fix(activity): name a resumed session by its own title in the agents list (#41127)

The Agents list titled a thread with the tab's generated title, the first
prompt that tab saw. After `claude --resume` in a new tab, that is the
message sent after the resume, so the list kept a status note as the
thread's name while the tab and the agent row showed the session's own
name. Rank a named provider title of the pane's own session above the
generated title, as resolveTabNameSource does, and share the session
ownership check with the agent row.

src/renderer/src/lib/workspace/activity/activity-thread-display.test.ts

@@ -0,0 +1,34 @@
+import { describe, expect, it } from 'vitest'
+import { getActivityThreadTaskTitle } from './activity-thread-display'
+
+const resumedTab = {
+  customTitle: null,
+  aiVaultTitle: {
+    agent: 'claude' as const,
+    sessionId: 'session-1',
+    title: 'Triage lead handover',
+    kind: 'named' as const
+  },
+  generatedTitle: 'Mac restarted at 15 01 so this tab stopped',
+  title: 'Triage lead handover',
+  defaultTitle: 'Terminal 2'
+}
+
+const resumedEntry = {
+  prompt: 'How is the rename going?',
+  stateHistory: [],
+  agentType: 'claude' as const,
+  providerSession: { key: 'session_id' as const, id: 'session-1' }
+}
+
+describe('getActivityThreadTaskTitle', () => {
+  it("names a resumed session by its own name, not the tab's first prompt", () => {
+    expect(
+      getActivityThreadTaskTitle({
+        entry: resumedEntry,
+        tab: resumedTab,
+        generatedTitlesEnabled: true
+      })
+    ).toBe('Triage lead handover')
+  })
+})

src/renderer/src/lib/workspace/activity/activity-thread-display.ts

@@ -4,6 +4,7 @@ import type {
   AgentStatusState
 } from '../../../../../shared/agent-status/contracts/agent-status-types'
 import type { TerminalTab } from '../../../../../shared/workspace-layout/terminal-tab-types'
+import { aiVaultTitleOfSession } from '../../../../../shared/ai-vault/contracts/ai-vault-session-title'
 import type { Worktree } from '../../../../../shared/worktree/types'
 import {
   getAgentRowPrimaryText,
@@ -83,8 +84,14 @@ export function getActivityThreadWorkspaceTitle(
 }
 
 export function getActivityThreadTaskTitle(args: {
-  entry: Pick<AgentStatusEntry, 'orchestration' | 'prompt' | 'stateHistory'>
-  tab: Pick<TerminalTab, 'customTitle' | 'generatedTitle' | 'title' | 'defaultTitle'>
+  entry: Pick<
+    AgentStatusEntry,
+    'orchestration' | 'prompt' | 'stateHistory' | 'agentType' | 'providerSession'
+  >
+  tab: Pick<
+    TerminalTab,
+    'customTitle' | 'aiVaultTitle' | 'generatedTitle' | 'title' | 'defaultTitle'
+  >
   generatedTitlesEnabled: boolean
 }): string {
   const customTitle = args.tab.customTitle?.trim()
@@ -97,6 +104,17 @@ export function getActivityThreadTaskTitle(args: {
     return orchestrationLabel
   }
 
+  // Like the tab, a session's own name outranks the first prompt this tab saw, e.g. after a resume.
+  const sessionTitle = aiVaultTitleOfSession(
+    args.tab.aiVaultTitle,
+    args.entry.agentType,
+    args.entry.providerSession?.id
+  )
+  const sessionName = sessionTitle?.kind === 'named' ? sessionTitle.title.trim() : ''
+  if (sessionName) {
+    return sessionName
+  }
+
   // Respect tabAutoGenerateTitle here too so disabled generated titles cannot resurface.
   const generatedTitle = args.generatedTitlesEnabled ? args.tab.generatedTitle?.trim() : ''
   if (generatedTitle) {

src/shared/agent-status/presentation/agent-row-conversation-name.ts

@@ -7,6 +7,7 @@ import { isJcodeIdentityTerminalTitle } from '../title/providers/jcode-terminal-
 import { SYNTHETIC_AGENT_TITLE_PROFILES } from '../title/synthetic-agent-title'
 import type { TerminalTab } from '../../workspace-layout/terminal-tab-types'
 import { resolveTabNameSource } from '../../tab-title-resolution'
+import { aiVaultTitleOfSession } from '../../ai-vault/contracts/ai-vault-session-title'
 
 export type ConversationNameTab = Pick<
   TerminalTab,
@@ -111,19 +112,12 @@ export function getAgentRowConversationName(
 ): string | null {
   const liveTitle =
     paneLiveTitle === undefined ? (tab.title?.trim() ?? '') : (paneLiveTitle?.trim() ?? '')
-  // Provider titles belong to their session, not every pane in the tab.
-  const aiVaultTitle = tab.aiVaultTitle
   const named = resolveTabNameSource(
     {
       customTitle: tab.customTitle,
       quickCommandLabel: tab.quickCommandLabel,
       liveTitle,
-      sessionTitle:
-        aiVaultTitle &&
-        aiVaultTitle.agent === agentType &&
-        aiVaultTitle.sessionId === providerSessionId
-          ? aiVaultTitle
-          : null,
+      sessionTitle: aiVaultTitleOfSession(tab.aiVaultTitle, agentType, providerSessionId),
       generatedTitle: tab.generatedTitle
     },
     generatedTitlesEnabled

src/shared/ai-vault/contracts/ai-vault-session-title.ts

@@ -11,6 +11,15 @@ export type AiVaultSessionTitle = {
   kind?: AiVaultSessionTitleKind
 }
 
+/** A tab's provider title names only the pane running that session, not every pane in the tab. */
+export function aiVaultTitleOfSession(
+  title: AiVaultSessionTitle | null | undefined,
+  agent: string | null | undefined,
+  sessionId: string | undefined
+): AiVaultSessionTitle | null {
+  return title && title.agent === agent && title.sessionId === sessionId ? title : null
+}
+
 export type AiVaultSessionTitleRequest = {
   agent: AiVaultSessionTitle['agent']
   sessionId: string