Write cutting-edge and modern native CSS. Apply this skill whenever writing, reviewing, or refactoring CSS for components, layouts, design systems, or theming, even if the user doesn't say "modern CSS" explicitly. Covers a self-contained design-token scale…
Apply this skill whenever the task involves web security: writing or auditing HTTP security headers, configuring CSP, CORS, HSTS, or Permissions-Policy, sanitising untrusted HTML (Sanitizer API / DOMPurify), implementing Trusted Types to prevent DOM-XSS,…
Patterns for invoking the GitHub CLI (gh) from agents. Covers structured output, pagination, repo targeting, search vs list, gh api fallback.
Audit and update durable architecture guidance after a cross-layer implementation, file move, package boundary change, coverage config change, or SDTE feature. Use when agent needs to reconcile AGENTS.md, package AGENTS.md files, local .agents/skills, older…
Run the Spec → Design → Tasks → Execution workflow for non-trivial work — produces /specs/<feature>/{spec,design,tasks}.md, drives atomic per-task execution, and ends with a Review phase. Invoke when starting a new package, new game system, GameState shape…
Best practices for building scalable plain Web Components without turning custom elements into “god objects”. Provides patterns that keep Web Components modular, reusable, maintainable, and focused on UI concerns.
Common patterns and best-practices for writing tests (unit tests & E2E tests)
Safely evolve GameState shape — bump stateVersion, write a pure migration function, update replay fixtures and snapshot baselines