co-author

co-author is a skill for Claude Code, Codex from agentconfig/agentconfig.org. It costs 33 tokens per session (379 once invoked), scanned A, original, ISC.

A coding guideline for adding human co-author credits to Git commit messages when another contributor helped with the work.

In plain words
What is it for?
It helps identify approved contributors and add Co-authored-by lines when pair programming or collaborating.
Why use it?
It prevents incorrect attribution and gives collaborators credit in the standard Git format.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/agentconfig/agentconfig.org/co-author
Any agent
npx skills add agentconfig/agentconfig.org --skill co-author
Clone the repo
git clone --depth 1 https://github.com/agentconfig/agentconfig.org

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for co-author

README.md
[![agentmods](https://agentmods.dev/badge/skills/agentconfig/agentconfig.org/co-author.svg)](https://agentmods.dev/skills/agentconfig/agentconfig.org/co-author)
Your own site
<a href="https://agentmods.dev/skills/agentconfig/agentconfig.org/co-author"><img src="https://agentmods.dev/badge/skills/agentconfig/agentconfig.org/co-author.svg" alt="Measured on agentmods" height="20"></a>
Per session 33 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 379 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00033 $0.00379
Opus 5 $0.00016 $0.00189
Sonnet 5 $0.00007 $0.00076
Haiku 4.5 $0.00003 $0.00038

Measured 3d ago against content hash 1d64117f716a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

co-author scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.github/skills/co-author/SKILL.md · 49 lines

What it actually says

Co-Author Attribution

Contributors

Name Aliases Git Trailer
Jonathan Hoyt jon, jonathan, jonmagic Jonathan Hoyt <[email protected]>
Francis Brero francis, francisfuzz francisfuzz <[email protected]>

How to Add Co-Authors

Add a Co-authored-by: trailer at the end of commit messages:

feat(hero): update tagline

Co-authored-by: francisfuzz <[email protected]>

Multiple Co-Authors

For multiple collaborators, add separate lines:

feat(comparison): redesign provider matrix

Co-authored-by: francisfuzz <[email protected]>
Co-authored-by: Jonathan Hoyt <[email protected]>

Rules

  1. Only human contributors - Never add AI agents as co-authors
  2. Use exact format - Co-authored-by: Name <email>
  3. Verify contributor - Only use emails from the contributors table above
  4. Add when appropriate - When someone contributed ideas, review, or code

When NOT to Add Co-Authors

  • Solo work with no collaboration
  • AI-assisted coding (the AI is not a co-author)
  • Minor suggestions from code review (use PR attribution instead)
  • Rebasing or cherry-picking others' commits (original authorship preserved)
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago First seen · 49 lines · 33 tokens per session scan A 1d64117f716a

Subscribe to this mod's changes

co-author is a skill published in the GitHub repository agentconfig/agentconfig.org (8 stars, last pushed 6d ago), licensed ISC. It adds 33 tokens to every session and 379 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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