codex-retrospective SKILL.md skillA
codex-retrospective from majiayu000/spellbook is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add majiayu000/spellbook/codex-retrospective@git:20260622.a472c7bPins git:20260622.a472c7b in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- majiayu000/spellbook
- Path
skills/codex-retrospective/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260622.a472c7b, committed Jun 22, 2026
- First version recorded
- May 28, 2026
- Size
- 6,305 bytes
- Repository stars
- 290
- License
- MIT
Use when you want Codex to review its own recent history (last N days or specific period) and improve its behavior. Produces minimal, high-signal updates to AGENTS.md and tiny reusable skills. The goal is long-term fluency — Codex gradually becomes better at your specific style, constraints, and workflows.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Codex Retrospective
A structured self-improvement loop for Codex.
This skill turns Codex from a one-off collaborator into a system that **gets meaningfully better at working with you** over time by systematically eating its own usage history.
## Why This Exists
Most people improve their agent usage by manually maintaining `AGENTS.md` or skills when they notice problems. This skill makes that process deliberate, regular, and high-leverage.
It is directly inspired by strong practices from heavy users (especially Greg Brockman's emphasis on updating the "constitution" from real failures and friction), but executed as a repeatable arsenal-style workflow.
## Core Principle
**Minimal effective change, grounded in evidence from actual history.**
Every output must be:
- The smallest possible useful addition or edit
- Backed by specific patterns observed in recent sessions
- Designed to prevent repetition of the same friction
## When to Trigger
- After a painful or repetitive session ("Codex should have known better by now")
- Periodically (weekly or monthly): "Do a retrospective on the last 7/30 days of my Codex usage"
…Read the whole file at its exact version.
How to install
mdr add majiayu000/spellbook/codex-retrospective@sha256:5c28e95c2a59af5eThe line at the top of this page pins the label git:20260622.a472c7b, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_jjggsfv2mla7b5uk)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between May 28, 2026 and Jun 22, 2026, about one every 12 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260622.a472c7b latest | 2026-06-22 | a472c7b | 6,305 B | A | view · diff |
| git:20260610.de062df | 2026-06-10 | de062df | 5,321 B | A | view · diff |
| git:20260528.88c681b | 2026-05-28 | 88c681b | 4,705 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6305 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
majiayu000/spellbook · 290 stars · license MIT · pushed 2026-11-04 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_jjggsfv2mla7b5uk GET https://markdownregistry.com/api/v1/resolve?ref=majiayu000/spellbook/codex-retrospective GET https://markdownregistry.com/api/v1/blob/5c28e95c2a59af5e4b1fddce090e6428d0a92a368b17517513ae2cde85087c52
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.