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 eric861129/SKILLS_All-in-one --skill swift-expertgit clone --depth 1 https://github.com/eric861129/SKILLS_All-in-oneWrote 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/eric861129/skills_all-in-one/swift-expert)<a href="https://agentmods.dev/skills/eric861129/skills_all-in-one/swift-expert"><img src="https://agentmods.dev/badge/skills/eric861129/skills_all-in-one/swift-expert/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/eric861129/skills_all-in-one/swift-expert"><img src="https://agentmods.dev/badge/skills/eric861129/skills_all-in-one/swift-expert.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 | $0.00098 | $0.01301 |
| Opus 5 | $0.00049 | $0.00651 |
| Sonnet 5 | $0.00020 | $0.00260 |
| Haiku 4.5 | $0.00010 | $0.00130 |
Grade A, and why
swift-expert scanned grade A with 1 finding 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 7d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
func fetch(id: Entity.ID) async throws -> Entity How it starts
The opening of the file, as written. The whole thing — 164 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Swift Expert
Core Workflow
- Architecture Analysis - Identify platform targets, dependencies, design patterns
- Design Protocols - Create protocol-first APIs with associated types
- Implement - Write type-safe code with async/await and value semantics
- Optimize - Profile with Instruments, ensure thread safety
- Test - Write comprehensive tests with XCTest and async patterns
Validation checkpoints: After step 3, run
swift buildto verify compilation. After step 4, runswift build -warnings-as-errorsto surface actor isolation and Sendable warnings. After step 5, runswift testand confirm all async tests pass.
Reference Guide
Load detailed guidance based on context:
| Topic | Reference | Load When |
|---|---|---|
| SwiftUI | references/swiftui-patterns.md |
Building views, state management, modifiers |
| Concurrency | references/async-concurrency.md |
async/await, actors, structured concurrency |
| Protocols | references/protocol-oriented.md |
Protocol design, generics, type erasure |
| Memory | references/memory-performance.md |
ARC, weak/unowned, performance optimization |
| Testing | references/testing-patterns.md |
XCTest, async tests, mocking strategies |
Code Patterns
async/await — Correct vs. Incorrect
// ✅ DO: async/await with structured error handling
func fetchUser(id: String) async throws -> User {
let url = URL(string: "https://api.example.com/users/\(id)")!
let (data, _) = try await URLSession.shared.data(from: url)
return try JSONDecoder().decode(User.self, from: data)
}
// ❌ DON'T: mixing completion handlers with async context
func fetchUser(id: String) async throws -> User {
return try await withCheckedThrowingContinuation { continuation in
// Avoid wrapping existing async APIs this way when a native async version exists
legacyFetch(id: id) { result in
continuation.resume(with: result)
}
}
}
What ships with it
5 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.
- 7d ago First seen · 164 lines · 98 tokens per session scan A d3c27b68cb68
swift-expert is a skill published in the GitHub repository eric861129/SKILLS_All-in-one (52 stars, last pushed 4mo ago), licensed MIT. It adds 98 tokens to every session and 1,301 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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