[Frontend] OpenAI Responses API supports Tool/Function calling

Signed-off-by: chaunceyjiang <chaunceyjiang@gmail.com>

Author: chaunceyjiang

examples/online_serving/openai_responses_client_with_tools.py

@@ -8,7 +8,7 @@
 
 For example:
 
-vllm serve Qwen/Qwen3-1.7B --reasoning-parser qwen3\
+vllm serve Qwen/Qwen3-1.7B --reasoning-parser qwen3 \
    --guided-decoding-backend xgrammar \
       --enable-auto-tool-choice --tool-call-parser hermes
 """

vllm/entrypoints/openai/protocol.py

@@ -355,8 +355,6 @@ def _get_guided_json_from_tool(
                 raise ValueError(
                     f"Tool '{tool_name}' has not been passed in `tools`.")
             tool = tools[tool_name]
-            print(f"Using tool '{tool_name}' for guided json decoding.")
-            print(f"Tool parameters: {tool.parameters}")
             return tool.parameters
 
         if self.tool_choice == "required":
@@ -426,7 +424,7 @@ def _get_guided_decoding(self) -> Optional[GuidedDecodingParams]:
             elif response_format.type == "json_object":
                 raise NotImplementedError("json_object is not supported")
         # Function call
-        elif self.tool_choice != "none" or self.tools is not None:
+        elif not (self.tool_choice == "none" or self.tools is None):
             guided_decoding = GuidedDecodingParams.from_optional(
                 json=self._get_guided_json_from_tool())
         return guided_decoding