Developer shares git hook script to automatically block LLM co-author signatures from sneaking into commit history

LLMs frequently append 'Co-authored-by: [AI Name]' tags to commit messages, which persist even when explicitly prompted to avoid them

Context drift and new LLM sessions make it difficult to prevent these signatures from appearing through prompting alone

A simple bash git hook using grep can automatically reject any commits containing 'co-authored-by' text before they reach the codebase

This approach shifts responsibility from LLM prompt engineering to automated enforcement at the git level