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[Bugfix] fix Qwen3.5 tool calling bug #36774

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Merged
DarkLight1337 merged 3 commits into from
Mar 16, 2026
Merged

[Bugfix] fix Qwen3.5 tool calling bug #36774

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d20e9b9
[Bugfix] fix Qwen3.5 tool calling bug
chaunceyjiang Mar 11, 2026
a4c94b5
[Bugfix] fix Qwen3.5 tool calling bug
chaunceyjiang Mar 12, 2026
28bb218
Merge branch 'main' into qwen3.5_tool_bug
chaunceyjiang Mar 13, 2026
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12 changes: 7 additions & 5 deletions vllm/tool_parsers/qwen3coder_tool_parser.py
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Original file line number Diff line number Diff line change
Expand Up @@ -249,7 +249,10 @@ def _parse_xml_function_call(
self, function_call_str: str, tools: list[ChatCompletionToolsParam] | None
) -> ToolCall | None:
# Extract function name
end_index = function_call_str.index(">")
end_index = function_call_str.find(">")
# If there's no ">" character, this is not a valid xml function call
if end_index == -1:
return None
function_name = function_call_str[:end_index]
param_config = self._get_arguments_config(function_name, tools)
parameters = function_call_str[end_index + 1 :]
Expand Down Expand Up @@ -316,7 +319,6 @@ def extract_tool_calls(
self._parse_xml_function_call(function_call_str, request.tools)
for function_call_str in function_calls
]

# Populate prev_tool_call_arr for serving layer to set finish_reason
self.prev_tool_call_arr.clear() # Clear previous calls
for tool_call in tool_calls:
Expand All @@ -333,10 +335,10 @@ def extract_tool_calls(
idx = model_output.find(self.tool_call_prefix)
content_index = content_index if content_index >= 0 else idx
content = model_output[:content_index] # .rstrip()

valid_tool_calls = [tc for tc in tool_calls if tc is not None]
return ExtractedToolCallInformation(
tools_called=(len(tool_calls) > 0),
tool_calls=tool_calls,
tools_called=(len(valid_tool_calls) > 0),
tool_calls=valid_tool_calls,
content=content if content else None,
)

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