add function call parser for DeepSeek V3 (#5224)

python/sglang/srt/openai_api/adapter.py

@@ -938,6 +938,35 @@ def v1_chat_generate_request(
 
             if chat_template_name is None:
                 openai_compatible_messages = []
+                if (
+                    tools
+                    and tokenizer_manager.server_args.tool_call_parser == "deepseekv3"
+                ):
+                    # add function call prompt to deepseekv3
+                    openai_compatible_messages.append(
+                        {
+                            "role": "system",
+                            "content": """You are a helpful Assistant.
+                    ## Tools
+                    ### Function
+                    You have the following functions available:
+                    """
+                            + "".join(
+                                [
+                                    f"""
+                        - `{tool['name']}`:
+                        ```json
+                        {json.dumps(tool)}
+                        ```
+                        """
+                                    for tool in tools
+                                ]
+                            ),
+                        }
+                    )
+                    # TODO fix the compatible issues with xgrammar
+                    strict_tag = None
+
                 for message in request.messages:
                     if isinstance(message.content, str):
                         openai_compatible_messages.append(