Add docs for Gemini code assist (#1426)

Author: eseliger

docs/api/mcp/index.mdx

@@ -124,7 +124,8 @@ You can also add the Sourcegraph MCP server as a locally-scoped server, which is
 1. Run the following command in your terminal:
 
    ```bash
-   claude mcp add sourcegraph -s local --transport http https://your-sourcegraph-instance.com/.api/mcp/v1 --header "Authorization: token YOUR_ACCESS_TOKEN"
+   claude mcp add --transport http sourcegraph https://your-sourcegraph-instance.com/.api/mcp/v1 \
+     --header "Authorization: token YOUR_ACCESS_TOKEN"
    ```
 
    <Callout type="info">
@@ -133,6 +134,33 @@ You can also add the Sourcegraph MCP server as a locally-scoped server, which is
 
 Locally-scoped servers take precedence over project-scoped servers with the same name and are stored in your project-specific user settings.
 
+### Google Gemini Code Assist
+
+You can add the Sourcegraph MCP server to Google Gemini Code Assist by configuring the `.gemini/settings.json` file:
+
+1. Open or create the configuration file at `~/.gemini/settings.json` (or the equivalent path on your system).
+2. Add the following configuration:
+
+   ```json
+   {
+     "mcpServers": {
+       "sourcegraph": {
+         "httpUrl": "https://your-sourcegraph-instance.com/.api/mcp/v1",
+         "headers": {
+           "Authorization": "token YOUR_ACCESS_TOKEN"
+         }
+       }
+     }
+   }
+   ```
+
+   <Callout type="info">
+     Replace `your-sourcegraph-instance.com` with your Sourcegraph instance URL and `YOUR_ACCESS_TOKEN` with your access token.
+   </Callout>
+
+3. Save the configuration file.
+4. Restart Gemini Code Assist to apply the new configuration.
+
 ### Cursor
 
 You can add the Sourcegraph MCP server to Cursor by configuring it in your MCP settings file: