     settings: {
       timelineDetail: { ...timelinePresets[2].value, notices: { placement: "separate" } },
     },
     sessionMessages: [user, assistant(true)],
+    sessionStatus: { [sessionID]: { type: "busy" } },
   })
 
   await timeline.send(
@@ -104,7 +104,15 @@ test("renders a compaction summary while it streams and after completion", async
   )
 
   const compaction = page.locator('[data-component="session-compaction-message"]')
-  await expect(compaction.getByText("Session compacted", { exact: true })).toBeVisible()
+  await expect(compaction.getByText("Session compaction started", { exact: true })).toBeVisible()
+  await expect(compaction.getByRole("status").getByLabel("Compacting", { exact: true })).toBeVisible()
+  await expect(compaction.locator('[data-component="text-shimmer"]')).toHaveAttribute("data-active", "true")
+  await expect(compaction.getByText("Session compacted", { exact: true })).toHaveCount(0)
+  await expect(page.getByRole("button", { name: "Stop", exact: true })).toBeVisible()
+  await expect(page.locator('[data-component="session-working"]')).toHaveCount(0)
+
+  await page.setViewportSize({ width: 480, height: 900 })
+  await expect(compaction.getByText("Session compaction started", { exact: true })).toBeInViewport()
 
   await timeline.send(
     compactionDelta({
@@ -114,6 +122,8 @@ test("renders a compaction summary while it streams and after completion", async
   )
   await expect(compaction.getByRole("heading", { name: "Checkpoint" })).toBeVisible()
   await expect(compaction).toContainText("Streamed implementation details.")
+  await expect(compaction.getByRole("status").getByLabel("Compacting", { exact: true })).toBeVisible()
+  await expect(compaction.getByText("Session compacted", { exact: true })).toHaveCount(0)
 
   await timeline.send(
     compactionEnded({
@@ -125,6 +135,18 @@ test("renders a compaction summary while it streams and after completion", async
   )
   await expect(compaction).toContainText("Final implementation details.")
   await expect(compaction).not.toContainText("Streamed implementation details.")
+  await expect(compaction.getByText("Session compaction started", { exact: true })).toBeVisible()
+  await expect(compaction.getByText("Session compacted", { exact: true })).toBeVisible()
+  await expect
+    .poll(async () => {
+      const summary = await compaction.locator('[data-component="text-part"]').boundingBox()
+      const completed = await compaction.getByText("Session compacted", { exact: true }).boundingBox()
+      return !!summary && !!completed && completed.y >= summary.y + summary.height
+    })
+    .toBe(true)
+  await expect(compaction.getByRole("status")).toHaveCount(0)
+  await expect(page.getByRole("button", { name: "Stop", exact: true })).toBeVisible()
+  await expect(page.locator('[data-component="session-working"]')).toBeVisible()
 })
 
 test("updates running compactions to failed and cancelled boundaries", async ({ page }) => {
@@ -146,7 +168,10 @@ test("updates running compactions to failed and cancelled boundaries", async ({
 
   const compactions = page.locator('[data-component="session-compaction-message"]')
   const failed = compactions.filter({ hasText: "The provider rejected the summary." })
-  await expect(failed.getByText("Session compacted", { exact: true })).toBeVisible()
+  await expect(failed.getByText("Session compaction started", { exact: true })).toBeVisible()
+  await expect(failed.getByText("Session compaction failed", { exact: true })).toBeVisible()
+  await expect(failed.getByText("Session compacted", { exact: true })).toHaveCount(0)
+  await expect(failed.getByRole("status")).toHaveCount(0)
   await expect(failed.getByText("ProviderError: The provider rejected the summary.", { exact: true })).toBeVisible()
   await expect(failed).not.toContainText("Partial summary that should be discarded.")
 
@@ -164,11 +189,48 @@ test("updates running compactions to failed and cancelled boundaries", async ({
 
   await expect(compactions).toHaveCount(2)
   const cancelled = compactions.filter({ hasNotText: "The provider rejected the summary." })
-  await expect(cancelled.getByText("Session compacted", { exact: true })).toBeVisible()
+  await expect(cancelled.getByText("Session compaction started", { exact: true })).toBeVisible()
+  await expect(cancelled.getByText("Session compaction cancelled", { exact: true })).toBeVisible()
+  await expect(cancelled.getByText("Session compacted", { exact: true })).toHaveCount(0)
+  await expect(cancelled.getByRole("status")).toHaveCount(0)
   await expect(cancelled).not.toContainText("Cancellation detail should stay hidden.")
   await expect(cancelled).not.toContainText("Summary before cancellation.")
 })
 
