A peculiar bug in Anthropic's Claude Code has been discovered, where including the specific string "HERMES.md" in a Git commit message causes API requests to be billed under an "extra usage" category instead of the user's existing plan quota. This issue led one user to incur an unexpected $200.98 charge, rendering their projects unusable while their plan dashboard showed ample remaining capacity. The bug appears to be triggered by the commit message content itself, not the presence of a file named HERMES.md, and is difficult to diagnose due to misleading error messages. AI
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IMPACT Unexpected billing issues could deter adoption of AI coding assistants if not promptly addressed.
RANK_REASON A specific bug in a product that causes unexpected billing and is difficult to diagnose.