Azure AI Projects Python SDK
microsoft/skills
Reference for building on Microsoft Foundry with the azure-ai-projects Python SDK: project clients, versioned agents, evaluations, connections, datasets and indexes.
Run OpenAI's Codex CLI agent in non-interactive mode using codex exec.
Install Codex
$ npx skills add sundial-org/skills --skill codex -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install sundial-org/skills codex --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/sundial-org/skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/codex .claude/skills/codex && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "codex" agent skill from https://github.com/sundial-org/skills/tree/main/skills/codex into .claude/skills/codex/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "codex", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/sundial-org/skills/tree/main/skills/codexType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add sundial-org/skills --skill codex -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install sundial-org/skills codex --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sundial-org/skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/codex .agents/skills/codex && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "codex" agent skill from https://github.com/sundial-org/skills/tree/main/skills/codex into .agents/skills/codex/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "codex", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add sundial-org/skills --skill codex -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install sundial-org/skills codex --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sundial-org/skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/codex .cursor/skills/codex && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "codex" agent skill from https://github.com/sundial-org/skills/tree/main/skills/codex into .cursor/skills/codex/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "codex", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/sundial-org/skills.git --path skills/codex--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add sundial-org/skills --skill codex -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install sundial-org/skills codex --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sundial-org/skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/codex .gemini/skills/codex && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "codex" agent skill from https://github.com/sundial-org/skills/tree/main/skills/codex into .gemini/skills/codex/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "codex", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install sundial-org/skills codexInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add sundial-org/skills --skill codex -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/sundial-org/skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/codex .github/skills/codex && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "codex" agent skill from https://github.com/sundial-org/skills/tree/main/skills/codex into .github/skills/codex/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "codex", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add sundial-org/skills --skill codex -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install sundial-org/skills codex --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sundial-org/skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/codex .opencode/skills/codex && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "codex" agent skill from https://github.com/sundial-org/skills/tree/main/skills/codex into .opencode/skills/codex/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "codex", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
codex- GitHub stars
- 152
- Token cost
- ~1.5k tokens
- SKILL.md length
- 441 words
- Files
- 3 (incl. references)
- Skills in repo
- 13
- Repo updated
- First seen
- Licence
- None found
At a glance
Run OpenAI's Codex CLI agent in non-interactive mode using codex exec.
- Delegating coding tasks to Codex
- SKILL.md covers When to Use Codex, Quick Reference, Core Concepts and Code Review, plus 7 more sections
- Calls codex and jq; needs CODEX_API_KEY
- Running Codex in scripts/automation
What it does
Codex is an agent skill from sundial-org/skills. Run OpenAI's Codex CLI agent in non-interactive mode using codex exec. Use when delegating coding tasks to Codex, running Codex in scripts/automation, or when needing a second agent to work on a task in parallel.
Its SKILL.md is about 1.5k tokens, which your agent loads only when the skill is triggered. The skill folder holds 3 other files, including reference files (for example `references/exec-reference.md` and `references/prompting.md`).
It sits in AI & LLM Engineering. It works with OpenAI. The repository describes itself as: Claude Code Skills by Sundial.
When your agent uses it
- Delegating coding tasks to Codex
- Running Codex in scripts/automation
- Needing a second agent to work on a task in parallel
Example prompts
- “/codex”
Requirements
- A credential in CODEX_API_KEY
What it can do on your machine
Read from SKILL.md and the folder at commit 5a3bf9f. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
codexjq
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names these keys or tokens, usually read from environment variables:
CODEX_API_KEY
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Codex loads about 1.5k tokens when it runs, and up to ~4.2k if it reads all its reference files. Until then it costs about 55 tokens; SKILL.md has 441 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Without a licence we can't republish the file, so here is its outline and opening line. It has 441 words (~1,516 tokens).
“Codex is OpenAI's coding agent. Use codex exec to run it non-interactively from any cli agent.”
- name
- codex
Files
SKILL.md and 2 other files (references) in skills/codex of sundial-org/skills.
