From trace analysis: web_search returned a JSON string, which was
wrapped as serde_json::json!(string) creating a Value::String containing
JSON. When Monty got this as MontyObject::String, the Python code
couldn't index it with result['title'] → TypeError.
Fix: try parsing the tool output string as JSON first. If valid, use the
parsed Value (becomes a Python dict/list). If not valid JSON, keep as
string. This means web_search results are directly indexable in Python:
results = web_search(query="...")
print(results["results"][0]["title"]) # works now
Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>
