A curated reference of high-quality agent skills for Claude Code, organized by domain. All skills follow the Agent Skills open format and work across Claude Code, Codex, Gemini CLI, Cursor, and Copilot.

Last updated: March 7, 2026

How to Install Skills

Three primary methods. The npx skills CLI (by Vercel) is the most universal.

# Method 1: Vercel skills CLI (works for any agent)
npx skills add <owner>/<repo> --skill <skill-name>
npx skills add <owner>/<repo> --list # see all skills in a repo
npx skills add <owner>/<repo> --all # install everything
npx skills add -g <owner>/<repo> # install globally

# Method 2: Claude Code native plugin system
/plugin marketplace add <owner>/<repo>
/plugin install <skill-name>@<marketplace-name>

# Method 3: Manual (any agent)
git clone <repo-url>
cp -r <skill-folder> ~/.claude/skills/ # global
cp -r <skill-folder> .claude/skills/ # project-scoped

Skills activate automatically when Claude matches a request to a skill’s description field, or manually via /skill-name. The SKILL.md format spec lives at agentskills.io/specification.

SwiftUI, iOS & Apple Platforms

AvdLee/SwiftUI-Agent-Skill — SwiftUI Expert

The gold standard for SwiftUI agent skills. ~1,700+ stars, the most popular Swift agent skill on GitHub. Covers state management (@State, @Binding, @Observable, @Bindable), view composition, performance patterns, sheets/navigation/scrolling, animation, accessibility, image optimization, layout best practices, and iOS 26+ Liquid Glass adoption with fallback patterns.

Field	Value
Repo	github.com/AvdLee/SwiftUI-Agent-Skill
Install	`npx skills add AvdLee/SwiftUI-Agent-Skill --skill swiftui-expert-skill`
References	14 files: liquid-glass, state-management, performance, accessibility, animation (basics/advanced/transitions), image-optimization, latest-apis, layout, lists, scroll, sheets, view-structure
License	MIT

AvdLee/Swift-Concurrency-Agent-Skill — Swift Concurrency Expert

Deep Swift Concurrency guidance based on AvdLee’s 70+ lesson course. Covers async/await, actors, tasks, task groups, @MainActor, Sendable, isolation domains, data race prevention, AsyncSequence/AsyncStream, Core Data + concurrency integration, performance profiling, testing, and step-by-step Swift 6 migration.

Field	Value
Repo	github.com/AvdLee/Swift-Concurrency-Agent-Skill
Install	`npx skills add AvdLee/Swift-Concurrency-Agent-Skill --skill swift-concurrency`
References	13 files: async-await, tasks, sendable, actors, async-sequences, threading, memory-management, core-data, performance, testing, migration, glossary, linting
License	MIT

AvdLee/Core-Data-Agent-Skill — Core Data Expert

Comprehensive Core Data expertise from 4+ years of production experience on Collect by WeTransfer. Covers stack setup, view context vs background context, fetch request optimization, NSFetchedResultsController, batch operations, CloudKit integration, lightweight/staged/deferred migration, persistent history tracking, and testing patterns.

Field	Value
Repo	github.com/AvdLee/Core-Data-Agent-Skill
Install	`npx skills add AvdLee/Core-Data-Agent-Skill --skill core-data-expert`
References	14 files: batch-operations, cloudkit, fetch-requests, migration, model-config, performance, persistent-history, project-audit, saving, stack-setup, testing
License	MIT

AvdLee/Swift-Testing-Agent-Skill — Swift Testing Expert

Modern Swift Testing framework guidance. Covers @Test, suites, traits, tags, display names, parameterized testing, XCTest migration, async testing with continuations, parallel execution, #expect/#require, known issues, and Xcode test navigator workflows. Actively prevents common agent mistakes like unnecessary @MainActor or .serialized.

Field	Value
Repo	github.com/AvdLee/Swift-Testing-Agent-Skill
Install	`npx skills add AvdLee/Swift-Testing-Agent-Skill --skill swift-testing-expert`
References	10 files: fundamentals, async-testing, expectations, xctest-migration, parallelization, parameterized, performance, traits-tags, xcode-workflows
License	MIT

twostraws/SwiftUI-Agent-Skill — SwiftUI Pro

From Paul Hudson (Hacking with Swift). Deliberately concise to respect token budgets. Focuses on edge cases and surprises that LLMs don’t know: deprecated API avoidance, performance (avoid work in body/initializers, @Observable optimizations), accessibility (VoiceOver labels, touch targets, Dynamic Type), Swift concurrency tips, project hygiene. Targets iOS 26+.

Field	Value
Repo	github.com/twostraws/SwiftUI-Agent-Skill
Install	`npx skills add twostraws/SwiftUI-Agent-Skill --skill swiftui-pro`
License	MIT

Other Notable iOS Skills

efremidze/swift-patterns-skill — Swift Patterns with code review methodology, NavigationStack, deep linking, concurrency. 14 reference files.
Joannis/claude-skills — Swift Server skills from a Swift Server WorkGroup member. Hummingbird, Vapor, SwiftNIO. Encodes best practices as both skills AND linter rules.
swiftwasm/skills — Official SwiftWasm project skills for Swift + WebAssembly. JavaScriptKit, bridge-js.
raintree-technology/apple-hig-skills — Apple Human Interface Guidelines encoded as 14 agent skills covering platforms, foundations, components, patterns, inputs, and technologies.
rudrankriyam/app-store-connect-cli-skills — Automate App Store deployments and management via the ASC CLI.

iOS 26, Liquid Glass & WWDC 2025

harryworld/Xcode26-Agent-Skills — Xcode 26 Comprehensive Guide

Curated notes for the Xcode 26 era. 79 stars. Validated against Apple’s hidden Xcode AI documentation, including corrections for Liquid Glass version references and Foundation Models deprecated temperature settings. Covers Liquid Glass across SwiftUI and UIKit, SwiftUI updates, AppKit, WidgetKit, and Foundation Models framework.

Field	Value
Repo	github.com/harryworld/Xcode26-Agent-Skills
Install	`git clone` + symlink `xcode-26/` to skills directory

CharlesWiltgen/Axiom — Battle-tested xOS Development Skills

Comprehensive iOS development skill pack with dedicated skills for Liquid Glass (7-section expert review checklist), SwiftUI performance (using the new SwiftUI Instrument in Instruments 26), iOS 26 SwiftUI feature reference, Xcode debugging, Swift Concurrency, memory debugging, energy profiling, database migration, Realm-to-SwiftData migration, and AVFoundation reference covering AVAudioSession, AVAudioEngine pipeline patterns, low-latency output, spatial audio (iOS 26+ ASAF/APAC), and multichannel routing.

Field	Value
Repo	github.com/CharlesWiltgen/Axiom
Install	`/plugin marketplace add CharlesWiltgen/Axiom`
Notable	Only known skill covering AVAudioEngine and AVFoundation patterns. Also covers the new SwiftUI WebView & WebPage APIs from WWDC 2025
License	MIT

dpearson2699/swift-ios-skills — 23 iOS 26+ Skills

The broadest single collection of iOS 26+ skills. 23 individual skills covering Swift 6.2, SwiftUI (patterns, animation, Liquid Glass, performance, UIKit interop), SwiftData, App Intents, StoreKit 2, WidgetKit, Live Activities, MapKit, TipKit, push notifications, networking, security, accessibility, localization, App Store review, and Apple on-device AI.

Field	Value
Repo	github.com/dpearson2699/swift-ios-skills
Install	`npx skills add dpearson2699/swift-ios-skills`
Notable	Contains SwiftData skill and Liquid Glass skill — covers the full iOS 26 stack

Other Notable iOS 26 Skills

Dimillian/Skills — From Thomas Ricouard (IceCubesApp). Dedicated Liquid Glass skill covering .glassEffect() API, GlassEffectContainer, glass button styles, morphing transitions, performance.
ameyalambat128/swiftui-skills — Extracts skills directly from Apple’s Xcode AI documentation on install (no Apple docs redistributed). SwiftData inheritance, Swift Concurrency updates, Liquid Glass design, visionOS widgets.

