Development Claude Skills
8 676 development skills from 759 authors. They write and change code. Half of them fit into 1 830 tokens or less — that is what one costs your context window when the agent loads it. 1 213 ship runnable scripts rather than instructions alone. 42 of them cannot work without an MCP server, most often rube. We also found 1 172 copies of these same skills sitting in other people's repositories — counted once here, not 1 172 times.
8 676 unique 759 authors 5 252 updated this month 1 369 from vendors
Use when encountering dependency conflicts, CocoaPods/SPM resolution failures, "Multiple commands produce" errors, or framework version mismatches - systematic dependency and build configuration debugging for iOS projects. Includes pressure scenario guidance for resisting quick fixes under time constraints
Use when code signing fails during build, archive, or upload — certificate not found, provisioning profile mismatch, errSecInternalComponent in CI, ITMS-90035 invalid signature, ambiguous identity, entitlement mismatch. Covers certificate, profile, keychain, entitlement, and archive signing diagnostics.
Use when needing certificate CLI commands, provisioning profile inspection, entitlement extraction, Keychain management scripts, codesign verification, fastlane match setup, Xcode build settings for signing, or APNs .p8 vs .p12 decision. Covers complete code signing API and CLI surface.
Use when setting up code signing, managing certificates, configuring provisioning profiles, debugging signing errors, setting up CI/CD signing, or preparing distribution builds. Covers certificate lifecycle, automatic vs manual signing, entitlements, fastlane match, Keychain management, and App Store distribution signing.
Complete energy optimization API reference - Power Profiler workflows, timer/network/location/background APIs, iOS 26 BGContinuedProcessingTask, MetricKit monitoring, with all WWDC code examples
Reference — Complete Foundation Models framework guide covering LanguageModelSession, @Generable, @Guide, Tool protocol, streaming, dynamic schemas, built-in use cases, and all WWDC 2025 code examples
Use when ANY iOS build fails, test crashes, Xcode misbehaves, or environment issue occurs before debugging code. Covers build failures, compilation errors, dependency conflicts, simulator problems, environment-first diagnostics.
Use when implementing or debugging ANY network connection, API call, or socket. Covers URLSession, Network.framework, NetworkConnection, deprecated APIs, connection diagnostics, structured concurrency networking.
Use when needing SecItem function signatures, keychain attribute constants, item class uniqueness constraints, accessibility level details, SecAccessControlCreateFlags, kSecReturn behavior per class, LAContext keychain integration, or OSStatus error codes. Covers complete keychain API surface.
Use when implementing Liquid Glass effects, reviewing UI for Liquid Glass adoption, debugging visual artifacts, optimizing performance, or requesting expert review of Liquid Glass implementation - provides comprehensive design principles, API patterns, and troubleshooting guidance from WWDC 2025. Includes design review pressure handling and professional push-back frameworks
Use when converting shaders or looking up API equivalents - GLSL to MSL, HLSL to MSL, GL/DirectX to Metal mappings, MTKView setup code
Reference — Comprehensive Network.framework guide covering NetworkConnection (iOS 26+), NWConnection (iOS 12-25), TLV framing, Coder protocol, NetworkListener, NetworkBrowser, Wi-Fi Aware discovery, and migration strategies
Use when implementing Network.framework connections, debugging connection failures, migrating from sockets/URLSession streams, or adopting structured concurrency networking patterns - prevents deprecated API usage, reachability anti-patterns, and thread-safety violations with iOS 12-26+ APIs
Reference — PHPickerViewController, PHPickerConfiguration, PhotosPicker, PhotosPickerItem, Transferable, PHPhotoLibrary, PHAsset, PHAssetCreationRequest, PHFetchResult, PHAuthorizationStatus, limited library APIs
Use when you need complete SF Symbols API reference including every rendering mode, symbol effect, configuration option, UIKit equivalent, and platform availability - comprehensive code examples for iOS 17 through iOS 26
Reference — Complete StoreKit 2 API guide covering Product, Transaction, AppTransaction, RenewalInfo, SubscriptionStatus, StoreKit Views, purchase options, server APIs, and all iOS 18.4 enhancements with WWDC 2025 code examples
Use when reviewing or generating Swift code for modern idiom correctness — catches outdated APIs, pre-Swift 5.5 patterns, and Foundation legacy usage that Claude defaults to
Create a new skill in the current repository. Use when the user wants to create/add a new skill, or mentions creating a skill from scratch. This skill follows the workflow defined in .agents/skills/README.md and helps scaffold, validate, and sync new skills.
