feat: unified sidebar with threads, tasks, and sub-agents#85
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The sidebar now shows three types of items: 1. Chat threads (from ThreadManager) - conversation contexts 2. Running tasks (from TaskManager) - background work 3. Sub-agent sessions (from SessionManager) - spawned workers send_threads_update() now queries all three sources and merges them into a unified list for the TUI sidebar. Terminal tasks/sessions older than 5 minutes are filtered out to keep the sidebar clean.
- New tool: thread_describe - sets description of current thread - Uses marker-based interception (THREAD_UPDATE_MARKER) - Gateway intercepts marker and updates ThreadManager - Sends ThreadsUpdate after description change - Added set_foreground_description() to ThreadManager This allows the agent to set/update thread descriptions dynamically, which appear in the sidebar.
New module: threads/ - unified representation of all concurrent work ThreadKind: - Chat: user-interactive conversations - SubAgent: spawned workers (ephemeral, autonomous) - Background: long-running monitors - Task: one-shot work that returns result ThreadStatus: - Active, Running (with progress), WaitingForInput - Paused, Completed, Failed, Cancelled ThreadManager: - Create/manage all thread types - Event emission on state changes (Created, StatusChanged, etc.) - Foreground switching - Context building from backgrounded threads - Persistence to JSON - Automatic cleanup of old ephemeral threads ThreadEvent: - Push-based notifications for sidebar updates - triggers_sidebar_update() to filter relevant events This unifies the previous split between TaskManager, ThreadManager, and SessionManager into a single coherent model.
- rename(id, label) - change thread label - find_best_match(content) - find thread matching message keywords - task_id() alias on AgentThread for backwards compatibility These are needed for gateway integration.
- Replace crate::tasks::ThreadManager with crate::threads::ThreadManager - Replace TaskId with ThreadId throughout gateway - Update concurrent.rs to use ThreadId - Add compatibility methods: create_thread(), switch_to(), task_id() - Add message methods: compaction_prompt(), apply_compaction(), build_context() - Add TaskId type alias for backwards compatibility - Fix ThreadInfoDto mapping for new ThreadInfo.status type The old tasks::ThreadManager still exists but is no longer used by gateway. Next step: remove it and clean up.
- Subscribe to ThreadManager events in connection handler - Add select! branch to handle ThreadEvent messages - Call send_threads_update() when event.triggers_sidebar_update() is true This replaces periodic polling with event-driven updates. When a thread status changes, the sidebar updates immediately without the TUI needing to poll.
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Summary
The sidebar now shows a unified view of all concurrent work:
sessions_spawnChanges
send_threads_update()to query all three sourcestask_mgrparameter to the functionSessionManagerare included with status indicatorsTesting
All 345+ tests pass.
What this enables
When you ask the agent to spawn background work via
sessions_spawn, those sub-agents will now appear in the sidebar with their status (Running, Completed, Failed, etc.) and description.