agent-incident-postmortem

agent-incident-postmortem is a cursor rule for Cursor from mohitagw15856/pm-claude-skills. It costs 113 tokens per session (1,230 once invoked), scanned A, original, MIT.

A postmortem guide for an incident involving an AI agent or language-model feature. A postmortem is a blameless record of what happened, why it happened, who or what was affected, and how to prevent a repeat.

In plain words
What is it for?
It helps reconstruct the request and tool activity, identify the earliest contributing cause, document impact and detection, and add lasting corrective tests.
Why use it?
AI systems can produce harmful results without going offline, and ordinary outage reports may miss what the model saw, decided, and did.

Cursor rule for Cursor

Written for Cursor: a Cursor rule (.mdc).

Good fit It helps reconstruct the request and tool activity, identify the earliest contributing cause, document impact and detection, and add lasting corrective tests.

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Install with agentmods
npx agentmods add rules/mohitagw15856/pm-claude-skills/agent-incident-postmortem
About the project

PM Skills is a collection of plain-Markdown instructions that teach AI assistants structured methods for handling professional, personal, and life-admin tasks. People use it with Claude, ChatGPT, Gemini, Cursor, Codex, and other supported agents for work such as writing product requirements, reviewing documents, or planning difficult situations.

mohitagw15856/pm-claude-skills · 1,345 stars · on GitHub · mohitagw15856.github.io

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/mohitagw15856/pm-claude-skills

Made for: Cursor.

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 agent-incident-postmortem

README.md
[![agentmods](https://agentmods.dev/badge/rules/mohitagw15856/pm-claude-skills/agent-incident-postmortem/github.svg)](https://agentmods.dev/rules/mohitagw15856/pm-claude-skills/agent-incident-postmortem)
Your own site
<a href="https://agentmods.dev/rules/mohitagw15856/pm-claude-skills/agent-incident-postmortem"><img src="https://agentmods.dev/badge/rules/mohitagw15856/pm-claude-skills/agent-incident-postmortem/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 agent-incident-postmortem

Your own site · 80×15
<a href="https://agentmods.dev/rules/mohitagw15856/pm-claude-skills/agent-incident-postmortem"><img src="https://agentmods.dev/badge/rules/mohitagw15856/pm-claude-skills/agent-incident-postmortem.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 113 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,230 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 $0.00113 $0.01230
Opus 5 $0.00056 $0.00615
Sonnet 5 $0.00023 $0.00246
Haiku 4.5 $0.00011 $0.00123

Measured 6d ago against content hash 31463f825254, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

agent-incident-postmortem 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 6d 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.

exports/cursor/pm-agentops/agent-incident-postmortem/agent-incident-postmortem.mdc · 92 lines

How it starts

The opening of the file, as written. The whole thing — 92 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Agent Incident Postmortem Skill

AI incidents differ from outages: the system didn't go down — it did something wrong, confidently, and maybe only once. This skill adapts blameless postmortem practice to nondeterministic systems, where "can we reproduce it?" needs traces, not just steps.

What This Skill Produces

  • A blameless postmortem document with timeline and user/business impact
  • A trace reconstruction of what the agent saw, decided, and did
  • A root-cause analysis across the AI failure layers (not "the model hallucinated" as a conclusion)
  • Corrective actions — always including a new permanent case in the regression suite

Required Inputs

Ask for (if not already provided):

  • What the agent did and what it should have done
  • The trace — the full request: system prompt, context, tool calls and results, output. If no trace exists, that absence is itself a finding
  • Blast radius — how many users/requests, over what window, and whether it's ongoing
  • Detection — how it was noticed (user report? monitor? luck?) and how long after it started

Root-Cause Layers

Walk the layers in order; the root cause is usually the earliest layer that could have prevented the outcome. "The model was wrong" is a starting point, never the conclusion — models are known to be fallible, so the question is what let a fallible output become an incident.

Layer Ask
Input / context Was the context wrong, stale, contradictory, or poisoned (injection)? Did retrieval feed it bad ground truth?
Model behaviour Given that context, was the output a foreseeable failure mode (fabrication under missing data, over-compliance with injected text)?
Guardrails What check should have caught this output and didn't exist / didn't fire? (schema validation, groundedness check, action allow-list)
Action layer Why could the wrong output become a real action or reach a user without the appropriate gate for its risk level?
Detection Why did we learn about it this way, this late? What signal would have caught it in minutes?

Read the full file on GitHub · 92 lines

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. 6d ago First seen · 92 lines · 113 tokens per session scan A 31463f825254

Subscribe to this mod's changes

agent-incident-postmortem is a cursor rule published in the GitHub repository mohitagw15856/pm-claude-skills (1,345 stars, last pushed 2d ago), licensed MIT. It adds 113 tokens to every session and 1,230 once invoked, about $0.0006 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 2026-09-03.