Broad rearrangement of handlers

tools/mcp-bridge.py

@@ -128,8 +128,12 @@ def handle_message(msg):
         params = msg.get("params", {})
         arguments = params.get("arguments", {})
         result = forward_to_editor(arguments)
+        if isinstance(result, dict) and "error" in result:
+            text = result["error"]
+        else:
+            text = result
         return make_jsonrpc(msg_id, {
-            "content": [{"type": "text", "text": result}],
+            "content": [{"type": "text", "text": text}],
         })
 
     return {