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Squash Commit Message Writer

Reads a PR's net diff and produces one commitlint-passing squash commit message.

Dev & CodingIntermediate★ 578⑂ 72AI score 5/10Last updated: Sep 26, 2026

What it does

  • Computes the branch's net change with git merge-base and writes the message from the final diff, not the commit journey (fixups get folded into the item they amend).
  • Produces a Conventional Commit title type(scope): summary, a skimmable body (up to five bullets, wrapped at 72 columns) and preserves every distinct Co-authored-by: trailer.
  • Writes the message to a temp file and actually verifies it with pnpm exec commitlint --edit, then copies it via pbcopy when available.
  • Encodes changelog safety rules, e.g. never use chore for shipped skill content because release-please drops it.

Who it's for

  • Teams on squash-merge workflows using Conventional Commits, commitlint and release-please.
  • Developers tired of commit bodies full of file inventories and review history.
  • Contributors to the Scenario Labs skills repo (the scope list is repo-specific).

Examples

  1. A PR with a dozen noisy commits: ask for a squash message and get one summary of the net change only.
  2. A PR landing several features: get a feat(skills): ... title plus a tight five-bullet body.
  3. Pairing or agent-assisted work: all Co-authored-by: trailers are collected into the footer.

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/scenario-labs/skills/HEAD/.agents/skills/skills-squash-message/SKILL.md

What I want: (describe your task here)

If Claude can't open the link, open it yourself and paste the contents instead.

↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on Claude Skill Mart.
Copy the .agents/skills/skills-squash-message folder from the GitHub repo scenario-labs/skills into my ~/.claude/skills/skills-squash-message/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/scenario-labs/skills.git && mkdir -p ~/.claude/skills && cp -r skills/.agents/skills/skills-squash-message ~/.claude/skills/

⚠ This is a third-party skill. Check the source repository before installing.

  1. Open a terminal and clone the repo: git clone https://github.com/scenario-labs/skills.git
  2. Create the skills folder: mkdir -p ~/.claude/skills
  3. Copy the skill: cp -r skills/.agents/skills/skills-squash-message ~/.claude/skills/
  4. Restart Claude Code and confirm skills-squash-message appears in your skill list.
  5. For other projects, edit SKILL.md to match your own scopes, drop the AGENTS.md reference, and adjust the pnpm exec commitlint command to your tooling.
  6. On a PR branch, just ask: "write the squash commit message for this PR".
View source on GitHub ↗License: MIT