What is capacitor-ios-resizability?

A guide for making a Capacitor app, which is a web app packaged as a native mobile app, adapt when its iPad or iPhone window changes size.

It is for auditing viewport settings, full-height layouts, device checks, screen-size logic, orientation handling, and cached safe-area values in a Capacitor iOS project.

It helps prevent layouts that break in Split View, Slide Over, Stage Manager, or other resizable windows by checking both the web code and native iOS code.

capacitor-ios-resizability — Skill for Claude Code by Cap-go

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.

Any agent

npx skills add Cap-go/capgo-skills --skill capacitor-ios-resizability

Clone the repo

git clone --depth 1 https://github.com/Cap-go/capgo-skills

Made for: Claude Code.

Or install capacitor-ui, the plugin that ships this one along with the rest of its 5 skills.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/cap-go/capgo-skills/capacitor-ios-resizability/github.svg)](https://agentmods.dev/skills/cap-go/capgo-skills/capacitor-ios-resizability)

Your own site

<a href="https://agentmods.dev/skills/cap-go/capgo-skills/capacitor-ios-resizability"><img src="https://agentmods.dev/badge/skills/cap-go/capgo-skills/capacitor-ios-resizability/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/cap-go/capgo-skills/capacitor-ios-resizability"><img src="https://agentmods.dev/badge/skills/cap-go/capgo-skills/capacitor-ios-resizability.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 235 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,417 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00235	$0.02417
Opus 5.5	$0.00094	$0.00967
Sonnet 5.5	$0.00047	$0.00483
Haiku 4.5	$0.00023	$0.00242

Measured 14d ago against content hash ab18996d0cde, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

capacitor-ios-resizability 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 14d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/scan-legacy-apis.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

plugins/capacitor-ui/skills/capacitor-ios-resizability/SKILL.md · 127 lines

How it starts

The opening of the file, as written. The whole thing — 127 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Resizable Windows for Capacitor iOS Apps

A Capacitor app is a full-window WKWebView in CAPBridgeViewController. The web view follows its window. The work is to make the web layout respond to width changes, and to remove native code (app, custom code, plugins) that assumes one full-screen window.

When to Use

TRIGGER when:

Preparing an app for iPad multitasking, Stage Manager, windowed iPad apps, the foldable iPhone, or external displays
The layout breaks or does not update when the window is resized
A native overlay from a plugin (scanner, camera preview, custom sheet) is the wrong size or position in split view
Xcode or App Store Connect warns about UIRequiresFullScreen, missing iPad orientations, or launch screen requirements
The user asks to remove UIScreen.main, userInterfaceIdiom, interfaceOrientation or AppDelegate lifecycle use

Do not use:

CSS env(safe-area-inset-*) setup and notch padding only: safe-area-handling
Moving AppDelegate to SceneDelegate: capacitor-uiscene-migration (prerequisite for Xcode 27)
Keyboard overlap: capacitor-keyboard
Tailwind breakpoints only: tailwind-capacitor

Facts that drive the plan

iOS 27 ignores UIRequiresFullScreen and resizes the scene anyway (TN3192). Never delete the key silently: deleting it makes the app resizable at once on current iOS. Never add UIRequiresFullScreenIgnoredStartingWithVersion on your own: its value decides which releases keep the old behavior. Both are the user's call, after testing.
The iOS 27 SDK requires a launch screen declaration. Without one the upload is rejected with ITMS-90870. Capacitor templates set UILaunchStoryboardName; keep it.
Xcode 27 requires the scene lifecycle. Capacitor 8.5 templates ship SceneDelegate.swift. Without it, AppDelegate lifecycle methods are the only signal, which is wrong in multi-window. Run capacitor-uiscene-migration first if UIApplicationSceneManifest is missing.
Keep UIApplicationSupportsMultipleScenes = false. Each scene would create its own CAPBridgeViewController, with a second WebView and plugin set. Capacitor added scene-scoped notifications in 8.5 so plugins can prepare, but multi-window is not supported in the templates. Resizing works with a single scene.
CAPBridgeViewController builds supportedInterfaceOrientations from the iPhone key UISupportedInterfaceOrientations only, not from UISupportedInterfaceOrientations~ipad (Capacitor 8.5 source). An iPad that declares all four orientations can still be locked by the bridge mask. Report it; override supportedInterfaceOrientations in a bridge subclass only if the user wants different iPad behavior.
The web layer gets resize events for free. WKWebView resizes with the window and fires resize. Breakage comes from layout code that reads the device instead of the viewport.
Plugins are third-party code. Edits to node_modules are lost on install. Report plugin findings, upgrade the plugin, open an issue upstream, or use patch-package only as a stopgap, with user approval.

Read the full file on GitHub · 127 lines

Files

What ships with it

7 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.

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.

14d ago First seen · 127 lines · 235 tokens per session scan A ab18996d0cde

Subscribe to this mod's changes

capacitor-ios-resizability is a skill published in the GitHub repository Cap-go/capgo-skills (73 stars, last pushed 7d ago), licensed MIT. It adds 235 tokens to every session and 2,417 once invoked, about $0.0009 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 2026-10-11.

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