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

# MCP

> Expose your apps as MCP tools to AI clients like Claude, Cursor, and Codex.

Any deployed Major app can expose its API as [Model Context Protocol](https://modelcontextprotocol.io) (MCP) tools, so AI clients like Claude, Cursor, and Codex can call your app's endpoints directly. All opted-in apps in your organization are reachable through a single per-org **gateway** endpoint.

## Enabling MCP for an app

1. Open a **deployed** app in the editor and go to the **Settings** tab.
2. In the **App MCP** section, choose the API route to serve MCP from (for example, `/api/mcp`).
3. Save. The app's tools are now reachable through the org gateway.

To stop exposing an app, set its App MCP section back to **Disabled**.

## The organization gateway

Every organization has one gateway endpoint that aggregates all opted-in apps:

```
https://mcp.major.build/<org-slug>
```

Find this URL, and the list of apps currently exposing MCP, under **Settings > MCP**.

### Connecting a client

Point any MCP-capable client at the gateway URL. Major handles authentication over OAuth — the first time a client connects, you're redirected to a Major sign-in tab to grant access, after which the connector lights up and your apps' tools become available.

The steps differ slightly per client (Claude Desktop, Claude Code, Codex, Cursor); the **Settings > MCP** page shows the exact instructions for each. For example, in Claude Desktop you add the gateway URL under **Settings > Connectors > Add custom connector**.

<Tip>
  Pick a connector name distinct from your apps' names — clients show the connector name when listing tools, so a distinct name keeps things readable.
</Tip>

## Access

Connecting to the gateway uses your own Major identity. Tools are scoped to the apps you can access in the organization, and every call is authenticated — the same permissions that govern the app in Major apply through MCP.