Principle Postmortem

Q: What is a Claude Code skill and how does the Principle 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. Principle Postmortem is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: General · Sub-category: operations · Last updated: 2026-06-04

type:review

Postmortem principles — blameless culture, root cause analysis (5 Whys, Fishbone), incident document structure, action-item discipline, MTTD/MTTR metrics. Auto-load when running a blameless review, structuring an incident report, facilitating RCA, tracking action items after an outage, or improving incident response processes.

From the source SKILL.md

Incidents are inevitable. A postmortem converts failure into systemic learning — the goal is not to assign blame but to close the gap between what the system can do and what the environment demands. The prevent → detect → learn triad is incomplete without this phase.

What this skill does

Principle 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/principle-postmortem/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Principle 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 88,000+ 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/principle-postmortem
curl -L https://claudskills.com/skills/principle-postmortem/SKILL.md \
  -o ~/.claude/skills/principle-postmortem/SKILL.md

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

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

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 Principle Postmortem Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/principle-postmortem/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Principle Postmortem skill do?

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 Principle Postmortem skill?

Use Principle 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 Principle 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 Principle 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. Principle 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

Source: https://github.com/lugassawan/swe-workbench/blob/HEAD/skills/principle-postmortem/SKILL.md
License: MIT
Author: lugassawan

Cite this skill

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

APA

lugassawan. (2026). Principle Postmortem [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/principle-postmortem/

BibTeX

@misc{principle-postmortem-2026,
  author    = {lugassawan},
  title     = {Principle Postmortem [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/principle-postmortem/}
}

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Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills. · What's New · Install guide · About · llms.txt

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