fix(desktop): task panel follows the todo_list wire name

The core-tool rename shipped `todo_list` on the wire (legacy alias `todo`
kept for old transcripts), but the Desktop renderer still matched the tool
by the literal `todo` in seven places: the live tool.start/tool.complete
mirror into the composer status stack, the todo-stream router, args
carry-over, the transcript hoist, the silent-tool class, the count noun,
and stored-history hydration. Every live task update therefore went into
the transcript as an ordinary tool row while the task panel stayed empty,
and reopening a chat never restored a finished list.

One predicate (`isTodoToolName`) now owns the wire/legacy name pair and
every site reads it.

apps/desktop/src/app/session/hooks/use-message-stream/index.ts

@@ -23,7 +23,7 @@ import {
   generatedImageEchoSources,
   stripGeneratedImageEchoes
 } from '@/lib/generated-images'
-import { nextTodosFromToolEvent, parseTodoRevision } from '@/lib/todos'
+import { isTodoToolName, nextTodosFromToolEvent, parseTodoRevision } from '@/lib/todos'
 import { dispatchNativeNotification } from '@/store/native-notifications'
 import { isDiskFullErrorMessage, notifyError } from '@/store/notifications'
 import { broadcastSessionsChanged } from '@/store/session-sync'
@@ -461,7 +461,7 @@ export function useMessageStream({
 
       // The composer status stack owns todo display now (no inline panel) —
       // mirror every todo state the tool reports into its session store.
-      if (payload?.name === 'todo') {
+      if (payload && isTodoToolName(payload.name)) {
         const todos = nextTodosFromToolEvent($todosBySession.get()[sessionId] ?? [], payload)
 
         if (todos) {

apps/desktop/src/app/session/hooks/use-message-stream/todo-cleanup.test.tsx

@@ -71,3 +71,31 @@ describe('useMessageStream turn-end todo cleanup', () => {
     expect($todosBySession.get()[SID]?.[0]?.id).toBe('live')
   })
 })
+
+describe('useMessageStream todo tool naming', () => {
+  afterEach(() => {
+    cleanup()
+    clearSessionTodos(SID)
+  })
+
+  // The backend renamed the tool to `todo_list` (core-tool deferral); the
+  // composer status stack must follow the wire name, not only the legacy alias.
+  it('feeds the task panel from a tool.complete named todo_list', () => {
+    mountStream()
+
+    act(() =>
+      stream.handleEvent({
+        payload: {
+          args: {},
+          name: 'todo_list',
+          result: { revision: 2, todos: [todo('wire', 'in_progress')] },
+          tool_id: 'c1'
+        },
+        session_id: SID,
+        type: 'tool.complete'
+      })
+    )
+
+    expect($todosBySession.get()[SID]?.[0]?.id).toBe('wire')
+  })
+})

apps/desktop/src/app/session/hooks/use-message-stream/utils.test.ts

@@ -25,7 +25,8 @@ describe('completionErrorText', () => {
 describe('toTodoPayload', () => {
   it('routes named todo and anonymous todos-bearing events to the todo stream', () => {
     expect(toTodoPayload(payload({ name: 'todo' }))?.tool_id).toBe('todo-live')
-    expect(toTodoPayload(payload({ todos: [] }))?.name).toBe('todo')
+    expect(toTodoPayload(payload({ todos: [] }))?.name).toBe('todo_list')
+    expect(toTodoPayload(payload({ name: 'todo_list' }))?.tool_id).toBe('todo-live')
     expect(toTodoPayload(payload({ name: 'web_search' }))).toBeUndefined()
     expect(toTodoPayload(undefined)).toBeUndefined()
   })

apps/desktop/src/app/session/hooks/use-message-stream/utils.ts

@@ -1,5 +1,6 @@
 import type { GatewayEventPayload } from '@/lib/chat-messages'
 import { normalizePersonalityValue } from '@/lib/chat-runtime'
+import { isTodoToolName } from '@/lib/todos'
 
 import type { ClientSessionState } from '../../../types'
 
@@ -142,9 +143,9 @@ export function toTodoPayload(payload: GatewayEventPayload | undefined): Gateway
     return undefined
   }
 
-  const isTodo = payload.name === 'todo' || (!payload.name && Object.hasOwn(payload, 'todos'))
+  const isTodo = isTodoToolName(payload.name) || (!payload.name && Object.hasOwn(payload, 'todos'))
 
