Install agent skills and plugins in Claude, Codex, and Cursor
Pick your app. Coding agents install plugins from this marketplace. ChatGPT and Claude.ai take a skill ZIP.
Add this marketplace to Claude Code
Add this marketplace once, then install each plugin by name. The terminal and desktop app share it.
claude plugin marketplace add fcakyon/claude-codex-settings
claude plugin install simplify@claude-settingsRun /reload-plugins in an open session. New sessions load installed plugins automatically.
In the desktop app
Select + beside the prompt, then Plugins and Add plugin. Choose a plugin from the marketplace.
Add this marketplace to OpenAI Codex
Works in the Codex CLI and desktop app. The Codex IDE extension doesn’t support plugins.
codex plugin marketplace add fcakyon/claude-codex-settings
codex plugin add simplify@claude-settingsEnter /plugins to browse marketplaces interactively. Start a new session after installing.
In the desktop app
Open Plugins, find the plugin, and select Install. Start a new task before you use it.
Add this marketplace to Cursor
Plugins installed for your user work in the Cursor app and Cursor Agent CLI. The marketplace command only adds the catalog.
cursor-agent plugin marketplace add https://github.com/fcakyon/claude-codex-settings
cursor-agentIn Cursor Agent, enter /plugin to choose and install a plugin.
In the desktop app
Open Customize, find the plugin, and select Install. Choose user or project scope when prompted.
Install a local extension in Gemini CLI
Gemini CLI installs extensions from local folders. Clone the repository and run the command from its root.
git clone https://github.com/fcakyon/claude-codex-settings.git
cd claude-codex-settings
gemini extensions install --path ./plugins/simplifyReplace simplify with the plugin you want, then start a new Gemini CLI session.
Upload a skill to ChatGPT
Personal Skills work on eligible ChatGPT plans. Workspace admins can turn off skill uploads.
- Open chatgpt.com/skills
- Select +, then Upload a skill
- Choose the downloaded ZIP and wait for the security check
- Run a prompt that matches the skill description
Upload a skill to Claude.ai
Custom skills work on supported Claude plans with code execution turned on.
- Open Customize, then Skills
- Select Add, then Upload skill
- Choose the downloaded ZIP and select Save
- Run a prompt that matches the skill description
Use a plugin in a new session
Start a new session so the agent loads the plugin, then name the skill or describe the task.
Use the simplify skill to review my staged diff.
Use the humanize skill to revise this README.Keep the folder inside the ZIP
Claude.ai needs the named skill folder inside the archive. Every download here keeps it. Read SKILL.md and any scripts before you upload.
skill-name.zip
└── skill-name/
├── SKILL.md
├── scripts/
└── references/