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
## Running a Task
1. **Do NOT specify a model by default.** The Codex CLI is configured with a ChatGPT account, and explicit model flags (`-m gpt-5-codex`, `-m gpt-5`, `-m o4-mini`) all fail with "not supported when using Codex with a ChatGPT account." Omitting `-m` lets Codex use its default model, which works. Only add `-m` if the user explicitly requests a specific model.
2. Select the sandbox mode required for the task; default to `--sandbox read-only` unless edits or network access are necessary.
3. Assemble the command with the appropriate options:
- `--sandbox <read-only|workspace-write|danger-full-access>`
- `--full-auto`
- `-C, --cd <DIR>`
- `--skip-git-repo-check`
- `-m, --model <MODEL>` (only if user explicitly requests)
- `--config model_reasoning_effort="<high|medium|low>"` (only if user explicitly requests)
4. Always use --skip-git-repo-check.
…
The line at the top of this page pins the label git:20260507.0dd446f, 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.
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 (3531 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
glebis/claude-skills · 410 stars · license MIT · pushed 2026-11-05 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_hkixwd4dqmrp2p3y
GET https://markdownregistry.com/api/v1/resolve?ref=glebis/claude-skills/codex
GET https://markdownregistry.com/api/v1/blob/64b128d6db5c22788bc76d4e4653c9886429ec3f83e0c2bf5b24fe27165fbe11
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.
glebis/claude-skills · agency-socials/SKILL.md · Generate social media covers and assets for AGENCY Community events, meetups, and YouTube recordings. Use when creating…
glebis/claude-skills · agent-cli/SKILL.md · Add agent-friendly --json NDJSON output to Python CLI scripts, or scaffold a complete cli_utils package for a project…
glebis/claude-skills · agent-roundtable/SKILL.md · Run a multi-agent audit of a feature, PR/diff, or task spec in which Codex, Command Code (cmd), Gemini, OpenCode and…
glebis/claude-skills · app-map/SKILL.md · This skill should be used when mapping an application's screens, workflows and tests into one interactive page. It…
glebis/claude-skills · app-release/SKILL.md · End-to-end pipeline for releasing an iOS / watchOS app to TestFlight and the App Store. Use when the user wants to…
glebis/claude-skills · automation-advisor/SKILL.md · Interactive automation decision advisor using the Automation Decision Matrix framework. Use when the user asks "should…
glebis/claude-skills · background-agents/SKILL.md · Configure and run background agents with reusable profiles for agent engines, model providers and execution backends…
glebis/claude-skills · balanced/SKILL.md · Constructive, evidence-based dialogue mode that avoids sycophancy. This skill should be used when the user wants…
glebis/claude-skills · brand-agency/SKILL.md · Applies Agency brand colors and typography to artifacts including presentations, SVG graphics, documents, and web…
dzhng/skills · skills/engineering/codex/SKILL.md · Use the local Codex CLI as an independent second agent. Two branches — (1) proactively run `codex review` for a second…
giuseppe-trisciuoglio/developer-kit · plugins/developer-kit-tools/skills/codex/SKILL.md · Provides Codex CLI delegation workflows for complex code generation and development tasks using OpenAI's GPT-5.3-codex…
majiayu000/spellbook · skills/codex/SKILL.md · Use when the user asks to run Codex CLI (codex exec, codex resume) or references OpenAI Codex for code analysis…
dzhng/duet-agent · .agents/skills/codex/SKILL.md · Use the local Codex CLI as an independent second agent. Two branches — (1) proactively run `codex review` for a second…