+test("shows an interrupted outcome when stopping automatic compaction", async ({ page }) => {
+  const timeline = await setupTimeline(page, {
+    sessionMessages: [user, assistant(true)],
+    sessionStatus: { [sessionID]: { type: "busy" } },
+  })
+  await timeline.send(compactionStarted({ sessionID, reason: "auto", recent: "" }))
+  await timeline.send(compactionDelta({ sessionID, text: "Partial automatic summary." }))
+  const compaction = page.locator('[data-component="session-compaction-message"]')
+  await expect(compaction.getByRole("status").getByLabel("Compacting", { exact: true })).toBeVisible()
+  await expect(compaction).toContainText("Partial automatic summary.")
+
+  const request = page.waitForRequest(
+    (request) =>
+      request.method() === "POST" && new URL(request.url()).pathname === `/api/session/${sessionID}/interrupt`,
+  )
+  await page.getByRole("button", { name: "Stop", exact: true }).click()
+  await request
+  await timeline.send(
+    compactionFailed({
+      sessionID,
+      reason: "auto",
+      error: { type: "compaction.interrupted", message: "Compaction was interrupted" },
+    }),
+  )
+
+  await expect(compaction.getByText("Session compaction started", { exact: true })).toBeVisible()
+  await expect(compaction.getByText("Session compaction interrupted", { exact: true })).toBeVisible()
+  await expect(compaction.getByText("Session compaction failed", { exact: true })).toHaveCount(0)
+  await expect(compaction.getByText("Session compacted", { exact: true })).toHaveCount(0)
+  await expect(compaction.getByRole("status")).toHaveCount(0)
+  await expect(compaction).not.toContainText("Partial automatic summary.")
+  await expect(compaction).not.toContainText("Compaction was interrupted")
+})
+
 test("moves blocking work to the background with Ctrl+B", async ({ page }) => {
   await setupTimeline(page, {
     settings: {
diff --git a/packages/session-ui/src/message/message-content.tsx b/packages/session-ui/src/message/message-content.tsx
index 297248e07e3..c4853a31b7d 100644
--- a/packages/session-ui/src/message/message-content.tsx
+++ b/packages/session-ui/src/message/message-content.tsx
@@ -392,7 +392,8 @@ export function SessionCompactionMessage(props: { message: SessionMessageCompact
   const i18n = useI18n()
   const summary = () => (props.message.status === "failed" ? "" : props.message.summary)
   const error = () => {
-    if (props.message.status !== "failed" || props.message.error.type === "aborted") return ""
+    if (props.message.status !== "failed") return ""
+    if (props.message.error.type === "aborted" || props.message.error.type === "compaction.interrupted") return ""
     return props.error
   }
   const compact = createMemo(
@@ -410,24 +411,33 @@ export function SessionCompactionMessage(props: { message: SessionMessageCompact
       output: compact().format(output),
     })
   }
-  const label = createMemo(() =>
-    [
-      i18n.t(
-        props.message.status === "completed" && props.message.providerContext
-          ? "ui.messagePart.providerCompaction"
-          : "ui.messagePart.compaction",
-      ),
-      usage(),
-    ]
-      .filter(Boolean)
-      .join(" · "),
-  )
+  const outcome = () => {
+    if (props.message.status !== "failed")
+      return props.message.status === "completed" && props.message.providerContext
+        ? "ui.messagePart.providerCompaction"
+        : "ui.messagePart.compaction"
+    if (props.message.error.type === "aborted") return "ui.messagePart.compaction.cancelled"
+    if (props.message.error.type === "compaction.interrupted") return "ui.messagePart.compaction.interrupted"
+    return "ui.messagePart.compaction.failed"
+  }
+  const label = createMemo(() => [i18n.t(outcome()), usage()].filter(Boolean).join(" · "))
 
   return (
     <div data-component="session-compaction-message">
       <div class="py-2">
-        <TimelineSeparator label={label()} />
+        <TimelineSeparator label={i18n.t("ui.messagePart.compaction.started")} />
       </div>
+      <Show when={props.message.status === "running"}>
+        <div role="status" class="py-2">
+          <BasicTool
+            icon="archive"
+            trigger={{ title: i18n.t("ui.messagePart.compaction.running") }}
+            status="running"
+            locked
+            hideDetails
+          />
+        </div>
+      </Show>
       <Show when={summary().trim()}>
         <div data-component="text-part" data-timeline-part-id={props.message.id}>
           <div data-slot="text-part-body">
@@ -439,6 +449,11 @@ export function SessionCompactionMessage(props: { message: SessionMessageCompact
           </div>
         </div>
       </Show>
+      <Show when={props.message.status !== "running"}>
+        <div class="py-2">
+          <TimelineSeparator label={label()} />
+        </div>
+      </Show>
       <Show when={error()}>
         <Card variant="error" class="error-card">
           {error()}
diff --git a/packages/ui/src/i18n/en.ts b/packages/ui/src/i18n/en.ts
index 6adc4960464..8efa5c44921 100644
--- a/packages/ui/src/i18n/en.ts
+++ b/packages/ui/src/i18n/en.ts
@@ -104,6 +104,11 @@ const source = {
   "ui.messagePart.review.title": "Review your answers",
   "ui.messagePart.questions.dismissed": "Questions dismissed",
   "ui.messagePart.compaction": "Session compacted",
+  "ui.messagePart.compaction.started": "Session compaction started",
+  "ui.messagePart.compaction.running": "Compacting",
+  "ui.messagePart.compaction.failed": "Session compaction failed",
+  "ui.messagePart.compaction.cancelled": "Session compaction cancelled",
+  "ui.messagePart.compaction.interrupted": "Session compaction interrupted",
   "ui.messagePart.providerCompaction": "Session compacted by provider",
   "ui.messagePart.compaction.usage": "{{input}} in · {{output}} out",
   "ui.messagePart.context.details": "Details",