pre-release
- Use it when:
- You're about to release a package that records its changes with Changesets.
- It does:
- Checks every file in .changeset and fixes what fails: only user-facing changes, related ones under one changeset, no implementation details.
- You get:
- Changesets that read as release notes for users, in a new commit.
- Unlike changeset pre:
- That command puts a package in pre-release mode for alpha or beta versions; this skill only checks the changeset files.
- Runs:
- Only when you invoke it.
TL;DR
Changesets is a release tool where each change to a package is described in a small Markdown file in the .changeset directory, and those files become the package's release notes. This skill has the agent check and fix them before a release. Each changeset should be about a feature users notice: internal refactors get none. Related changes belong under one changeset. And each should say what changed for users and why, not how it was built, because changesets aren't commit messages. When it's done, the agent commits its changes. It comes from Sandcastle, Matt Pocock's CLI for running agents in sandboxes, but works in any repo that uses Changesets.
Summarizes the skill at 049bb4d.
npx skills add https://github.com/mattpocock/sandcastle --skill pre-release skills.sh pageSource on GitHubAll skills from mattpocock/sandcastle
- Total Downloads
- 40 on skills.sh, Nov 9, 2026
- First seen
- Apr 29, 2026 on skills.sh
Weekly values
| Week to | Installs |
|---|---|
| Sep 21 | 1 |
| Sep 28 | 3 |
| Oct 5 | 1 |
| Oct 12 | 4 |
| Oct 19 | 0 |
| Oct 26 | 1 |
| Nov 2 | 0 |
| Nov 9 | 1 |
| Category |
Test-first work, implementation from specs, git hygiene and scope control. Articles, docs, internal comms, research write-ups and prose that doesn't read as generated. Everything for building software: planning, coding, debugging, design, frameworks, cloud, agents and skills. |
|---|---|
| Type |
A one-shot action you invoke by name, such as turning the conversation into a PRD. |
| Effect |
Its own steps create or change files, git state or local tools. |
| Needs |
Instructions only. Works in any agent that supports skills. |
| Publisher |
Everyone else. Unverified vendor claims default to community. |
| Topics | |
| Stack |
SKILL.md
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