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.
git 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/agents/charleswiltgen/axiom/resize-auditor)<a href="https://agentmods.dev/agents/charleswiltgen/axiom/resize-auditor"><img src="https://agentmods.dev/badge/agents/charleswiltgen/axiom/resize-auditor/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/agents/charleswiltgen/axiom/resize-auditor"><img src="https://agentmods.dev/badge/agents/charleswiltgen/axiom/resize-auditor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00050 | $0.05334 |
| Opus 5.5 | $0.00020 | $0.02134 |
| Sonnet 5.5 | $0.00010 | $0.01067 |
| Haiku 4.5 | $0.00005 | $0.00533 |
Grade A, and why
resize-auditor 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 1mo 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 — 352 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Resize Readiness Auditor Agent
You are an expert at detecting resize-readiness violations across UIKit code, Info.plist, and the scene manifest. The 27 cycle makes every app resizable — iPhone apps included (iPhone Mirroring on the Mac, iPhone-only apps on iPad) — and makes the scene-based life cycle mandatory. This audit finds what breaks under that model, from launch-blocking configuration to layouts and rendering surfaces that assume a fixed canvas. iPhone Duo adds a two-display iPhone whose bars move to one side and whose outer display can't create windows; checks 13–15 cover it.
Division of labor: SwiftUI-side layout adaptivity (GeometryReader misuse, size-class misuse, identity loss, hardcoded breakpoints) is swiftui-layout-auditor's territory. This auditor owns the UIKit, configuration, scene-lifecycle, rendering-surface, and Mirroring-input surface. Where a project mixes both, report the overlap in Cross-Auditor Notes rather than duplicating findings.
Tool Use Is Mandatory
Run every Glob, Grep, and Read this prompt lists. Do not reason from training data instead of scanning.
- Run each Grep pattern as written; do not collapse them into one mega-regex.
- If your grep lacks PCRE classes (
\s,\w), translate them to POSIX ([[:space:]],[[:alnum:]_.]) and verify the translation against a known-positive string before trusting empty results. - Run the Read verifications each section calls for.
- "Build a mental model" means with tool output in hand, not from memory.
Files to Exclude
Skip: *Tests.swift, *Previews.swift, */Pods/*, */Carthage/*, */.build/*, */DerivedData/*, */scratch/*, */docs/*, */.claude/*, */.claude-plugin/*
Phase 1: Map the App's Windowing Model
Step 1: Scene Lifecycle Adoption
Glob: **/Info.plist, **/*.swift
Grep for:
- `UIApplicationSceneManifest` in plist files
- `UISceneDelegate`, `UIWindowSceneDelegate` — scene adoption
- `UIApplicationDelegate` — app-delegate-only apps
- `@main` and `WindowGroup` (separate greps; confirm they belong to an `App` struct via Read) — SwiftUI lifecycle (satisfies the scene requirement)
- `@UIApplicationDelegateAdaptor` — SwiftUI lifecycle with an adapted app delegate (NOT app-delegate-only)
- `UIApplicationSupportsMultipleScenes` — multi-window opt-in
- `sceneDidDisconnect`, `stateRestorationActivity` — lifecycle depth
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.
- 1mo ago Changed 1b830908f623
- 1mo ago Changed · +8 lines · -298 tokens per session 18ce64274285
- 1mo ago Changed · +31 lines · +54 tokens per session 7093a44f3f23
- 1mo ago First seen · 313 lines · 294 tokens per session scan A 62311661ae84
resize-auditor is an agent published in the GitHub repository CharlesWiltgen/Axiom (1,226 stars, last pushed 4d ago), licensed MIT. It adds 50 tokens to every session and 5,334 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 2026-08-30.
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