Summary & Key Takeaways ​

• uvx can be made cache-friendly in GitHub Actions by setting UV_EXCLUDE_NEWER.
• This environment variable pins tool versions to a specific date, improving cache hit rates.
• The date can be included in the GitHub Actions cache key to bust the cache when needed.
• The primary goal is to avoid re-downloading Python tools and their dependencies from PyPI on every workflow run.
• An existing issue requests setup-uv to default to caching rather than purging wheels.

Our Commentary ​

I've seen so many CI pipelines struggle with dependency resolution and caching. This UV_EXCLUDE_NEWER trick for uvx is genuinely smart. It's a simple, effective pattern that I think could be adapted for other package managers too. We're always looking for ways to shave seconds off builds, and this is a solid win for developer experience.