Compare Builds

This automates the tedious work of comparing Xcode build performance between branches or commits. You feed it two build IDs, dashboard URLs, or branch names, and it pulls down build metrics, target details, cache statistics, and issues to give you a proper regression analysis. It's especially useful for catching cache invalidation cascades, where one module change blows the cache for a dozen downstream targets and tanks your build time. The summary format is thoughtful, showing duration changes, cache hit rate deltas, and actionable recommendations rather than just dumping JSON at you. If you're on a large iOS project and trying to keep CI times reasonable, this beats manually diffing build logs.

Install to Claude Code

npx -y skills add tuist/agent-skills --skill compare-builds --agent claude-code