tsdown fast TypeScript library bundler powered by Rolldown and Oxc. Use when bundling TypeScript libraries, configuring entry points, or generating .d.ts declaration files.

Provides guidance for performing causal interventions on PyTorch models using pyvene's declarative intervention framework. Use when conducting causal tracing, activation patching, interchange...

Generates and executes skill enhancement plans using declarative project configuration and validation loop protocols.

Mandatory incident fix verification with observables. Invoke after: applying production fixes, before declaring incidents resolved, when someone says 'I think that fixed it'. Requires log entries,...

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

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

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

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

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

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

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...