Build Swift Apps Router Agent Skill

Route broad or ambiguous Swift and Apple-platform work to a focused skill; this router does not implement domain work.

Context cost
1.6k tokensestimated from the bundle, loaded when it triggers
Bundle
2 files · 6.3 kBtext throughout, nothing executable
Licence
MITthe author’s own terms
Last change
—no release on file
Servers it uses
Noneruns standalone

What it does

Route broad or ambiguous Swift and Apple-platform work to a focused skill; this router does not implement domain work. Covers iOS, macOS, SwiftUI, Xcode, Simulator, App Store Connect, Tuist, SwiftPM, signing, profiling, and Apple research.

What this skill changes about the agent has not been set out here as a list. Its SKILL.md, shown below, says it in the author’s own words.

mobileswift

The skill itself

A skill is instructions the model reads, so you can see what you are getting: below is the start of its SKILL.md. The front matter loads with every session, the body loads when the skill triggers, and the whole file comes with the install.

SKILL.md6.0 kB · preview
--- name: build-swift-apps ---
6# Build Swift Apps Router
7
8Use this as the first hop when a request could match more than one Build Swift Apps skill. Do not complete domain work from this router alone; choose the narrow skill, read it, then act.
9
10## Execution Locus
11
12- Determine the execution host and project location before invoking tools. Run Xcode, Apple Simulator, Apple-target SwiftPM builds, Tuist, signing, notarization, and other Apple-toolchain commands on the macOS host that owns the project and toolchain.
13- When the task UI is on Windows or Linux but a Mac SSH project or remote XcodeBuildMCP transport is configured, keep the local host as the control plane and execute Apple work in that remote Mac context. Do not retry missing Apple binaries locally.
14- Do not impose a blanket macOS requirement on source-only review, deterministic offline helpers, or network/API workflows that explicitly support the current host; preflight their actual dependencies instead.
15
16## Routing Rules
17
18- If the user should see, inspect, or interact with a running iOS app, prefer ios-simulator-browser; use ios-simulator-debugger first only to build/run, pick a Simulator UDID, inspect UI trees, logs, bundle IDs, or handle headless automation.
19- Use ios-rocketsim-operator only when RocketSim-specific UI automation, visible accessibility state, or its bundled CLI is required.
20- Use ios-ettrace-profiler for CPU/startup/scrolling/runtime performance traces; use ios-memgraph-inspector for leaks, retain cycles, and before/after memory proof.
21- For iOS SwiftUI implementation, use ios-swiftui-architect; for macOS SwiftUI scenes/windows/menus/settings, use macos-swiftui-architect; for platform-neutral SwiftUI refactors, use swiftui-view-architect; for runtime performance review, use swiftui-performance-inspector.
22- For Xcode build speed, start with xcode-build-strategist unless the user explicitly asks only for a baseline, compile hotspot analysis, project settings audit, or approved tuning. Then route to xcode-build-baseline, xcode-compile-profiler, xcode-project-auditor, or xcode-build-tuner.
23- For App Store release work, use appstore-release-director for end-to-end publishing, appstore-release-planner for go/no-go readiness planning, and appstore-review-readiness for concrete validate/stage/submit/monitor/cancel/repair commands. Use appstore-connect-cli for generic ASC command discovery, auth, schemas, pagination, output, and App Store Connect record/API work; use appstore-ads-operator for Apple Ads auth, orgs, campaigns, ad groups, creatives, keywords, reports, or Ads API calls. Use other focused appstore-* skills for ID resolution, archive/upload, build monitoring, TestFlight, metadata, screenshots, signing, pricing, subscriptions, crash feedback, or workflow automation.
24- For App Store text and localization, use appstore-metadata-sync for canonical ./metadata JSON field operations, appstore-metadata-localizer for translation/adaptation across listing locales, appstore-release-notes-writer for What's New or promotional text, and appstore-subscription-localizer for subscription/group/IAP display names.
This is a preview of SKILL.md. Download or install the skill to get the whole thing.
In the file
SKILL.md702 words
Files2
LicenceMIT
Why you can read it

Nothing in a skill executes. The client loads the text and the model follows it, so a skill can be audited the way a runbook is — by reading it.

What it costs in context

Skills are not billed by the call. They are paid for in context: every token the instructions occupy is a token your code, your diff and your conversation cannot use. Here is what this one takes and when it takes it.

≈70
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
1,505
on trigger
The instruction body and 1 supporting file, read only when the skill fires.
0.79%
of a 200k window
Ten skills this size would take about 8% of the window before you open a file.
050k100k150k200k context window

1.6k tokens, estimated from the bundle at four bytes to the token, held for the rest of the session once it triggers. Middling. Fine to keep on in a project where you use it weekly, worth unloading in one where you never do.

