diff --git a/src/main/agent-hooks/server/server-status-application.ts b/src/main/agent-hooks/server/server-status-application.ts
index ae632a0ec85..86ae6cd96cc 100644
--- a/src/main/agent-hooks/server/server-status-application.ts
+++ b/src/main/agent-hooks/server/server-status-application.ts
@@ -12,7 +12,7 @@ import type {
   AgentStatusObservationOrigin
 } from '../../../shared/agent-status-observation'
 import { AGENT_STATUS_2A_CURRENT_PRODUCER_MODE } from '../../../shared/agent-status-legacy-adapter'
-import type { AgentStatusState, ParsedAgentStatusPayload } from '../../../shared/agent-status-types'
+import { mainAgentState } from '../../../shared/main-agent-status'
 import { admitLegacyAgentStatus } from '../../../shared/agent-hook-listener/listener-state'
 import type { EnrichedAgentHookEventPayload } from './server-types'
 import { agentTypeToPromptSentAgentKind } from './server-status-identity'
@@ -21,10 +21,6 @@ import { AgentHookServerStatusDisposition } from './server-status-disposition'
 // Evicting remembered evidence makes later replay fall back to its arrival time.
 const MAX_REMEMBERED_EVIDENCE_OBSERVATIONS = 1024
 
-function mainAgentState(payload: ParsedAgentStatusPayload): AgentStatusState {
-  return payload.mainAgent?.state ?? payload.state
-}
-
 /** Only live main-agent turn boundaries establish a start; replay and child events preserve it. */
 function resolveTurnStartedAt(
   previous: EnrichedAgentHookEventPayload | undefined,
diff --git a/src/main/external-conversations/external-conversation-events.ts b/src/main/external-conversations/external-conversation-events.ts
index 8348691d8fa..78b070910ed 100644
--- a/src/main/external-conversations/external-conversation-events.ts
+++ b/src/main/external-conversations/external-conversation-events.ts
@@ -20,6 +20,7 @@ import {
 } from './external-conversation-links'
 import type { AgentPromptExpectedBinding } from '../runtime/runtime-terminal-contracts'
 import { sameBinding } from './external-conversation-send'
+import { workingStampedTurn } from './external-conversation-turn-id'
 import type { ConversationKey } from './external-conversation-types'
 
 type ConversationPane = { conversation: ConversationKey; worktreeId: string; paneKey: string }
@@ -76,7 +77,10 @@ export const HOST_CLOCK: Pick<ConversationEventsDeps, 'setTimer' | 'now'> = {
 /** Watch-scoped turn news shares mobile push detection and automation completion verdicts. */
 export class ConversationEvents {
   private readonly listeners = new Set<ConversationWatchListener>()
-  private readonly turnStartedAt = new Map<string, number>()
+  // A started turn's id only where the host stamps none; the host's stamp is the id everywhere else.
+  private readonly unstampedTurn = new Map<string, number>()
+  // The stamped turn last announced per pane, only so a start is told once; never read as an id.
+  private readonly announcedTurn = new Map<string, number>()
   // Prompts our cancel rejected, by pane: Claude's hooks report no end for that turn.
   private readonly rejected = new Map<
     string,
@@ -99,6 +103,11 @@ export class ConversationEvents {
       const unsubscribe = this.deps.onAgentPaneChange((change) => {
         this.settleRejected(change.paneKey)
         news.observe(change)
+        // A working row's stamp is told once, whether or not news reported its start.
+        const stamp = workingStampedTurn(this.deps.readHookRow(change.paneKey))
+        if (stamp !== null && change.workspace) {
+          this.announceStamp(change.paneKey, change.workspace.worktreeId, stamp)
+        }
       })
       this.release = () => {
         unsubscribe()
@@ -150,7 +159,8 @@ export class ConversationEvents {
     this.release?.()
     this.release = null
     this.listeners.clear()
-    this.turnStartedAt.clear()
+    this.unstampedTurn.clear()
+    this.announcedTurn.clear()
     this.rejected.clear()
   }
 
