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qwen 3.5 - tool errors because of </thinking>

Reddit r/LocalLLaMA / 3/15/2026

💬 OpinionTools & Practical Usage

Key Points

  • User reports that Qwen 3.5 35B A3B exhibited tool errors due to mismatched <think> and </thinking> tags, causing confusing reasoning flows.
  • Adding correction instructions to the system prompt to fix the tag usage substantially improved reliability.
  • The post offers a practical tip for others facing similar prompt-output issues with AI tools.
  • The discussion links to the Reddit thread and comments for additional context.

Not sure if it's just me, but I've been playing with qwen 3.5 35B A3B and was finding the tool use very terrible. I realized it was using <think> but closing with </thinking> which was confusing cline. After adding this correction instructions telling the system prompt to correct that I find it much more reliable.

Hope this helps someone.

submitted by /u/PairOfRussels
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