MCP Integration for Plugins
anthropics/claude-plugins-official
Explains how to bundle Model Context Protocol servers in a Claude Code plugin, covering config files, stdio, SSE, HTTP and WebSocket server types, and authentication.
Official agent skill
Build Codex Native Plugins
by callstackincubator in callstackincubator/codex-mobile-dev-plugin
Create, extend, package, and troubleshoot Codex and ChatGPT plugins using OpenAI MCP Extensions.
Install Build Codex Native Plugins
$ npx skills add callstackincubator/codex-mobile-dev-plugin --skill build-codex-native-plugins -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install callstackincubator/codex-mobile-dev-plugin build-codex-native-plugins --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/callstackincubator/codex-mobile-dev-plugin.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/build-codex-native-plugins .claude/skills/build-codex-native-plugins && 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 "build-codex-native-plugins" agent skill from https://github.com/callstackincubator/codex-mobile-dev-plugin/tree/main/skills/build-codex-native-plugins into .claude/skills/build-codex-native-plugins/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "build-codex-native-plugins", 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/callstackincubator/codex-mobile-dev-plugin/tree/main/skills/build-codex-native-pluginsType 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 callstackincubator/codex-mobile-dev-plugin --skill build-codex-native-plugins -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install callstackincubator/codex-mobile-dev-plugin build-codex-native-plugins --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/callstackincubator/codex-mobile-dev-plugin.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/build-codex-native-plugins .agents/skills/build-codex-native-plugins && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "build-codex-native-plugins" agent skill from https://github.com/callstackincubator/codex-mobile-dev-plugin/tree/main/skills/build-codex-native-plugins into .agents/skills/build-codex-native-plugins/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "build-codex-native-plugins", 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 callstackincubator/codex-mobile-dev-plugin --skill build-codex-native-plugins -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install callstackincubator/codex-mobile-dev-plugin build-codex-native-plugins --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/callstackincubator/codex-mobile-dev-plugin.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/build-codex-native-plugins .cursor/skills/build-codex-native-plugins && 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 "build-codex-native-plugins" agent skill from https://github.com/callstackincubator/codex-mobile-dev-plugin/tree/main/skills/build-codex-native-plugins into .cursor/skills/build-codex-native-plugins/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "build-codex-native-plugins", 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/callstackincubator/codex-mobile-dev-plugin.git --path skills/build-codex-native-plugins--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 callstackincubator/codex-mobile-dev-plugin --skill build-codex-native-plugins -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install callstackincubator/codex-mobile-dev-plugin build-codex-native-plugins --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/callstackincubator/codex-mobile-dev-plugin.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/build-codex-native-plugins .gemini/skills/build-codex-native-plugins && 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 "build-codex-native-plugins" agent skill from https://github.com/callstackincubator/codex-mobile-dev-plugin/tree/main/skills/build-codex-native-plugins into .gemini/skills/build-codex-native-plugins/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "build-codex-native-plugins", 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 callstackincubator/codex-mobile-dev-plugin build-codex-native-pluginsInstalls 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 callstackincubator/codex-mobile-dev-plugin --skill build-codex-native-plugins -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/callstackincubator/codex-mobile-dev-plugin.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/build-codex-native-plugins .github/skills/build-codex-native-plugins && 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 "build-codex-native-plugins" agent skill from https://github.com/callstackincubator/codex-mobile-dev-plugin/tree/main/skills/build-codex-native-plugins into .github/skills/build-codex-native-plugins/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "build-codex-native-plugins", 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 callstackincubator/codex-mobile-dev-plugin --skill build-codex-native-plugins -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install callstackincubator/codex-mobile-dev-plugin build-codex-native-plugins --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/callstackincubator/codex-mobile-dev-plugin.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/build-codex-native-plugins .opencode/skills/build-codex-native-plugins && 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 "build-codex-native-plugins" agent skill from https://github.com/callstackincubator/codex-mobile-dev-plugin/tree/main/skills/build-codex-native-plugins into .opencode/skills/build-codex-native-plugins/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "build-codex-native-plugins", 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
build-codex-native-plugins- GitHub stars
- 144
- Token cost
- ~1.9k tokens
- SKILL.md length
- 1,002 words
- Files
- 10 (incl. references)
- Skills in repo
- 4
- Repo updated
- First seen
- Licence
- None found
At a glance
Create, extend, package, and troubleshoot Codex and ChatGPT plugins using OpenAI MCP Extensions.