@@ -210,11 +220,8 @@ export class ConversationEvents {
           agent: link.agent,
           working,
           prompt: this.deps.pendingPrompt(link),
-          // The same id started() and takeTurnId() give this turn.
-          turnId:
-            this.turnStartedAt.get(link.paneKey) ??
-            row?.turnStartedAt ??
-            (row && working ? row.stateStartedAt : null),
+          // Unstamped and unseen: the working phase's start, as before stamps.
+          turnId: this.turnIdOf(link.paneKey, row) ?? (row && working ? row.stateStartedAt : null),
           activeAt: Math.max(link.createdAt, row?.receivedAt ?? 0)
         }
       })
@@ -226,9 +233,24 @@ export class ConversationEvents {
     if (!link) {
       return
     }
-    const at = item.row.turnStartedAt ?? item.row.stateStartedAt
-    this.turnStartedAt.set(item.paneKey, at)
-    this.emit({ kind: 'turn-started', ...pane(link, item.worktreeId), at })
+    if (item.row.turnStartedAt !== undefined) {
+      this.announceStamp(item.paneKey, item.worktreeId, item.row.turnStartedAt)
+      return
+    }
+    this.unstampedTurn.set(item.paneKey, item.row.stateStartedAt)
+    this.emit({ kind: 'turn-started', ...pane(link, item.worktreeId), at: item.row.stateStartedAt })
+  }
+
+  /** Told once per stamp; the cloud applies a start only if it is newer than its own anyway. */
+  private announceStamp(paneKey: string, worktreeId: string, at: number): void {
+    const link = this.linkedFor(paneKey)?.link
+    if (!link || this.announcedTurn.get(paneKey) === at) {
+      return
+    }
+    this.announcedTurn.set(paneKey, at)
+    // The host stamps this pane, so a start recorded before its first stamp names nothing.
+    this.unstampedTurn.delete(paneKey)
+    this.emit({ kind: 'turn-started', ...pane(link, worktreeId), at })
   }
 
   private told(item: TerminalAgentTurnNewsItem): void {
@@ -247,7 +269,7 @@ export class ConversationEvents {
     const verdict = judgeIdleAgentTurn(
       {
         rows: [item.row],
-        sentAt: this.turnStartedAt.get(item.paneKey) ?? 0,
+        sentAt: this.turnIdOf(item.paneKey, item.row) ?? 0,
         tail: [],
         readAgentCommands: () => []
       },
@@ -280,13 +302,19 @@ export class ConversationEvents {
     if (!link) {
       return null
     }
-    const turnId = this.turnStartedAt.get(paneKey) ?? this.deps.readHookRow(paneKey)?.turnStartedAt
-    return { key: { source: link.source, externalId: link.externalId }, turnId: turnId ?? null }
+    const turnId = this.turnIdOf(paneKey, this.deps.readHookRow(paneKey))
+    return { key: { source: link.source, externalId: link.externalId }, turnId }
   }
 
+  /** The turn a pane is in: the host's stamp, else the unstamped start news reported. */
+  private turnIdOf(paneKey: string, row: AgentStatusIpcPayload | null): number | null {
+    return row?.turnStartedAt ?? this.unstampedTurn.get(paneKey) ?? null
+  }
+
+  /** An ending turn's id; an unstamped one's start is forgotten with it, as before. */
   private takeTurnId(paneKey: string, row: AgentStatusIpcPayload): number | null {
-    const turnId = this.turnStartedAt.get(paneKey) ?? row.turnStartedAt ?? null
-    this.turnStartedAt.delete(paneKey)
+    const turnId = this.turnIdOf(paneKey, row)
+    this.unstampedTurn.delete(paneKey)
     return turnId
   }
 
