ChatGPT Codex CLI OpenAI Skill

skill-installer

Install Codex skills into $CODEX_HOME/skills from a curated list or a GitHub repo path. Use when a user asks to list installable skills, install a curated skill, or install a skill from another repo (including private repos).

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Download openai-skills-skills_.system_skill-installer-49f948f.zip · 12 KB
openai/skills 27348 1830 forks Updated 15d ago
Part of openai/skills — 44 skills

Install

skills CLI npx skills add https://github.com/openai/skills/tree/main/skills/.system/skill-installer
Claude Code claude plugin marketplace add https://llmmart.ai/marketplace.json && claude plugin install openai-skills@llmmart
Git git clone https://github.com/openai/skills.git

The skills CLI installs just this skill, for any of its supported agents. Claude Code installs the whole openai/skills collection as a plugin from our marketplace. Git is the plain clone.

Skill manifest

Skill Installer

Helps install skills. By default these are from https://github.com/openai/skills/tree/main/skills/.curated, but users can also provide other locations.

Use the helper scripts based on the task:

  • List skills when the user asks what is available, or if the user uses this skill without specifying what to do. Default listing is .curated, but you can pass --path skills/.experimental when they ask about experimental skills.
  • Install from the curated list when the user provides a skill name.
  • Install from another repo when the user provides a GitHub repo/path (including private repos).

Install skills with the helper scripts.

Communication

When listing skills, output approximately as follows, depending on the context of the user's request. If they ask about experimental skills, list from .experimental instead of .curated and label the source accordingly: """ Skills from :

  1. skill-1
  2. skill-2 (already installed)
  3. ... Which ones would you like installed? """

After installing a skill, tell the user it will be available on their next turn.

Scripts

All of these scripts use network, so when running in the sandbox, request escalation when running them.

  • scripts/list-skills.py (prints skills list with installed annotations)
  • scripts/list-skills.py --format json
  • Example (experimental list): scripts/list-skills.py --path skills/.experimental
  • scripts/install-skill-from-github.py --repo <owner>/<repo> --path <path/to/skill> [<path/to/skill> ...]
  • scripts/install-skill-from-github.py --url https://github.com/<owner>/<repo>/tree/<ref>/<path>
  • Example (experimental skill): scripts/install-skill-from-github.py --repo openai/skills --path skills/.experimental/<skill-name>

Behavior and Options

  • Defaults to direct download for public GitHub repos.
  • If download fails with auth/permission errors, falls back to git sparse checkout.
  • Aborts if the destination skill directory already exists.
  • Installs into $CODEX_HOME/skills/<skill-name> (defaults to ~/.codex/skills).
  • Multiple --path values install multiple skills in one run, each named from the path basename unless --name is supplied.
  • Options: --ref <ref> (default main), --dest <path>, --method auto|download|git.

Notes

  • Curated listing is fetched from https://github.com/openai/skills/tree/main/skills/.curated via the GitHub API. If it is unavailable, explain the error and exit.
  • Private GitHub repos can be accessed via existing git credentials or optional GITHUB_TOKEN/GH_TOKEN for download.
  • Git fallback tries HTTPS first, then SSH.
  • The skills at https://github.com/openai/skills/tree/main/skills/.system are preinstalled, so no need to help users install those. If they ask, just explain this. If they insist, you can download and overwrite.
  • Installed annotations come from $CODEX_HOME/skills.
Files (skills)
  • agents
    • openai.yaml 221 B 
      interface:
  display_name: "Skill Installer"
  short_description: "Install curated skills from openai/skills or other repos"
  icon_small: "./assets/skill-installer-small.svg"
  icon_large: "./assets/skill-installer.png"
  • assets
    • skill-installer-small.svg 923 B · in bundle
    • skill-installer.png 1 KB · in bundle
  • scripts
    • github_utils.py 659 B 
      #!/usr/bin/env python3
"""Shared GitHub helpers for skill install scripts."""

