Agent Postmortem Council

Agent postmortem council

A postmortem written in one pass under pressure blames whoever touched the deploy and ships vague actions no one owns. A council splits the work: one agent reconstructs what happened, one finds why, one writes what changes, and one checks the result is blameless and complete. Holding cause analysis apart from action drafting keeps the writeup from leaping to fixes before it understands the failure.

Method

1. Timeline builder reconstructs the sequence. Assemble events from alerts, deploy logs, dashboards, and chat into timeline.md: UTC timestamps, event, source, one line each. Mark the detection, escalation, and mitigation moments. Facts only, no interpretation yet.
2. Cause analyst separates trigger from root cause. Load site-reliability-engineer. Run contributing-factor analysis, five whys or a causal tree, over the timeline. Output causes.md: the trigger, the underlying cause, and the detection and mitigation gaps that let it grow. Blame lands on systems and gaps, never a named person.
3. Hold the blameless line. Any sentence shaped like "X should have" gets rewritten as "the system allowed" or "no guardrail caught". A postmortem that names a culprit teaches people to hide the next incident.
4. Action drafter turns causes into owned work. Output actions.md, one row per action with an owner, a due date, and a link to the specific cause it removes. Prefer actions that make the failure impossible over actions that ask people to be careful. An action with no cause link is scope creep.
5. Reviewer checks completeness and tone. Load incident-commander-role. Confirm every cause has at least one action, every action has an owner and a date, and no line assigns blame. Output a sign-off or a send-back naming the defects. A missing owner is a send-back.
6. One revision, then publish. The drafters address the send-back once. Publish to the postmortem-review-board record when the reviewer signs off; a second failed review escalates to a human facilitator rather than looping.

Run it

In Claude Code, run the four roles as subagents in sequence, passing timeline.md, causes.md, and actions.md as files on the incident's branch, with the orchestrator gating on the reviewer's sign-off. Terminate when the reviewer approves with every cause actioned and every action owned, or when a second review fails and a human facilitator takes over. To port, use a CrewAI sequential Crew with a final review task, an AutoGen GroupChat with a critic enforcing blamelessness, or a LangGraph pipeline with a review node that routes back to the drafter once.

Signals it works

• Every action row links to a cause and names an owner with a date.
• No sentence in the writeup blames a person by name or role.
• Causes split the trigger from the underlying weakness, not just the last click.

Boundaries

This council produces the writeup and action list, not the fixes; the actions hand off to the owning teams' backlogs. It follows the organization's blameless convention and severity definitions rather than inventing them, and it leaves the decision to close the incident to the incident commander.