OneBob in Claude, ChatGPT and 9brains

Overview

OneBob runs its own MCP server (Model Context Protocol), the open standard AI assistants use to work with other apps. Once connected, your assistant can look things up and make changes in OneBob for you: more than 140 tools cover customers, contacts, deals, projects, tasks, time tracking, absences, travel expenses and more. Every app connects to the same address: https://api.onebob.io/mcp

• Connecting takes about a minute: add the URL in your AI app, sign in to OneBob and allow the connection.
• The assistant acts as you, in the one workspace you choose, and can never do more than your own role allows.
• Claude, ChatGPT and 9brains need no token: the app signs in through OAuth and renews its access on its own while you use it.
• You can disconnect an app at any time under Connected apps in OneBob.

Estimated time: about a minute per app.

This works in claude.ai and in Claude Desktop.

1. 1In Claude, open the connector settings and add a custom connector.
2. 2Give it a name such as OneBob and enter the URL https://api.onebob.io/mcp. Nothing else is needed: no client ID, no secret.
3. 3Save and connect. Claude opens the OneBob consent page in your browser (step 4).

ChatGPT connects to OneBob as a custom MCP connector.

1. 1In ChatGPT, open the connector settings and add a custom MCP connector. If the option is missing, your ChatGPT plan may offer it only in a developer mode.
2. 2Enter the URL https://api.onebob.io/mcp and choose OAuth as the authentication method.
3. 3Create the connector and connect. ChatGPT opens the OneBob consent page (step 4).

9brains connects to OneBob as an MCP server.

1. 1In 9brains, open the settings for MCP servers and add a new MCP server.
2. 2Enter the URL https://api.onebob.io/mcp. If 9brains asks for the authentication method, choose OAuth.
3. 3Save and connect. 9brains opens the OneBob consent page (step 4).

The consent page is the same for every app. It shows the name of the app and the domain it connects to.

1. 1Sign in to OneBob if you are not signed in yet. OneBob may ask for your password again before you can allow an app.
2. 2Check the app name and the domain. Under Organization, pick the one workspace the app may act in.
3. 3Click Allow. You return to the app, and the connection is live.
4. 4What the assistant may do follows your own permissions: it sees and changes only what your role allows in that workspace. If your role changes, so does what the assistant can do.

A client that cannot sign in through OAuth but can send a header uses a personal access token instead.

1. 1In OneBob, open the API Tokens page (/settings/api-tokens) and create a token with the permissions the client needs. The token is shown only once, so copy it right away.
2. 2In the client, add the MCP server with the URL https://api.onebob.io/mcp and send the token in the Authorization header as Bearer followed by the token.
3. 3The permissions of the token decide which tools the client is offered and which it may call. Revoke the token on the same page when you no longer need it.

You stay in control of every connection.

1. 1In OneBob, open the API Tokens page (Settings, or the user menu top right) and find the app under Connected apps.
2. 2Click Disconnect. The app loses access immediately.
3. 3A connection left unused for 30 days expires on its own; to use it again, connect it from the app.