> ## Documentation Index
> Fetch the complete documentation index at: https://docs.gettrillion.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Any other AI app

> Connect any app that can add an MCP server or a connector, and what to do if it cannot sign in.

Any app that can add an MCP server or a connector can use Trillion.

<Steps>
  <Step title="Find where your app adds an MCP server">
    Look for **Connectors**, **Integrations**, **Plugins**, **Tools** or **MCP** in its settings.
  </Step>

  <Step title="Paste this address">
    Most apps ask only for this address. If the app asks how to sign in, choose **OAuth**. When a Trillion page opens, tap your passkey. If the app asks for a client id, leave it empty so it registers itself; there is nothing to type.

    ```text theme={null}
    https://app.gettrillion.ai/mcp
    ```

    **When it worked:** your app lists Trillion's tools.
  </Step>

  <Step title="Only if the app cannot sign in and asks for an API key">
    Some older apps and scripts cannot sign in. Only for those: make a personal key in **Account & security** in your Trillion, copy it once, and paste it where the app asks for a key. An app that can sign in never needs one.

    ```text theme={null}
    Authorization: Bearer <your personal key>
    ```

    Anyone holding a personal key can use your account until you turn it off on your account page, so keep it safe.
  </Step>
</Steps>

## Details for app builders

If you are building the app that connects, these are the values it needs. They are also published at `https://app.gettrillion.ai/.well-known/oauth-authorization-server`.

| What | Value |
| - | - |
| MCP server | `https://app.gettrillion.ai/mcp` |
| Sign-in page (authorization) | `https://app.gettrillion.ai/authorize` |
| Token | `https://app.gettrillion.ai/oauth/token` |
| Register a client | `https://app.gettrillion.ai/oauth/register` (no secret needed) |
| Scope | `decisions` |
| Sign-in flow | Authorization code with PKCE (`S256`), and refresh tokens |
| Client authentication at the token address | `none`, `client_secret_basic` or `client_secret_post` |

An agent that should reach only part of a person's Trillion can be given a key with a chosen reach: one shared space, every space, or only their private Trillion. The person's AI makes it with [`make_agent_key`](/reference/hand-off).


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