[Bug] Fix gpt-oss missing tool content

The changes include adding 'with_recipient' and the Assistant's 'analysis' content.
Without adding this content, there was an issue where the gpt-oss model had a higher probability of outputting abnormal tokens when calling tools.

Signed-off-by: kyt <[email protected]>

Author: levunet

vllm/entrypoints/harmony_utils.py

@@ -213,6 +213,11 @@ def parse_chat_input(chat_msg) -> list[Message]:
     tool_calls = chat_msg.get("tool_calls")
     if role == "assistant" and tool_calls:
         msgs: list[Message] = []
+        content = chat_msg.get("content") or ""
+        analysis_msg = Message.from_role_and_content(Role.ASSISTANT, content)
+        analysis_msg = analysis_msg.with_channel("analysis")
+        msgs.append(analysis_msg)
+
         for call in tool_calls:
             func = call.get("function", {})
             name = func.get("name", "")
@@ -230,7 +235,7 @@ def parse_chat_input(chat_msg) -> list[Message]:
         content = chat_msg.get("content", "") or ""
         msg = Message.from_author_and_content(
             Author.new(Role.TOOL, f"functions.{name}"),
-            content).with_channel("commentary")
+            content).with_channel("commentary").with_recipient("assistant")
         return [msg]
 
     # Default: user/assistant/system messages with content