codex SKILL.md skillA
codex from dzhng/duet-agent is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add dzhng/duet-agent/codex@git:20261020.37d28d9Pins git:20261020.37d28d9 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- dzhng/duet-agent
- Path
.agents/skills/codex/SKILL.md- Versions recorded
- 4
- Latest version
- git:20261020.37d28d9, committed Oct 20, 2026
- First version recorded
- Jul 17, 2026
- Size
- 10,187 bytes
- Repository stars
- 50
- License
- Apache-2.0
Use the local Codex CLI as an independent second agent. Two branches — (1) proactively run `codex review` for a second opinion after completing a substantive change, before presenting it as done or committing; (2) delegate a well-defined implementation task via `codex exec`, ONLY when the user explicitly asks for Codex to do it. Also covers how to prompt Codex.
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 Codex is an independent agent on PATH (`codex` — invoke as `command codex` if a shell alias shadows it), sharing this working tree and already authenticated. It is a second opinion, not ground truth: verify what it reports, own what it changes. It reads the same skills your repo carries. Leave Codex's model at its CLI default unless the user asks for a specific one. The default follows the current Codex release; do not pin a dated model ID in this skill. If an explicit override is needed, verify it is current and pass the requested model with `-m <model>`. ## If `codex` is not installed When `codex` is missing from PATH, offer to install it — **ask the user for approval first**, never install on your own initiative. On yes, follow the current instructions at https://developers.openai.com/codex/cli. First-run authentication is interactive — hand that step to the user. Verify with `codex --version` before proceeding. ## Prompting Codex Prompt Codex like an operator, not a collaborator: compact, block-structured with XML tags. State the task, what "done" looks like, and the few constraints that matter. A tighter prompt beats a bigger run — improve the contract before …
Read the whole file at its exact version.
How to install
mdr add dzhng/duet-agent/codex@sha256:34ac6ea1d7aa57a8The line at the top of this page pins the label git:20261020.37d28d9, 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_wvgetsc7leg7xr4q)
5 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 4 versions of this file, between Jul 17, 2026 and Oct 20, 2026, about one every 32 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261020.37d28d9 latest | 2026-10-20 | 37d28d9 | 10,187 B | A | view · diff |
| git:20261015.0e6cd08 | 2026-10-15 | 0e6cd08 | 10,197 B | A | view · diff |
| git:20261012.28d8777 | 2026-10-12 | 28d8777 | 9,813 B | A | view · diff |
| git:20260717.934babf | 2026-07-17 | 934babf | 8,746 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 (10187 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
dzhng/duet-agent · 50 stars · license Apache-2.0 · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_wvgetsc7leg7xr4q GET https://markdownregistry.com/api/v1/resolve?ref=dzhng/duet-agent/codex GET https://markdownregistry.com/api/v1/blob/34ac6ea1d7aa57a8752ef6c796e6285b6a9564126a8837896d39ed0fc1c1add6
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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