Subagent observability: hierarchy, transitions, badges, live tail (fork CI) - #2
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JeanBaptisteRenard
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readSessionFile JSON.parse'd every line of a session file in a single outer try/catch. If a Claude CLI session was actively writing the file while the worker scan read it, one mid-write line could throw and invalidate the ENTIRE file's session row. With many parallel live sessions this manifested as 'most projects show no sessions after a fresh index'. - Per-line try/catch inside readSessionFile: skip malformed lines, keep parsing the rest. - Per-file try/catch in workers/scan-projects.js: defensive belt and braces so one unparseable file can't abort an entire folder scan.
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resolveWorktreePath was defined and exported in the file but never actually called from deriveProjectPath. As a result every worktree under <project>/.claude/worktrees/<name>/ appeared as a separate project group in the sidebar instead of being grouped under its parent project. Wire the call in both branches of deriveProjectPath (direct .jsonl path and subdirectory path) and export resolveWorktreePath for other callers.
session-transitions.js now tracks per-active-session knownSubagents and emits two new IPC events: - subagent-spawned (parentSessionId, agentId, subagentType, description) when a new agent-*.jsonl file appears under <sid>/subagents/ - subagent-completed (parentSessionId, agentId) when an existing file's mtime has been stable for >30s Adds two IPCs for read-only live tailing: - start-subagent-watch (parent, agentId) -> watchId - stop-subagent-watch (watchId) The watcher streams new JSONL entries via subagent-watch-event so the renderer can append them to an open inline-expanded subagent transcript without polling.
- sidebar.js: subagents are no longer flat siblings of their parent. Each top-level row now shows a 'N subagents' affordance with a disclosure caret; expanded children render indented with a subagentType pill, description as label, and persist expansion state per parent in localStorage. Orphan subagents (parent absent from cache) hoist to a 'Orphan subagents' group. - grid-view.js: each active session card now shows a stack of small pills for currently-running subagents, color-coded by subagentType, capped at 5 with a '+N more' overflow. Listens on onSubagentSpawned/onSubagentCompleted. - jsonl-viewer.js: when an inline-expanded subagent block represents a still- running agent, start an fs.watch via the new IPC and append streamed entries; show a small '● live' indicator until completion. Stops the watch on collapse or subagent-completed. - style.css: minimal styles for new sidebar/grid/live elements, matching existing palette and font weights.
When Switchboard attaches to a session that already has many subagent files on disk (e.g. a long-running session with 100+ Agent calls), the first walk of detectSubagentTransitions treated every existing file as a 'first sighting' and emitted subagent-spawned for each. 30s later it emitted subagent-completed for each. Hundreds of IPC events back to back froze the renderer UI. Distinguish bootstrap (first walk for this session) from steady-state. On bootstrap, record every existing file in knownSubagents silently: - files modified in the last 60s stay in the active lifecycle (could be mid-run, will eventually fire subagent-completed) - older files are marked completed immediately with no IPC Only files that appear AFTER the bootstrap walk fire subagent-spawned.
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Internal PR for local CI verification. Stacked on #1 (this fork) / doctly#47. Canonical upstream PR is doctly/switchboard#48.