qwen3coder tool parser fix anyOf double encoded parameters (vllm-project#36032)

Signed-off-by: Christian Munley <[email protected]>

Author: cmunley1

vllm/tool_parsers/qwen3coder_tool_parser.py

@@ -157,6 +157,12 @@ def _convert_param_value(
             and "type" in param_config[param_name]
         ):
             param_type = str(param_config[param_name]["type"]).strip().lower()
+        elif (
+            isinstance(param_config[param_name], dict)
+            and "anyOf" in param_config[param_name]
+        ):
+            # anyOf has no top-level "type"; treat as object to trigger json.loads.
+            param_type = "object"
         else:
             param_type = "string"
         if param_type in ["string", "str", "text", "varchar", "char", "enum"]: