Claude Code Found Injecting Hidden Prompt to Force Co-Author Attribution

Reddit users discovered that Claude Code's latest version injects a hidden server-side prompt forcing Co-Authored-By: Claude attribution in commits and PRs, overriding CLAUDE.md rules. The behavior appears in v2.1.257 but not 2.1.252, and can be manually disabled.

2026-09-03 ~ 2026-09-03 · 3 related posts

• Claude Code 2.1.257 injects server-side Co-Authored-By reminders into sessions, here's the fix — DriverSudden4026 · 2026-09-03
• Users report Claude harness overrides CLAUDE.md to force Git co-authorship — Winter_Simple_159 · 2026-09-03
• Claude Code caught embedding attribution prompt that overrides users' claude.md settings — iDominikos · 2026-09-03