feat: start fresh research chats while preserving deck context

README.md

@@ -103,6 +103,10 @@ accounts' lists before planning new searches, then read relevant list columns
 for evidence. Follow-ups can reuse catalogs already fetched in the conversation.
 Manual deck creation and column editing remain
 available. The backend handles tools even when the browser is closed.
+Use **新しいチャット** to clear the current conversation and start a fresh Codex
+thread with your next message. The open deck and host reports remain available.
+If a turn is running, stop it first. The conversation reset is shared across
+open devices; previous conversations are not listed in this prototype.
 Each turn is limited to 6 columns, 12 upstream requests shared between list
 discovery and post retrieval (at most 20 posts per fetch), and 15 minutes.
 The prototype accepts up to 100 messages per backend process.

docs/plans/2026-09-24-home-agent-research.md

@@ -75,6 +75,13 @@ editing a deck is a valid completed turn. Reports, when requested, remain host
 Markdown files. SSE snapshots include the conversation and latest generated
 deck so reopening a page restores both without restarting work or polling.
 
+The chat header can reset an idle conversation. The next message starts a new
+Codex thread while retaining the browser's current deck as context. Reset pushes
+an empty conversation to every subscriber, preserves host reports and does not
+delete deck definitions. Active turns must be stopped first; a stale reset must
+not clear a newer conversation started on another device. This does not add a
+conversation-history UI.
+
 ## Verification
 
 - Protocol tests for dynamic-tool requests, failures, cancellation and process
@@ -202,3 +209,13 @@ be handled by the backend so research can continue without the initiating tab.
   an upstream `Dependency: Unspecified` error; a direct retry through the same
   Bird catalog API returned three lists. A follow-up message in the same Codex
   conversation then retried `list_lists` successfully and also reported three.
+
+## New-chat verification
+
+- 284 unit/component tests and eight desktop/mobile research E2E cases passed,
+  along with typecheck, lint and production build.
+- A real Codex check on a separate development server reset a completed chat
+  across two browser pages, cleared the draft and retained the current deck.
+  The next message used a different thread ID, contained only the new user
+  message and received the current deck context. The separate server avoided
+  interrupting research already running in the public workspace.

src/features/research/research-panel.css

@@ -11,6 +11,11 @@
   overflow: hidden;
 }
 .research-heading {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  flex-wrap: wrap;
+  gap: 0.5rem;
   padding: 1rem;
   border-bottom: 1px solid var(--border);
 }
@@ -18,6 +23,12 @@
   margin: 0;
   font-size: 1rem;
 }
+.research-heading p {
+  width: 100%;
+}
+.research-heading button {
+  font-size: 0.75rem;
+}
 .research-heading p,
 .research-context {
   margin: 0.5rem 0 0;

src/features/research/research-panel.test.tsx

@@ -9,12 +9,14 @@ const actions = vi.hoisted(() => ({
   status: vi.fn(),
   start: vi.fn(),
   cancel: vi.fn(),
+  reset: vi.fn(),
 }))
 vi.mock('@tanstack/react-start', () => ({ useServerFn: (fn: unknown) => fn }))
 vi.mock('./server-functions', () => ({
   loadResearchStatus: actions.status,
   startResearch: actions.start,
   cancelResearch: actions.cancel,
+  resetResearch: actions.reset,
 }))
 