diff --git a/src/main/external-conversations/external-conversation-prompts.test.ts b/src/main/external-conversations/external-conversation-prompts.test.ts
index 743ffc2a091..6d2374d1e93 100644
--- a/src/main/external-conversations/external-conversation-prompts.test.ts
+++ b/src/main/external-conversations/external-conversation-prompts.test.ts
@@ -205,6 +205,8 @@ describe('ExternalConversationSeam watch', () => {
       hookRow({
         state: 'done',
         stateStartedAt: 300,
+        // The host keeps the turn's stamp on its done row.
+        turnStartedAt: 100,
         lastAssistantMessage: 'Done.',
         mainAgent: { state: 'done', stateStartedAt: 300, outcome: 'success' }
       })
@@ -258,12 +260,72 @@ describe('ExternalConversationSeam watch', () => {
     })
     hookRows.set(PANE, hookRow({ state: 'working', turnStartedAt: 500 }))
     paneChange(moved('rest', 'working', 'prompt-submitted'))
-    hookRows.set(PANE, hookRow({ state: 'done', stateStartedAt: 400, sessionBoundary: false }))
+    hookRows.set(
+      PANE,
+      hookRow({ state: 'done', stateStartedAt: 400, turnStartedAt: 500, sessionBoundary: false })
+    )
     paneChange(moved('working', 'done', 'turn-finished'))
     paneChange({ ...moved('rest', 'working', 'prompt-submitted'), paneKey: 'tab-9:other' })
     expect(seen.map((event) => event.kind)).toEqual(['turn-started'])
   })
 