Use when user wants to create a GitHub issue for the current repository. Must read and follow the repository's issue template format.
Create or update GitHub pull requests using the repository-required workflow and template compliance. Use when asked to create/open/update a PR so the assistant reads `.github/pull_request_template.md`, fills every template section, preserves markdown structure exactly, and marks missing data as N/A or None instead of skipping sections.
React and Next.js performance optimization guidelines from Vercel Engineering. This skill should be used when writing, reviewing, or refactoring React/Next.js code to ensure optimal performance patterns. Triggers on tasks involving React components, Next.js pages, data fetching, bundle optimization, or performance improvements.
Analyzes codebases to understand structure, tech stack, patterns, and conventions. Use when onboarding to a new project, exploring unfamiliar code, or when asked "how does this work?" or "what's the architecture?
Designs REST and GraphQL APIs including endpoints, error handling, versioning, and documentation. Use when creating new APIs, designing endpoints, reviewing API contracts, or when asked about REST, GraphQL, or API patterns.
Manages Git workflows including branching, commits, and pull requests. Use when working with Git, creating commits, opening PRs, managing branches, resolving conflicts, or when asked about version control best practices.
React and Next.js performance optimization guidelines from Vercel Engineering. This skill should be used when writing, reviewing, or refactoring React/Next.js code to ensure optimal performance patterns. Triggers on tasks involving React components, Next.js pages, data fetching, bundle optimization, or performance improvements.
Automate AI ML API tasks via Rube MCP (Composio). Always search tools first for current schemas.
Automate API Bible tasks via Rube MCP (Composio). Always search tools first for current schemas.
Automate API Labz tasks via Rube MCP (Composio). Always search tools first for current schemas.
Automate API Ninjas tasks via Rube MCP (Composio). Always search tools first for current schemas.
Automate API Sports tasks via Rube MCP (Composio). Always search tools first for current schemas.
Automate Asin Data API tasks via Rube MCP (Composio). Always search tools first for current schemas.
Automatically creates user-facing changelogs from git commits by analyzing commit history, categorizing changes, and transforming technical commits into clear, customer-friendly release notes. Turns hours of manual changelog writing into minutes of automated generation.
Automate Countdown API tasks via Rube MCP (Composio). Always search tools first for current schemas.
Automate Currents API tasks via Rube MCP (Composio). Always search tools first for current schemas.
Automate Dictionary API tasks via Rube MCP (Composio). Always search tools first for current schemas.
Automate Eodhd Apis tasks via Rube MCP (Composio). Always search tools first for current schemas.
Automate Fidel API tasks via Rube MCP (Composio). Always search tools first for current schemas.
Automate Gender API tasks via Rube MCP (Composio). Always search tools first for current schemas.
Debug LangChain and LangGraph agents by fetching execution traces from LangSmith Studio. Use when debugging agent behavior, investigating errors, analyzing tool calls, checking memory operations, or examining agent performance. Automatically fetches recent traces and analyzes execution patterns. Requires langsmith-fetch CLI installed.
Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use when building MCP servers to integrate external APIs or services, whether in Python (FastMCP) or Node/TypeScript (MCP SDK).
Automate News API tasks via Rube MCP (Composio). Always search tools first for current schemas.
Automate NPM tasks via Rube MCP (Composio). Always search tools first for current schemas.
Automate Openweather API tasks via Rube MCP (Composio). Always search tools first for current schemas.
Automate Sslmate Cert Spotter API tasks via Rube MCP (Composio). Always search tools first for current schemas.
Automate The Odds API tasks via Rube MCP (Composio). Always search tools first for current schemas.
Automate Wolfram Alpha API tasks via Rube MCP (Composio). Always search tools first for current schemas.
Automate Zyte API tasks via Rube MCP (Composio). Always search tools first for current schemas.
Write, review, or improve Swift APIs using Swift API Design Guidelines for naming, argument labels, documentation comments, terminology, and general conventions. Use when designing new APIs, refactoring existing interfaces, or reviewing API clarity and fluency.