# Xcode Compilation Analyzer

Analyze Swift and mixed-language compile hotspots using build timing summaries and...

- Repository: https://github.com/AvdLee/Xcode-Build-Optimization-Agent-Skill (1268 stars)
- Category: Design
- License: MIT
- Last updated: 2026-09-14
- Runs scripts: yes, review before use

## Install

Claude Code: `npx skills add AvdLee/Xcode-Build-Optimization-Agent-Skill --skill xcode-compilation-analyzer -g -a claude-code -y`
Codex: `npx skills add AvdLee/Xcode-Build-Optimization-Agent-Skill --skill xcode-compilation-analyzer -g -a codex -y`
Cursor: `npx skills add AvdLee/Xcode-Build-Optimization-Agent-Skill --skill xcode-compilation-analyzer -g -a cursor -y`
Gemini CLI: `npx skills add AvdLee/Xcode-Build-Optimization-Agent-Skill --skill xcode-compilation-analyzer -g -a gemini-cli -y`
Claude Code plugin marketplace: `/plugin marketplace add AvdLee/Xcode-Build-Optimization-Agent-Skill`

## Description

Analyze Swift and mixed-language compile hotspots using build timing summaries and Swift frontend diagnostics, then produce a recommend-first source-level optimization plan. Use when a developer reports slow compilation, type-checking warnings, expensive clean-build compile phases, long CompileSwiftSources tasks, warn-long-function-bodies output, or wants to speed up Swift type checking.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# Xcode Compilation Analyzer

Use this skill when compile time, not just general project configuration, looks like the bottleneck.

## Core Rules

- Start from evidence, ideally a recent `.build-benchmark/` artifact or raw timing-summary output.
- Prefer analysis-only compiler flags over persistent project edits during investigation.
- Rank findings by expected **wall-clock** impact, not cumulative compile-time impact. When compile tasks are heavily parallelized (sum of compile categories >> wall-clock median), note that fixing individual hotspots may improve parallel efficiency without reducing build wait time.
- When the evidence points to parallelized work rather than serial bottlenecks, label recommendations as "Reduces compiler workload (parallel)" rather than "Reduces build time."
- Do not edit source or build settings without explicit developer approval.

## What To Inspect

The rest: https://github.com/AvdLee/Xcode-Build-Optimization-Agent-Skill/blob/HEAD/skills/xcode-compilation-analyzer/SKILL.md