superplan-postmortem

A short retrospective process for capturing reusable lessons from completed, failed, or unexpectedly difficult work. A postmortem is a record of what happened, why, and what should change.

In plain words
What is it for?
Use it to separate facts from causes, record traps in gotchas notes, and document process or policy changes for future tasks.
Why use it?
It turns recurring mistakes and process weaknesses into concrete checks or rules that can prevent them from happening again.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/superplan-md/superplan-plugin/superplan-postmortem
Any agent
npx skills add superplan-md/superplan-plugin --skill superplan-postmortem
Clone the repo
git clone --depth 1 https://github.com/superplan-md/superplan-plugin

Made for: Claude Code, Codex.

Per session 29 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 341 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00029 $0.00341
Opus 5 $0.00015 $0.00170
Sonnet 5 $0.00006 $0.00068
Haiku 4.5 $0.00003 $0.00034

Measured 2d ago against content hash c76b7f5920c8, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

superplan-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 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.

output/skills/superplan-postmortem/SKILL.md · 53 lines

What it actually says

Retrospective Postmortem

Overview

Turn completed or failed work into reusable learning.

This skill exists to reduce repeated mistakes, not to assign blame.

Trigger

Use when:

  • a task finished and the team wants to learn from it
  • a task failed, thrashed, or took an unexpected path
  • a recurring trap or process weakness became visible

Stay Out

Do not use when:

  • execution is still actively blocked on basic facts
  • the task is mid-flight and the right next move is still direct execution
  • there is nothing durable to learn beyond ordinary completion notes

Core Rules

  • separate facts, causes, and follow-up changes
  • capture what went wrong and what almost went wrong
  • identify one or two concrete rules, checks, or habits that would prevent recurrence
  • keep the writeup concise enough to be reusable
  • record recurring traps in .superplan/gotchas.md
  • record process or policy changes in .superplan/decisions.md

Forbidden Behavior

  • blame-oriented writing
  • vague lessons like "be more careful"
  • rewriting history to make the path look cleaner than it was
  • producing a long transcript instead of actionable learning

Handoff

Likely follow-ons:

  • superplan-guard when a test or proof path should be added
  • superplan-docs when the docs or help misled the work
  • superplan-shape when the underlying task breakdown needs to change
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 · 53 lines · 29 tokens per session scan A c76b7f5920c8

Subscribe to this mod's changes

superplan-postmortem is a skill published in the GitHub repository superplan-md/superplan-plugin (72 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 29 tokens to every session and 341 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 2026-08-30.

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