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Based on each vendor’s official docs, checked

Check which plugins, hooks and MCP servers your agent loads

Plugins can bundle hooks and MCP servers, and hooks run commands on your machine, so it is worth knowing exactly what your coding agent loads in a session. Both Claude Code and OpenAI Codex have built-in commands that show it. This guide lists them from the official Claude Code and Codex docs, checked November 5, 2026, and shows how to turn off anything you didn’t mean to install.

  1. 1. List plugins in Claude Code

    In a session, run /plugin and open the Installed tab to see each plugin with its scope. From your shell, claude plugin list prints the same list with Version, Scope and Status lines. Plugins you haven’t used lately appear under Not used recently.

    claude plugin list

  2. 2. List hooks and MCP servers in Claude Code

    /hooks lists every hook registered for the session, grouped by event. /mcp shows each MCP server, its connection status and whether you approved it for this project; claude mcp list prints a health status per server. /context shows what each loaded item adds to the context window.

    claude mcp list
/hooks
/context

  3. 3. List plugins in Codex

    In Codex CLI, /plugins opens the plugin browser, grouped by marketplace. Open a plugin to inspect it, uninstall it, or press Space on an installed plugin to turn it on or off.

    codex
/plugins

  4. 4. List hooks and MCP servers in Codex

    Use /hooks in the CLI to see hook sources, review new or changed hooks, trust them or disable individual ones. codex mcp list shows configured servers, and /mcp in the TUI shows the active ones.

    codex mcp list
/hooks
/mcp

Where hooks and servers come from

Claude Code reads hooks from the hooks key in settings.json; only plugins load a separate hooks/hooks.json. Project MCP servers live in .mcp.json at the repository root and need a one-time approval. A plugin can also bring its own hooks and MCP servers, which is why Anthropic says to read a plugin’s details before installing it.

Codex looks for hooks in hooks.json or inline [hooks] tables in config.toml, in ~/.codex/ and in the repository’s .codex/. Enabled plugins can bundle hooks too. MCP servers are [mcp_servers.<name>] tables in config.toml.

Codex reviews hooks before they run

Codex requires you to review and trust each non-managed hook before it runs, and records trust against the hook’s hash, so a new or changed hook is skipped until you trust it again. Plugin hooks go through the same review. Project hooks load only when the project’s .codex/ folder is trusted. Managed hooks set by an organization are trusted by policy and can’t be disabled from the hook browser.

Turn off what you don’t want

In Claude Code, disable or uninstall a plugin from the Installed tab in /plugin, or from the shell with claude plugin disable or claude plugin uninstall and the plugin name. For a plugin the repository’s .claude/settings.json enables, Claude Code asks whether to disable it just for you or uninstall it for everyone. Plugins at Managed scope come from your organization and can’t be changed there.

In Codex, set enabled = false on an MCP server table to switch it off without deleting it, toggle plugins with Space in /plugins, and disable individual hooks in /hooks.

Moving servers between agents

Claude Code and Codex store MCP servers in different formats, JSON and TOML. If you rebuild your setup after a cleanup, our MCP config generator writes the right block for each agent from one server definition.

Tips

Next steps

How to add an MCP server to Codex

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How to add an MCP server to Cursor

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How to add an MCP server to GitHub Copilot in VS Code

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How to add an MCP server to Google Antigravity

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How to migrate from Gemini CLI to Antigravity CLI

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Portable agent skills: one SKILL.md for every coding agent

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Safe “always allow” rules for Claude Code and Codex CLI

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GitHub Copilot CLI yolo mode: --allow-all and safer tool rules

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Codex sandbox modes and approval policies explained

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How to install Claude Code on macOS, Linux and Windows

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How to install the OpenAI Codex CLI

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Claude Code auto mode: what runs, what gets blocked, how to turn it off

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Agent Skills moves to the Agentic AI Foundation: what changes

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MCP security: the risks in MCP servers and how to lock them down

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Claude Code in VS Code: install, shortcuts and CLI differences

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What is AGENTS.md? The open instruction file for coding agents

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Claude Code on Windows: native, WSL and common errors

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Codex skills: create, install and use SKILL.md skills in Codex

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GitHub Copilot CLI: install, sign in and start using it

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Cursor Agent SDK: build, test and deploy agents as code

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GPT-6.1 Terra in Codex and the API: setup, pricing and limits

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MCP OAuth: connect a remote MCP server in Claude Code, Codex and Cursor

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Codex config.toml: location, precedence and the settings to change

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Codex on Windows: native sandbox setup, WSL and fixes

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Antigravity CLI (agy): install, sign in, modes and commands

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Google Antigravity on Windows: install, WSL, sandbox and fixes

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GitHub Copilot coding agent (now cloud agent): how to use it

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GitHub Copilot agent mode: how to use it in your IDE

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Claude Code tips from Anthropic’s best practices

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Claude Code with OpenRouter: setup, models and troubleshooting

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How to add an MCP server: Claude Code, Codex, Cursor, Copilot and Antigravity

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Supabase RLS for AI-built apps: grants, policies and tests

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Antigravity skills: create, store and run SKILL.md skills

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Claude Code in JetBrains IDEs: install, connect and fix issues

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GitHub Copilot skills: create, install and use agent skills

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Claude Code subagents: create, configure and run them

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Cursor rules examples: .mdc files for each rule type

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Fix spawn npx ENOENT when starting an MCP server

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Postman and auto-installed agent plugins

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What is a Claude Code plugin?

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What are hooks?

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What is an MCP server?

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Codex config.toml

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MCP config generator

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Claude Code

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OpenAI Codex

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Frequently asked questions

Run /plugin and open the Installed tab, or run claude plugin list in your shell.

Sources