Frontend building block catalog — typed patterns for components, hooks, queries, mutations, stores, and models. ALWAYS read the relevant rule file before creating or modifying any building block in src/features/ or src/lib/. This includes spec implementation (read rule files for every block in the Building Blocks Diff), new feature work, refactoring, and architectural decisions.
Collaboratively write a feature spec with the developer. Trigger when a task involves 5+ unconstrained decisions, spans 10+ files, or the developer explicitly asks for a spec. Do NOT trigger for config edits, CSS fixes, helper functions, exploratory prototyping, presentation-only changes, or when the developer explicitly opts out.
Test building block catalog — typed patterns for Storybook play-function tests, Vitest hook tests, Vitest unit tests, MSW handlers, and test data fixtures. Read the relevant rule file before writing or modifying any test, handler, or fixture. Covers: deciding which kind of test to write, authoring a new test from scratch, adding MSW mocks or fixtures, and reviewing existing tests for conformance.
Use when creating page objects or refactoring Playwright E2E tests for better maintainability with Page Object Model patterns.
Refactor bloated AGENTS.md, CLAUDE.md, or similar agent instruction files to follow progressive disclosure principles. Splits monolithic files into organized, linked documentation.
You MUST use this before any creative work - creating features, building components, adding functionality, or modifying behavior. Explores user intent, requirements and design before implementation.
Create high-quality git commits: review/stage intended changes, split into logical commits, and write clear commit messages (including Conventional Commits). Use when the user asks to commit, craft a commit message, stage changes, or split work into multiple commits.
Smart dependency management for any language. Auto-detects project type, applies safe updates automatically, prompts for major versions, diagnoses and fixes dependency issues.