[Bugfix] Fix the issue where tool calling does not work when using fast detokenization with dsv32 (#33964)

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

vllm/tool_parsers/deepseekv32_tool_parser.py

@@ -110,6 +110,18 @@ class DeepSeekV32ToolParser(ToolParser):
         """Generate a unique tool call ID."""
         return f"call_{uuid.uuid4().hex[:24]}"
 
+    def adjust_request(self, request):
+        request = super().adjust_request(request)
+        if request.tools and request.tool_choice != "none":
+            # Ensure tool call tokens
+            # (<｜DSML｜function_calls>, </｜DSML｜function_calls>)
+            # are not skippedduring decoding.
+            # Even though they are not marked as special tokens,
+            # setting skip_special_tokens=False ensures proper handling in
+            # transformers 5.x where decoding behavior may have changed.
+            request.skip_special_tokens = False
+        return request
+
     def _reset_streaming_state(self):
         """Reset all streaming state."""
         self.current_tool_index = 0