postmortem-writing

Write effective blameless postmortems with root cause analysis, timelines, and action items. Use when conducting incident reviews, writing postmortem documents, or improving incident response processes.

1.17x

Quality

71%

Does it follow best practices?

Impact

99%

1.17x

Average score across 3 eval scenarios

Securityby

Passed

No known issues

Optimize this skill with Tessl

npx tessl skill review --optimize ./plugins/incident-response/skills/postmortem-writing/SKILL.md

Evaluation results

100%

31%

Storefront Checkout Outage — Post-Incident Write-Up

Standard postmortem document

Criteria

Without context

With context

Blameless language

100%

Required header fields

100%

Executive Summary present

100%

UTC timeline table

100%

RCA subsections

62%

100%

Contributing factors listed

100%

Detection section

66%

100%

Impact subsections

37%

100%

Lessons Learned subsections

25%

100%

Action items table format

50%

100%

No orphan action items

57%

100%

Appendix section

50%

100%

Response section present

50%

100%

99%

Authentication Service Failure — Root Cause Deep Dive

5 Whys root cause analysis

Criteria

Without context

With context

5 Whys structure

100%

Evidence per step

100%

Problem statement

100%

Multiple root causes

100%

Root cause classification

100%

75%

Systemic improvements table

75%

100%

Reaches organisational depth

100%

Blameless framing

100%

Proximate vs systemic distinction

100%

Actionable improvements

100%

13%

Data Pipeline Incident — Facilitate the Postmortem Review Meeting

Postmortem meeting facilitation

Criteria

Without context

With context

5 meeting phases

100%

Correct time allocations

50%

100%

Total 60 minutes

100%

Blameless opening

100%

Redirect blame to systems

100%

Encourage quiet participants

100%

Time-box tangents

100%

Document dissenting views

28%

100%

Action item format with owners

70%

100%

Closing confirms owners

100%

Anti-pattern avoidance

100%

Analysis discussion questions

100%

Repository: wshobson/agents
Commit: 91fe43e

Evaluated: 27 days ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Storefront Checkout Outage — Post-Incident Write-Up Authentication Service Failure — Root Cause Deep Dive Data Pipeline Incident — Facilitate the Postmortem Review Meeting

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