from __future__ import annotations

import os
import urllib.request


def github_request(url: str, user_agent: str) -> bytes:
    headers = {"User-Agent": user_agent}
    token = os.environ.get("GITHUB_TOKEN") or os.environ.get("GH_TOKEN")
    if token:
        headers["Authorization"] = f"token {token}"
    req = urllib.request.Request(url, headers=headers)
    with urllib.request.urlopen(req) as resp:
        return resp.read()


def github_api_contents_url(repo: str, path: str, ref: str) -> str:
    return f"https://api.github.com/repos/{repo}/contents/{path}?ref={ref}"
    • install-skill-from-github.py 9.9 KB 
      #!/usr/bin/env python3
"""Install a skill from a GitHub repo path into $CODEX_HOME/skills."""

from __future__ import annotations

import argparse
from dataclasses import dataclass
import os
import shutil
import subprocess
import sys
import tempfile
import urllib.error
import urllib.parse
import zipfile

from github_utils import github_request
DEFAULT_REF = "main"


@dataclass
class Args:
    url: str | None = None
    repo: str | None = None
    path: list[str] | None = None
    ref: str = DEFAULT_REF
    dest: str | None = None
    name: str | None = None
    method: str = "auto"


@dataclass
class Source:
    owner: str
    repo: str
    ref: str
    paths: list[str]
    repo_url: str | None = None


class InstallError(Exception):
    pass


def _codex_home() -> str:
    return os.environ.get("CODEX_HOME", os.path.expanduser("~/.codex"))


def _tmp_root() -> str:
    base = os.path.join(tempfile.gettempdir(), "codex")
    os.makedirs(base, exist_ok=True)
    return base


def _request(url: str) -> bytes:
    return github_request(url, "codex-skill-install")


def _parse_github_url(url: str, default_ref: str) -> tuple[str, str, str, str | None]:
    parsed = urllib.parse.urlparse(url)
    if parsed.netloc != "github.com":
        raise InstallError("Only GitHub URLs are supported for download mode.")
    parts = [p for p in parsed.path.split("/") if p]
    if len(parts) < 2:
        raise InstallError("Invalid GitHub URL.")
    owner, repo = parts[0], parts[1]
    ref = default_ref
    subpath = ""
    if len(parts) > 2:
        if parts[2] in ("tree", "blob"):
            if len(parts) < 4:
                raise InstallError("GitHub URL missing ref or path.")
            ref = parts[3]
            subpath = "/".join(parts[4:])
        else:
            subpath = "/".join(parts[2:])
    return owner, repo, ref, subpath or None


def _download_repo_zip(owner: str, repo: str, ref: str, dest_dir: str) -> str:
    zip_url = f"https://codeload.github.com/{owner}/{repo}/zip/{ref}"
    zip_path = os.path.join(dest_dir, "repo.zip")
    try:
        payload = _request(zip_url)
    except urllib.error.HTTPError as exc:
        raise InstallError(f"Download failed: HTTP {exc.code}") from exc
    with open(zip_path, "wb") as file_handle:
        file_handle.write(payload)
    with zipfile.ZipFile(zip_path, "r") as zip_file:
        _safe_extract_zip(zip_file, dest_dir)
        top_levels = {name.split("/")[0] for name in zip_file.namelist() if name}
    if not top_levels:
        raise InstallError("Downloaded archive was empty.")
    if len(top_levels) != 1:
        raise InstallError("Unexpected archive layout.")
    return os.path.join(dest_dir, next(iter(top_levels)))


def _run_git(args: list[str]) -> None:
    result = subprocess.run(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)
    if result.returncode != 0:
        raise InstallError(result.stderr.strip() or "Git command failed.")


def _safe_extract_zip(zip_file: zipfile.ZipFile, dest_dir: str) -> None:
    dest_root = os.path.realpath(dest_dir)
    for info in zip_file.infolist():
        extracted_path = os.path.realpath(os.path.join(dest_dir, info.filename))
        if extracted_path == dest_root or extracted_path.startswith(dest_root + os.sep):
            continue
        raise InstallError("Archive contains files outside the destination.")
    zip_file.extractall(dest_dir)


def _validate_relative_path(path: str) -> None:
    if os.path.isabs(path) or os.path.normpath(path).startswith(".."):
        raise InstallError("Skill path must be a relative path inside the repo.")


