Spfx Release is an agent skill from pnp/docker-spfx. Automate SPFx version releases - branch, update files, commit, open PR, then tag after merge
Its SKILL.md is about 570 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Documents & Office, covering Cloud office suites and Containers. It works with Microsoft 365, Docker, Microsoft SharePoint and Git. The repository describes itself as: Docker images for working with SharePoint Framework. The licence is MIT.