How to integrate Mem MCP with Codex

Codex is one of the most popular coding harnesses out there. And MCP makes the experience even better. With Mem MCP integration, you can draft, triage, summarise emails, and much more, all without leaving the terminal or the app, whichever you prefer.

Mem logoMem
Api Key

Mem is a note-taking and knowledge management tool for capturing and organizing information. It helps users quickly retrieve thoughts and ideas, keeping everything searchable and interconnected.

11 Tools

Introduction

Codex is one of the most popular coding harnesses out there. And MCP makes the experience even better. With Mem MCP integration, you can draft, triage, summarise emails, and much more, all without leaving the terminal or the app, whichever you prefer.

Also integrate Mem with

Why use Composio?

Apart from a managed and hosted MCP server, you will get:

  • CodeAct: A dedicated workbench that allows GPT to write its code to handle complex tool chaining. Reduces to-and-fro with LLMs for frequent tool calling.
  • Large tool responses: Handle them to minimise context rot.
  • Dynamic just-in-time access to 20,000 tools across 1000+ other Apps for cross-app workflows. It loads the tools you need, so GPTs aren't overwhelmed by tools you don't need.

How to install Mem MCP in Codex

Run the setup command

Run this command in your terminal to add the Composio MCP server to Codex.

Terminal

It will initiate the authentication in a browser window, authorize Codex to access your Composio account.

Composio authentication page

(Optional) Authenticate with OAuth

To authenticate manually, run the login command to open a browser window and authorize Codex to access your Composio account.

bash
codex mcp login composio

Verify the connection

Run codex mcp list to confirm Composio appears as a registered MCP server.

bash
codex mcp list

Codex App

Codex App follows the same approach as VS Code.

  1. Click ⚙️ on the bottom left → MCP Servers → + Add servers → Streamable HTTP:
  2. Fill the header and Key fields with { "x-consumer-api-key" = "ck_*******" }.
  3. The Key is the Composio API key, that you can find on dashboard.composio.dev
  4. Click on Authenticate and authorize Codex to your Composio account and you're all set.
Codex App MCP setup
  1. Restart and verify if it's there in .codex/config.toml
bash
[mcp_servers.composio]
url = "https://connect.composio.dev/mcp"
http_headers = { "x-consumer-api-key" = "ck_*******" }

What is the Mem MCP server, and what's possible with it?

The Mem MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Mem account. It provides structured and secure access to your notes and collections, so your agent can perform actions like creating notes, organizing collections, retrieving note content, and deleting outdated information on your behalf.

  • Automated note creation: Ask your agent to quickly capture ideas, meeting summaries, or research notes and save them directly into your Mem workspace.
  • Organize with collections: Direct your agent to group related notes by creating new collections for projects, topics, or teams, keeping your knowledge base tidy and efficient.
  • Retrieve and review notes: Let your agent fetch the content and metadata of any note by its identifier, making it easy to reference or summarize past information.
  • Cleanup and delete notes or collections: Instruct your agent to remove outdated notes or entire collections for a clutter-free knowledge base.

Conclusion

You've successfully integrated Mem with Codex using Composio's MCP server. Now you can interact with Mem directly from your terminal, VS Code, or the Codex App using natural language commands.

Key benefits of this setup:

  • Seamless integration across CLI, VS Code, and standalone app
  • Natural language commands for Mem operations
  • Managed authentication through Composio
  • Access to 20,000+ tools across 1000+ apps for cross-app workflows
  • CodeAct workbench for complex tool chaining

Next steps:

  • Try asking Codex to perform various Mem operations
  • Explore cross-app workflows by connecting more toolkits
  • Build automation scripts that leverage Codex's AI capabilities
TOOLS

Supported Tools

Every Mem action and event your agent gets out of the box.

Create Collection

Creates a new collection in Mem for organizing and grouping related notes.

Create Note V2

Tool to create a new note with markdown content and optional collection associations.

Delete Collection

Tool to permanently delete a Mem collection.

Delete Note

Tool to permanently delete a specific note.

Get Collection

Retrieve the details of a Mem collection by its UUID.

List Collections

List collections with pagination support.

List Notes

Tool to list notes with pagination and filtering options.

Read Note

Retrieve the content and metadata of a Mem note by its UUID.

Save Content

Tool to process and remember any raw content using AI.

Search Collections

Tool to search collections using an optional query string.

Search Notes

Tool to search notes in Mem using a query string with optional filtering.

FAQ

Frequently asked questions

With a standalone Mem MCP server, the agents and LLMs can only access a fixed set of Mem tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Mem and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Codex fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Mem tools.

Yes, absolutely. You can configure which Mem scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Mem data and credentials are handled as safely as possible.

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