feat(ui): enhance LoadingIndicator to display token counts and improve formatting

- Added candidatesTokens prop to LoadingIndicator for displaying token counts.
- Updated formatting to show elapsed time and token counts inline.
- Refactored tests to validate new token display functionality and formatting changes.
- Introduced formatTokenCount utility for consistent token count representation.

This improves user feedback during loading states by providing clearer information on token usage.

packages/cli/src/ui/components/Composer.tsx

@@ -27,7 +27,15 @@ export const Composer = () => {
   const uiActions = useUIActions();
   const { vimEnabled } = useVimMode();
 
-  const { showAutoAcceptIndicator } = uiState;
+  const { showAutoAcceptIndicator, sessionStats } = uiState;
+
+  const tokens = Object.values(sessionStats.metrics.models).reduce(
+    (acc, model) => ({
+      prompt: acc.prompt + model.tokens.prompt,
+      candidates: acc.candidates + model.tokens.candidates,
+    }),
+    { prompt: 0, candidates: 0 },
+  );
 
   // State for keyboard shortcuts display toggle
   const [showShortcuts, setShowShortcuts] = useState(false);
@@ -64,6 +72,7 @@ export const Composer = () => {
               : uiState.currentLoadingPhrase
           }
           elapsedTime={uiState.elapsedTime}
+          candidatesTokens={tokens.candidates}
         />
       )}
 

packages/cli/src/ui/components/LoadingIndicator.test.tsx

@@ -72,7 +72,8 @@ describe('<LoadingIndicator />', () => {
     const output = lastFrame();
     expect(output).toContain('MockRespondingSpinner');
     expect(output).toContain('Loading...');
-    expect(output).toContain('(esc to cancel, 5s)');
+    expect(output).toContain('5s');
+    expect(output).toContain('esc to cancel');
   });
 
   it('should render spinner (static), phrase but no time/cancel when streamingState is WaitingForConfirmation', () => {
@@ -88,7 +89,7 @@ describe('<LoadingIndicator />', () => {
     expect(output).toContain('⠏'); // Static char for WaitingForConfirmation
     expect(output).toContain('Confirm action');
     expect(output).not.toContain('(esc to cancel)');
-    expect(output).not.toContain(', 10s');
+    expect(output).not.toContain('10s');
   });
 
   it('should display the currentLoadingPhrase correctly', () => {
@@ -112,7 +113,7 @@ describe('<LoadingIndicator />', () => {
       <LoadingIndicator {...props} />,
       StreamingState.Responding,
     );
-    expect(lastFrame()).toContain('(esc to cancel, 1m)');
+    expect(lastFrame()).toContain('(1m · esc to cancel)');
   });
 
   it('should display the elapsedTime correctly in human-readable format', () => {
@@ -124,7 +125,7 @@ describe('<LoadingIndicator />', () => {
       <LoadingIndicator {...props} />,
       StreamingState.Responding,
     );
-    expect(lastFrame()).toContain('(esc to cancel, 2m 5s)');
+    expect(lastFrame()).toContain('(2m 5s · esc to cancel)');
   });
 
   it('should render rightContent when provided', () => {
@@ -155,7 +156,7 @@ describe('<LoadingIndicator />', () => {
     let output = lastFrame();
     expect(output).toContain('MockRespondingSpinner');
     expect(output).toContain('Now Responding');
-    expect(output).toContain('(esc to cancel, 2s)');
+    expect(output).toContain('(2s · esc to cancel)');
 
     // Transition to WaitingForConfirmation
     rerender(
@@ -170,7 +171,7 @@ describe('<LoadingIndicator />', () => {
     expect(output).toContain('⠏');
     expect(output).toContain('Please Confirm');
     expect(output).not.toContain('(esc to cancel)');
-    expect(output).not.toContain(', 15s');
+    expect(output).not.toContain('15s');
 
     // Transition back to Idle
     rerender(
@@ -262,7 +263,7 @@ describe('<LoadingIndicator />', () => {
       // Check for single line output
       expect(output?.includes('\n')).toBe(false);
       expect(output).toContain('Loading...');
-      expect(output).toContain('(esc to cancel, 5s)');
+      expect(output).toContain('(5s · esc to cancel)');
       expect(output).toContain('Right');
     });
 
