write-changeset

name	write-changeset
description	Write or update a change set (changeset) file for a pull request or branch, and scaffold the repo-local changeset workflow when it is missing. Use when the user says to write, add, update, or run the change set or changeset for a PR/branch before merge.
license	MIT
metadata	{"version":"0.1.0"}

Write Change Set

Use this skill when the user wants the PR or branch to carry a changeset before merge.

First Checks

1. Read repo instructions such as AGENTS.md, CLAUDE.md, and release docs.
2. Detect existing workflow files: .changeset/, CHANGELOG.md, package scripts, release scripts, PR template, and tests.
3. Inspect the branch or PR diff before writing anything.
4. If the workflow already exists, follow the repo's local commands and file format.

Normal Workflow

1. Find an existing branch-local .changeset/*.md file. Update it when it belongs to this PR.
2. If none exists and the PR needs one, create exactly one pending changeset file.
3. Choose the smallest defensible type: major, minor, or patch.
4. Choose the changelog category used by the repo, usually Added, Changed, Deprecated, Removed, Fixed, Security, Migration Notes, App Author Notes, Known Issues, or Upgrade Notes.
5. Write the note in user-facing language describing the final result of the PR.
6. Run the repo's changeset validation command, such as pnpm changeset:check-pr.

Boundaries

• Do not edit CHANGELOG.md.
• Do not bump versions.
• Do not move files into .changeset/released/.
• Do not create tags, pushes, or GitHub Releases.
• If the PR does not need a changeset, say that directly and explain the reason.

Missing Workflow

If the repo does not have a changeset workflow, stop and offer to scaffold it. Do not scaffold without user approval.

When approved, read references/scaffold-workflow.md and use the bundled templates/assets if they fit the repo. Before installing the bundled CLI, inspect whether the target repo meets its assumptions (ES modules, an origin/main base branch, and tab-indented package.json), adapt when the right change is clear, and ask only when compatibility requires a user choice.

References

• For file format rules, read references/changeset-format.md.
• For bootstrap instructions, read references/scaffold-workflow.md.
• For prompt and output examples, read references/examples.md.