cryptokit

cryptokit is a skill for Claude Code from thiennc-tesoglobal/ios-skills. It costs 96 tokens per session (1,490 once invoked), scanned A, original, no licence file.

A guide for using Apple's CryptoKit, a Swift library for cryptography, the techniques used to protect and verify data. It covers hashing, message authentication, encryption, digital signatures, key exchange, and secure hardware keys.

In plain words
What is it for?
Use it when building Swift features for hashing, HMACs, AES-GCM or ChaChaPoly encryption, signatures, key exchange, Secure Enclave keys, or related CryptoKit migrations.
Why use it?
It helps developers choose and apply the cryptographic operations supported by CryptoKit instead of implementing those operations themselves.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the ios-engineering-skills plugin — 19 skills shipped together , and of apple-kit-skills, all-ios-skills

Good fit Use it when building Swift features for hashing, HMACs, AES-GCM or ChaChaPoly encryption, signatures, key exchange, Secure Enclave keys, or related CryptoKit migrations.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/thiennc-tesoglobal/ios-skills/cryptokit
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 thiennc-tesoglobal/ios-skills --skill cryptokit
Clone the repo
git clone --depth 1 https://github.com/thiennc-tesoglobal/ios-skills

Made for: Claude Code.

Or install ios-engineering-skills, the plugin that ships this one along with the rest of its 19 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.

agentmods badge for cryptokit

README.md
[![agentmods](https://agentmods.dev/badge/skills/thiennc-tesoglobal/ios-skills/cryptokit/github.svg)](https://agentmods.dev/skills/thiennc-tesoglobal/ios-skills/cryptokit)
Your own site
<a href="https://agentmods.dev/skills/thiennc-tesoglobal/ios-skills/cryptokit"><img src="https://agentmods.dev/badge/skills/thiennc-tesoglobal/ios-skills/cryptokit/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.

agentmods 80×15 button for cryptokit

Your own site · 80×15
<a href="https://agentmods.dev/skills/thiennc-tesoglobal/ios-skills/cryptokit"><img src="https://agentmods.dev/badge/skills/thiennc-tesoglobal/ios-skills/cryptokit.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 96 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,490 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 unknown 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 5.1 $0.00096 $0.01490
Opus 5 $0.00048 $0.00745
Sonnet 5 $0.00019 $0.00298
Haiku 4.5 $0.00010 $0.00149

Measured 3d ago against content hash bf7b9ed427cc, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

cryptokit 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 3d 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.

skills/cryptokit/SKILL.md · 146 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Files

What ships with it

3 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.

  1. 3d ago Changed · +9 lines bf7b9ed427cc
  2. 10d ago First seen · 137 lines · 96 tokens per session scan A 20320009d715

Subscribe to this mod's changes

cryptokit is a skill published in the GitHub repository thiennc-tesoglobal/ios-skills (2 stars, last pushed 4d ago), with no licence file. It adds 96 tokens to every session and 1,490 once invoked, about $0.0005 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 2026-08-31.

Related

Other skills, from other repositories

swift-expert

Expert-level Swift development for iOS, macOS with SwiftUI, Combine, and modern Swift 5.9+. Use when the user mentions iOS, macOS, SwiftUI, Combine, async await, or Apple platforms, or when the task involves Modern Swift Features, Basics and Optionals, Functions and Closures, or Structs and Classes.

personamanagmentlayer/pcl · 76 tokens

ios-expert

Expert in iOS development with SwiftUI, UIKit, Combine, and Apple ecosystem integration. Use when the user mentions mobile, Swift, SwiftUI, UIKit, Apple platforms, or Xcode, or when the task involves iOS App Architecture, SwiftUI Fundamentals, UIKit Essentials, or Combine Framework.

personamanagmentlayer/pcl · 64 tokens

swift-architecture-skill

Swift iOS architecture guidance and playbooks for MVVM, MVI, TCA, Clean Architecture, VIPER, MVP, Coordinator, and Reactive patterns. Use when designing, implementing, refactoring, or reviewing the architecture of a SwiftUI or UIKit feature, module, or codebase.

efremidze/swift-architecture-skill · 65 tokens

antigravity-root

Enterprise-grade iOS development workflow for TTBaseUIKit-powered apps. Cross-functional product analysis | MVVM-C Architecture | UIKit + SwiftUI | TTViewCodable | TTBaseSUI | xcodebuild CLI Verification | Zero Regression | iOS 14+.

tqtuan1201/TTBaseUIKit · 57 tokens

swiftui-whats-new-27

New SwiftUI APIs, behaviors, and deprecations introduced in the 2027 OS releases (iOS 27, macOS 27, watchOS 27, tvOS 27, visionOS 27). Use when a SwiftUI view using @State fails to compile with "used before being initialized", "invalid redeclaration of synthesized property", or "extraneous argument label" errors after…

superagents-lab/xcode27-skills · 566 tokens

test-modernizer

Modernize test suites to use modern Swift Testing features or migrate from XCTest.

superagents-lab/xcode27-skills · 19 tokens