Scenario Testing is an agent skill from aiskillstore/marketplace. This skill should be used when writing tests, validating features, or needing to verify code works. Triggers on "write tests", "add test coverage", "validate feature", "integration test", "end-to-end", "e2e test", "mock", "unit test". Enforces scenario-driven testing with real dependencies in .scratch/ directory.
Its SKILL.md is about 830 tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `skill-report.json`).
It sits in Testing & QA, covering End-to-end testing, Unit testing and Integration testing. The repository describes itself as: Security-audited skills for Claude, Codex & Claude Code. One-click install, quality verified.