def _validate_skill_name(name: str) -> None:
    altsep = os.path.altsep
    if not name or os.path.sep in name or (altsep and altsep in name):
        raise InstallError("Skill name must be a single path segment.")
    if name in (".", ".."):
        raise InstallError("Invalid skill name.")


def _git_sparse_checkout(repo_url: str, ref: str, paths: list[str], dest_dir: str) -> str:
    repo_dir = os.path.join(dest_dir, "repo")
    clone_cmd = [
        "git",
        "clone",
        "--filter=blob:none",
        "--depth",
        "1",
        "--sparse",
        "--single-branch",
        "--branch",
        ref,
        repo_url,
        repo_dir,
    ]
    try:
        _run_git(clone_cmd)
    except InstallError:
        _run_git(
            [
                "git",
                "clone",
                "--filter=blob:none",
                "--depth",
                "1",
                "--sparse",
                "--single-branch",
                repo_url,
                repo_dir,
            ]
        )
    _run_git(["git", "-C", repo_dir, "sparse-checkout", "set", *paths])
    _run_git(["git", "-C", repo_dir, "checkout", ref])
    return repo_dir


def _validate_skill(path: str) -> None:
    if not os.path.isdir(path):
        raise InstallError(f"Skill path not found: {path}")
    skill_md = os.path.join(path, "SKILL.md")
    if not os.path.isfile(skill_md):
        raise InstallError("SKILL.md not found in selected skill directory.")


def _copy_skill(src: str, dest_dir: str) -> None:
    os.makedirs(os.path.dirname(dest_dir), exist_ok=True)
    if os.path.exists(dest_dir):
        raise InstallError(f"Destination already exists: {dest_dir}")
    shutil.copytree(src, dest_dir)


def _build_repo_url(owner: str, repo: str) -> str:
    return f"https://github.com/{owner}/{repo}.git"


def _build_repo_ssh(owner: str, repo: str) -> str:
    return f"git@github.com:{owner}/{repo}.git"


def _prepare_repo(source: Source, method: str, tmp_dir: str) -> str:
    if method in ("download", "auto"):
        try:
            return _download_repo_zip(source.owner, source.repo, source.ref, tmp_dir)
        except InstallError as exc:
            if method == "download":
                raise
            err_msg = str(exc)
            if "HTTP 401" in err_msg or "HTTP 403" in err_msg or "HTTP 404" in err_msg:
                pass
            else:
                raise
    if method in ("git", "auto"):
        repo_url = source.repo_url or _build_repo_url(source.owner, source.repo)
        try:
            return _git_sparse_checkout(repo_url, source.ref, source.paths, tmp_dir)
        except InstallError:
            repo_url = _build_repo_ssh(source.owner, source.repo)
            return _git_sparse_checkout(repo_url, source.ref, source.paths, tmp_dir)
    raise InstallError("Unsupported method.")


def _resolve_source(args: Args) -> Source:
    if args.url:
        owner, repo, ref, url_path = _parse_github_url(args.url, args.ref)
        if args.path is not None:
            paths = list(args.path)
        elif url_path:
            paths = [url_path]
        else:
            paths = []
        if not paths:
            raise InstallError("Missing --path for GitHub URL.")
        return Source(owner=owner, repo=repo, ref=ref, paths=paths)

    if not args.repo:
        raise InstallError("Provide --repo or --url.")
    if "://" in args.repo:
        return _resolve_source(
            Args(url=args.repo, repo=None, path=args.path, ref=args.ref)
        )

    repo_parts = [p for p in args.repo.split("/") if p]
    if len(repo_parts) != 2:
        raise InstallError("--repo must be in owner/repo format.")
    if not args.path:
        raise InstallError("Missing --path for --repo.")
    paths = list(args.path)
    return Source(
        owner=repo_parts[0],
        repo=repo_parts[1],
        ref=args.ref,
        paths=paths,
    )


def _default_dest() -> str:
    return os.path.join(_codex_home(), "skills")


