fix

dsp-ant · dsp-ant · commit d788424caa43 · 2025-03-27T16:44:44.000Z
diff --git a/src/mcp/server/fastmcp/utilities/func_metadata.py b/src/mcp/server/fastmcp/utilities/func_metadata.py
@@ -88,7 +88,7 @@ def pre_parse_json(self, data: dict[str, Any]) -> dict[str, Any]:
                     pre_parsed = json.loads(data[field_name])
                 except json.JSONDecodeError:
                     continue  # Not JSON - skip
-                if isinstance(pre_parsed, (str, int, float)):
+                if isinstance(pre_parsed, str | int | float):
                     # This is likely that the raw value is e.g. `"hello"` which we
                     # Should really be parsed as '"hello"' in Python - but if we parse
                     # it as JSON it'll turn into just 'hello'. So we skip it.