React, Design Systems & Web Frontend

vercel-labs/agent-skills — React Best Practices & Web Design

Vercel’s official collection. 22,100+ stars. The react-best-practices skill has 45,000+ installs with 40+ rules across 8 priority categories: eliminating waterfalls, bundle size, React Server Components, re-renders, data fetching, lint checks. The web-design-guidelines skill adds 100+ UI audit rules for accessibility, performance, layout, typography.

Field	Value
Repo	github.com/vercel-labs/agent-skills
Install	`npx skills add vercel-labs/agent-skills --list`
Skills	react-best-practices, web-design-guidelines, react-composition, react-native-best-practices, vercel-deploy, agent-browser

vercel-labs/next-skills — Next.js 16 Specific

Official Next.js skills covering RSC boundaries, async patterns, directives, cache components, and version upgrades.

Field	Value
Repo	github.com/vercel-labs/next-skills
Install	`npx skills add vercel-labs/next-skills --skill next-best-practices`
Skills	next-best-practices, next-cache-components, next-upgrade

google-labs-code/stitch-skills — shadcn/ui & React Components

From Google Labs. 2,100+ stars. Includes a dedicated shadcn/ui skill and React component composition skill. Follows the Agent Skills open standard for cross-agent compatibility.

Field	Value
Repo	github.com/google-labs-code/stitch-skills
Install	`npx skills add google-labs-code/stitch-skills --skill shadcn-ui --global`
Skills	shadcn-ui, react:components, enhance-prompt, design-md, stitch-loop, remotion
License	Apache 2.0

Other Notable Frontend Skills

markhamsquareventures/essentials — Practical shadcn/ui skill: New York style, Radix UI primitives, Tailwind CSS, CLI usage, button variants, forms.
blencorp/claude-code-kit — Tailwind CSS v4 utility-first styling patterns including CSS-first configuration, responsive design, dark mode, v4 performance notes.
secondsky/claude-skills — 176 production-tested skills including tailwind-v4-shadcn, design-review, design-system-creation, Cloudflare D1, React Native. 25 frontend skills total.
carmahhawwari/ui-design-brain — 60+ component design patterns. WCAG AA contrast, focus indicators, semantic HTML, keyboard navigation.
nextlevelbuilder/ui-ux-pro-max-skill — 50 styles, 21 palettes, 50 font pairings, 20 chart types, 9 tech stacks.
gocallum/nextjs16-agent-skills — Next.js 16, Prisma ORM 7, AI SDK v6, Auth.js v5 migration skills with shadcn/ui + MCP integration.

Database & Backend Skills

supabase/agent-skills — PostgreSQL Best Practices

Official Supabase team skill. The most authoritative Postgres agent skill covering PostgreSQL best practices for Supabase development.

Field	Value
Repo	github.com/supabase/agent-skills
Install	`npx skills add supabase/agent-skills`

Other Notable Database Skills

sanjay3290/ai-skills — Safe read-only SQL queries against PostgreSQL with multi-connection support. Also MySQL and MSSQL.
mrgoonie/claudekit-skills — Dual-database skill: MongoDB (document DB, BSON, aggregation, Atlas) AND PostgreSQL (relational, SQL, psql CLI). Schema design, query optimization, migrations, replication.
maragudk/skills — Focused SQLite guidance: SQL queries, schema analysis, migration design.
honnibal/claude-skills — From Matthew Honnibal (spaCy creator). Python-focused: source file review, type annotation tightening, pre-mortem bug analysis, package stubs. Uses .md.txt extension to prevent prompt injection in markdown rendering.

General Dev Tooling & Agentic Workflow

obra/superpowers — Agentic Software Development Methodology

The most influential workflow-oriented skills framework. 40,900+ stars. An entire software development methodology encoded as skills: brainstorming, plan writing, subagent-driven development, TDD, systematic debugging, root-cause tracing, verification-before-completion, git worktrees, remembering conversations. Version 4.1.1.

