commit-message

commit-message is a skill for Claude Code, Codex from dentiny/kon. It costs 50 tokens per session (626 once invoked), scanned A, original, MIT.

A guideline for writing short Git commit messages that describe the user-facing change. A commit message is the record attached to a saved set of code changes in Git.

In plain words
What is it for?
Use it when drafting a commit message after changes are staged or proposed, including projects that use Conventional Commits formatting.
Why use it?
It makes project history easier to understand and search without adding review commentary or unnecessary explanation.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it when drafting a commit message after changes are staged or proposed, including projects that use Conventional Commits formatting.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/dentiny/kon/commit-message
View source ↗ dentiny/kon
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.

Any agent
npx skills add dentiny/kon --skill commit-message
Clone the repo
git clone --depth 1 https://github.com/dentiny/kon

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 commit-message

README.md
[![agentmods](https://agentmods.dev/badge/skills/dentiny/kon/commit-message/github.svg)](https://agentmods.dev/skills/dentiny/kon/commit-message)
Your own site
<a href="https://agentmods.dev/skills/dentiny/kon/commit-message"><img src="https://agentmods.dev/badge/skills/dentiny/kon/commit-message/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for commit-message

Your own site · 80×15
<a href="https://agentmods.dev/skills/dentiny/kon/commit-message"><img src="https://agentmods.dev/badge/skills/dentiny/kon/commit-message.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 626 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00050 $0.00626
Opus 5.5 $0.00020 $0.00250
Sonnet 5.5 $0.00010 $0.00125
Haiku 4.5 $0.00005 $0.00063

Measured 1mo ago against content hash 40cacd7ca3f3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

commit-message 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 1mo 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/commit-message/SKILL.md · 67 lines

How it starts

The opening of the file, as written. The whole thing — 67 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Commit Message

Consumers: any task that drafts a commit message after a successful run.

Core principles (always): follow skills/core-principles — subject states user impact concisely; no motivation paragraphs or padding.

Subject rules

  • One line, ≤ 70 chars, user-impact framing — what changes for the user, not which files were touched
  • Verb-first: "Add", "Fix", "Allow", "Reject", "Block"
  • No file names in the subject: "Refactor auth.py" is bad; "Reject empty emails at signup" is good
  • Match existing style: if the repo uses Conventional Commits (type(scope): subject), keep that format; otherwise freeform
    • Detect Conventional Commits: pyproject.toml has [tool.commitizen], or .cz.toml / commitlint.config.js exists

Bad → Good

Bad Good
update auth.py and tests Reject empty emails before hashing
fix bug Stop retry storm on 5xx from upstream
address review comments Enforce non-empty email at signup

Body rules

The body is for the future bisecting engineer, not the current reviewer:

  • ≤ 3 sentences total, or equivalent compact bullets
  • Cover only: what changed at the user-impact level, breaking-change pointers, irreplaceable invariants
  • Cut: "why the problem existed", motivation paragraphs, "why we picked X over Y" — all of that belongs in the PR description
  • If the subject is already complete and nothing durable remains to add, omit the body

Output format

<subject — one line, ≤70 chars, user-impact>

<body — ≤3 sentences; omit entirely if nothing durable to add>

Provide raw text to the caller — do not wrap in a code fence by default (breaks piping to git commit -F -). When presenting to the user as a readable deliverable, wrap in a single fenced code block.

No git commit — ever

Agents never run git commit or git push. The skill produces text only. Present the draft in a fenced code block so the user can copy it and run:

Read the full file on GitHub · 67 lines

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. 1mo ago First seen · 67 lines · 50 tokens per session scan A 40cacd7ca3f3

Subscribe to this mod's changes

commit-message is a skill published in the GitHub repository dentiny/kon (3 stars, last pushed 3mo ago), licensed MIT. It adds 50 tokens to every session and 626 once invoked, about $0.0002 per session on Opus 5.5. 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.