qa-ios-layout

Audit SwiftUI layout patterns for known dangerous patterns that cause visual bugs.

Command for Claude Code

Install

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.

agentmods
npx agentmods add commands/dmoskov/shadowsky/qa-ios-layout
Clone the repo
git clone --depth 1 https://github.com/dmoskov/shadowsky

Made for: Claude Code.

Per session 13 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 702 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00013 $0.00702
Opus 5 $0.00006 $0.00351
Sonnet 5 $0.00003 $0.00140
Haiku 4.5 $0.00001 $0.00070

Measured today against content hash 3e2affb86703, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

qa-ios-layout 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 today.

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.

.claude/commands/qa-ios-layout.md · 65 lines

How it starts

The opening of the file, as written. The whole thing — 65 lines — stays where its author put it; the contents beside it link to each section on GitHub.

SwiftUI Layout Pattern Audit

Scan all native iOS Swift files for layout patterns known to cause visual bugs. Report findings with file:line references and suggested fixes.

Patterns to Check

1. CRITICAL: .fixedSize inside scrollable containers

.fixedSize(horizontal: false, vertical: true) in a ScrollView/LazyVStack tells SwiftUI to use the view's "ideal" (unwrapped) width, which can exceed screen width and cause content clipping.

Search: Grep for fixedSize in all Swift files under mobile/modules/.

Safe uses: .fixedSize is safe on views with bounded intrinsic size (e.g., Image, short Text). It's dangerous on UIViewRepresentable views or multi-line Text views inside scrollable containers.

Fix: Replace with .frame(maxWidth: .infinity, alignment: .leading).

2. CRITICAL: UIScreen.main.bounds for layout width

Hardcoding width from UIScreen.main.bounds ignores parent padding and safe areas, causing overflow.

Search: Grep for UIScreen.main.bounds in all Swift files under mobile/modules/.

Fix: Use GeometryReader to get the actual available width from the parent container.

3. HIGH: UIViewRepresentable missing compression resistance

UITextView and other UIKit views wrapped in UIViewRepresentable can report unbounded intrinsic content width. Without setting compression resistance priority, the parent SwiftUI layout will expand to accommodate it.

Search: Find all UIViewRepresentable conformances, then check if makeUIView sets setContentCompressionResistancePriority(.defaultLow, for: .horizontal).

Fix: Add textView.setContentCompressionResistancePriority(.defaultLow, for: .horizontal) in makeUIView.

4. MEDIUM: Missing public access on shared types

Expo native module types that are referenced across module boundaries need public access modifiers on structs, properties, and initializers. Missing public causes silent compilation issues or runtime crashes.

Search: Check structs in ExpoSwiftUIFeed module — ImageEmbedData, VideoEmbedData, ExternalLinkEmbedData, QuoteEmbedData, PostEmbedData, EmbedType — for public access.

Read the full file on GitHub · 65 lines

Changes

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.

  1. today First seen · 65 lines · 13 tokens per session scan A 3e2affb86703

Subscribe to this mod's changes

qa-ios-layout is a command published in the GitHub repository dmoskov/shadowsky (17 stars, last pushed yesterday), licensed MIT. It adds 13 tokens to every session and 702 once invoked, about $0.0001 per session on Opus 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 2026-09-01.