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feat(coding-agent): add event bus for tool/hook communication (#431)

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* feat(coding-agent): add event bus for tool/hook communication

Adds pi.events API enabling custom tools and hooks to communicate via
pub/sub. Tools can emit events, hooks can listen. Shared EventBus instance
created per session in createAgentSession().

- EventBus interface with emit() and on() methods
- on() returns unsubscribe function
- Threaded through hook and tool loaders
- Documented in hooks.md and custom-tools.md

* fix(coding-agent): wrap event handlers to catch errors

* docs: note async handler error handling for event bus

* feat(coding-agent): add sendMessage to tools, nextTurn delivery mode

- Custom tools now have pi.sendMessage() for direct agent notifications
- New deliverAs: 'nextTurn' queues messages for next user prompt
- Fix: hooks and tools now share the same eventBus (was isolated before)

* fix(coding-agent): nextTurn delivery should always queue, even when streaming
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Nico Bailon 2026-01-04 12:36:19 -08:00 • committed by GitHub
parent 12805f61bd
commit 9c9e6822e3
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13 changed files with 293 additions and 33 deletions
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packages/coding-agent/CHANGELOG.md
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@ -43,6 +43,9 @@
- Tool registry now contains all built-in tools (read, bash, edit, write, grep, find, ls) even when `--tools` limits the initially active set. Hooks can enable any tool from the registry via `pi.setActiveTools()`.
- System prompt now automatically rebuilds when tools change via `setActiveTools()`, updating tool descriptions and guidelines to match the new tool set
- Hook errors now display full stack traces for easier debugging
- Event bus (`pi.events`) for tool/hook communication: shared pub/sub between custom tools and hooks
- Custom tools now have `pi.sendMessage()` to send messages directly to the agent session without needing the event bus
- `sendMessage()` supports `deliverAs: "nextTurn"` to queue messages for the next user prompt
### Changed