HERMES.md 是 Nous Research 旗下开源 AI Agent 项目 hermes-agent 在 GitHub 上的标识性文件名，普遍认为 Anthropic 服务端用此字符串作为反向代理与第三方 Agent 的指纹检测特征，但实现上把"内容过滤拒绝"误分类为"配额耗尽"错误。复现路径极简：git init → git commit -m "HERMES.md" → 调用 Claude Code 即可触发 400 错误；删除 .git/ 目录或用 git filter-repo 改写历史 commit message 中的该字符串可立即解除。两个相关 Issue（#53171、#53262）均已在仓库内被官方标记为"has repro"状态，内含详细复现步骤，但截至 4 月 27 日尚未发布修复，受影响用户的退款请求据中文社区报道遭官方拒绝。Issue 提交者呼吁 Anthropic 至少应当返回独立的 content_filter_rejected 错误类型，而非错误地将其归为账单问题。

GitHub Issue #53171 | GitHub Issue #53262

[BUG] Literal "HERMES.md" in git commit messages triggers 400 "out of extra usage" on Max OAuth (content filter false-positive misclassified as quota error) · Issue #53171 · anthropics/claude-code

Summary A literal HERMES.md string (uppercase + dot + md, case-sensitive) appearing anywhere in git log of the current working directory causes Claude Code on a Claude Max OAuth plan to return: API Error: 400 {"type":"error","error":{"ty...

GitHub (github.com)

HERMES.md in git commit messages causes requests to route to extra usage billing instead of plan quota · Issue #53262 · anthropics/claude-code

Summary When a git repository's recent commit history contains the case-sensitive string HERMES.md, Claude Code routes API requests to "extra usage" billing instead of the included Max plan quota. This silently burned through $200 in ext...

GitHub (github.com)