Use 9brains in Claude and ChatGPT
You can connect applications such as Claude, Claude Code or ChatGPT to 9brains. The application then works in 9brains on your behalf, with exactly your rights and never more. For example, you can build an agent in Claude Code, test it and improve its instructions without opening 9brains. Technically, 9brains acts as an MCP server here; MCP is the open standard such applications use to connect tools.
What the application can do in 9brains
Section titled “What the application can do in 9brains”- Workspaces: see which workspaces you are a member of.
- Agents: list, view and create them, change settings and instructions (
AGENTS.md), write trigger scripts and reference notes, assign integrations, knowledge bases and projects, set a schedule, start, follow and stop runs, delete agents. - Skills: list, view and create them, change settings, read, write and move files and delete individual ones, delete skills.
- Projects: list, view, create and rename them, read and write the project context (
board.mdand further notes), delete individual notes, view the list of project files, delete projects.
Files of agents and skills as well as the project context have a version history. The application can compare versions and restore an earlier one. What it writes appears there under your name. Whole agents, skills and projects cannot be restored after deletion. A project also takes its files and chats with it, for everyone involved.
Connect
Section titled “Connect”The address is the same for all applications:
https://chat.9brains.de/mcpClaude: Under Connectors, add a custom connector with this address and click Connect. In Claude Team and Enterprise, an owner adds the connector in the organization settings, then each person connects on their own. See Anthropic’s guide.
Claude Code: Run this command in the terminal, start Claude Code, enter /mcp and choose 9brains to sign in:
claude mcp add --transport http 9brains https://chat.9brains.de/mcpChatGPT: Add the address as a custom MCP server and choose OAuth as the sign-in. Where to find this depends on your plan and version; in ChatGPT Business and Enterprise, your admins decide who may do it. See OpenAI’s guide.
The menus of these applications change from time to time; if in doubt, the provider’s guide applies.
What the consent page shows
Section titled “What the consent page shows”When you connect, 9brains opens in your browser. If you are not signed in, you sign in first. 9brains then asks “Connect an application to 9brains?” and shows you:
- Origin: where the application comes from, either an address such as
claude.aior “Local application on this device” for programs like Claude Code. - Name (stated by the application): The application states its name itself; 9brains does not check it.
- Your account: the account you are currently signed in with.
- What the application may do: see which workspaces you are a member of and work there with your rights.
Only connect if you started the connection yourself just now and the origin matches the application. If the page points out that the answer goes to a different address than the origin, only connect if you know both addresses. Otherwise click “Reject”.
The connection stays in place as long as the application uses it at least every 30 days. If one of your workspaces requires two-factor authentication and the deadline has passed, you set it up first.
Which workspace the application works in
Section titled “Which workspace the application works in”Unless told otherwise, the application works in your own workspace. If you are a member of several, simply tell it which one you mean. With several workspaces it only creates something new once it is clear where it belongs; otherwise it gets the list and has to ask. Every answer tells it the workspace it acted in.
Which license you need
Section titled “Which license you need”You can connect with any license. Without the right license, however, the application only sees your workspaces.
| Area | License | In addition |
|---|---|---|
| Agents | Business or Max | To create: the group permission “Create agents”. Schedule and start only as the owner, with the role “Can administer” or as a workspace administrator. |
| Skills | Business or Max | To create: the group permission “Create own skills”. To change: the right to edit the skill. |
| Projects | Business or Max | The group permission “Use projects”, and projects must be switched on in the workspace. To write: the role “Can edit” or “Can administer” in the project. |
If something is missing, the application tells you what.
Test runs cost real money
Section titled “Test runs cost real money”When the application starts an agent, that is a real run, just like “Start a run now”. Such autonomous runs are paid out of the workspace’s credit, not your own quota, and they count towards the agent’s spend cap. Once the credit is empty, no run starts.
It also runs with the agent’s accounts set to “In chat and autonomously” in its Tools & accounts tab. What the agent may do, it really does there, for example send emails. Details under Accounts.
When someone else is working on it at the same time
Section titled “When someone else is working on it at the same time”For an agent’s instructions (AGENTS.md) and the project context, 9brains notices if something has changed since it was read. The application then gets a message and has to read again; nothing is overwritten.
Skills have no such protection, the version saved last wins. If you edit a skill in 9brains and through the application at the same time, one change can overwrite the other. You get the earlier version back through the versions.
Disconnect
Section titled “Disconnect”Under Settings → Security, the list “Connected applications” shows all your connections with origin, connection date and last use. “Disconnect” ends a connection at once; the application is refused on its next access. Nothing is deleted in 9brains. To use it again, connect it anew from within the application.
All your connections also end on their own when you change or reset your password, when your sign-in address changes or when your account is deactivated. The list only shows your own connections; administrators do not see anyone else’s either.
What is not possible
Section titled “What is not possible”- Sharing: The application does not share anything with individual people and changes no rights and no owner. One exception: if you may do so yourself, it can make a skill visible to everyone in the workspace or take that back. If it is also shared with individual people or groups, you take it back in 9brains.
- Uploading: You upload project files and agents’ file attachments in 9brains.
- Reading chats and knowledge bases: It does not see your chats or project chats, only the history of agent runs. It does not read the content of knowledge bases.