opencastle

Vitest unit and integration testing patterns, commands, mocking (vi.mock), and coverage. Use when writing .test.ts files, configuring the test runner, or adding coverage thresholds.

Levers for writing documents an agent consumes: context pointers, the two loads, information hierarchy, progressive disclosure, completion criteria, leading words, and pruning. Use when creating or editing a skill, an agent definition, an instruction file, AGENTS.md, or CLAUDE.md.