Xcode builds: 78% faster
Antoine v.d. SwiftLee released six Agent Skills that analyze build logs and auto‑apply fixes — he reports Xcode build times improved by 78% after using them. (x.com) The post has traction: 485 likes and ~52k views, suggesting strong community interest in terminal‑first CI optimizations. (x.com)
The AvdLee repository Xcode-Build-Optimization-Agent-Skill is published as a package of six installable Agent Skills and instructs users to install them with "npx skills add (github.com) Its orchestrator coordinates a benchmark step plus three specialist analyzers — Compilation, Project and SPM — and writes a prioritized optimization plan to.build-benchmark/optimization-plan.md without modifying project files until the user explicitly approves changes. (github.com) The README quantifies developer-time impact with a worked example: shaving 1 second off a 30‑second incremental build saves 3.5 hours per developer per year at 50 builds per day, or 35 hours across a 10‑person team. (github.com) Antoine van der Lee is publishing multiple Agent Skill projects (including SwiftUI and Swift Testing skills) and has been converting SwiftLee content into reusable skills for wider reuse on GitHub and in his SwiftLee newsletters. (github.com) Apple added native agentic coding support in Xcode 26.3, giving agents like Anthropic’s Claude Agent and OpenAI’s Codex access to Xcode tooling and exposing a Model Context Protocol that lets third‑party skills integrate inside the IDE. (apple.com) Community resources have followed: Paul Hudson’s Hacking With Swift published a how‑to for installing and using Agent Skills on March 11, 2026, and recent walkthrough videos demonstrating Agent Skills in Xcode have attracted thousands of views. (hackingwithswift.com) The repository explicitly recommends pairing short‑term skill fixes with long‑term monitoring via RocketSim Build Insights and Team Build Insights and requires re‑benchmarking and verification after the Build Fixer applies changes. (github.com)