 const connection: Connection = {
@@ -374,3 +376,91 @@ it('selects newly loaded connected accounts until the user changes their selecti
   })
   expect(screen.getByRole('button', { name: '送信' })).toBeEnabled()
 })
+
+it('starts a new chat without changing the deck and clears the draft only after success', async () => {
+  current = {
+    configured: true,
+    run: { ...running, status: 'complete', threadId: 'old-thread' },
+  }
+  actions.reset
+    .mockRejectedValueOnce(new Error('offline'))
+    .mockResolvedValue({ configured: true, run: null })
+  const view = show()
+  await waitFor(() =>
+    expect(
+      screen.getByRole('button', { name: '新しいチャット' }),
+    ).toBeEnabled(),
+  )
+  fireEvent.change(screen.getByLabelText('メッセージ'), {
+    target: { value: '下書き' },
+  })
+  fireEvent.click(screen.getByRole('button', { name: '新しいチャット' }))
+  expect(await screen.findByRole('alert')).toHaveTextContent(
+    '会話と入力内容は残っています',
+  )
+  expect(screen.getByLabelText('メッセージ')).toHaveValue('下書き')
+  const callsBeforeReset = view.onOpenDeck.mock.calls.length
+  fireEvent.click(screen.getByRole('button', { name: '新しいチャット' }))
+  await waitFor(() =>
+    expect(screen.getByLabelText('メッセージ')).toHaveValue(''),
+  )
+  expect(screen.queryByText('WebMCPの反応')).toBeNull()
+  expect(view.onOpenDeck).toHaveBeenCalledTimes(callsBeforeReset)
+  expect(screen.getByText('手動デッキ')).toBeVisible()
+  fireEvent.change(screen.getByLabelText('メッセージ'), {
+    target: { value: '新しい話題' },
+  })
+  fireEvent.click(screen.getByRole('button', { name: '送信' }))
+  await waitFor(() => expect(actions.start).toHaveBeenCalledOnce())
+  expect(actions.start.mock.calls[0]?.[0].data).not.toHaveProperty('runId')
+  expect(actions.reset).toHaveBeenCalledWith({ data: { id: running.id } })
+})
+
+it('disables new chat during a running turn and receives another device reset over SSE', async () => {
+  current = { configured: true, run: running }
+  const view = show()
+  await screen.findByText('WebMCPの反応')
+  expect(screen.getByRole('button', { name: '新しいチャット' })).toBeDisabled()
+  const callsBeforeReset = view.onOpenDeck.mock.calls.length
+  act(() =>
+    MockEventSource.instances[0]?.onmessage?.({
+      data: JSON.stringify({ configured: true, run: null }),
+    }),
+  )
+  await waitFor(() => expect(screen.queryByText('WebMCPの反応')).toBeNull())
+  expect(view.onOpenDeck).toHaveBeenCalledTimes(callsBeforeReset)
+  expect(actions.reset).not.toHaveBeenCalled()
+})
+
+it('does not let a late reset response erase a newer streamed conversation', async () => {
+  current = { configured: true, run: { ...running, status: 'complete' } }
+  let finish!: (snapshot: typeof current) => void
+  actions.reset.mockImplementation(
+    () =>
+      new Promise<typeof current>((resolve) => {
+        finish = resolve
+      }),
+  )
+  const view = show()
+  await waitFor(() =>
+    expect(
+      screen.getByRole('button', { name: '新しいチャット' }),
+    ).toBeEnabled(),
+  )
+  fireEvent.click(screen.getByRole('button', { name: '新しいチャット' }))
+  const newer = {
+    configured: true,
+    run: {
+      ...running,
+      id: 'new-run',
+      messages: [{ id: 'new-user', role: 'user', text: '別端末の新しい話題' }],
+    },
+  }
+  act(() =>
+    MockEventSource.instances[0]?.onmessage?.({ data: JSON.stringify(newer) }),
+  )
+  await screen.findByText('別端末の新しい話題')
+  await act(async () => finish({ configured: true, run: null }))
+  expect(view.client.getQueryData(['research-status'])).toEqual(newer)
+  expect(screen.getByText('別端末の新しい話題')).toBeVisible()
+})

src/features/research/research-panel.tsx

@@ -7,6 +7,7 @@ import { isResearchActive, type ResearchRun } from './model'
 import {
   cancelResearch,
   loadResearchStatus,
+  resetResearch,
   startResearch,
 } from './server-functions'
 import './research-panel.css'
@@ -34,6 +35,7 @@ export function ResearchPanel({
   const fetchStatus = useServerFn(loadResearchStatus)
   const start = useServerFn(startResearch)
   const cancel = useServerFn(cancelResearch)
+  const reset = useServerFn(resetResearch)
   const client = useQueryClient()
   const status = useQuery({
     queryKey: ['research-status'],
@@ -44,6 +46,8 @@ export function ResearchPanel({
   const [busy, setBusy] = useState(false)
   const [error, setError] = useState<string>()
   const [reconnecting, setReconnecting] = useState(false)
+  const [draftResetVersion, setDraftResetVersion] = useState(0)
+  const previousRunId = useRef<string | null>(null)
   const attemptedVersion = useRef<string | null>(null)
   const pendingTurn = useRef<{
     runId?: string
@@ -61,6 +65,15 @@ export function ResearchPanel({
   )
   const request = useRef<{ signature: string; id: string } | null>(null)
 
