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Make0 AI
Codex

CLI · OpenAI

Codex with a Brain that persists.

Add Make0 to ~/.codex/config.toml as a Streamable HTTP server, then run OAuth login so Codex can read and write memories.

Connect Codex All apps and agents

01 · Why connect

Codex CLI, the IDE extension, and ChatGPT desktop share MCP config. Make0 is a remote HTTP server with OAuth (DCR) or an API key.

Use url plus OAuth, not a stdio command. After adding the server, run codex mcp login make0-brain if the client does not prompt automatically. The Make0 MCP URL is https://make0.ai/mcp. Codex can sign in with OAuth on any plan, or use an API key on Pro and Max. Either way, you pick which brains it can use.

02 · How to connect Codex

Install Make0 Brain in 4 steps

  1. 01

    Open Codex MCP settings

    In ChatGPT desktop or the Codex IDE extension, open Settings → MCP servers → Add server. Or edit ~/.codex/config.toml.

  2. 02

    Choose Streamable HTTP

    Name the server make0-brain and set the URL to https://make0.ai/mcp.

  3. 03

    Authenticate

    Select Authenticate, or run: codex mcp login make0-brain. Sign in to Make0 and pick brains.

  4. 04

    Confirm in /mcp

    In the Codex TUI, type /mcp to see connected servers. Ask Codex to search your Brain.

03 · ~/.codex/config.toml

Copy this into Codex

Use HTTP or Streamable HTTP. Do not wrap Make0 as a local stdio command. This config signs in with OAuth.

[mcp_servers.make0-brain]
url = "https://make0.ai/mcp"

04 · API key

Or connect with an API key

On Pro and Max you can skip the sign-in and use an API key. In Make0, open Connect Brain via MCP, choose API key MCP, and create a key with the brains and access it needs. Export the key as an environment variable and point bearer_token_env_var at it, so the key stays out of config.toml. Skip codex mcp login.

~/.codex/config.toml

[mcp_servers.make0-brain]
url = "https://make0.ai/mcp"
bearer_token_env_var = "MAKE0_API_KEY"

Replace YOUR_MAKE0_API_KEY with your key. Make0 shows a key once, so keep it somewhere safe. You can revoke it any time in Settings.

05 · System instruction

Tell the agent to prefer Make0 Brain

Paste this into Codex’s system instructions or custom instructions so it reads and writes memory through Make0 instead of its own store.

Make0 Brain is my source of truth for durable memory. Always search it before answering about me, my work, people, preferences, or past decisions. Save lasting facts and decisions to Brain. Never guess or invent memories. Use Brain exclusively for durable memory.

Questions

Connecting Codex

How do I connect Make0 Brain to Codex?+

Add Make0 as a remote HTTP MCP server using https://make0.ai/mcp. In the Make0 connect dialog, choose OAuth and Codex will open a sign-in so you can pick which brains it can use. On Pro or Max, if Codex accepts custom headers, you can choose API key MCP instead and send the key to this URL as Authorization: Bearer.

What is the Make0 MCP URL?+

The production Make0 Brain MCP endpoint is https://make0.ai/mcp. Use HTTP or Streamable HTTP if the client asks for a transport. Server name: make0-brain.

Does Make0 Brain MCP use OAuth?+

Yes. Compatible clients discover OAuth from the MCP server, you sign in to Make0, and you grant read or write access to specific brains. Two-factor authentication may be required.

Can I use an API key instead of OAuth?+

On Pro or Max, yes, for apps that let you set an HTTP header. Open Connect Brain via MCP, choose API key MCP, and create a key for specific brains or all brains. Send it to https://make0.ai/mcp as Authorization: Bearer. OAuth works on every plan; Free and Lite use OAuth.

Official Codex MCP docs: developers.openai.com/codex/mcp