co-authors

A git wrapper to attribute coding agents via Co-Authored-By

Installation

uv tool install git+https://github.com/gelt-technologies/co-authors

Shell Alias Setup

Add the following alias to your shell config (~/.bashrc, ~/.zshrc, etc.):

alias git="co-authors"

Then reload your shell:

source ~/.zshrc  # or ~/.bashrc

With this alias in place, all git commands pass through co-authors transparently. Only git commit gets special handling — everything else is forwarded to the real git binary unchanged.

Usage

Automatic attribution via GIT_AGENT

Set GIT_AGENT to the agent key for automatic Co-Authored-By trailer injection:

GIT_AGENT=claude git commit -m "Add feature"
# Commits with: Co-Authored-By: Claude <noreply@anthropic.com>

For persistent attribution in a session (e.g. inside a Claude Code session), export the variable:

export GIT_AGENT=claude
git commit -m "Add feature"

Interactive agent selection

When GIT_AGENT is not set and no -m message is provided, co-authors prompts you to select an agent interactively:

git commit
# Displays a selection prompt: claude, codex, cursor, or None

Inline agent flag

Use --agent to specify the agent for a single commit without setting GIT_AGENT:

git commit -m "Add feature" --agent claude
git commit -m "Add feature" --agent=claude

This also overrides GIT_AGENT if it is already set.

Bypassing attribution

Use --me to skip trailer injection entirely — useful when GIT_AGENT is exported but a particular commit is your own work:

git commit -m "Fix typo" --me

Pass-through behaviour

If -m is provided but GIT_AGENT is not set and --agent is not used, the commit proceeds without any trailer — no prompt is shown.

All non-commit subcommands are passed through unchanged:

git status    # forwarded directly to git
git push      # forwarded directly to git

Supported Agents

Agent key	Co-Authored-By trailer
claude	Claude <noreply@anthropic.com>
codex	Codex <codex@openai.com>
cursor	Cursor <cursoragent@cursor.com>

Behaviour Matrix

-m flag	GIT_AGENT set	--me	--agent	Behaviour
yes	yes	no	no	Append trailer via --trailer (unless already present)
yes	no	no	no	Pass through unchanged
no	yes	no	no	Append trailer via --trailer
no	no	no	no	Interactive prompt to select an agent (or none)
any	any	yes	no	Pass through unchanged (no trailer)
any	any	no	set	Append trailer for the given agent (overrides env)

Trailers are never duplicated — if the same Co-Authored-By value is already present, it is not added again.