ChatGPT

Membase as a ChatGPT plugin, through the Plugins dialog, with OAuth consent in the browser.

ChatGPT connects to Membase as a custom MCP server and reads the Memories you switch on for it.

Before you start

• Developer mode may be required. ChatGPT asks for it on the web app (Pro, Plus, Business, Enterprise and Education plans; a workspace admin can turn it off); follow its on-screen instructions.
• A Membase account with at least one Memory that has run once.

Set up

1. Open ChatGPT Plugins (https://chatgpt.com/plugins) and press +. Fill the dialog:
   • a name (Membase) and a description;
   • Connection: choose the public MCP server connection;
   • the complete URL, path included: https://api.app.membase.io/mcp-http;
   • Authentication: OAuth. Leave Client ID and Secret empty: ChatGPT registers itself with the server. If ChatGPT asks you to enable Developer mode, follow the on-screen instructions.
2. Accept the trust prompt and press Create.
3. The browser opens Membase’s consent screen. Tick the Memories ChatGPT may use, and Profile access if it may read the profile. Press Approve access. The last page you should see is ChatGPT’s own; if you end up on Membase instead, ChatGPT did not receive the code: retry the connection from ChatGPT.
4. Back in ChatGPT, the plugin’s details page lists the discovered tools; use Refresh there if the list looks stale.
5. Start a new conversation and add Membase from the tools menu.

Then ask “List my Membase containers.”

What it can do

Read. list_containers, search_memories and, when ticked, get_profile. It cannot add, delete or forget anything, and cannot see a Memory that is not switched on for it. The writing and destructive tools are not in its tool list at all: tools/list does not offer them, and a call to one is refused with 403 unauthorized. ChatGPT has no way to send a developer key, so the consent path is the only one.

Which Memories it uses

An empty container list means no Memory is switched on for this connection yet. Switch one on under Uses on ChatGPT’s page in Connect, or under Use in on the Memory; the two are the same switch, and off takes effect on the next question.

Two things worth knowing:

• ChatGPT registers itself under the same client name as the Codex CLI. Membase tells them apart and shows them as two tiles on Connect; do not be surprised to see both after setting up both.
• Profile access is decided on the consent screen only; ChatGPT’s page in Connect has no profile switch. To change it, Disconnect… and set the plugin up again.

Remove it

Delete the plugin under Settings → Plugins, and Disconnect… on ChatGPT’s page in Membase’s Connect. ChatGPT does not tell the server when a plugin is removed.

If something looks wrong

It says	What it means	Do
ChatGPT asks for Developer mode	the plugin dialog needs it on this plan, or a workspace admin turned it off	follow ChatGPT’s on-screen instructions
the plugin is created but never appears in a chat	it is not added to this conversation	start a new conversation and add Membase from the tools menu
No memory access on ChatGPT’s page in Connect	authorized, no Memory switched on	switch one on under Uses
the consent screen never opens	the URL has a typo, or misses the path (a bare domain, /mcp)	paste https://api.app.membase.io/mcp-http exactly
the model answers from nothing about you	Profile access was not ticked at consent	Disconnect… on ChatGPT’s page in Connect, set the plugin up again and tick it