fix(client): handle singular grouped tool labels

client/src/components/Chat/Messages/Content/ToolCallGroup.tsx

@@ -191,8 +191,7 @@ export default function ToolCallGroup({
 
   /** `ask_user_question` calls form their own category, mirroring subagents:
    *  a homogeneous group reads "Asking/Asked N questions" (never "Used N
-   *  tools — ask_user_question") with a question glyph. A group only exists
-   *  at count >= 2, so the plural is always grammatical. */
+   *  tools — ask_user_question") with a question glyph. */
   const askQuestionCount = useMemo(
     () => toolNames.filter((n) => n === ASK_USER_QUESTION).length,
     [toolNames],
@@ -327,11 +326,19 @@ export default function ToolCallGroup({
    *  category (with tense), everything else is the generic "Used N tools". */
   const resolveGroupLabel = (): string => {
     if (allSubagents) {
+      if (count === 1) {
+        return localize(subagentsDone ? 'com_ui_subagent_complete' : 'com_ui_subagent_running');
+      }
       return subagentsDone
         ? localize('com_ui_ran_n_agents', { 0: String(count) })
         : localize('com_ui_running_n_agents', { 0: String(count) });
     }
     if (allAskQuestions) {
+      if (count === 1) {
+        return localize(
+          askQuestionsDone ? 'com_ui_asked_one_question' : 'com_ui_asking_one_question',
+        );
+      }
       return askQuestionsDone
         ? localize('com_ui_asked_n_questions', { 0: String(count) })
         : localize('com_ui_asking_n_questions', { 0: String(count) });

client/src/components/Chat/Messages/Content/__tests__/ToolCallGroup.test.tsx

@@ -17,6 +17,18 @@ jest.mock('~/hooks', () => ({
     if (key === 'com_ui_asking_n_questions') {
       return `Asking ${values?.[0]} questions`;
     }
+    if (key === 'com_ui_asked_one_question') {
+      return 'Asked 1 question';
+    }
+    if (key === 'com_ui_asking_one_question') {
+      return 'Asking 1 question';
+    }
+    if (key === 'com_ui_subagent_complete') {
+      return 'Ran agent';
+    }
+    if (key === 'com_ui_subagent_running') {
+      return 'Running agent';
+    }
     if (key === 'com_ui_via_server') {
       return `via ${values?.[0]}`;
     }
@@ -607,6 +619,48 @@ describe('ToolCallGroup image hoisting', () => {
     expect(screen.getByRole('button', { name: 'Asking 2 questions' })).toBeInTheDocument();
   });
 
+  it('uses a singular completed label for one question grouped with reasoning', () => {
+    renderGroup({
+      ...baseProps,
+      parts: [{ part: makePart('q1', 'blue', 'ask_user_question'), idx: 0 }],
+      lastContentIdx: 0,
+    });
+
+    expect(screen.getByRole('button', { name: 'Asked 1 question' })).toBeInTheDocument();
+  });
+
+  it('uses a singular active label for one question grouped with reasoning', () => {
+    renderGroup({
+      ...baseProps,
+      isSubmitting: true,
+      parts: [{ part: makePart('q1', '', 'ask_user_question'), idx: 0 }],
+      lastContentIdx: 0,
+    });
+
+    expect(screen.getByRole('button', { name: 'Asking 1 question' })).toBeInTheDocument();
+  });
+
+  it('uses a singular completed label for one subagent grouped with reasoning', () => {
+    renderGroup({
+      ...baseProps,
+      parts: [{ part: makePart('a1', 'done', Constants.SUBAGENT), idx: 0 }],
+      lastContentIdx: 0,
+    });
+
+    expect(screen.getByRole('button', { name: 'Ran agent' })).toBeInTheDocument();
+  });
+
+  it('uses a singular active label for one subagent grouped with reasoning', () => {
+    renderGroup({
+      ...baseProps,
+      isSubmitting: true,
+      parts: [{ part: makePart('a1', '', Constants.SUBAGENT), idx: 0 }],
+      lastContentIdx: 0,
+    });
+
+    expect(screen.getByRole('button', { name: 'Running agent' })).toBeInTheDocument();
+  });
+
   it('keeps the generic "Used N tools" label for a mixed group containing a question', () => {
     renderGroup({
       ...baseProps,

client/src/locales/en/translation.json

@@ -920,8 +920,10 @@
   "com_ui_ask_type_below_only": "Type your answer below",
   "com_ui_ask_user": "Ask User",
   "com_ui_asked": "Asked",
+  "com_ui_asked_one_question": "Asked 1 question",
   "com_ui_asked_n_questions": "Asked {{0}} questions",
   "com_ui_asking": "Asking",
+  "com_ui_asking_one_question": "Asking 1 question",
   "com_ui_asking_n_questions": "Asking {{0}} questions",
   "com_ui_assistant": "Assistant",
   "com_ui_assistant_delete_error": "There was an error deleting the assistant",