HERMES.md in commit messages causes requests to route to extra usage billing

Git 提交信息中的 HERMES.md 导致请求被错误计入额外使用费而非套餐配额

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 extra usage credits while my Max 20x plan capacity remained largely untouched (13% weekly usage).

摘要

当 Git 仓库的近期提交历史中包含区分大小写的字符串 HERMES.md 时，Claude Code 会将 API 请求路由至“额外使用费”（extra usage）计费，而非扣除已包含的 Max 套餐配额。这导致我的 200 美元额外使用额度在不知不觉中被耗尽，而我的 Max 20x 套餐容量却几乎未被使用（每周仅消耗 13%）。

Environment

Claude Code v2.1.119
macOS (Apple Silicon)
Max 20x plan ($200/month)
Model: claude-opus-4-6[1m] (also reproduces with claude-opus-4-7)

环境

Claude Code v2.1.119
macOS (Apple Silicon)
Max 20x 套餐（200 美元/月）
模型：claude-opus-4-6[1m]（在 claude-opus-4-7 中同样可复现）

Reproduction

The trigger is the string HERMES.md in git commit messages — not the presence of a file with that name on disk. Claude Code includes recent commits in its system prompt, and something server-side routes the request differently when this string is present.

复现步骤

触发该问题的关键在于 Git 提交信息中包含字符串 HERMES.md，而非磁盘上存在同名文件。Claude Code 会将近期提交记录包含在系统提示词（system prompt）中，而服务器端在检测到该字符串时，会以不同的方式路由请求。

Impact

$200.98 in extra usage credits consumed for requests that should have been covered by the included Max 20x plan quota.
Multiple projects became completely unusable once extra usage was depleted, while the plan dashboard showed 86%+ remaining weekly capacity.
The error message (“out of extra usage”) gives no indication that content-based routing is the cause, making this extremely difficult to diagnose.
Any user with HERMES.md in recent git commits would silently have their usage billed to extra credits.

影响

本应由 Max 20x 套餐配额覆盖的请求，导致了 200.98 美元的额外使用费扣除。
一旦额外额度耗尽，多个项目便完全无法使用，尽管套餐仪表盘显示每周配额仍有 86% 以上的剩余。
错误提示（“out of extra usage”）未提供任何关于“基于内容路由”导致问题的线索，使得该问题极难排查。
任何在近期 Git 提交中包含 HERMES.md 的用户，其使用量都会在不知情的情况下被计入额外额度。

Expected behavior

API request billing should not depend on the content of git commit messages in the system prompt. All requests from a Max plan subscriber should route to the included plan quota first.

预期行为

API 请求的计费不应依赖于系统提示词中 Git 提交信息的内容。所有来自 Max 套餐订阅者的请求应优先路由至套餐配额。

How I found this

Systematic binary search: cloning affected repos, testing orphan branches, then isolating individual commit message strings until HERMES.md was identified as the exact trigger.

排查过程

系统性的二分查找：克隆受影响的仓库，测试孤立分支（orphan branches），然后逐一隔离提交信息字符串，最终确定 HERMES.md 是导致问题的确切触发点。