diff --git a/server/src/index.ts b/server/src/index.ts
index b294cfe74..ed79ae90e 100644
--- a/server/src/index.ts
+++ b/server/src/index.ts
@@ -39,6 +39,10 @@ const { values } = parseArgs({
 
 const app = express();
 app.use(cors());
+app.use((req, res, next) => {
+  res.header("Access-Control-Expose-Headers", "mcp-session-id");
+  next();
+});
 
 const webAppTransports: Map<string, Transport> = new Map<string, Transport>(); // Transports by sessionId