commit

A skill for writing conventional descriptions of jj, or Jujutsu, changesets in the user's voice. Conventional commit messages follow an agreed structure so a project's history is easier to scan.

In plain words
What is it for?
Use it when describing or committing session changes in a jj repository, including reviewing the relevant status, diff, history, and commit template.
Why use it?
Writing clear change descriptions takes time, and assistant-generated attribution may not belong in your project history. This skill focuses the description on the user's work and follows configured 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/jeffh/claude-plugins/commit
Any agent
npx skills add jeffh/claude-plugins --skill commit
Clone the repo
git clone --depth 1 https://github.com/jeffh/claude-plugins

Made for: Claude Code, Codex.

Per session 105 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 611 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 $0.00105 $0.00611
Opus 5 $0.00053 $0.00305
Sonnet 5 $0.00021 $0.00122
Haiku 4.5 $0.00011 $0.00061

Measured 2d ago against content hash 0171439118fa, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

commit 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.

jj/skills/commit/SKILL.md · 70 lines

What it actually says

Commit Changes with Jujutsu

Write jj change descriptions for work done during this session, as if the user wrote them. NEVER add co-author information or Claude attribution.

Usage

  • Describe the working copy (@) and any undescribed parent commits.
  • If a revset is provided, describe only the specified revision(s), without splitting or modifying other commits.

Context expectations

When invoked from /jj:commit, the working-copy status, full diff, the undescribed-change list, recent log, and any configured commit template are already in context. Do not re-run them.

If invoked directly without that context, gather it first:

jj status --no-pager
jj diff --no-pager
jj log --no-pager -r 'trunk()..@ & description(exact:"")' -T 'change_id ++ "\n"'

Run jj diff --no-pager -r '<change_id>' for each undescribed commit, including parents. If a revset was provided, use jj log --no-pager -r '<revset>' and diff each commit instead.

Honor commit templates

If a commit-message template is configured — templates.draft_commit_description (jj) or commit.template (git) — follow its structure and section headings. Otherwise, match the style of recent log messages.

Message format

<type>: <subject>

[optional body]

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

Rules:

  • Subject: imperative mood, lowercase, no period, max 50 chars
  • Body: wrap at 72 chars, explain WHY not just WHAT
  • Group related changes logically
  • Keep changes focused and atomic

Apply descriptions

jj describe -m "message"              # current change (@)
jj describe -r <change_id> -m "msg"   # specific revision

To split into multiple changes (only when no revset provided):

jj split -m "first message" path/to/files/
jj split -m "second message" more/files/
jj describe -m "remaining changes"

Show results

jj log --no-pager -r 'ancestors(@, 5)'
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 · 70 lines · 105 tokens per session scan A 0171439118fa

Subscribe to this mod's changes

commit is a skill published in the GitHub repository jeffh/claude-plugins (12 stars, last pushed 17d ago), licensed Apache-2.0. It adds 105 tokens to every session and 611 once invoked, about $0.0005 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 2026-08-30.

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