commit-msg

A guide for creating a Git commit message from the changes currently in a Git project. Conventional commits are a shared format such as “fix: handle empty input.”

In plain words
What is it for?
Use it when deciding what commit message to write or preparing changes for a commit; it does not create the commit.
Why use it?
It helps describe changes clearly without manually checking every diff, file status, and recent commit for the project’s style.

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/jenreh/appkit/commit-msg
Any agent
npx skills add jenreh/appkit --skill commit-msg
Clone the repo
git clone --depth 1 https://github.com/jenreh/appkit

Made for: Claude Code, Codex.

Per session 42 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 384 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 $0.00042 $0.00384
Opus 5 $0.00021 $0.00192
Sonnet 5 $0.00008 $0.00077
Haiku 4.5 $0.00004 $0.00038

Measured yesterday against content hash 038979ade4bd, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

commit-msg 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 yesterday.

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.

.claude/skills/commit-msg/SKILL.md · 66 lines

What it actually says

Commit Message

Generate a commit message for the current changes. Do NOT run git commit.

Step 1 — gather context

Run these in parallel:

git diff --staged
git diff
git status --short
git log --oneline -10

Step 2 — choose the diff scope

  • If there are staged changes (git diff --staged is non-empty), use those.
  • Otherwise fall back to all unstaged changes (git diff).
  • If both are empty, report "nothing to commit" and stop.

Step 3 — generate the message

Follow the project's conventional commits style observed from git log:

<type>(<optional scope>): <short imperative summary>

<optional body — only when the why is non-obvious>

Types: feat, fix, refactor, chore, docs, test, perf

Rules:

  • Summary line ≤ 72 characters, lowercase, no trailing period.
  • Imperative mood: "add", "fix", "remove" — not "added" or "fixes".
  • Body only when the diff contains a non-obvious motivation or breaking change.
  • If the diff spans multiple unrelated concerns, say so and suggest splitting.

Step 4 — output

Present the message in a code block, ready to copy:

<generated message here>

Then add one line explaining the type choice if it wasn't obvious.

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. yesterday First seen · 66 lines · 42 tokens per session scan A 038979ade4bd

Subscribe to this mod's changes

commit-msg is a skill published in the GitHub repository jenreh/appkit (4 stars, last pushed 5d ago), licensed MIT. It adds 42 tokens to every session and 384 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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