+  useEffect(() => {
+    if (!run && previousRunId.current) {
+      setDraftResetVersion((value) => value + 1)
+      request.current = null
+      pendingTurn.current = null
+    }
+    previousRunId.current = run?.id ?? null
+  }, [run])
+
   useEffect(() => {
     const events = new EventSource('/api/research/events')
     events.onopen = () => setReconnecting(false)
@@ -128,9 +141,7 @@ export function ResearchPanel({
       client.setQueryData<{ configured: boolean; run: ResearchRun | null }>(
         ['research-status'],
         (existing) =>
-          existing !== beforeStart && existing?.run?.id === next.id
-            ? existing
-            : { configured: true, run: next },
+          existing !== beforeStart ? existing : { configured: true, run: next },
       )
       return true
     } catch {
@@ -146,14 +157,19 @@ export function ResearchPanel({
 
   async function stop() {
     if (!run) return
+    const beforeCancel = client.getQueryData(['research-status'])
     setBusy(true)
     setError(undefined)
     try {
       const next = await cancel({ data: { id: run.id } })
-      client.setQueryData(['research-status'], {
-        configured: status.data?.configured ?? true,
-        run: next,
-      })
+      client.setQueryData(['research-status'], (existing: unknown) =>
+        existing === beforeCancel
+          ? {
+              configured: status.data?.configured ?? true,
+              run: next,
+            }
+          : existing,
+      )
     } catch {
       setError('調査を中止できませんでした。もう一度お試しください。')
     } finally {
@@ -161,6 +177,28 @@ export function ResearchPanel({
     }
   }
 
+  async function newChat() {
+    if (!run || isResearchActive(run)) return
+    const beforeReset = client.getQueryData(['research-status'])
+    setBusy(true)
+    setError(undefined)
+    try {
+      const next = await reset({ data: { id: run.id } })
+      client.setQueryData(['research-status'], (existing: unknown) =>
+        existing === beforeReset ? next : existing,
+      )
+      request.current = null
+      pendingTurn.current = null
+      setDraftResetVersion((value) => value + 1)
+    } catch {
+      setError(
+        '新しいチャットを開始できませんでした。会話と入力内容は残っています。もう一度お試しください。',
+      )
+    } finally {
+      setBusy(false)
+    }
+  }
+
   async function openDeck(deck: Deck) {
     setBusy(true)
     setError(undefined)
@@ -179,6 +217,18 @@ export function ResearchPanel({
     <aside className="research-panel" aria-label="調査チャット">
       <header className="research-heading">
         <h2>調査チャット</h2>
+        <button
+          type="button"
+          disabled={busy || !run || isResearchActive(run)}
+          title={
+            isResearchActive(run)
+              ? '調査を中止してから新しいチャットを開始できます'
+              : undefined
+          }
+          onClick={() => void newChat()}
+        >
+          新しいチャット
+        </button>
         <p>会話に合わせて右のデッキが変わります。</p>
       </header>
       {reconnecting && (
@@ -214,6 +264,7 @@ export function ResearchPanel({
         />
       )}
       <ResearchComposer
+        resetVersion={draftResetVersion}
         connections={connections}
         contextTitle={contextDeck.title}
         disabled={
@@ -272,11 +323,13 @@ function ResearchConversation({
 }
 
