Merge pull request #2346 from deepseek-harness/fix/web-max-tokens-turn-end-notice

fix(web): surface max-tokens turn ends as a localized truncation notice

apps/web/tests/image-display.snapshot.ts

@@ -1,7 +1,7 @@
 // @vitest-environment jsdom
 // Multimodal image surfaces over the BUILT client graph (the code-mode-fixture
 // idiom: real bundles via AppWebEntry, keyless FixtureApiClient transport).
-// Opens the fixture history session whose turn 72 carries an image in BOTH a
+// Opens the fixture history session whose turn 73 carries an image in BOTH a
 // user message and an assistant message, and pins the product surfaces: the
 // history ImageGallery loading real fixture bytes through the authorized
 // sessions.attachment route, the single-click ImageLightbox, and the composer

apps/web/tests/max-tokens-notice.snapshot.ts

@@ -0,0 +1,56 @@
+// @vitest-environment jsdom
+// Assembled max-tokens snapshot: boots the real built `packages/client/*/lib/
+// client.js` bundles through AppWebEntry's ModuleLoader path against the
+// keyless FixtureApiClient transport, opens the fixture session, and pins the
+// surface its max-tokens turn (72) reaches — the turn-end notice row that a
+// provider output-cap truncation must render instead of ending silently.
+//
+// The dot state is pinned beside the copy on purpose: `dot=warning` is what
+// distinguishes this notice from the error row, so a regression that routes
+// max-tokens through the turn-error presentation changes this file even when
+// its own copy still renders.
+import { mkdirSync, writeFileSync } from 'node:fs'
+import { dirname, join } from 'node:path'
+import { fireEvent, screen, waitFor, within } from '@testing-library/react'
+import { describe, expect, it } from 'vitest'
+import { hasClass, installAssembledBootEnv, mountAssembledApp, REFRESHING_GOLDEN } from './assembled-boot.ts'
+
+const EXPECTED = join(process.cwd(), 'apps/web/tests/snapshots/max-tokens-notice/history-turn.expected.txt')
+
+installAssembledBootEnv()
+
+/** Normalize the notice row to stable fields: its dot state, title, and hint. */
+function noticeShape(row: Element): string {
+  const first = (name: string): string =>
+    [...row.querySelectorAll('*')].filter(el => hasClass(el, name))[0]?.textContent?.trim() ?? '<absent>'
+  return [
+    `dot=${row.querySelector('[data-state]')?.getAttribute('data-state') ?? '<absent>'}`,
+    `title=${first('maxTokensTitle')}`,
+    `hint=${first('turnErrorMessage')}`,
+  ].join('\n')
+}
+
+describe('assembled max-tokens turn-end notice', () => {
+  it('renders the localized truncation notice after the cut-off answer instead of ending silently', async () => {
+    mountAssembledApp()
+
+    const tree = await screen.findByRole('tree', { name: 'Sessions' }, { timeout: 10_000 })
+    fireEvent.click(await within(tree).findByText('Fixture 历史会话'))
+    // The truncated answer itself stays in the flow: the notice supplements the
+    // partial output, it never replaces it.
+    await screen.findByText(/条目 3：这一条写到一半被/, undefined, { timeout: 10_000 })
+    const row = await waitFor(() => {
+      const found = [...document.querySelectorAll('[role="status"]')]
+        .find(candidate => [...candidate.querySelectorAll('*')].some(el => hasClass(el, 'maxTokensTitle')))
+      expect(found).not.toBeUndefined()
+      return found!
+    }, { timeout: 10_000 })
+
+    const shape = noticeShape(row)
+    if (REFRESHING_GOLDEN) {
+      mkdirSync(dirname(EXPECTED), { recursive: true })
+      writeFileSync(EXPECTED, shape)
+    }
+    await expect(shape).toMatchFileSnapshot(EXPECTED)
+  })
+})

apps/web/tests/snapshots/max-tokens-notice/history-turn.expected.txt

@@ -0,0 +1,3 @@
+dot=warning
+title=Output token limit reached
+hint=The reply was cut off; earlier output is preserved in the conversation. Send "continue" to let the model resume.

apps/web/tests/todo-row.snapshot.ts

@@ -2,7 +2,7 @@
 // Assembled todo snapshot: boots the real built `packages/client/*/lib/
 // client.js` bundles through AppWebEntry's ModuleLoader path against the
 // keyless FixtureApiClient transport, opens the fixture session, and pins the
-// two surfaces the fixture's parallel plan (turn 73, two items `in_progress`)
+// two surfaces the fixture's parallel plan (turn 74, two items `in_progress`)
 // reaches — the `todo_write` tool row and the dock's plan strip.
 //
 // The row is pinned as three separate fields on purpose. `summary=` is the