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Write A Postmortem

Category: General  ·  Sub-category: operations  ·  Last updated:
type:review
Write a blameless incident postmortem under postmortems/ following the Google SRE shape — evidence-based timeline, trigger vs root cause vs symptom, contributing factors, what went well, and owned+dated+verifiable action items. Read when asked to write a postmortem, do an incident review, run a root cause analysis, write up the outage, retro on the outage, or when the user says we had an incident and wants it documented. Do NOT read to frame a proposal (use frame-a-proposal), write a spec (use write-a-spec), record a decision (use record-a-decision), or review a design (use review-a-design) — a postmortem documents an incident that already happened, it does not propose, specify, decide, or critique future work.
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

The platform open-knowledge skill still governs every markdown operation here — folder scope, the read/write tool surface, linking, and preview. This skill layers postmortem craft on top of it; it does not replace those rules.

What this skill does

Write A Postmortem is a community-contributed Claude Code skill in the operations sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/write-a-postmortem/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Write A Postmortem Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 176,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/write-a-postmortem
curl -L https://claudskills.com/skills/write-a-postmortem/SKILL.md \
  -o ~/.claude/skills/write-a-postmortem/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/write-a-postmortem/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/write-a-postmortem/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\write-a-postmortem\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Write A Postmortem Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/write-a-postmortem/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Write A Postmortem skill do?
Write a blameless incident postmortem under postmortems/ following the Google SRE shape — evidence-based timeline, trigger vs root cause vs symptom, contributing factors, what went well, and owned+dated+verifiable action items. Read when asked to write a postmortem, do an incident review, run a root cause analysis, write up the outage, retro on the outage, or when the user says we had an incident and wants it documented. Do NOT read to frame a proposal (use frame-a-proposal), write a spec (use write-a-spec), record a decision (use record-a-decision), or review a design (use review-a-design) — a postmortem documents an incident that already happened, it does not propose, specify, decide, or critique future work.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Write A Postmortem skill?
Use Write A Postmortem when your Claude Code task falls under the General category — specifically in the operations area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Write A Postmortem" or describe the task and let Claude pick). Browse related skills at /category/general/.
What is a Claude Code skill and how does the Write A Postmortem skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Write A Postmortem is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
inkeep. (2026). Write A Postmortem [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/write-a-postmortem/
BibTeX
@misc{write-a-postmortem-2026,
  author    = {inkeep},
  title     = {Write A Postmortem [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/write-a-postmortem/}
}

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Security scan

Grade A · scanned 2026-08-05 — free static scan against the OWASP Agentic Skills Top 10.

The scan flagged 1 of 10 categories (execution), including lower-severity patterns. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.

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