chronometric-mark-end

Quick wrapper for mark_session_end on the local mcp-chronometric server. Closes the most-recent open session and returns its final metadata.

Authoritative schema: packages/mcp-chronometric/schemas/mark_session_end.schema.json.

When to use

• When the user says they're done with a focused block.
• At the end of a planning skill that opened a session at the top.
• After detecting a hard context switch (long idle, calendar transition,

explicit "I'm stopping").

What it does

Calls mcp__neurodock-chronometric__mark_session_end with an optional summary. The server:

1. Looks up the most recent open session for the user (no session_id

argument — by design, per ADR 0001).

1. Stamps ended_at (ISO 8601 with offset).
2. Computes duration as an ISO 8601 duration string.
3. Stores the summary verbatim alongside the original intent.
4. Returns session_id, started_at, ended_at, duration, intent,

summary.

Side effect: weekly rollup feeds on this

The verbatim intent + summary pair is the unit consumed by weekly_rollup (see packages/mcp-cognitive-graph/src/.../weekly_rollup.py). Sessions ended without a summary are still included but contribute less signal. Encourage the user to write a one-line summary even when nothing "finished" — "got distracted into refactor; did not finish the planned migration ADR" is more useful than no summary at all.

How to invoke

Minimal:

{}

With summary:

{
  "summary": "shipped the RFC reply, parked two follow-ups in inbox"
}

Constraints:

• summary is optional, 1–1000 chars, plain language.
• No session_id field — the server picks the most recent open session.

Example response:

{
  "session_id": "6f9f4f5e-3b1c-4e2a-9f7d-2b3c4d5e6f70",
  "started_at": "2026-05-23T09:14:22+01:00",
  "ended_at": "2026-05-23T10:42:18+01:00",
  "duration": "PT1H27M56S",
  "intent": "finish draft RFC reply",
  "summary": "shipped the RFC reply, parked two follow-ups in inbox"
}

Errors

• NO_OPEN_SESSION — caller thought a session was open; it was not.

Distinct from silent success so the caller can tell "I forgot to start one" from "this worked".

• SUMMARY_TOO_LONG — over 1000 chars. Trim and retry.

Limitations

• Cannot end an arbitrary historical session — only the currently open one.
• If two sessions are open (policy bug, see ADR 0001 open question), only

the most recent closes.

• Summary stored verbatim including PII; redaction is the caller's job.

Voice

Read the duration back plainly. Do not editorialise ("wow, an hour!" — no). Just the numbers and the user's own words. The summary is theirs, not something to reformulate.