feat: nest subagent sessions inside parent tile#22
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Subagents now appear nested within their parent session card instead of as separate dashboard tiles. Completed subagents are hidden from the tile (live command center view) but remain visible as expandable "Spawned Agent" blocks in the transcript history. Backend: - Add parent_session_id and agent_type columns to sessions table - SubagentStart/Stop hooks create linked subagent sessions with parent ref - API nests subagents array inside parent session responses - WebSocket initial_state and broadcasts include nested subagents - File watcher detects subagent transcript paths and sets parent link Frontend: - Dashboard tiles show collapsible active subagent rows with status/type/duration - WebSocket updates for subagents route to parent card (never create tiles) - Expand state persists across real-time re-renders - Transcript view renders Agent tool calls as "Spawned Agent" blocks with type badge, prompt, result summary, and expandable full conversation Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
The agent tool result's `content` field can be an object, not just a string. Coerce to String() before calling substring to prevent TypeError that silently broke the entire transcript rendering. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
When the watcher processes new JSONL entries for a session, it now updates last_activity_at. If the session was marked stale but new entries are arriving (user resumed the session), it resets status to idle. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
The tile now only shows subagents with status "working". When none are running, shows a subtle "N subagents completed" label. When some are running with others done, shows "N running (M done)". This keeps the command center focused on what's in flight right now. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Remove the "N subagents completed" label entirely. The tile is a live command center — if nothing is running, show nothing. Completed subagent history lives in the transcript view only. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
When the watcher creates a subagent session from a transcript file, set status to "working" so it appears on the tile. Previously it defaulted to "idle" which the tile filter excluded, making subagents invisible when hooks go to a different port. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
Screenshots
Dashboard tile with nested subagents
Transcript view with Spawned Agent block
Changes
Backend (db.py, hooks.py, api.py, ws.py, watcher.py):
parent_session_idandagent_typecolumns on sessions tableSubagentStart/SubagentStophooks create linked subagent sessionsFrontend (dashboard.js, app.js, terminal.js, style.css):
Tests: 9 new tests across test_db.py, test_hooks.py, test_api.py (264 total, all passing)
Closes #19
Follow-up: #21 (real-time streaming of subagent transcripts)
Test plan
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