feat(mcp): set X-Stainless-MCP header

Author: stainless-app[bot]

packages/mcp-server/src/server.ts

@@ -65,7 +65,7 @@ export function init(params: {
 
   const endpointMap = Object.fromEntries(providedEndpoints.map((endpoint) => [endpoint.tool.name, endpoint]));
 
-  const client = params.client || new ScanDocuments({});
+  const client = params.client || new ScanDocuments({ defaultHeaders: { 'X-Stainless-MCP': 'true' } });
 
   server.setRequestHandler(ListToolsRequestSchema, async () => {
     return {