Fix: store capabilities as JSON string for consistent schema

extract_mcp_clients.py

@@ -57,13 +57,22 @@ def normalize_capabilities(caps):
     return caps
 
 
+def capabilities_to_string(caps):
+    """Convert capabilities to JSON string for storage."""
+    if caps is None:
+        return ''
+    if isinstance(caps, dict):
+        return json.dumps(caps, sort_keys=True)
+    return str(caps)
+
+
 def create_dataset_from_clients(clients_list, features=None):
     """Create a Hugging Face Dataset from the clients list."""
     if features is None:
         features = Features({
             'name': Value('string'),
             'version': Value('string'),
-            'capabilities': Value('null'),  # Will be inferred
+            'capabilities': Value('string'),  # Store as JSON string for consistency
             'last_seen': Value('string'),
         })
 
@@ -73,7 +82,7 @@ def create_dataset_from_clients(clients_list, features=None):
         record = {
             'name': client['name'],
             'version': client['version'],
-            'capabilities': client['capabilities'],
+            'capabilities': capabilities_to_string(client['capabilities']),
             'last_seen': client['last_seen'],
         }
         records.append(record)