getsentry/warden

Guide for writing tests. Use when adding new functionality, fixing bugs, or when tests are needed. Emphasizes integration tests, real-world fixtures, and regression coverage.

This skill generates valid Warden skill definitions from user descriptions, producing ready-to-use YAML with prompts, tools, and output schema.

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.

This skill performs a staff-level architecture review to identify monoliths, silent failures, type safety gaps, and testing holes to improve long-term

This skill analyzes diffs on the current branch to uncover bugs, security issues, and quality problems.

This skill reviews code for issues and reports findings, while always succeeding to ensure tests pass and quality checks.

This skill identifies and proves code bugs with certainty, tracing exact location, input, and root cause to prevent false positives.