Axiom

Axiom

Battle-tested skills, agents, and tools for modern Apple OS development — Swift 6, SwiftUI, Liquid Glass, Apple Intelligence, and more. Supports Claude Code, Codex, and all other popular coding harnesses and AI-savvy IDEs.

What is Axiom?

Axiom gives AI coding assistants deep Apple OS development expertise — the kind that prevents data loss from bad migrations, catches memory leaks before users complain, and stops you from spending 30 minutes debugging a zombie xcodebuild process.

• 289 skills covering UI, data, concurrency, performance, networking, accessibility, and more
• 44 agents that autonomously scan for issues (memory leaks, concurrency violations, build problems)
• 18 commands for quick audits and diagnostics

• axbuild — a built-in build and test runner that saves the full log and gives AI assistants a short summary of errors and failed tests, so nothing is lost to truncated output
• xclog — a built-in console capture tool that gives AI assistants access to simulator and device logs
• xcsym — a built-in crash symbolication tool for .ips, MetricKit, and Apple's legacy .crash text crashes, with automatic dSYM discovery and pattern categorization
• xcui — a built-in tool to drive and validate the simulator UI and accessibility (tap by accessibility ID, wait for and assert on elements, check VoiceOver and Dynamic Type)
• xcprof — a built-in tool to record and analyze CPU/performance traces (xctrace) without opening Instruments
• xcproject — a built-in tool that reads Xcode project structure and build settings, in either project format, without modifying the project

Every discipline skill is TDD-tested against real developer pressure scenarios. Learn more about quality.

OS 27 in progress. Axiom is on a 27.x beta that tracks Apple's OS 27 developer betas — OS-27 coverage lands continuously through the beta season. Guidance for OS 26 and earlier stays stable.

Installation

Claude Code (native plugin)

/plugin marketplace add CharlesWiltgen/Axiom

Then search for "axiom" in the /plugin menu and install.

Codex

npx skills add CharlesWiltgen/Axiom -a codex -g

That installs the skills. For the full Codex plugin, which adds bundled helpers, an installation check, and Axiom's lifecycle hooks, add Axiom as a native plugin instead:

codex plugin marketplace add CharlesWiltgen/Axiom
codex plugin add axiom@axiom-marketplace

The hooks stay off until you set features.hooks = true in ~/.codex/config.toml and approve Codex's trust prompt. See the Codex install guide.

Claude app (browser and desktop)

In your browser at claude.ai or in Claude Desktop, open Customize > Plugins, select Add > Add marketplace and enter CharlesWiltgen/Axiom, then add the axiom plugin. Chat loads the skills, Cowork adds the agents and hooks, and Claude Code picks the plugin up from your account. See the Claude app guide.

Cursor (native plugin)

Axiom's generated Cursor plugin includes 27 skill routers, 44 agents, 18 /axiom-* commands, advisory hooks, and automatic discovery of its MCP server configuration. See the Cursor install and support guide for the macOS support boundary and local installation steps.

MCP (VS Code, Cursor MCP-only, Gemini CLI, and more)

See the MCP setup guide.

Pi (terminal coding agent)

pi install git:github.com/CharlesWiltgen/Axiom

One command installs the skills plus the /axiom-* commands and hooks. See the Pi setup guide.

Xcode (Claude Agent / Codex)

See the Xcode integration guide.

Getting Started

Skills activate automatically based on your questions. Just ask:

"I'm getting BUILD FAILED in Xcode"
"How do I fix Swift 6 concurrency errors?"
"My app has memory leaks"
"I need to add a database column safely"
"Show me what my app is logging"
"Symbolicate this crash file"

You can also use commands directly:

/axiom:console          # Capture simulator console output
/axiom:analyze-crash    # Parse and triage .ips, MetricKit, or .crash reports
/axiom:fix-build        # Diagnose build failures
/axiom:audit memory     # Scan for memory leaks
/axiom:audit concurrency # Check for data races
/axiom:health-check     # Run all relevant auditors

Documentation

Full documentation, skill catalog, and guides at charleswiltgen.github.io/Axiom.

Community

• r/axiomdev — Version announcements with changelogs
• Report issues or request features
• Share usage patterns and questions