 function ResearchComposer({
+  resetVersion,
   connections,
   contextTitle,
   disabled,
   onSend,
 }: {
+  resetVersion: number
   connections: Connection[]
   contextTitle: string
   disabled: boolean
@@ -286,6 +339,9 @@ function ResearchComposer({
     (connection) => connection.status === 'connected',
   )
   const [topic, setTopic] = useState('')
+  useEffect(() => {
+    if (resetVersion > 0) setTopic('')
+  }, [resetVersion])
   const [selected, setSelected] = useState<string[] | null>(null)
   const selectedIds =
     selected ?? available.slice(0, 6).map((connection) => connection.id)

src/features/research/runner.server.ts

@@ -339,6 +339,20 @@ export function createResearchService(
 
   return {
     status: snapshot,
+    reset(id: string) {
+      if (isResearchActive(run) || state?.stopping)
+        throw new Error(
+          '調査中です。中止してから新しいチャットを開始してください。',
+        )
+      if (run && run.id !== id)
+        throw new Error(
+          '別のチャットが開かれています。最新の状態を確認してください。',
+        )
+      run = null
+      state = undefined
+      emit()
+      return snapshot()
+    },
     subscribe(listener: (snapshot: ResearchSnapshot) => void) {
       listeners.add(listener)
       publish(listener)

src/features/research/runner.test.ts

@@ -1,6 +1,6 @@
 // @vitest-environment node
 import { randomUUID } from 'node:crypto'
-import { mkdtemp, rm, writeFile } from 'node:fs/promises'
+import { mkdtemp, readFile, rm, writeFile } from 'node:fs/promises'
 import { tmpdir } from 'node:os'
 import { join } from 'node:path'
 import { afterEach, beforeEach, expect, it, vi } from 'vitest'
@@ -418,6 +418,45 @@ it('rejects unknown continuation IDs', () => {
   )
 })
 
+it('resets a completed conversation for every viewer and starts a fresh thread without deleting its report', async () => {
+  const first = service.start(input())
+  const old = await running()
+  const reportPath = join(directory, first.id, 'report.md')
+  await writeFile(reportPath, '# Saved research')
+  old.completed()
+  await vi.waitFor(() => expect(service.status().run?.status).toBe('complete'))
+  const listener = vi.fn()
+  service.subscribe(listener)
+  expect(service.reset(first.id)).toEqual({ configured: true, run: null })
+  expect(listener).toHaveBeenLastCalledWith({ configured: true, run: null })
+  expect(service.reset(first.id).run).toBeNull()
+  expect(await readFile(reportPath, 'utf8')).toBe('# Saved research')
+  expect(() => service.start({ ...input(), runId: first.id })).toThrow(
+    '続ける会話が見つかりません',
+  )
+  const next = service.start(input())
+  const current = await running()
+  expect(next.id).not.toBe(first.id)
+  expect(current.calls).toHaveBeenCalledWith('thread/start', expect.anything())
+  expect(current.calls).not.toHaveBeenCalledWith(
+    'thread/resume',
+    expect.anything(),
+  )
+  expect(service.status().run?.messages).toHaveLength(1)
+  old.completed()
+  expect(service.status().run?.id).toBe(next.id)
+})
+
+it('requires an active turn to stop before resetting and rejects a stale reset from another viewer', async () => {
+  const first = service.start(input())
+  await running()
+  expect(() => service.reset(first.id)).toThrow('中止してから')
+  await service.cancel(first.id)
+  expect(() => service.reset(randomUUID())).toThrow('別のチャット')
+  expect(service.status().run?.id).toBe(first.id)
+  expect(service.reset(first.id).run).toBeNull()
+})
+
 it('keeps the generated deck identity across turns while advancing its version', async () => {
   const first = service.start(input())
   const old = await running()

src/features/research/server-functions.ts

@@ -20,3 +20,10 @@ export const cancelResearch = createServerFn({ method: 'POST' })
     const { researchService } = await import('./runner.server')
     return researchService().cancel(data.id)
   })
+
+export const resetResearch = createServerFn({ method: 'POST' })
+  .validator(z.object({ id: z.string().uuid() }).strict())
+  .handler(async ({ data }) => {
+    const { researchService } = await import('./runner.server')
+    return researchService().reset(data.id)
+  })