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[Bugfix] Fix IndexError when choosing tool while having a tool parser #9049

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[Bugfix] Fix IndexError when choosing tool while having a tool parser #9049

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9 changes: 6 additions & 3 deletions vllm/entrypoints/openai/serving_chat.py
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Original file line number Diff line number Diff line change
Expand Up @@ -505,15 +505,18 @@ async def chat_completion_stream_generator(
# any tokens that were generated but previously
# matched by partial json parsing
# only happens if we are NOT using guided decoding
if tool_parser:
if tool_choice_auto:
assert tool_parser is not None
index = len(
tool_parser.prev_tool_call_arr) - 1 if len(
tool_parser.prev_tool_call_arr) > 0 else 0
else:
index = 0

if self._should_check_for_unstreamed_tool_arg_tokens(
delta_message, output) and tool_parser:
if tool_choice_auto and \
self._should_check_for_unstreamed_tool_arg_tokens(
delta_message, output):
assert tool_parser is not None
# get the expected call based on partial JSON
# parsing which "autocompletes" the JSON
expected_call = json.dumps(
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