# ChatGPT

> Add IndexZero to ChatGPT as a connector so it can call the tools in a conversation.

Source: https://docs.indexzero.site/agents/chatgpt



ChatGPT connects to remote MCP servers through **connectors**. Custom connectors are available on plans that allow them and may need developer mode enabled in settings; the steps below assume it is.

<Steps>
  <Step>
    ### Open connector settings [#open-connector-settings]

    In ChatGPT, open **Settings**, then **Connectors**. Choose **Create** (or **Add custom connector**).
  </Step>

  <Step>
    ### Enter the endpoint [#enter-the-endpoint]

    ```
    https://app.indexzero.site/mcp
    ```

    Name it "IndexZero". Choose OAuth as the authentication method; no client id or secret is required, because the server registers clients dynamically.
  </Step>

  <Step>
    ### Approve [#approve]

    ChatGPT opens app.indexzero.site. Sign in if needed and approve the connection.
  </Step>

  <Step>
    ### Use it in a chat [#use-it-in-a-chat]

    Enable the IndexZero connector for a conversation from the tools menu and ask it to list your projects.
  </Step>
</Steps>

<Callout title="If your ChatGPT plan cannot add custom connectors">
  Use the tool catalog with function calling instead. `https://app.indexzero.site/api/mcp/catalog` returns every tool in the shape function-calling APIs expect, and requests to the endpoint can be authenticated with an [API key](/agents/api-keys). See [Any other client](/agents/other-clients).
</Callout>