# Objective

Fix unreliable working/status indicators for ACP agent threads.

ACP threads update their internal running state when a turn starts,
completes, or is canceled, but those status-only changes were not being
emitted as thread events. The agent UI could miss transitions unless
another entry-related event happened nearby, making it particularly hard
to monitor the status of multiple agent threads running at once.

Hope this helps, and thanks for making Zed.

## Solution

- Add an `AcpThreadEvent::StatusChanged` event.
- Emit it when `running_turn` is set, cleared, or canceled.
- Have `ConversationView` handle the event by syncing the active thread
view's generating indicator.
- Treat status changes as UI state only, not root thread metadata
changes.

## Testing

- `cargo check -p sidebar -p project -p git_ui -p workspace`
- Manually verified in a local dev build on macOS that ACP agent
status/working indicators update reliably.

No automated test was added; this changes UI synchronization for ACP
thread status events.

## Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content adheres to Zed's UI standards
([UX/UI](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
and
[icon](https://github.com/zed-industries/zed/blob/main/crates/icons/README.md)
guidelines)
- [ ] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

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Release Notes:

- Fixed unreliable working indicators for ACP agent threads.