The other day I upgraded my pi.dev coding harness and was testing with Qwen 3.6 35B-A3B model on my Laptop and noticed there was a slight drop in performance from the earlier version I used though the agent worked as expected. Any slight changes in the system prompts will have impact on performance and this is understandable as LLMs are non deterministic. This is the case with any harness including OpenCode. Giving coding harness its own environment (Container/VM) is the best way forward as the article denounces. Running coding agent harness without sufficient guardrails is like sitting on a time bomb. Using AI slop guardrails is still better than having no guardrails.