codex-agent SKILL.md skillA
codex-agent 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-agent@git:20261007.a10192cPins 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-agent/SKILL.md- Versions recorded
- 6
- Latest version
- git:20261007.a10192c, committed Oct 7, 2026
- First version recorded
- Jan 15, 2026
- Size
- 7,685 bytes
- Repository stars
- 290
- License
- MIT
Use when you want a second-opinion review via Codex CLI, cross-verification after another agent implements changes, debugging help, or alternative implementation proposals. Requires Codex CLI to be installed and authenticated.
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 Agent Collaboration Skill This skill enables Claude Code to collaborate with OpenAI's Codex CLI agent for second-opinion review, cross-verification, debugging analysis, and alternative implementation proposals. Default posture: Codex reviews in `read-only`; the primary agent applies changes only when the user asked for fixes or approved them after reading the review. ## Optional Codex Review Workflow Use this workflow when the user asks for Codex review, wants a second opinion, or needs cross-verification from a separate coding agent. ### Step 1: Call Codex and Read Feedback ```bash REPORT="$(mktemp -t codex-review.XXXXXX.md)" codex exec -C <project_path> -s read-only -o "$REPORT" \ "Review the code in <file_or_directory>. Check for: - Security vulnerabilities - Performance issues - Code quality and best practices - Potential bugs and edge cases - Naming and readability Provide specific, actionable feedback with file paths and line numbers." cat "$REPORT" ``` Keep the write and read in the same Bash call, or pass a concrete report path between calls; shell variables do not persist across tool calls. …
Read the whole file at its exact version.
How to install
mdr add majiayu000/spellbook/codex-agent@sha256:87d56059c3da881aThe 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.
[](https://markdownregistry.com/a/art_l6xbebjf7w7a6abz)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 6 versions of this file, between Jan 15, 2026 and Oct 7, 2026, about one every 53 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261007.a10192c latest | 2026-10-07 | a10192c | 7,685 B | A | view · diff |
| git:20260619.9f35213 | 2026-06-19 | 9f35213 | 7,593 B | A | view · diff |
| git:20260610.de062df | 2026-06-10 | de062df | 7,552 B | A | view · diff |
| git:20260605.a09e45c | 2026-06-05 | a09e45c | 5,880 B | A | view · diff |
| git:20260530.1e1fca0 | 2026-05-30 | 1e1fca0 | 5,691 B | A | view · diff |
| git:20260115.112b20c | 2026-01-15 | 112b20c | 5,588 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 (7685 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_l6xbebjf7w7a6abz GET https://markdownregistry.com/api/v1/resolve?ref=majiayu000/spellbook/codex-agent GET https://markdownregistry.com/api/v1/blob/87d56059c3da881a176a4bf69d8f50f7e10c45d145bbad64cad639069e1b6c3a
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.