commit-hygiene

A set of rules for making focused Git commits, where each commit records one logical change in project history.

In plain words
What is it for?
It helps stage related files separately and write clear conventional commit messages that explain the reason for the change.
Why use it?
It keeps unrelated work from being mixed together and makes changes easier to review or undo.

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/buildmoonshot/skillpacks/commit-hygiene
Any agent
npx skills add buildmoonshot/skillpacks --skill commit-hygiene
Clone the repo
git clone --depth 1 https://github.com/buildmoonshot/skillpacks

Made for: Claude Code, Codex.

Per session 54 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 381 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 $0.00054 $0.00381
Opus 5 $0.00027 $0.00191
Sonnet 5 $0.00011 $0.00076
Haiku 4.5 $0.00005 $0.00038

Measured 2d ago against content hash 4a9ef9f78ba3, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

commit-hygiene 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 2d 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.

skills/engineering/intermediate/commit-hygiene/SKILL.md · 36 lines

What it actually says

Commit Hygiene

A commit is a unit of history someone will read later. Make each one tell a clear, single story.

One logical change per commit

  • Don't bundle unrelated work ("fix bug + rename files + add feature") into one commit. Split it. Each commit should be revertable on its own without dragging unrelated changes with it.
  • If you changed several things, stage and commit them separately by concern.

Write a message that explains why

Use a conventional, scannable format:

<type>: <short imperative summary>

<optional body: why this change, not what — the diff already shows what>
  • type: fix, feat, refactor, docs, test, chore (match the repo's existing convention if it has one).
  • summary: imperative mood, ~50 chars, no trailing period: fix: prevent crash on empty cart, not fixed some stuff.
  • body (when it adds value): explain the reasoning, the tradeoff, or the context a future reader won't have. Skip it for trivial changes.

Match the repo

If the project already uses a commit style (check git log), follow it over these defaults. Consistency beats your personal preference.

Why this matters

git log is documentation that writes itself — but only if commits are clean. Focused commits make bugs bisectable, reverts safe, and reviews fast. A history of vague "update" commits is a history nobody can use.

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 2d ago First seen · 36 lines · 54 tokens per session scan A 4a9ef9f78ba3

Subscribe to this mod's changes

commit-hygiene is a skill published in the GitHub repository buildmoonshot/skillpacks (2 stars, last pushed 2mo ago), licensed MIT. It adds 54 tokens to every session and 381 once invoked, about $0.0003 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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