@@ -284,8 +285,8 @@ describe('<LoadingIndicator />', () => {
       expect(lines).toHaveLength(3);
       if (lines) {
         expect(lines[0]).toContain('Loading...');
-        expect(lines[0]).not.toContain('(esc to cancel, 5s)');
-        expect(lines[1]).toContain('(esc to cancel, 5s)');
+        expect(lines[0]).not.toContain('5s');
+        expect(lines[1]).toContain('5s');
         expect(lines[2]).toContain('Right');
       }
     });
@@ -308,4 +309,86 @@ describe('<LoadingIndicator />', () => {
       expect(lastFrame()?.includes('\n')).toBe(true);
     });
   });
+
+  describe('token display', () => {
+    it('should display output tokens inline with arrow notation', () => {
+      const { lastFrame } = renderWithContext(
+        <LoadingIndicator
+          {...defaultProps}
+          promptTokens={1500}
+          candidatesTokens={847}
+        />,
+        StreamingState.Responding,
+      );
+      const output = lastFrame();
+      expect(output).toContain('↓ 847 tokens');
+      expect(output).not.toContain('↑');
+      expect(output).toContain('5s');
+      expect(output).toContain('esc to cancel');
+    });
+
+    it('should not display tokens when output tokens is 0', () => {
+      const { lastFrame } = renderWithContext(
+        <LoadingIndicator
+          {...defaultProps}
+          promptTokens={1500}
+          candidatesTokens={0}
+        />,
+        StreamingState.Responding,
+      );
+      const output = lastFrame();
+      expect(output).not.toContain('↓');
+      expect(output).not.toContain('tokens');
+    });
+
+    it('should not display tokens when props are undefined', () => {
+      const { lastFrame } = renderWithContext(
+        <LoadingIndicator {...defaultProps} />,
+        StreamingState.Responding,
+      );
+      const output = lastFrame();
+      expect(output).not.toContain('↓');
+      expect(output).not.toContain('tokens');
+    });
+
+    it('should hide tokens in narrow terminal', () => {
+      const { lastFrame } = renderWithContext(
+        <LoadingIndicator
+          {...defaultProps}
+          promptTokens={1000}
+          candidatesTokens={500}
+        />,
+        StreamingState.Responding,
+        79,
+      );
+      const output = lastFrame();
+      expect(output).not.toContain('↓');
+      expect(output).not.toContain('tokens');
+      expect(output).toContain('esc to cancel');
+    });
+
+    it('should show tokens in wide terminal with inline format', () => {
+      const { lastFrame } = renderWithContext(
+        <LoadingIndicator
+          {...defaultProps}
+          promptTokens={1000}
+          candidatesTokens={5400}
+        />,
+        StreamingState.Responding,
+        80,
+      );
+      const output = lastFrame();
+      expect(output).toContain('↓ 5.4k tokens');
+    });
+
+    it('should format tokens inline with time and cancel', () => {
+      const { lastFrame } = renderWithContext(
+        <LoadingIndicator {...defaultProps} candidatesTokens={5400} />,
+        StreamingState.Responding,
+        120,
+      );
+      const output = lastFrame();
+      expect(output).toContain('(5s · ↓ 5.4k tokens · esc to cancel)');
+    });
+  });
 });

packages/cli/src/ui/components/LoadingIndicator.tsx

@@ -11,7 +11,7 @@ import { theme } from '../semantic-colors.js';
 import { useStreamingContext } from '../contexts/StreamingContext.js';
 import { StreamingState } from '../types.js';
 import { GeminiRespondingSpinner } from './GeminiRespondingSpinner.js';
-import { formatDuration } from '../utils/formatters.js';
+import { formatDuration, formatTokenCount } from '../utils/formatters.js';
 import { useTerminalSize } from '../hooks/useTerminalSize.js';
 import { isNarrowWidth } from '../utils/isNarrowWidth.js';
 import { t } from '../../i18n/index.js';
@@ -21,6 +21,7 @@ interface LoadingIndicatorProps {
   elapsedTime: number;
   rightContent?: React.ReactNode;
   thought?: ThoughtSummary | null;
+  candidatesTokens?: number;
 }
 
 export const LoadingIndicator: React.FC<LoadingIndicatorProps> = ({
@@ -28,6 +29,7 @@ export const LoadingIndicator: React.FC<LoadingIndicatorProps> = ({
   elapsedTime,
   rightContent,
   thought,
+  candidatesTokens,
 }) => {
   const streamingState = useStreamingContext();
   const { columns: terminalWidth } = useTerminalSize();
@@ -39,13 +41,21 @@ export const LoadingIndicator: React.FC<LoadingIndicatorProps> = ({
 
   const primaryText = thought?.subject || currentLoadingPhrase;
 
+  const outputTokens = candidatesTokens ?? 0;
+  const showTokens = !isNarrow && outputTokens > 0;
+
+  const timeStr =
+    elapsedTime < 60 ? `${elapsedTime}s` : formatDuration(elapsedTime * 1000);
+
+  const tokenStr = showTokens
+    ? ` · ↓ ${formatTokenCount(outputTokens)} tokens`
+    : '';
+
   const cancelAndTimerContent =
     streamingState !== StreamingState.WaitingForConfirmation
-      ? t('(esc to cancel, {{time}})', {
-          time:
-            elapsedTime < 60
-              ? `${elapsedTime}s`
-              : formatDuration(elapsedTime * 1000),
+      ? t('({{time}}{{tokens}} · esc to cancel)', {
+          time: timeStr,
+          tokens: tokenStr,
         })
       : null;
 

packages/cli/src/ui/components/__snapshots__/LoadingIndicator.test.tsx.snap

@@ -1,6 +1,6 @@
 // Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
 
 exports[`<LoadingIndicator /> > should truncate long primary text instead of wrapping 1`] = `
-"MockResponding This is an extremely long loading phrase that should be truncated in t (esc to
-Spinner                                                                              cancel, 5s)"
+"MockResponding This is an extremely long loading phrase that should be truncated in t (5s · esc to
+Spinner                                                                              cancel)"
 `;