CRITICAL FIX: Add /metadata endpoint with task enumeration for validator discovery

server/app.py

@@ -53,6 +53,26 @@ def debug():
     }
 
 
+@app.get("/metadata")
+def metadata():
+    """OpenEnv metadata endpoint with task enumeration for validator discovery."""
+    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
+        ],
+    }
+
 
 @app.get("/tasks")
 def tasks():