- Works in 9 steps: Define tools around user actions.… → Implement the server and make its… → Register the UI resource and the… → …
- Native sidebar apps
- SKILL.md covers Start with the actual host and…, Read the relevant reference, Keep package and protocol… and Build the workflow, plus 2 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Build Codex Native Plugins is an agent skill from callstackincubator/codex-mobile-dev-plugin, published by the product's own GitHub organization. Create, extend, package, and troubleshoot Codex and ChatGPT plugins using OpenAI MCP Extensions. Use for native sidebar apps, conversation panels, file viewers or editors, settings, composer mentions, rich forms, onboarding, and plugin marketplaces. Also covers MCP tools, authentication, bundled skills, events, and public submission.
Its SKILL.md is about 1.9k tokens, which your agent loads only when the skill is triggered. The skill folder holds 11 other files, including reference files (for example `agents/openai.yaml`, `references/events.md` and `references/files.md`).
It sits in Agent Workflows, covering MCP servers and Hooks and plugins. It works with OpenAI and Model Context Protocol. The repository describes itself as: A Codex plugin for a better mobile development experience for android and iOS.
When your agent uses it
- Native sidebar apps
- Conversation panels
- Composer mentions
- Plugin marketplaces
Example prompts
- “/build-codex-native-plugins”
Requirements
- Python 3
Workflow steps
9 steps, taken from the first numbered list in SKILL.md.
- Define tools around user actions. Specify inputs, structured results, account scope, side effects, and errors. Keep read and write actions…
- Implement the server and make its model-readable results useful before adding UI. A UI failure should not hide the tool's outcome.
- Register the UI resource and the entrypoint tools. Global and thread entrypoints must accept {}. Give file handlers their documented file…
- In the app, register initial tool input, result, and host-context handlers before connecting. Render the initial result without repeating…
- Add only the needed extensions. Preserve account isolation, scope checks, file version checks, and form cancellation behavior.
- Bundle runtime code, UI HTML, CSS, and assets. Check paths from the installed plugin root, including in a copied package that cannot use…
- Package the skill instructions and any setup skill. Connect onboarding with extensions.com.openai.onboardingSkill when the workflow needs…
- Add or update the intended marketplace without replacing its other entries. Refresh and install through the host's supported flow.
- Run permitted checks for the changed behavior. Test the server contract and installed workflow separately when the environment allows it…
What it can do on your machine
Read from SKILL.md and the folder at commit 60f9aa0. 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
No scripts in the folder and no shell commands in SKILL.md.
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 no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Build Codex Native Plugins loads about 1.9k tokens when it runs, and up to ~17k if it reads all its reference files. Until then it costs about 91 tokens; SKILL.md has 1,002 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 1,002 words (~1,899 tokens).
“Build an installable plugin whose tools and native UI complete the user's stated workflow. Use standard MCP and MCP Apps for the shared protocol, then add OpenAI MCP Extensions for the native features the workflow needs.”
- name
- build-codex-native-plugins
Files
SKILL.md and 9 other files (references) in skills/build-codex-native-plugins of callstackincubator/codex-mobile-dev-plugin.
