Taming Qwen3 27B's Over-Reasoning With an AI-Generated System Prompt Patch
ea_man · reddit · 2026-09-08
The author hit a wall running Qwen3 dense 27B (Q6XL, KV cache q80, temp 0.85, medium reasoning effort): over-thinking, failing precise instructions, re-evaluating seen data, looping "Actually…/Wait…/Hmm…", meta-reasoning and intent-guessing.
The fix workflow is worth copying:
- Fed old Pi coding session reasoning traces to GPT and Qwen to identify recurring misbehaviors
- Had them generate an APPENDSYSTEM.md patch targeting those pathologies
- Dropped it into /.pi/agent/APPENDSYSTEM.md to steer the agent
Both the patch file and a reasoning pathology report are publicly shared; the author invites others to contribute rules for similar issues.
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