Servers bill, skills cost

A server charges by the month. A skill charges once per session, in context, and then keeps charging it for as long as the session lives.

Before and after

The same question, put to the same model twice: once as it comes, and once with these instructions loaded.

No worked example has been published for this skill yet.

The procedure it runs

The procedure has not been set out here step by step. It is in the body of its SKILL.md: the start of it is shown above, and the whole file comes with the install.

Prose, not code

These steps are written for a model to follow, not executed by a runtime. It can still be told to skip one, and it will say so when it does.

Servers it uses

None. This skill calls no MCP servers at all.

Everything it needs is in the instructions, so it works in a project with nothing connected — the model reads the file and changes how it works with what it can already reach.

Its SKILL.md does not declare which tools it asks the agent for, so what it touches is whatever the instructions themselves ask for — read them before you install it.

What it asks for
Writes filesnot declared
Network accessnot declared

This SKILL.md carries no allowed-tools line, so neither is declared. A skill grants no permissions of its own — it can only ask for tools your client already has.

What it will not do

Every skill is narrow, and the useful ones say where they stop. These are the jobs this one is the wrong tool for.

What this skill is not for has not been published here. Nothing is implied by that: it is a section the author has not filled in.

What is in the bundle

2 files, 6.3 kB on disk. A bundle is text throughout: the instructions the model reads, plus the templates it fills in.

  • SKILL.md6.0 kB
  • agents/openai.yaml0.3 kB
What is not in it

No dependencies and nothing executable: a skill is text the agent reads, so the bundle is 2 files you can review in full before installing. The MIT licence covers the templates and examples as well as the instructions.

Install

Installing copies the bundle into your project. Nothing runs at install time — the files sit on disk until the model reads them.

# Build Swift Apps Router · 1.6k tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/build-swift-apps-router/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/build-swift-apps-router" ] && { [ ! -e .claude/skills/build-swift-apps-router ] || { mv .claude/skills/build-swift-apps-router "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/build-swift-apps-router" .claude/skills/ && echo "Installed .claude/skills/build-swift-apps-router"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add xopoko/build-swift-apps-router

Windows PowerShell says 'running scripts is disabled on this system'? Run Set-ExecutionPolicy -Scope CurrentUser RemoteSigned once, or type npx.cmd instead of npx (codex.cmd, gemini.cmd, grok.cmd likewise). PowerShell 7 needs neither. Writes to .claude/skills/build-swift-apps-router/ in the current project. For every project instead, run mkdir -p ~/.claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/build-swift-apps-router/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/build-swift-apps-router" ] && { [ ! -e ~/.claude/skills/build-swift-apps-router ] || { mv ~/.claude/skills/build-swift-apps-router "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/build-swift-apps-router" ~/.claude/skills/ && echo "Installed ~/.claude/skills/build-swift-apps-router" (macOS, Linux) — or add --global to the npx line. The curl line replaces .claude/skills/build-swift-apps-router/ only after the download succeeds, so files left there by another skill of the same name, or by an older release, do not mix in. A copy already there is moved aside, not deleted, and the line prints where. It appears as build-swift-apps in Gemini CLI, Codex, Copilot and Grok (its own name); Claude Code lists it by the folder name, build-swift-apps-router.

Which clients pick it up on their own

A skill is a folder of text. Most of these read a skills folder and pick it up without being told; the rest take the same folder another way — an upload in the app, a parameter on an API call — and then choose it by its description just the same.

Claude Code.claude/skills/
Claude DesktopCustomize › Skills
ChatGPTSkills › Create › Upload
Cursor.cursor/skills/
VS Code.github/skills/
Codex CLI.agents/skills/
Gemini CLI.gemini/skills/
Grok Build.grok/skills/
Microsoft CopilotSkills › Upload a skill
PerplexityComputer › Skills › Upload a skill
DeepSeek Harness.dsh/skills/
Zed.agents/skills/
Devin Desktop.devin/skills/
Windsurf (legacy).windsurf/skills/
OpenAI Agents SDKInstructions or sandbox Skills
HTTP / APIa request parameter
This release
Versionnot versioned
Publishedno release date on file
PriceFree
Referencexopoko/build-swift-apps-router

Versions

Its author publishes no version number, so there is nothing here to pin to: what you install is the folder as it stands today. Instructions change more often than APIs do — a skill can be rewritten entirely without anything it depends on moving.

Pinning

Nothing to pin to: this skill carries no version number of its own. What you install is what the folder holds on the day you install it.

Reviews

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