- SKILL.md
- agents/openai.yaml
- references/events.md
- references/files.md
- references/mcp-server.md
- references/native-ui.md
- references/packaging.md
- references/settings-and-forms.md
- references/sources.md
- references/testing-and-release.md
Open the folder on GitHubat commit 60f9aa0
Compare with similar skills
Build Codex Native Plugins 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 |
|---|---|---|---|---|---|---|
| Build Codex Native Plugins this skillcallstackincubator/codex-mobile-dev-plugin | 144 | — | ~1.9k | Automated safety check: Pass | None | |
| MCP Integration for Pluginsanthropics/claude-plugins-official | 38k | 11 repos | ~3.1k | Automated safety check: Pass | Apache-2.0 | |
| Crush Configurationcharmbracelet/crush | 29k | — | ~3.7k | Automated safety check: Pass | Custom licence | |
| Codex with ChatGPT Planning LoopXiaoDuoYa/codex-with-chatgpt | 7.1k | — | ~11k | Automated safety check: Notes | MIT | |
| OpenpetsOpenPetsHQ/openpets | 1.3k | — | ~2.1k | Automated safety check: Pass | MIT | |
| Claude Automation Recommenderanthropics/claude-plugins-official | 38k | 3 repos | ~2.7k | Automated safety check: Notes | Apache-2.0 |
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Related
Works with
Categories
Questions about Build Codex Native Plugins
What does Build Codex Native Plugins do?
Create, extend, package, and troubleshoot Codex and ChatGPT plugins using OpenAI MCP Extensions. Build Codex Native Plugins is an agent skill from callstackincubator/codex-mobile-dev-plugin, published by the product's own GitHub organization. Create, extend, package, and troubleshoot Codex and ChatGPT plugins using OpenAI MCP Extensions.
When should I use Build Codex Native Plugins?
Build Codex Native Plugins fits situations like: native sidebar apps; conversation panels; composer mentions; plugin marketplaces.
How do I install Build Codex Native Plugins in Claude Code?
Run `npx skills add callstackincubator/codex-mobile-dev-plugin --skill build-codex-native-plugins -a claude-code`. Or copy the skill folder (skills/build-codex-native-plugins in callstackincubator/codex-mobile-dev-plugin) into .claude/skills/build-codex-native-plugins in your project. Claude Code loads it when a task matches its description.
How do I install Build Codex Native Plugins in Codex?
Run `npx skills add callstackincubator/codex-mobile-dev-plugin --skill build-codex-native-plugins -a codex`. Or copy the skill folder (skills/build-codex-native-plugins in callstackincubator/codex-mobile-dev-plugin) into .agents/skills/build-codex-native-plugins in your project. Codex loads it when a task matches its description.
Can I use Build Codex Native Plugins 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 callstackincubator/codex-mobile-dev-plugin --skill build-codex-native-plugins -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/build-codex-native-plugins, .gemini/skills/build-codex-native-plugins, .github/skills/build-codex-native-plugins and .opencode/skills/build-codex-native-plugins in your project.
What does Build Codex Native Plugins need to run?
SKILL.md names no scripts, command-line tools or credentials: Build Codex Native Plugins is instructions for the agent only. Our summary lists: Python 3.
Does Build Codex Native Plugins 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 Build Codex Native Plugins 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 Build Codex Native Plugins use?
No licence was found for Build Codex Native Plugins or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Build Codex Native Plugins use?
About 1.9k tokens (SKILL.md is roughly 7.6k 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 15k tokens, read only when the agent opens those files.
What are the alternatives to Build Codex Native Plugins?
Skills that share tags, products or a category with Build Codex Native Plugins: MCP Integration for Plugins (anthropics/claude-plugins-official, 38k stars), Crush Configuration (charmbracelet/crush, 29k stars), Codex with ChatGPT Planning Loop (XiaoDuoYa/codex-with-chatgpt, 7.1k stars) and Openpets (OpenPetsHQ/openpets, 1.3k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Build Codex Native Plugins?
callstackincubator (a GitHub organization, an official publisher) maintains it in callstackincubator/codex-mobile-dev-plugin, which has 144 GitHub stars. The repository holds 4 skills in this directory. The repository was last updated on October 7, 2026.
Source: callstackincubator/codex-mobile-dev-plugin on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.