Field	Value
Repo	github.com/obra/superpowers
Install	`/plugin marketplace add obra/superpowers-marketplace` then `/plugin install superpowers@superpowers-marketplace`
Skills	brainstorming, systematic-debugging, subagent-driven-development, test-driven-development, root-cause-tracing, verification-before-completion, defense-in-depth, git-worktrees, remembering-conversations, 10+ more
License	MIT

Other Notable Tooling Skills

trailofbits/skills — Security research from Trail of Bits. Static analysis with CodeQL/Semgrep, variant analysis, code auditing, fix verification. CC-BY-SA 4.0.
hashicorp/agent-skills — Official HashiCorp skills: Terraform code/module/provider generation, style guide, Packer builders, HCP.
callstackincubator/agent-skills — From Callstack (premier React Native consultancy). Based on “The Ultimate Guide to React Native Optimization.” Best practices, upgrading, brownfield migration, GitHub workflows.
levnikolaevich/claude-code-skills — 102 production-ready skills for Agile workflow: Clean Architecture, documentation pipeline, scope decomposition, story execution, quality gates. Optional Linear integration.
alirezarezvani/claude-skills — 86 cross-domain skills. 2,300+ stars. Engineering (46 skills), product (8), marketing (7), PM (6), C-level (2), business (4), finance (1).

Anthropic Official Skills

anthropics/skills — The Official Reference

The canonical Anthropic skills repository. 69,300+ stars, 7,000+ forks. Contains the reference implementation for the Agent Skills format plus 17+ production skills.

Field	Value
Repo	github.com/anthropics/skills
Install	`/plugin marketplace add anthropics/skills` then `/plugin install document-skills@anthropic-agent-skills`

Individual skills:

Skill	Description
`frontend-design`	Production-grade frontend UI — the anti-”AI slop” kit. Color, spacing, motion, typography. 12,000+ installs
`web-artifacts-builder`	Build complex HTML artifacts using React, Tailwind CSS, and shadcn/ui
`skill-creator`	Meta-skill for creating well-structured skills. Interactive Q&A-driven workflow. 5,700+ installs
`mcp-builder`	Guide for creating MCP servers in TypeScript or Python
`webapp-testing`	Test local web apps using Playwright
`claude-api`	Loads Claude API reference for your project’s language (Python, TS, Java, Go, Ruby, C#, PHP, cURL)
`docx`	Create, edit, analyze Word documents (source-available)
`pdf`	PDF manipulation: extract text/tables, create, merge, split, OCR, forms (source-available)
`pptx`	PowerPoint presentations with layouts, templates, charts (source-available)
`xlsx`	Spreadsheet creation, editing, charting, formulas (source-available)
`algorithmic-art`	Generative art with p5.js, seeded randomness
`canvas-design`	Design visual art in PNG and PDF formats
`doc-coauthoring`	Structured 3-stage collaborative document creation
`brand-guidelines`	Apply Anthropic’s official brand colors and typography
`theme-factory`	Style artifacts with professional themes
`internal-comms`	Internal communications (status reports, newsletters, FAQs)
`slack-gif-creator`	Create GIFs meeting Slack’s 2MB constraint

Meta-skills, Registries & Ecosystem Tools

Registries for Discovering Skills

Registry	Description
skills.sh	Vercel’s directory. De facto primary registry with leaderboard, trending, install commands. 1M+ monthly visitors
VoltAgent/awesome-agent-skills	Most comprehensive curated list: 383+ skills. 8,200+ stars
claude-plugins.dev	Auto-indexes all public GitHub repos with SKILL.md files. 52,466+ skills discovered
agentskills.io	The format specification (not a registry). Community-maintained
SkillsMP	Community marketplace. 350,000+ skills indexed with 2-star quality filter
SkillHub	7,000+ AI-evaluated skills with 5-dimension scoring (S-rank 9.0+)
LobeHub	Web marketplace with reviews and `npx @lobehub/market-cli` installer

