Agent skill · software engineering · charleswiltgen
axiom-build
Use when ANY iOS build fails, test crashes, Xcode misbehaves, or environment issue occurs before debugging code. Covers build failures, compilation errors, dependency conflicts, simulator problems, environment-first diagnostics.
Why this skill is useful
Adds executable scripts for diagnosing and resolving Xcode build and environment issues that aren't covered in public documentation.
What it needs
Requires xcode installed locally. About 9k tokens when loaded. Last updated 2026-08-06. 1,103 stars on the source repository.
What this skill does
Build & Environment You MUST use this skill for ANY build, environment, or Xcode-related issue before debugging application code. <!-- AXIOMAUDITORINLINEBEGIN — rewritten for Codex by scripts/build-codex.ts; do not hand-edit --> Auditors are skills here. Where this router says "Launch some-auditor agent", invoke the matching Codex skill instead — same procedure, no Claude Code agent required. Available: axiom-modernize, axiom-scan-security-privacy. The ones that shell out — builds, tests, simulators, crash symbolication — need shell access to run. <!-- AXIOMAUDITORINLINEEND --> When to Use Use this router when you encounter: Build failures (BUILD FAILED, compilation errors, linker errors) Test crashes or hangs Simulator issues (won't boot, device errors) Xcode misbehavior (stale builds, zombie processes) Dependency conflicts (CocoaPods, SPM) Build performance issues (slow compilation) Environment issues before debugging code Routing Logic This router invokes specialized skills based on the specific issue: 1. Environment-First Issues → xcode-debugging Triggers: BUILD FAILED without obvious code cause Tests crash in clean project Simulator hangs or won't boot "No such module" after SPM changes Zombie xcodebuild processes Stale builds (old code still running) Clean build differs from incremental build Device Hub / predicted-vs-built issues in Xcode 27 (OS27) Reproducing a device-only bug on a simulator (Device Hub) (OS27) Why xcode-debugging first: 90% of mysterious issues are environment, not code. Check this BEFORE debugging code. Invoke: skills/xcode-debugging.md --- 2. Slow Builds → build-performance Triggers: Compilation takes too long Type checking bottlenecks Want to optimize build time Build Timeline shows slow phases Invoke: skills/build-performance.md --- 3. …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills charleswiltgen/axiom-build--435ebd