+  it('names a turn a new prompt opened after an approval by the host’s stamp everywhere', async () => {
+    const { seam, host, hookRows, paneChange } = await linked()
+    const seen: (ConversationSnapshot | ConversationEvent)[] = []
+    seam.watch(host, (event) => seen.push(event))
+    hookRows.set(PANE, hookRow({ state: 'working', turnStartedAt: 100 }))
+    paneChange(moved('rest', 'working', 'prompt-submitted'))
+    hookRows.set(PANE, { ...APPROVAL, turnStartedAt: 100 })
+    paneChange(moved('working', 'needs-you', 'needs-input'))
+    // The approval was dismissed and a new prompt sent: no prompt-submitted news, a new stamp.
+    hookRows.set(PANE, hookRow({ state: 'working', stateStartedAt: 300, turnStartedAt: 300 }))
+    paneChange(moved('needs-you', 'working', null))
+    expect(seen.at(-1)).toMatchObject({ kind: 'turn-started', at: 300 })
+    expect(seam.replyTarget(PANE)).toEqual({ key: KEY, turnId: 300 })
+    seam.watch(host, (event) => seen.push(event))
+    expect(seen.at(-1)).toMatchObject({ kind: 'snapshot', conversations: [{ turnId: 300 }] })
+    hookRows.set(PANE, { ...APPROVAL, stateStartedAt: 400, turnStartedAt: 300 })
+    paneChange(moved('working', 'needs-you', 'needs-input'))
+    hookRows.set(
+      PANE,
+      hookRow({
+        state: 'done',
+        stateStartedAt: 500,
+        turnStartedAt: 300,
+        mainAgent: { state: 'done', stateStartedAt: 500, outcome: 'success' }
+      })
+    )
+    paneChange(moved('needs-you', 'done', 'turn-finished'))
+    expect(seen.at(-1)).toMatchObject({ kind: 'turn-ended', turnId: 300 })
+  })
+
+  it('tells a stamp that lands on a row already working, once, and names the turn by it', async () => {
+    const { seam, host, hookRows, paneChange } = await linked()
+    const seen: ConversationEvent[] = []
+    seam.watch(host, (event) => {
+      if (event.kind !== 'snapshot') {
+        seen.push(event)
+      }
+    })
+    hookRows.set(PANE, hookRow({ state: 'working', stateStartedAt: 100 }))
+    paneChange(moved('rest', 'working', 'prompt-submitted'))
+    const observed: AgentPaneChange = {
+      kind: 'observed',
+      paneKey: PANE,
+      workspace: { worktreeId: WORKTREE, sshHostId: null },
+      phase: 'working',
+      at: 2
+    }
+    hookRows.set(PANE, hookRow({ state: 'working', stateStartedAt: 100, turnStartedAt: 200 }))
+    paneChange(observed)
+    paneChange(observed)
+    expect(seen.map((event) => event.kind === 'turn-started' && event.at)).toEqual([100, 200])
+    expect(seam.replyTarget(PANE)).toEqual({ key: KEY, turnId: 200 })
+    // A session boundary clears the stamp; the start seen before the first stamp doesn't come back.
+    hookRows.set(PANE, hookRow({ state: 'done', stateStartedAt: 300, sessionBoundary: true }))
+    expect(seam.replyTarget(PANE)).toEqual({ key: KEY, turnId: null })
+  })
+
   it('tells a watcher of a conversation linked while it watches', async () => {
     const h = harness()
     const host = {
diff --git a/src/main/external-conversations/external-conversation-turn-id.ts b/src/main/external-conversations/external-conversation-turn-id.ts
new file mode 100644
index 00000000000..477f83f68f6
--- /dev/null
+++ b/src/main/external-conversations/external-conversation-turn-id.ts
@@ -0,0 +1,14 @@
+// A conversation's turn is named by the host's stamp on its agent's hook row, wherever that stamp exists.
+import type { AgentStatusIpcPayload } from '../../shared/agent-status-ipc-payload'
+import { hookRowAgentPhase } from '../../shared/agent-transitions'
+
+/**
+ * The stamped turn a working row shows, however it got there: prompt news, a new prompt after a dismissed
+ * approval, or a stamp landing on a row already working. Null for other rows.
+ */
+export function workingStampedTurn(row: AgentStatusIpcPayload | null): number | null {
+  if (!row || row.structuredHost || hookRowAgentPhase(row) !== 'working') {
+    return null
+  }
+  return row.turnStartedAt ?? null
+}
diff --git a/src/main/runtime/terminal-agent-interrupt.ts b/src/main/runtime/terminal-agent-interrupt.ts
index b1566c9b094..7a73f37d6ab 100644
--- a/src/main/runtime/terminal-agent-interrupt.ts
+++ b/src/main/runtime/terminal-agent-interrupt.ts
@@ -1,4 +1,5 @@
 import type { AgentStatusIpcPayload } from '../../shared/agent-status-ipc-payload'
+import { mainAgentState } from '../../shared/main-agent-status'
 import { writeFencedAgentKeys } from './terminal-agent-fenced-keys'
 import type { TerminalAgentPromptAnswerRuntime } from './terminal-agent-prompt-answer'
 
@@ -38,7 +39,7 @@ export async function interruptWorkingAgent(
       throw new Error('agent_not_reachable')
     }
     // Escape stops only the main agent's turn; background work alone leaves an idle composer.
-    if ((row.mainAgent?.state ?? row.state) !== 'working') {
+    if (mainAgentState(row) !== 'working') {
       return null
     }
     const { ptyId, processIncarnation } = runtime.getTerminalPromptRequestBinding(handle)
diff --git a/src/shared/main-agent-status.ts b/src/shared/main-agent-status.ts
index aa2c30412ec..896044b2fb4 100644
--- a/src/shared/main-agent-status.ts
+++ b/src/shared/main-agent-status.ts
@@ -14,6 +14,14 @@ export type AgentMainAgentStatus = {
   stateStartedAt: number
 }
 
+/** The main agent's own state where the row carries one; older rows only have the combined state. */
+export function mainAgentState(row: {
+  state: AgentStatusState
+  mainAgent?: AgentMainAgentStatus
+}): AgentStatusState {
+  return row.mainAgent?.state ?? row.state
+}
+
 export function mainAgentStatusEqual(
   a: AgentMainAgentStatus | undefined,
   b: AgentMainAgentStatus | undefined