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Document MCP OAuth redirect domains #4172

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17 changes: 17 additions & 0 deletions ai/model-context-protocol.mdx
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Hosted MCP servers use the `/mcp` path in their URLs. Other navigation elements cannot use the `/mcp` path.
</Note>

### Redirect domains

When your documentation uses [authentication](/deploy/authentication-setup), users connecting to your MCP server must complete an OAuth flow. By default, this OAuth flow only allows redirects to loopback addresses (`localhost`, `127.0.0.1`, or `[::1]`) for local development.

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Did you really mean 'loopback'?

To allow MCP clients hosted on other domains to complete the OAuth flow, configure allowed redirect domains in your [MCP server settings](https://dashboard.mintlify.com/products/mcp).

<Steps>
<Step title="Navigate to MCP settings.">
In your dashboard, go to [MCP server](https://dashboard.mintlify.com/products/mcp).
</Step>
<Step title="Add redirect domains.">
In the **Redirect domains** section, enter the domain where your MCP client is hosted. For example, `app.example.com`.

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In general, use active voice instead of passive voice ('is hosted').
</Step>
</Steps>

The OAuth flow validates that redirect URIs use HTTPS and match an allowed domain. Loopback addresses are always permitted.

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Did you really mean 'URIs'?

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Did you really mean 'Loopback'?

### Rate limits

To protect availability, Mintlify applies rate limits to MCP servers.
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