CLAUDE.md

pi-thinking-timer

Pi extension that shows a live elapsed timer on collapsed thinking blocks.

Structure

• thinking-timer.ts -- the entire extension, single file
• package.json -- pi package manifest

How it works

1. Monkey-patches AssistantMessageComponent.updateContent() (once, guarded by a Symbol)
2. Listens to message_update for thinking_start/thinking_delta/thinking_end stream events
3. Records start times in a Map, finalizes durations on end
4. A 100ms setInterval ticker updates label Text nodes while thinking is active
5. State is stored on globalThis so the patch (which survives /reload) can find fresh state

Key constraints

• The patch must never throw -- all patched code is wrapped in try/catch
• State uses a globalThis key so /reload replaces the state object cleanly
• The Symbol-guarded patch persists across reloads (prototype mutation is permanent)
• Labels map stores references to rendered Text components for the ticker to update between re-renders

Testing

pi -e ./thinking-timer.ts

Use a model with thinking enabled and collapse the thinking block with Ctrl+T.