Connect ChatGPT and Codex

ChatGPT Plus or Pro

1. 1

   On chatgpt.com, open Settings → Apps & Connectors → Advanced settings and turn on Developer mode.

2. 2

   Back in Apps & Connectors, choose Create. Name it GlobalBrain, paste this address as the MCP server URL, set authentication to OAuth, confirm you trust it, and choose Create.

   https://mcp-staging.global-brain.ai/mcp

3. 3

   The GlobalBrain sign-in page opens. Enter your email and choose Email me a sign-in link. Then either follow the link in the email or type the code from it on the page.

   New to GlobalBrain? The email creates your account, and you set up your brain in about a minute. Then name the connection (such as “ChatGPT”; its saved thoughts are labelled with it) and choose Approve.

4. 4

   Tell ChatGPT how to use it. In Settings → Personalization → Custom instructions, paste:

   GlobalBrain is my shared memory across all my AI tools. Use its tools without waiting to be asked. This tool's name is: ChatGPT.
   
   Search first. Before answering about my work, decisions, preferences or plans, call search_thoughts.
   
   Capture. When something is worth keeping (a decision, insight, plan, open question, how-to or preference), search first to avoid duplicates, then call capture_thought with:
   - content: self-contained, readable by another AI later
   - kind: observation, hypothesis, decision, preference, question, procedure or reference
   - title: 5 to 10 words
   - producer_client: ChatGPT
   
   Link. If a thought builds on, backs up, contradicts, replaces or duplicates another, call add_relationship with relationship_type derived_from, supports, contradicts, supersedes, elaborates or duplicate_of.
   
   Flag for use. To mark a thought for later work, call add_use with purpose task, research_input, reference, architecture_proposal or blog_candidate.
   
   Retire. When a decision is replaced, call update_lifecycle on the old thought with lifecycle_status superseded and a short reason.

5. 5

   Check it works: in a new chat, turn on GlobalBrain from the + menu, then ask “What's my GlobalBrain connection status?” It answers with your brain's name and the name this connection saves under.

ChatGPT Business or Enterprise

A workspace admin adds GlobalBrain for the workspace, then each person activates it for themselves. Your own Settings won't offer to create it. If you're the admin, do both parts.

The admin, once

1. 1

   On admin.openai.com, open Admin Console → Plugins and choose Add.

2. 2

   In New custom plugin, name it GlobalBrain. Under Connection, choose Server URL and paste this address. Set Authentication to OAuth and leave the advanced authentication settings as they are. Tick I understand and want to continue, then choose Create.

   https://mcp-staging.global-brain.ai/mcp

3. 3

   The GlobalBrain sign-in page opens. Enter your email and choose Email me a sign-in link. Then either follow the link in the email or type the code from it on the page.

   New to GlobalBrain? The email creates your account, and you set up your brain in about a minute. Then name the connection (such as “ChatGPT”; its saved thoughts are labelled with it) and choose Approve.

4. 4

   On the plugin's page, set Availability for who should have it. Leave Permissions on Allow all tools and New tools on Enable all new tools, so new GlobalBrain tools appear by themselves, and turn off Allow site visitors.

Each person, including the admin

1. 1

   On chatgpt.com, open Settings → Plugins → GlobalBrain and choose Activate. ChatGPT shows a couple of warnings to open, read and accept. If it asks you to sign in, use your own GlobalBrain account, so you reach only your own brain.

   Skip this and GlobalBrain still appears in a chat's + menu, but ChatGPT reports its tools as unavailable.

2. 2

   Tell ChatGPT how to use it. In Settings → Personalization → Custom instructions, paste:

   GlobalBrain is my shared memory across all my AI tools. Use its tools without waiting to be asked. This tool's name is: ChatGPT.
   
   Search first. Before answering about my work, decisions, preferences or plans, call search_thoughts.
   
   Capture. When something is worth keeping (a decision, insight, plan, open question, how-to or preference), search first to avoid duplicates, then call capture_thought with:
   - content: self-contained, readable by another AI later
   - kind: observation, hypothesis, decision, preference, question, procedure or reference
   - title: 5 to 10 words
   - producer_client: ChatGPT
   
   Link. If a thought builds on, backs up, contradicts, replaces or duplicates another, call add_relationship with relationship_type derived_from, supports, contradicts, supersedes, elaborates or duplicate_of.
   
   Flag for use. To mark a thought for later work, call add_use with purpose task, research_input, reference, architecture_proposal or blog_candidate.
   
   Retire. When a decision is replaced, call update_lifecycle on the old thought with lifecycle_status superseded and a short reason.

3. 3

   Check it works: in a new chat, turn on GlobalBrain from the + menu, then ask “What's my GlobalBrain connection status?” It answers with your brain's name and the name this connection saves under.

Codex

1. 1

   Connect ChatGPT first (above), with the same account. Codex has no setup of its own: it uses the connectors you created on chatgpt.com.

2. 2

   In the Codex app, GlobalBrain appears under Sources. Make sure it's on.

3. 3

   Check it works: in a Codex chat, ask “What's my GlobalBrain connection status?” It answers with your brain's name and the name this connection saves under.