Session Cleanup

Find prune-worthy sessions and explain cleanup — preview first, delete only on
explicit confirmation.

Input

The user provides: $ARGUMENTS

• Empty / preview → only show what would be removed (the safe default).
• confirm → the user has reviewed the preview and explicitly authorizes deletion.
• An optional staleness threshold (e.g. older than 7d) for what counts as stale.

Data Sources

Endpoint	Returns
GET /api/sessions?limit=N	session list: id, status, model, cwd, started_at, ended_at, cost, metadata (turn_count, total_turn_duration_ms)
GET /api/stats	totals: total_sessions, active_sessions, total_events, events_today, sessions_by_status, agents_by_status
POST /api/settings/cleanup	runs the cleanup routine and returns what was removed — DESTRUCTIVE, only after confirmation

Report Sections

1. Baseline

GET /api/stats — record total_sessions, sessions_by_status, total_events. This is
the before-state to compare against.

2. Identify candidates

GET /api/sessions?limit=1000. Flag sessions that are:

• Empty — zero events and turn_count 0 / null and cost 0 (started but never
  did anything).
• Stale active — status active/working but last activity older than the
  threshold (default 24h), i.e. never cleanly stopped.
• Truncated — no ended_at and no recent events.

3. Preview table (ALWAYS shown)

List every candidate with the reason it qualifies. State the total count and confirm
that nothing has been deleted yet.

4. Explain the endpoint

Describe POST /api/settings/cleanup: it prunes empty / orphaned sessions and their
dangling events server-side and returns a summary of removed rows. Make clear this
is permanent and not reversible from the dashboard.

5. Execute only on confirmation

If — and only if — $ARGUMENTS is confirm (or the user has explicitly approved
this run), call POST /api/settings/cleanup, then re-read /api/stats and report
the before → after delta. Otherwise stop after the preview and tell the user to
re-run with confirm.

Output

A preview Markdown table: id (short) | status | reason | cwd basename | started_at | cost,
then a one-line count and the explicit "nothing deleted — re-run with confirm to
proceed" notice. On a confirmed run, add a before → after summary using ▲/▼ on the
counts. Currency as USD to 4 decimal places.

Safety

• This is the ONLY skill in the plugin that mutates data, and only via the one
  documented endpoint.
• NEVER call POST /api/settings/cleanup without an explicit confirm from the
  user in this turn — previewing is the default.
• Never widen scope to POST /api/settings/clear-data or any other destructive
  endpoint; cleanup of stale/empty sessions only.
• If the dashboard is unreachable, tell the user to start it with npm start from
  the repo root.