AccessorySetupKit for privacy-preserving discovery and setup of Bluetooth, Wi-Fi, or Wi-Fi Aware accessories. Use for discovery sessions, picker-based authorization, migration, accessory renaming...

Evidence before claims, always. No completion claims without fresh verification. The final gate before declaring success.

Create interactive data visualizations using Vega-Lite declarative JSON grammar. Supports 20+ chart types (bar, line, scatter, histogram, boxplot, grouped/stacked variations, etc.) via templates...

Use when you need to check feature flag states, compare channels, or debug why a feature behaves differently across release channels.

Use when you want to validate changes before committing, or when you need to check all React contribution requirements.

Use when you have lint errors, formatting issues, or before committing code to ensure it passes CI.

Use when you need to run Flow type checking, or when seeing Flow type errors in React code.

Use when feature flag tests fail, flags need updating, understanding @gate pragmas, debugging channel-specific test failures, or adding new flags to React.

Use when adding new error messages to React, or seeing "unknown error code" warnings.

Use when you need to run tests for React core. Supports source, www, stable, and experimental channels.

Design and compose Effect layers for clean dependency management

Implement Effect services as fine-grained capabilities avoiding monolithic designs

Generate comprehensive predicates and orders for domain types using typeclass patterns

Decide between Context Tag witness and capability patterns for dependency injection, understanding coupling trade-offs

Guidelines for developing with Sequelize, a promise-based Node.js ORM supporting PostgreSQL, MySQL, MariaDB, SQLite, and SQL Server

Master Effect pattern matching using Data.TaggedEnum, $match, $is, Match.typeTags, and Effect.match. Avoid manual _tag checks and Effect.either patterns. Use this skill when working with...

Implement typeclasses with curried signatures and dual APIs for both data-first and data-last usage

Implement the complete spec-driven development workflow from instructions through requirements, design, and implementation planning. Use this skill when starting new features or major refactorings...

Expert guidance on manipulating TYPO3 records via the DataHandler, ensuring transactional safety, PSR-14 event handling, and reference index integrity.

Execute system commands and manage processes using Effect's Command module from @effect/platform. Use this skill when spawning child processes, running shell commands, capturing command output, or...