codex-playbook SKILL.md skillA
codex-playbook from gaia-research/gaia-skill-heaven is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add gaia-research/gaia-skill-heaven/codex-playbook@git:20260810.ae24947Pins git:20260810.ae24947 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- gaia-research/gaia-skill-heaven
- Path
packages/core/skills/codex-playbook/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260810.ae24947, committed Aug 10, 2026
- First version recorded
- Aug 8, 2026
- Size
- 7,113 bytes
- Repository stars
- 4
- License
- MIT
Drive the Codex CLI as a benchmark target or dispatched worker. Use when running codex probes, comparing codex postures, building codex-zero, or handing work to a codex agent. Covers non-interactive exec, sandbox and config isolation, model and reasoning-effort selection, and the per-session skills toggle.
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 Playbook `codex` is OpenAI's coding agent CLI. Its distinguishing feature for Skill Heaven is strong **isolation**: config, session persistence, and the writable filesystem are each independently suppressible from the command line, so a clean posture composes without mutating anything. Verified against **codex-cli 0.146.0**. Re-check `codex --version` before trusting any dose measurement. > **Rule 0 — run codex in a herdr pane, never through your Bash tool.** The operator must be > able to see which model and reasoning effort you invoked. A probe the operator could not see is > not evidence. Use `pane send-text` with a trailing newline **inside** the quotes — **not** > `pane run`, which splits argv on whitespace and destroys quoted prompts: > > ```bash > herdr pane send-text "$PROBE_PANE" 'codex exec --model gpt-5.6-luna -c model_reasoning_effort=low "probe text" > ' > herdr pane read "$PROBE_PANE" > ``` > **Building the door?** Read `packages/core/skills/harness-door-pattern/SKILL.md` first — it > carries the suppression-mechanism taxonomy, the probe methodology, and the traps. This playbook > is the harness-specific detail underneath it. --- …
Read the whole file at its exact version.
How to install
mdr add gaia-research/gaia-skill-heaven/codex-playbook@sha256:2b6becb9fd2f695dThe line at the top of this page pins the label git:20260810.ae24947, 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_kghjjggtyy6oxpwk)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Aug 8, 2026 and Aug 10, 2026, about one every 2 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260810.ae24947 latest | 2026-08-10 | ae24947 | 7,113 B | A | view · diff |
| git:20260808.44f0e9d | 2026-08-08 | 44f0e9d | 7,121 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 (7113 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
gaia-research/gaia-skill-heaven · 4 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_kghjjggtyy6oxpwk GET https://markdownregistry.com/api/v1/resolve?ref=gaia-research/gaia-skill-heaven/codex-playbook GET https://markdownregistry.com/api/v1/blob/2b6becb9fd2f695dc6ce67cf62b867015a592941ebdbf6531c2a210f09a21596
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.