diff --git a/packages/core/src/mcp/oauth-utils.test.ts b/packages/core/src/mcp/oauth-utils.test.ts
index 710afe21aa..93aa507e21 100644
--- a/packages/core/src/mcp/oauth-utils.test.ts
+++ b/packages/core/src/mcp/oauth-utils.test.ts
@@ -297,14 +297,32 @@ describe('OAuthUtils', () => {
       const result = OAuthUtils.buildResourceParameter(
         'https://example.com/oauth/token',
       );
-      expect(result).toBe('https://example.com');
+      expect(result).toBe('https://example.com/oauth/token');
     });
 
     it('should handle URLs with ports', () => {
       const result = OAuthUtils.buildResourceParameter(
         'https://example.com:8080/oauth/token',
       );
-      expect(result).toBe('https://example.com:8080');
+      expect(result).toBe('https://example.com:8080/oauth/token');
+    });
+
+    it('should strip query parameters from the URL', () => {
+      const result = OAuthUtils.buildResourceParameter(
+        'https://example.com/api/v1/data?user=123&scope=read',
+      );
+      expect(result).toBe('https://example.com/api/v1/data');
+    });
+
+    it('should strip URL fragments from the URL', () => {
+      const result = OAuthUtils.buildResourceParameter(
+        'https://example.com/api/v1/data#section-one',
+      );
+      expect(result).toBe('https://example.com/api/v1/data');
+    });
+
+    it('should throw an error for invalid URLs', () => {
+      expect(() => OAuthUtils.buildResourceParameter('not-a-url')).toThrow();
     });
   });
 });
diff --git a/packages/core/src/mcp/oauth-utils.ts b/packages/core/src/mcp/oauth-utils.ts
index 4787422f52..cf6bfc289d 100644
--- a/packages/core/src/mcp/oauth-utils.ts
+++ b/packages/core/src/mcp/oauth-utils.ts
@@ -360,6 +360,6 @@ export class OAuthUtils {
    */
   static buildResourceParameter(endpointUrl: string): string {
     const url = new URL(endpointUrl);
-    return `${url.protocol}//${url.host}`;
+    return `${url.protocol}//${url.host}${url.pathname}`;
   }
 }