def _parse_args(argv: list[str]) -> Args:
    parser = argparse.ArgumentParser(description="Install a skill from GitHub.")
    parser.add_argument("--repo", help="owner/repo")
    parser.add_argument("--url", help="https://github.com/owner/repo[/tree/ref/path]")
    parser.add_argument(
        "--path",
        nargs="+",
        help="Path(s) to skill(s) inside repo",
    )
    parser.add_argument("--ref", default=DEFAULT_REF)
    parser.add_argument("--dest", help="Destination skills directory")
    parser.add_argument(
        "--name", help="Destination skill name (defaults to basename of path)"
    )
    parser.add_argument(
        "--method",
        choices=["auto", "download", "git"],
        default="auto",
    )
    return parser.parse_args(argv, namespace=Args())


def main(argv: list[str]) -> int:
    args = _parse_args(argv)
    try:
        source = _resolve_source(args)
        source.ref = source.ref or args.ref
        if not source.paths:
            raise InstallError("No skill paths provided.")
        for path in source.paths:
            _validate_relative_path(path)
        dest_root = args.dest or _default_dest()
        tmp_dir = tempfile.mkdtemp(prefix="skill-install-", dir=_tmp_root())
        try:
            repo_root = _prepare_repo(source, args.method, tmp_dir)
            installed = []
            for path in source.paths:
                skill_name = args.name if len(source.paths) == 1 else None
                skill_name = skill_name or os.path.basename(path.rstrip("/"))
                _validate_skill_name(skill_name)
                if not skill_name:
                    raise InstallError("Unable to derive skill name.")
                dest_dir = os.path.join(dest_root, skill_name)
                if os.path.exists(dest_dir):
                    raise InstallError(f"Destination already exists: {dest_dir}")
                skill_src = os.path.join(repo_root, path)
                _validate_skill(skill_src)
                _copy_skill(skill_src, dest_dir)
                installed.append((skill_name, dest_dir))
        finally:
            if os.path.isdir(tmp_dir):
                shutil.rmtree(tmp_dir, ignore_errors=True)
        for skill_name, dest_dir in installed:
            print(f"Installed {skill_name} to {dest_dir}")
        return 0
    except InstallError as exc:
        print(f"Error: {exc}", file=sys.stderr)
        return 1


if __name__ == "__main__":
    raise SystemExit(main(sys.argv[1:]))
    • list-skills.py 2.9 KB 
      #!/usr/bin/env python3
"""List skills from a GitHub repo path."""

from __future__ import annotations

import argparse
import json
import os
import sys
import urllib.error

from github_utils import github_api_contents_url, github_request

DEFAULT_REPO = "openai/skills"
DEFAULT_PATH = "skills/.curated"
DEFAULT_REF = "main"


class ListError(Exception):
    pass


class Args(argparse.Namespace):
    repo: str
    path: str
    ref: str
    format: str


def _request(url: str) -> bytes:
    return github_request(url, "codex-skill-list")


def _codex_home() -> str:
    return os.environ.get("CODEX_HOME", os.path.expanduser("~/.codex"))


def _installed_skills() -> set[str]:
    root = os.path.join(_codex_home(), "skills")
    if not os.path.isdir(root):
        return set()
    entries = set()
    for name in os.listdir(root):
        path = os.path.join(root, name)
        if os.path.isdir(path):
            entries.add(name)
    return entries


def _list_skills(repo: str, path: str, ref: str) -> list[str]:
    api_url = github_api_contents_url(repo, path, ref)
    try:
        payload = _request(api_url)
    except urllib.error.HTTPError as exc:
        if exc.code == 404:
            raise ListError(
                "Skills path not found: "
                f"https://github.com/{repo}/tree/{ref}/{path}"
            ) from exc
        raise ListError(f"Failed to fetch skills: HTTP {exc.code}") from exc
    data = json.loads(payload.decode("utf-8"))
    if not isinstance(data, list):
        raise ListError("Unexpected skills listing response.")
    skills = [item["name"] for item in data if item.get("type") == "dir"]
    return sorted(skills)


