Add MCP client credentials documentation

ai/model-context-protocol.mdx

@@ -38,7 +38,7 @@
 The MCP search tool supports optional parameters that AI applications use to control and refine search results.
 
 - **`pageSize`**: Number of results to return, between 1 and 50. Defaults to 10.
 - **`scoreThreshold`**: Minimum relevance score between 0 and 1. Only returns results at or above this threshold. Use this to filter out low-relevance matches.
 - **`version`**: Filter results to a specific documentation version. For example, `'v0.7'`. Only returns content tagged with the specified version or content available across all versions.
 - **`language`**: Filter results to a specific language code. For example, `'en'`, `'zh'`, or `'es'`. Only returns content in the specified language or content available across all languages.
 
@@ -104,6 +104,26 @@
   </Step>
 </Steps>
 
+### Client credentials for programmatic access
+
+If you need to connect to your authenticated MCP server from a backend service or automation (machine-to-machine), you can generate client credentials instead of using the interactive OAuth flow.
+
+<Steps>
+  <Step title="Generate credentials">
+    1. Navigate to the [MCP server page](https://dashboard.mintlify.com/products/mcp) in your dashboard.
+    2. In the **Client credentials** section, click **Generate credentials**.
+    3. Enter a label to identify the credential (for example, `Production server`).
+    4. Copy the **Client ID** and **Client secret**. The secret is only shown once and cannot be retrieved later.
+  </Step>
+  <Step title="Use the credentials">
+    Use the `client_credentials` grant type with the client ID and secret to obtain an access token for your MCP server.
+  </Step>
+</Steps>
+
+<Warning>
+  Store the client secret securely. It is only displayed once when you generate the credential. If you lose it, delete the credential and generate a new one.
+</Warning>
+
 ### Rate limits
 
 To protect availability, Mintlify applies rate limits to MCP servers.