[Bugfix][Tool Parser] ernie45: keep content when no complete tool call is found

tests/tool_parsers/test_ernie45_moe_tool_parser.py

@@ -60,6 +60,20 @@ def test_extract_tool_calls_no_tools(ernie45_tool_parser):
     assert extracted_tool_calls.content == model_output
 
 
+def test_extract_tool_calls_truncated_keeps_content(ernie45_tool_parser):
+    # Output cut off (e.g. by max_tokens) before </tool_call> has no complete call,
+    # so it must be returned as content instead of being dropped.
+    model_output = (
+        'Sure.\n<tool_call>\n{"name": "get_weather", "arguments": {"city": "Par'
+    )
+    extracted_tool_calls = ernie45_tool_parser.extract_tool_calls(
+        model_output, request=None
+    )
+    assert not extracted_tool_calls.tools_called
+    assert extracted_tool_calls.tool_calls == []
+    assert extracted_tool_calls.content == model_output
+
+
 @pytest.mark.parametrize(
     ids=[
         "single_tool_call",

vllm/tool_parsers/ernie45_tool_parser.py

@@ -99,6 +99,11 @@ def extract_tool_calls(
                         )
                     )
 
+                if not tool_calls:
+                    return ExtractedToolCallInformation(
+                        tools_called=False, tool_calls=[], content=model_output
+                    )
+
                 content = model_output[
                     : model_output.find(self.tool_calls_start_token)
                 ].rstrip("\n")