-  return isTodo ? { ...payload, name: 'todo', tool_id: payload.tool_id || 'todo-live' } : undefined
+  return isTodo ? { ...payload, name: 'todo_list', tool_id: payload.tool_id || 'todo-live' } : undefined
 }
 
 function asRecord(value: unknown): Record<string, unknown> {

apps/desktop/src/components/assistant-ui/thread/message-parts.tsx

@@ -22,6 +22,7 @@ import { SCAFFOLD_LABEL_CLASS, SCAFFOLD_META_CLASS, ScaffoldRow } from '@/compon
 import { useI18n } from '@/i18n'
 import { generatedImageFromResult } from '@/lib/generated-images'
 import { separateGluedReasoningBlocks } from '@/lib/reasoning-blocks'
+import { isTodoToolName } from '@/lib/todos'
 import { useEnterAnimation } from '@/lib/use-enter-animation'
 import { cn } from '@/lib/utils'
 import { $reasoningCollapsedByDefault } from '@/store/reasoning-disclosure'
@@ -64,7 +65,7 @@ const DelegateToolPart: FC<TimelineToolCallProps> = props => {
 
 const ChainToolFallback: FC<TimelineToolCallProps> = props => {
   // todo parts are hoisted to a dedicated panel above the message content.
-  if (props.toolName === 'todo') {
+  if (isTodoToolName(props.toolName)) {
     return null
   }
 

apps/desktop/src/components/assistant-ui/tool/fallback-model/index.ts

@@ -348,6 +348,7 @@ const DEFAULT_COUNT_NOUN_BY_TOOL: Record<string, string> = {
   search_files: 'result',
   session_search_recall: 'result',
   todo: 'todo',
+  todo_list: 'todo',
   web_search: 'result'
 }
 

apps/desktop/src/lib/chat-messages/tool-parts.ts

@@ -1,5 +1,5 @@
 import { firstStringField, normalize } from '@/lib/text'
-import { parseTodos } from '@/lib/todos'
+import { isTodoToolName, parseTodos } from '@/lib/todos'
 import type { SessionMessage } from '@/types/hermes'
 
 import type { ChatMessage, ChatMessagePart, GatewayEventPayload } from './types'
@@ -231,7 +231,7 @@ function carryTodos(payload: GatewayEventPayload | undefined, ...prev: unknown[]
     return next === null ? undefined : { todos: next }
   }
 
-  if (payload?.name !== 'todo') {
+  if (!isTodoToolName(payload?.name)) {
     return undefined
   }
 

apps/desktop/src/lib/todos.ts

@@ -18,6 +18,10 @@ export interface TodoPatch {
 
 const STATUSES: readonly TodoStatus[] = ['pending', 'in_progress', 'completed', 'cancelled']
 
+/** The task tool is `todo_list` on the wire since the core-tool rename; `todo`
+ *  survives as the legacy alias in stored transcripts and older backends. */
+export const isTodoToolName = (name: unknown): boolean => name === 'todo_list' || name === 'todo'
+
 const isRecord = (v: unknown): v is Record<string, unknown> => Boolean(v && typeof v === 'object' && !Array.isArray(v))
 const isStatus = (v: unknown): v is TodoStatus => (STATUSES as readonly string[]).includes(v as string)
 
@@ -240,7 +244,7 @@ export function todosFromMessageContent(content: unknown): null | TodoItem[] {
   let latest: null | TodoItem[] = null
 
   for (const part of content) {
-    if (!isRecord(part) || part.type !== 'tool-call' || part.toolName !== 'todo') {
+    if (!isRecord(part) || part.type !== 'tool-call' || !isTodoToolName(part.toolName)) {
       continue
     }
 

apps/desktop/src/lib/tool-render-class.ts

@@ -39,7 +39,7 @@ export function isCardTool(toolName: string): boolean {
 // dedicated panel above the message content, and a reaction's UI is the emoji
 // landing on the bubble. Both still render when they FAIL, which is a bounded
 // error row either way.
-const SILENT_TOOL_NAMES = new Set(['react_to_message', 'todo'])
+const SILENT_TOOL_NAMES = new Set(['react_to_message', 'todo', 'todo_list'])
 
 export function isSilentTool(toolName: string): boolean {
   return SILENT_TOOL_NAMES.has(toolName)