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Avoiding to parse string arguments containing valid JSON if the argument annotation is str (#1113)

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Giuseppe Coviello 2025-07-10 17:36:45 -04:00 • committed by GitHub
commit 0a4e8d4e17
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src/mcp/server/fastmcp/utilities/func_metadata.py
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@ -130,7 +130,7 @@ class FuncMetadata(BaseModel):
for field_name in self.arg_model.model_fields.keys(): for field_name in self.arg_model.model_fields.keys():
if field_name not in data.keys(): if field_name not in data.keys():
continue continue
if isinstance(data[field_name], str): if isinstance(data[field_name], str) and self.arg_model.model_fields[field_name].annotation is not str:
try: try:
pre_parsed = json.loads(data[field_name]) pre_parsed = json.loads(data[field_name])
except json.JSONDecodeError: except json.JSONDecodeError: