codex SKILL.md skillA

codex from majiayu000/spellbook is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add majiayu000/spellbook/codex@git:20261007.a10192c

Pins git:20261007.a10192c 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/SKILL.md
Versions recorded: 6
Latest version: git:20261007.a10192c, committed Oct 7, 2026
First version recorded: Jun 10, 2026
Size: 8,389 bytes
Repository stars: 288
License: MIT

Use when the user asks to run Codex CLI (codex exec, codex resume) or references OpenAI Codex for code analysis, refactoring, or automated editing.

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 Skill Guide

## Operating Contract
1. Run `codex --version` and `codex exec --help` first. Stop if Codex is unavailable, and only use flags shown by the installed CLI.
2. If the user did not specify a model or reasoning effort, use the installed default. Do not hardcode a model list; model names and supported reasoning levels change over time.
3. Select the smallest sandbox needed: `--sandbox read-only` for inspection and `--sandbox workspace-write` for requested local edits. Network access, extra writable roots, and broader modes are separate grants.
4. Assemble the command from supported options such as:
   - `-m, --model <MODEL>`
   - `--config model_reasoning_effort="<LEVEL>"`
   - `--sandbox <read-only|workspace-write|danger-full-access>`
   - `-C, --cd <DIR>`
   - `--add-dir <DIR>`
   - `--json`
   - `--ephemeral`
   - `--skip-git-repo-check`
   - `--dangerously-bypass-approvals-and-sandbox`
5. Do not use `--skip-git-repo-check` by default. Use it only when the user explicitly asks to run outside a Git repository or has approved that boundary bypass for this command.
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add majiayu000/spellbook/codex@sha256:1175535f7b1fba37

The line at the top of this page pins the label git:20261007.a10192c, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_hbe3ela7oir5io3s.svg)](https://markdownregistry.com/a/art_hbe3ela7oir5io3s)

4 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 6 versions of this file, between Jun 10, 2026 and Oct 7, 2026, about one every 24 days.

version	committed	commit	size	audit
git:20261007.a10192c latest	2026-10-07	a10192c	8,389 B	A	view · diff
git:20260830.5b9004f	2026-08-30	5b9004f	8,297 B	A	view · diff
git:20260619.9f35213	2026-06-19	9f35213	4,616 B	A	view · diff
git:20260613.c4ca4e6	2026-06-13	c4ca4e6	4,575 B	A	view · diff
git:20260612.ec5e0c4	2026-06-12	ec5e0c4	4,562 B	A	view · diff
git:20260610.de062df	2026-06-10	de062df	4,599 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (8389 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

GitHub

majiayu000/spellbook · 288 stars · license MIT · pushed 2026-10-08 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_hbe3ela7oir5io3s
GET https://markdownregistry.com/api/v1/resolve?ref=majiayu000/spellbook/codex
GET https://markdownregistry.com/api/v1/blob/1175535f7b1fba37df3e9ce29c3895a47cffec1090dd0bcfe56ed91f50b2f028

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.

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