HERMES.md in git commits triggers extra billing in Claude Code

A bug report filed against the `anthropics/claude-code` GitHub repository describes a billing anomaly where the presence of the string `HERMES.md` in git commit messages causes Claude Code to route API requests to extra usage billing rather than the user's included plan quota. The reporter states this silently consumed $200 in extra usage credits while their Max 20x plan capacity remained largely untouched at 13% weekly usage. The issue is case-sensitive — lowercase `hermes.md` in a commit message does not trigger the behavior — and the bug reproduces without any project files beyond a single git commit containing the string. Claude Code includes recent commits in its system prompt, and something server-side appears to route requests differently when `HERMES.md` is present.