Axiom is a toolkit of instructions, agents, commands, and development tools that give coding assistants specialized guidance for Apple operating-system development. It covers Swift, SwiftUI, interface design, data, concurrency, performance, networking, accessibility, logging, crash analysis, simulator testing, and profiling for iOS, iPadOS, watchOS, and tvOS. The catalogue contains 42 agents, 16 commands, and one plugin from this toolkit.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add CharlesWiltgen/Axiom --skill axiom-toolsgit clone --depth 1 https://github.com/CharlesWiltgen/AxiomWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/charleswiltgen/axiom/axiom-tools)<a href="https://agentmods.dev/skills/charleswiltgen/axiom/axiom-tools"><img src="https://agentmods.dev/badge/skills/charleswiltgen/axiom/axiom-tools/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/charleswiltgen/axiom/axiom-tools"><img src="https://agentmods.dev/badge/skills/charleswiltgen/axiom/axiom-tools.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00054 | $0.02496 |
| Opus 5.5 | $0.00022 | $0.00998 |
| Sonnet 5.5 | $0.00011 | $0.00499 |
| Haiku 4.5 | $0.00005 | $0.00250 |
Grade A, and why
axiom-tools scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 149 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Axiom Tools & Onboarding
This suite covers Axiom itself — how to use it, what's available, and the tools that ship with it.
Bundled tools on Claude Code: if command -v <tool> finds nothing (hooks off or --bare), use <plugin-root>/tools/<tool> in place of the bare name; <plugin-root> is two levels above this skill's Base directory for this skill: path.
Can't launch Axiom agents? Where this router sends you to an agent, follow its procedure inline. Over MCP,
axiom_get_agentreturns it; elsewhere, read its file below, which needs only file search and read.Homed in another suite:
axiom-accessibility/skills/accessibility-auditor.md,axiom-concurrency/skills/concurrency-auditor.md,axiom-performance/skills/energy-auditor.md,axiom-performance/skills/memory-auditor.md,axiom-testing/skills/test-failure-analyzer.md.For any other agent, over MCP
axiom_get_agentreturns it too; run its xclog, xcsym and xcprof steps with theaxiom_xclog_*,axiom_xcsym_*andaxiom_xcprof_*tools. Elsewhere, search Axiom's skills forskills/<agent>.md; if there is none, do that work yourself with this suite's skills, using any Axiom tool on yourPATH.
Build and Test Capture
For axbuild installation, report handling and saved-log fallback, read axiom-build before a build or test.
Routing
| Question | Read |
|---|---|
| "How do I use Axiom?" / "What skills are available?" | skills/getting-started.md |
| "How do I capture console output?" / "What is xclog?" | skills/xclog-ref.md |
| "How do I symbolicate a crash?" / "What is xcsym?" / "Why is my crash unsymbolicated?" | skills/xcsym-ref.md |
| "How do I drive/validate the sim UI?" / "What is xcui?" / "How do I script accessibility checks?" | skills/xcui-ref.md |
| "How do I analyze a trace / CPU or network profile?" / "What is xcprof?" / "Why does the profiler report no findings?" | skills/xcprof-ref.md |
| "How do I control a simulator/device without Xcode running?" / "What is Device Hub?" / "devicectl vs simctl?" | skills/device-control-ref.md |
| "How do I capture a screenshot or record video of a sim or device from the CLI?" | skills/device-control-ref.md (Screen capture) |
| "How do I clean up the status bar for App Store screenshots?" / "How do I set the time to 9:41 and full bars?" | skills/device-control-ref.md (Status bar for screenshots) |
| "Can I automate resize testing?" / "Does my layout hold across breakpoints?" | skills/xcui-ref.md (Resize sweeps) — xcui resize sweep |
"How do I drive appResize by hand?" |
skills/device-control-ref.md (Resizable app sessions) |
| "How do I inspect an Xcode project's targets or build settings?" / "What is xcproject?" | axiom-build (skills/build-performance.md) (Project selection and effective settings) |
What ships with it
6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago Changed · +1 lines 0507f70d0116
- 10d ago Changed · +2 lines 268bd0050781
- 15d ago Changed · +4 lines e1021686148f
- 19d ago Changed · +4 lines · -10 tokens per session 4cc677dba749
- 1mo ago First seen · 138 lines · 64 tokens per session scan A 8278b9669762
axiom-tools is a skill published in the GitHub repository CharlesWiltgen/Axiom (1,226 stars, last pushed 4d ago), licensed MIT. It adds 54 tokens to every session and 2,496 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-06.
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