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.
- skills.sh installs
- 310
- GitHub stars
- 35
- last updated
- Aug 21, 2026
Install
$ npx -y skills add tuist/agent-skills --skill compare-builds --agent claude-codeInstalls into .claude/skills of the current project.
Files
Compare Builds
Quick Start
You'll typically receive two build identifiers (IDs, dashboard URLs, or branch names). Follow these steps:
- Run
tuist build list --jsonto find builds on each branch. - Run
tuist build show <build-id> --jsonfor both base and head builds. - Fetch sub-resource details: targets (
tuist build xcode target list <id> --json), issues (tuist build xcode issue list <id> --json), and cache tasks (tuist build xcode cache-task list <id> --json). - Compare duration, status, cache hit rates, and other metrics.
- Summarize regressions, improvements, and recommendations.
If only one identifier is provided, use the project's default branch as the baseline.
Step 1: Resolve Builds
If base/head are build IDs or dashboard URLs
Fetch each directly:
tuist build show <base-id> --json
tuist build show <head-id> --json
If base/head are branch names
List recent builds on each branch and pick the latest:
tuist build list --git-branch <base-branch> --json --page-size 1
tuist build list --git-branch <head-branch> --json --page-size 1
Then fetch full details with tuist build show <id> --json.
Defaults
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- Repository
- github.com/tuist/agent-skills
- Categories
- DevOps & CI/CD, Git & Pull Requests, AI & Agent Building, Mobile Development
- First seen
- Jun 3, 2026
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