- SKILL.md
- references/exec-reference.md
- references/prompting.md
Open the folder on GitHubat commit 5a3bf9f
Compare with similar skills
Codex next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Codex this skillsundial-org/skills | 152 | — | ~1.5k | Automated safety check: Pass | None | |
| Azure AI Projects Python SDKmicrosoft/skills | 3.1k | 6 repos | ~2.8k | Automated safety check: Pass | MIT | |
| Perfupraullenchai/Rapid-MLX | 3.9k | — | ~1.6k | Automated safety check: Notes | Custom licence | |
| Cursor BYOK Prefix Stabilityleookun/cursor-byok | 3.2k | — | ~1.3k | Automated safety check: Pass | MIT | |
| Visionxiincs/claude-code-vision-skill | 170 | — | ~1.2k | Automated safety check: Pass | MIT | |
| Instructor Structured LLM OutputsOrchestra-Research/AI-Research-SKILLs | 13k | 7 repos | ~4.2k | Automated safety check: Pass | MIT |
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- Official
Perfup
raullenchai/Rapid-MLX
Autonomous performance optimization: research, PoC, benchmark, implement, review, PR
Cursor BYOK Prefix Stability
leookun/cursor-byok
Guides changes to the cursor-byok server so provider conversation history stays append-only and each turn's history remains an exact prefix of the next, protecting prefix caches.
Vision
xiincs/claude-code-vision-skill
Call vision models (Doubao, Qwen, DeepSeek, OpenAI) to analyze images.
Instructor Structured LLM Outputs
Orchestra-Research/AI-Research-SKILLs
Shows how to pull validated, typed data out of LLM responses with Instructor and Pydantic models, including retries on failure and partial streaming.
- Official
Building Multi Connector Agent
airbytehq/airbyte-agent-sdk
Builds a complete agent with multiple Airbyte connectors using PydanticAI or Claude SDK.
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Related
Works with
Categories
Questions about Codex
What does Codex do?
Run OpenAI's Codex CLI agent in non-interactive mode using codex exec. Codex is an agent skill from sundial-org/skills. Run OpenAI's Codex CLI agent in non-interactive mode using codex exec.
When should I use Codex?
Codex fits situations like: delegating coding tasks to Codex; running Codex in scripts/automation; needing a second agent to work on a task in parallel.
How do I install Codex in Claude Code?
Run `npx skills add sundial-org/skills --skill codex -a claude-code`. Or copy the skill folder (skills/codex in sundial-org/skills) into .claude/skills/codex in your project. Claude Code loads it when a task matches its description.
How do I install Codex in Codex?
Run `npx skills add sundial-org/skills --skill codex -a codex`. Or copy the skill folder (skills/codex in sundial-org/skills) into .agents/skills/codex in your project. Codex loads it when a task matches its description.
Can I use Codex in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add sundial-org/skills --skill codex -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/codex, .gemini/skills/codex, .github/skills/codex and .opencode/skills/codex in your project.
What does Codex need to run?
Going by SKILL.md and its folder, Codex needs the command-line tools its instructions call (codex and jq) and credentials named CODEX_API_KEY. Our summary lists: A credential in CODEX_API_KEY.
Does Codex access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Codex safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Codex use?
No licence was found for Codex or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Codex use?
About 1.5k tokens (SKILL.md is roughly 6.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 2.7k tokens, read only when the agent opens those files.
What are the alternatives to Codex?
Skills that share tags, products or a category with Codex: Azure AI Projects Python SDK (microsoft/skills, 3.1k stars), Perfup (raullenchai/Rapid-MLX, 3.9k stars), Cursor BYOK Prefix Stability (leookun/cursor-byok, 3.2k stars) and Vision (xiincs/claude-code-vision-skill, 170 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Codex?
sundial-org (a GitHub organization) maintains it in sundial-org/skills, which has 152 GitHub stars. The repository holds 13 skills in this directory. The repository was last updated on July 15, 2026.
Source: sundial-org/skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.