def _parse_args(argv: list[str]) -> Args:
    parser = argparse.ArgumentParser(description="List skills.")
    parser.add_argument("--repo", default=DEFAULT_REPO)
    parser.add_argument(
        "--path",
        default=DEFAULT_PATH,
        help="Repo path to list (default: skills/.curated)",
    )
    parser.add_argument("--ref", default=DEFAULT_REF)
    parser.add_argument(
        "--format",
        choices=["text", "json"],
        default="text",
        help="Output format",
    )
    return parser.parse_args(argv, namespace=Args())


def main(argv: list[str]) -> int:
    args = _parse_args(argv)
    try:
        skills = _list_skills(args.repo, args.path, args.ref)
        installed = _installed_skills()
        if args.format == "json":
            payload = [
                {"name": name, "installed": name in installed} for name in skills
            ]
            print(json.dumps(payload))
        else:
            for idx, name in enumerate(skills, start=1):
                suffix = " (already installed)" if name in installed else ""
                print(f"{idx}. {name}{suffix}")
        return 0
    except ListError as exc:
        print(f"Error: {exc}", file=sys.stderr)
        return 1


if __name__ == "__main__":
    raise SystemExit(main(sys.argv[1:]))
  • LICENSE.txt 11.1 KB 
    
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  • SKILL.md 3.2 KB 
    ---
name: skill-installer
description: Install Codex skills into $CODEX_HOME/skills from a curated list or a GitHub repo path. Use when a user asks to list installable skills, install a curated skill, or install a skill from another repo (including private repos).
metadata:
  short-description: Install curated skills from openai/skills or other repos
---

# Skill Installer

Helps install skills. By default these are from https://github.com/openai/skills/tree/main/skills/.curated, but users can also provide other locations.

Use the helper scripts based on the task:
- List skills when the user asks what is available, or if the user uses this skill without specifying what to do. Default listing is `.curated`, but you can pass `--path skills/.experimental` when they ask about experimental skills.
- Install from the curated list when the user provides a skill name.
- Install from another repo when the user provides a GitHub repo/path (including private repos).

Install skills with the helper scripts.

## Communication

When listing skills, output approximately as follows, depending on the context of the user's request. If they ask about experimental skills, list from `.experimental` instead of `.curated` and label the source accordingly:
"""
Skills from {repo}:
1. skill-1
2. skill-2 (already installed)
3. ...
Which ones would you like installed?
"""

After installing a skill, tell the user it will be available on their next turn.

## Scripts

All of these scripts use network, so when running in the sandbox, request escalation when running them.

- `scripts/list-skills.py` (prints skills list with installed annotations)
- `scripts/list-skills.py --format json`
- Example (experimental list): `scripts/list-skills.py --path skills/.experimental`
- `scripts/install-skill-from-github.py --repo <owner>/<repo> --path <path/to/skill> [<path/to/skill> ...]`
- `scripts/install-skill-from-github.py --url https://github.com/<owner>/<repo>/tree/<ref>/<path>`
- Example (experimental skill): `scripts/install-skill-from-github.py --repo openai/skills --path skills/.experimental/<skill-name>`

## Behavior and Options

- Defaults to direct download for public GitHub repos.
- If download fails with auth/permission errors, falls back to git sparse checkout.
- Aborts if the destination skill directory already exists.
- Installs into `$CODEX_HOME/skills/<skill-name>` (defaults to `~/.codex/skills`).
- Multiple `--path` values install multiple skills in one run, each named from the path basename unless `--name` is supplied.
- Options: `--ref <ref>` (default `main`), `--dest <path>`, `--method auto|download|git`.

## Notes

- Curated listing is fetched from `https://github.com/openai/skills/tree/main/skills/.curated` via the GitHub API. If it is unavailable, explain the error and exit.
- Private GitHub repos can be accessed via existing git credentials or optional `GITHUB_TOKEN`/`GH_TOKEN` for download.
- Git fallback tries HTTPS first, then SSH.
- The skills at https://github.com/openai/skills/tree/main/skills/.system are preinstalled, so no need to help users install those. If they ask, just explain this. If they insist, you can download and overwrite.
- Installed annotations come from `$CODEX_HOME/skills`.

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