postmortem-writeup

postmortem-writeup is a command for Claude Code from Amey-Thakur/AI-SKILLS. It costs 20 tokens per session (372 once invoked), scanned A, original, MIT.

A command that writes a blameless incident postmortem. An incident postmortem records what went wrong, why the system allowed it, and how to reduce the chance or impact of a repeat.

In plain words
What is it for?
Use it to document impact and timelines, find systemic causes with the 5 Whys, and create concrete preventive actions.
Why use it?
It moves investigation away from blaming individuals and toward fixing weaknesses in systems and processes. It turns an incident into specific, owned follow-up work.

Command for Claude Code

Written for Claude Code: argument-hint in frontmatter.

Good fit Use it to document impact and timelines, find systemic causes with the 5 Whys, and create concrete preventive actions.

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Install with agentmods
npx agentmods add commands/amey-thakur/ai-skills/postmortem-writeup
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/Amey-Thakur/AI-SKILLS

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for postmortem-writeup

README.md
[![agentmods](https://agentmods.dev/badge/commands/amey-thakur/ai-skills/postmortem-writeup/github.svg)](https://agentmods.dev/commands/amey-thakur/ai-skills/postmortem-writeup)
Your own site
<a href="https://agentmods.dev/commands/amey-thakur/ai-skills/postmortem-writeup"><img src="https://agentmods.dev/badge/commands/amey-thakur/ai-skills/postmortem-writeup/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for postmortem-writeup

Your own site · 80×15
<a href="https://agentmods.dev/commands/amey-thakur/ai-skills/postmortem-writeup"><img src="https://agentmods.dev/badge/commands/amey-thakur/ai-skills/postmortem-writeup.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 20 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 372 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00020 $0.00372
Opus 5 $0.00010 $0.00186
Sonnet 5 $0.00004 $0.00074
Haiku 4.5 $0.00002 $0.00037

Measured 2d ago against content hash 72ca6ecca2cc, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

postmortem-writeup scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

commands/postmortem-writeup.md · 41 lines

What it actually says

You were invoked as a slash command. The user's input:

$ARGUMENTS

Use that input to fill this prompt's variables (take the main content, topic, or task from it; ask only if a required value is missing and not supplied), then follow the prompt exactly.


Write a blameless postmortem for:

{incident}

Details: {details}

Structure:

  • Summary: what happened, the impact (users, duration, severity), in a few lines a busy reader can grasp.
  • Timeline: the sequence from first signal to resolution, with times. Include detection (how we found out) and the key decisions.
  • Root cause: the systemic cause, not the person. Use "5 whys" to get past the proximate trigger to why the system allowed it (why did the bad deploy ship, why did the check not catch it, why did the alert not fire).
  • What went well and what went poorly: honestly, including detection time and response.
  • Action items: specific, owned, and dated changes that prevent recurrence or reduce impact. Each must be concrete ("add a canary check for X"), not aspirational ("be more careful"). Prioritize by impact.

Rules: blameless: focus on systems and processes, never blame individuals (people act reasonably given the information and tools they had). The value is the action items that make the class of failure less likely, so make them real and assignable. Distinguish root cause from trigger. If the timeline or cause has gaps, mark what needs to be confirmed rather than guessing.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 41 lines · 20 tokens per session scan A 72ca6ecca2cc

Subscribe to this mod's changes

postmortem-writeup is a command published in the GitHub repository Amey-Thakur/AI-SKILLS (7 stars, last pushed 3d ago), licensed MIT. It adds 20 tokens to every session and 372 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-06.