AI BriefingvLLM Fixes Qwen Tool Calling Bug
Key point
A parser error in vLLM was found to cause malfunctioning Tool Calling functionality in Qwen models.
Details
When running Qwen 3, 3.5, 3.6 models using the vLLM engine, issues have been reported where Tool Calling and agent-based coding features do not work properly.
Upon investigation, multiple bugs were confirmed in vLLM's Reasoning Parser and Tool Parser. Key issues include the last newline (\n) being ignored during tool calls.
Currently, numerous GitHub Pull Requests have been submitted to the vLLM project to resolve this issue. Developers building or deploying agent systems using Qwen models should check for the latest vLLM version that includes these patches.
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