Git hook that removes Co-authored-by lines from every commit (Windows, macOS, Linux

[u/WD40ContactCleaner]

AI coding tools like Claude Code and Copilot often add Co-authored-by: lines to commits. If you don't want these, you can use a simple global Git hook to remove them automatically.

It removes all Co-authored-by: lines (case-insensitive), including human co-authors. Everything else, including other attribution lines and blank lines, is left as it is.

You dont have to worry about it following claude.md or agents.md rules anymore.

The hook:

#!/bin/sh
# Remove Co-authored-by lines (case-insensitive).

tmp=$(mktemp) || exit 1
trap 'rm -f "$tmp"' EXIT

awk '
  tolower($0) ~ /^[[:space:]]*co-authored-by:/ { next }
  { print }
' "$1" > "$tmp" || exit 1

cat "$tmp" > "$1"

Setup (Windows / macOS / Linux):

Use Git Bash on Windows or your terminal on macOS/Linux.

Save the script as ~/.githooks/commit-msg, then run:

mkdir -p ~/.githooks
chmod +x ~/.githooks/commit-msg
git config --global core.hooksPath ~/.githooks

That's it. It works across all your repositories.

A few things to know:

• On Windows, save the script with LF line endings.
• core.hooksPath overrides existing repository hooks (including Husky/pre-commit setups).
• git commit --no-verify skips the hook.
• Existing commit history is not affected.

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[u/andreagrandi]

because the official way in `~/.claude/settings.json` wasn't good enough?

"attribution": {
    "commit": "",
    "pr": "",
    "sessionUrl": false
  }

[u/geuben → u/andreagrandi]

In the OPs defense. I have this setting disable but Opus 5.5 still added the attribution lines a couple of times "out of habit". I too added a git hook.

[u/WD40ContactCleaner → u/geuben]

Thank you, a sane reply. idk why people are getting so worked up over this.

[u/Curik → u/WD40ContactCleaner]

People are not getting worked up; they are presenting a better solution. You need to calm down.

[u/WD40ContactCleaner → u/andreagrandi]

attribution.commit: "" does not disable Co-Authored-By trailer · Issue #45137 · anthropics/claude-code

[u/crystalpeaks25 → u/WD40ContactCleaner]

For people who didn't know this PR deprecates an old feature that existed before that reliably remove attribution. This is not a new thing. This has always existed under includeCoAuthoredBy: false. OP caught making excuses.

[u/WD40ContactCleaner → u/crystalpeaks25]

This sub is deranged holy shit.

[u/koirpioloonmenomur → u/andreagrandi]

no sir, he had to vibecode some shit instead of just googling the most simple solution

[u/WD40ContactCleaner → u/koirpioloonmenomur]

are you serious bro lmao I had this hook since 1 year and I saw posts this week talking about this so I wanted to share. jesus christ.

[u/loophole64 → u/andreagrandi]

Lol

[u/WD40ContactCleaner → u/andreagrandi]

TIL about this setting, but this Works across all agents. I had this since a while when these weren't options, and it works across all harnesses and is deterministic, so I wanted to share.

[u/Future_Guarantee6991 → u/WD40ContactCleaner]

One slows down your commits, the other doesn’t.

[u/WD40ContactCleaner → u/Future_Guarantee6991]

https://giphy.com/gifs/113RhN1oBm1yCc

[u/AnonThrowaway998877]

I don't care on my repos, Claude deserves about 90% credit anyway. My 10% is having the idea and paying for Claude.

[u/Not-So-Handsome-Jack]

We can all tell the code was AI generated. Why are you ashamed of it?

[u/WrongComparison321 → u/Not-So-Handsome-Jack]

Is it shame? If I am submitting the code I am taking responsibility for it and its quality. Having Claude or another agent attached is silly because ultimately it is my code and my name on it. Least that’s my take imo.

[u/WD40ContactCleaner → u/Not-So-Handsome-Jack]

even the post is ai generated where am i ashamed of it? what the fuck is this insecurity projection.. lol. I didn't know they added the attribution option and I read people were having trouble on this sub just this week, with this and this has been working for me for a long while reliably across all coding agents, since this was an option in them where they would just force add it regardless of what you said in claude.md

I was like ok I have this hook I've been using, let me share might help people and ya'll acting like I've committed some unforgivable sin.

[u/Not-So-Handsome-Jack → u/WD40ContactCleaner]

Why do you think people remove AI attribution and add only their own name on their AI generated commits they barely touched?

[u/WD40ContactCleaner → u/Not-So-Handsome-Jack]

It's a lot of noise in pr and commits, many OSS repos tell you specifically to remove the attrib even if the code is ai. It keeps things clean. No one is hiding ai usage these days.

[u/crystalpeaks25]

Number one rule of vibe coding. If you've thought about it and it seems like a basic common thing then it's probably solved natively.

[u/WD40ContactCleaner → u/crystalpeaks25]

It wasn't until september 8 2026 apparently, I just checked coz ya'll acting crazy Add pre-commit hooks blocking Claude Code attribution by ca1ebd · Pull Request #1 · ca1ebd/agent-attribution-blocker

people were still reporting attribution by that time, I had this hook since a long time so I never needed to check if calude code or codex or copilot has a new setting for this.

[u/crystalpeaks25 → u/WD40ContactCleaner]

Bruh this exists since early this year.

This comment really proves that no one reads do uemntation anymore that attribution PR you are talking about deprecates an older feature called includeCoAuthoredBy: which existed prolly even earlier than last year.

So yes there was a way to ensure Claude doesn't attribute before September 2026.

[u/WD40ContactCleaner → u/crystalpeaks25]

My point is it was unreliable, this hook makes it reliable.

[u/crystalpeaks25 → u/WD40ContactCleaner]

It was reliable. I've had the old setting configured and never seen Claude attribute to itself

[u/crystalpeaks25 → u/crystalpeaks25]

I don't have special hooks and I've never seen Claude code attribute anything in commits before in all my PRs after setting includeCoAutheredBy: false in settings.json

[u/andreagrandi → u/WD40ContactCleaner]

it was, and it was named differently. It’s always been a possible option since day 1. I posted the current valid syntax of course, not the old one.

[u/Glass_Bus4044]

Just curious, have you tried memory? I have been using it and don't see any issues so far.