commit-msg

A skill that writes a short English Git commit message from the complete staged and unstaged change set. A commit message is the brief record attached to a saved version of code.

In plain words
What is it for?
For generating commit subjects and short explanatory bullet points before committing, after solving a task, or when explicitly requested.
Why use it?
It removes the effort of inspecting a diff and turning it into a concise summary that follows the project’s message rules.

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

Made for: Claude Code, Codex.

Per session 45 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 322 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 $0.00045 $0.00322
Opus 5 $0.00023 $0.00161
Sonnet 5 $0.00009 $0.00064
Haiku 4.5 $0.00005 $0.00032

Measured 2d ago against content hash 613df91531c9, 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 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.

plugins/developer/skills/commit-msg/SKILL.md · 30 lines

What it actually says

Generate a concise commit message in English based on the full git diff (both staged and unstaged changes).

Pre-commit:

  1. Run make fmt lint before analyzing the diff. If it produces changes or errors, fix them first.

Rules (based on https://cbea.ms/git-commit/):

  1. Run git diff and git diff --cached to see all changes
  2. Subject line: max 50 chars, capitalize, no period at end
  3. Use imperative mood ("Add", "Fix", "Remove", not "Added", "Fixed")
  4. Add ticket prefix from branch name if present (e.g. PLF-852)
  5. Separate subject from body with a blank line
  6. Body: bullet points summarizing what and why (not how), wrap at 72 chars
  7. Group related changes together, mention bug fixes with "Fix"
  8. Output only the commit message, nothing else

Example:

PLF-819 Add user validation for order creation

- Add email format and phone length validation in pkg/vt/order.go
- Fix missing nil check for optional DeliveryAddress field
- Update OrderSearch with new CreatedAtFrom/CreatedAtTo filters
- Regenerate zenrpc and mfd-model after schema changes
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 · 30 lines · 45 tokens per session scan A 613df91531c9

Subscribe to this mod's changes

commit-msg is a skill published in the GitHub repository vmkteam/claude-plugins (7 stars, last pushed 4mo ago), licensed MIT. It adds 45 tokens to every session and 322 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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