CLI Tools for Managing Skills

Tool	Install	Purpose
Vercel skills CLI	`npx skills`	Universal CLI: add, list, find, remove. Supports 40+ agents
Tech Leads Club	`npx @tech-leads-club/agent-skills`	Security-hardened library with static analysis in CI/CD
CCPM	`npm i -g ccpm`	Claude Code Plugin Manager: ccpm install, ccpm search
OpenSkills	`npx openskills install`	Universal skills loader
SkillKit	`npx skillkit`	Install, translate, share across 40+ agents
agnix	Via npm	Linter for SKILL.md, CLAUDE.md, hooks — 156 rules, auto-fix, LSP server
Skill Seekers	GitHub	Convert docs/repos/PDFs into SKILL.md format

SKILL.md Format Specification (Summary)

The canonical spec at agentskills.io defines this structure:

my-skill/
├── SKILL.md # Required — YAML frontmatter + markdown instructions
├── references/ # Optional — deep reference docs
├── scripts/ # Optional — executable code (Python, Bash, JS)
└── assets/ # Optional — templates, images, binary files

Required YAML frontmatter fields: name (kebab-case, matches directory) and description (max 1024 chars). Optional: license, compatibility, metadata (author, version), allowed-tools. Claude Code extensions add model, version, disable-model-invocation, user-invocable, and mode.

Skills load via progressive disclosure: (1) Discovery — only frontmatter scanned at startup, (2) Activation — full SKILL.md body loaded when request matches description, (3) Execution — reference files and scripts loaded on demand. Keep SKILL.md under 500 lines / 5,000 tokens and push detailed content to references/.

Skill Budget and Performance Notes

Claude Code has an approximately 16,000-character budget for skill metadata at discovery time. With typical 263-character descriptions, only ~42 skills fit within this budget. Skills beyond the budget are completely invisible to Claude — they never get matched or loaded.

Practical implications:

If you install 50+ skills, compress descriptions to 130 characters each or fewer
Prioritize the highest-value skills for your current project rather than installing everything
Use project-scoped skills (.claude/skills/) for project-specific expertise and global skills (~/.claude/skills/) only for universally needed capabilities
The AvdLee SwiftUI + Concurrency + Core Data + Testing quartet plus obra/superpowers plus Vercel react-best-practices is a strong baseline that fits within budget

Recommended Install Set for Voxlight + Library of Babel

For a workflow spanning SwiftUI/SwiftData iOS (Voxlight) with AVAudioEngine and WKWebView, plus a PostgreSQL/pgvector Python backend (Library of Babel):

# iOS / SwiftUI core (AvdLee quartet)
npx skills add AvdLee/SwiftUI-Agent-Skill --skill swiftui-expert-skill
npx skills add AvdLee/Swift-Concurrency-Agent-Skill --skill swift-concurrency
npx skills add AvdLee/Core-Data-Agent-Skill --skill core-data-expert
npx skills add AvdLee/Swift-Testing-Agent-Skill --skill swift-testing-expert

# iOS 26 / Liquid Glass / AVAudioEngine
/plugin marketplace add CharlesWiltgen/Axiom

# SwiftUI Pro (Paul Hudson — concise, complementary to AvdLee)
npx skills add twostraws/SwiftUI-Agent-Skill --skill swiftui-pro

# React + design systems
npx skills add vercel-labs/agent-skills --skill react-best-practices
npx skills add google-labs-code/stitch-skills --skill shadcn-ui --global

# Anthropic official
/plugin marketplace add anthropics/skills
/plugin install example-skills@anthropic-agent-skills

# Database
npx skills add supabase/agent-skills

# Agentic workflow
/plugin marketplace add obra/superpowers-marketplace
/plugin install superpowers@superpowers-marketplace

~12 active skills, well within the 42-skill budget. Covers SwiftUI, Liquid Glass, Swift Concurrency, Core Data migration, AVAudioEngine (via Axiom), React/shadcn, PostgreSQL, and agentic development methodology.

Claude Code Skills Registry

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