Hook Failure Audit

Assess whether the hook pipeline is delivering events reliably, using the event
counts and stream the dashboard already has. This is about delivery health
(missing/dropped events), not about why a model errored.

Input

The user provides: $ARGUMENTS

This may be:

• empty or "all" — run every check (default)
• "balance" — PreToolUse/PostToolUse balance only
• "terminators" — missing Stop/SubagentStop only
• "freshness" — stale-ingestion check only

Data Sources

Endpoint	Returns
GET /api/analytics	event_types (counts per type: PreToolUse, PostToolUse, Stop, SubagentStop, SessionStart, SessionEnd), daily_events (365d), total_subagents, sessions_by_status — fleet-wide delivery balance
GET /api/stats	total_sessions, total_agents, total_events, events_today — expected terminator counts and recency
GET /api/events?session_id=X	Per-session stream — confirm which sessions are missing a PostToolUse, Stop, or SubagentStop

Report Sections

1. PreToolUse / PostToolUse Balance

From GET /api/analytics event_types: gap = PreToolUse − PostToolUse. A positive gap means tools whose completion hook never arrived. Report the gap as a count and as a percentage of PreToolUse. A healthy pipeline keeps this near 0%.

2. Missing Terminators

Compare Stop count against completed sessions (sessions_by_status) and SubagentStop against total_subagents/total_agents (from /api/stats). A shortfall means sessions or subagents that ran but never emitted a closing hook — likely dropped delivery or a crashed handler. Report expected vs observed for each.

3. Stale Ingestion

Check events_today from /api/stats and the tail of daily_events from analytics. If recent days are empty while sessions exist, ingestion has stalled. Report the most recent day with events and how long ago that was.

4. Localize

For the sessions with the largest gaps or missing terminators, pull GET /api/events?session_id=X and confirm which specific hook types are absent. List the offending session IDs.

Output

• A check-by-check report with a PASS / WARN / FAIL marker each (✅ / ⚠️ / ❌) and the expected-vs-observed numbers.
• Rates as percentages to 2 decimals.
• Cite exact event_type counts and session_id values — never fabricate.
• End with an overall verdict (e.g., "4/4 checks passed" or "hook delivery DEGRADED") and the single highest-impact remediation (e.g., reinstall hooks via the dashboard Settings, or restart the server with npm start).
• Read-only: only report what the API returns. If curl cannot reach http://localhost:4820, tell the user to start the dashboard with npm start from the repo root.