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fix: serialize dict/list tool output to JSON (#6267) #6334

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fix: serialize dict/list tool output to JSON (#6267) #6334

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933b215
fix: serialize dict/list tool output to JSON (#6267)
C1-BA-B1-F3 Jun 25, 2026
27dd283
fix: use json.dumps(default=str) and update fallback warning message
C1-BA-B1-F3 Jun 25, 2026
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6 changes: 5 additions & 1 deletion lib/crewai/src/crewai/tools/structured_tool.py
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Original file line number Diff line number Diff line change
Expand Up @@ -58,6 +58,8 @@ def _format_tool_output_for_agent(tool: Any, raw_result: Any) -> str:

result_schema = getattr(tool, "result_schema", None)
if not (isinstance(result_schema, type) and issubclass(result_schema, BaseModel)):
if isinstance(raw_result, (dict, list)):
return json.dumps(raw_result, default=str)
return str(raw_result)
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coderabbitai[bot] marked this conversation as resolved.

try:
Expand All @@ -75,11 +77,13 @@ def _format_tool_output_for_agent(tool: Any, raw_result: Any) -> str:
f"Failed to validate or serialize output from tool "
f"'{getattr(tool, 'name', '<unknown>')}' using result_schema "
f"'{result_schema.__name__}': {exc.__class__.__name__}. "
"Falling back to str(raw_result)."
"Falling back to JSON for dict/list, otherwise str(raw_result)."
),
RuntimeWarning,
stacklevel=2,
)
if isinstance(raw_result, (dict, list)):
return json.dumps(raw_result, default=str)
return str(raw_result)


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