Every Claude Code commit and PR is shipped with Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> (or similar). It's less fun than I think it should be. So signoff.sh is a 40-line bash script that replaces it with a random fictional character's full legal name - as best as I could figure out :)
Preserves the model name and the Anthropic noreply email, so you still get transparency about AI coding.