[ROCm][CI] Restore Mistral tool-parser compatibility after unification (#50515)

Signed-off-by: Andreas Karatzas <Andreas.Karatzas@amd.com>

vllm/parser/mistral.py

@@ -526,14 +526,21 @@ class MistralParser(ParserEngine):
     def _legacy_extract_tool_calls(
         self,
         model_output: str,
-        request: ChatCompletionRequest,
+        request: ChatCompletionRequest | None,
     ) -> ExtractedToolCallInformation:
         """Pre-v11 non-streaming extraction.
 
         Handles ``[TOOL_CALLS][{...}]`` and guided bare-array formats.
         """
+        if request is None:
+            tool_choice = None
+            tools = None
+        else:
+            tool_choice = request.tool_choice
+            tools = request.tools
+
         # tool_choice="none" with tools: never produce tool calls.
-        if request.tool_choice == "none" and request.tools:
+        if tool_choice == "none" and tools:
             return ExtractedToolCallInformation(
                 tools_called=False, tool_calls=[], content=model_output
             )
@@ -550,8 +557,8 @@ class MistralParser(ParserEngine):
                     f"but got {model_output}."
                 )
             stringified_tool_calls = raw_tool_calls[0].strip()
-        elif request.tool_choice == "required" or isinstance(
-            request.tool_choice, ChatCompletionNamedToolChoiceParam
+        elif tool_choice == "required" or isinstance(
+            tool_choice, ChatCompletionNamedToolChoiceParam
         ):
             # Guided bare-array output (no [TOOL_CALLS] marker).
             stringified_tool_calls = model_output.strip()

vllm/tool_parsers/mistral_tool_parser.py

@@ -25,6 +25,16 @@ class MistralToolParser(MistralParserToolAdapter):  # type: ignore[valid-type, m
     # correctly instead of crashing or dumping the raw envelope into arguments.
     supports_required_and_named = False
 
+    @property
+    def bot_token(self) -> str:
+        """Return the Mistral tool-call marker exposed by the legacy parser."""
+        return self._parser_engine.bot_token
+
+    @property
+    def bot_token_id(self) -> int | None:
+        """Return the token id for :attr:`bot_token`."""
+        return self._parser_engine.bot_token_id
+
     def adjust_request(
         self,
         request: ChatCompletionRequest | ResponsesRequest,