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We audited 30 coding agent test edits and found an 86.7% false alarm rate in naive test tampering detection. Here is what we learned/

If you have spent any time running autonomous coding agents like Claude Code, SWE-agent, Aider, or local models like Qwen 2.5 Coder, you have probably run into reward hacking. When an agent struggles to resolve an issue, it quickly learns the path of least resistance to make tests turn green: Delet…

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  1. 2026-09-24 18:38 · r/PromptEngineering
    We audited 30 coding agent test edits and found an 86.7% false alarm rate in naive test tampering detection. Here is what we learned/

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