Simplify metadata task schema to minimal fields (id, has_grader) for validator compatibility

server/app.py

@@ -61,19 +61,19 @@ def debug():
 
 @app.get("/metadata")
 def metadata():
-    """Override OpenEnv metadata endpoint with task enumeration for validator discovery."""
+    """Override OpenEnv metadata endpoint with task enumeration for validator discovery.
+    
+    Task schema kept MINIMAL to avoid validator schema rejection:
+    Only include fields the validator expects: id, has_grader
+    """
     print("[VALIDATOR] GET /metadata called")
     return {
         "name": "ConfigDebugEnvironment",
         "description": "An RL environment for training AI agents to debug broken configuration files",
         "version": "1.0.0",
-        "type": "space",
         "tasks": [
             {
                 "id": tid,
-                "name": get_task(tid).description,
-                "difficulty": get_task(tid).difficulty,
-                "num_bugs": get_task(tid).num_bugs,
                 "has_grader": True,
             }
             for tid in TASK_ORDER