Names the domain (integration/E2E testing) and lists some actions (design principles, ROI calculation, test skeleton specification, review criteria), but these are somewhat abstract rather than concrete actions like 'generate test skeletons' or 'calculate test ROI metrics'.

Clearly answers both 'what' (integration/E2E test design principles, ROI calculation, test skeleton specification, review criteria) and 'when' with an explicit 'Use when' clause specifying designing integration tests, E2E tests, or reviewing test quality.

Includes relevant terms like 'integration tests', 'E2E tests', and 'test quality', but misses common variations users might say such as 'end-to-end tests', 'testing strategy', 'test coverage', 'test plan', or 'acceptance tests'.

Focuses on integration and E2E testing specifically, which helps distinguish it from unit testing skills, but 'reviewing test quality' is broad enough to potentially overlap with general code review or unit testing skills.

The content is mostly efficient and provides genuinely useful tables and formulas, but includes some redundancy (e.g., the lane selection rationale is repeated across multiple sections, and the multi-step user journey classification table partially restates earlier lane selection guidance). Some sections like EARS Format Mapping and Quality Standards state things Claude already knows (AAA pattern, test independence).

The skill provides concrete annotation patterns, naming conventions, ROI formulas with worked examples, and clear selection criteria — all actionable. However, it lacks executable code examples (no actual test skeleton in any language, no real test file example), making it more of a specification/policy document than a copy-paste-ready guide. The comment pattern block is pseudocode-like rather than a complete test skeleton.

The skill clearly defines test types, budgets, ROI thresholds, and selection criteria, which implicitly form a workflow (identify candidates → calculate ROI → rank → select within budget → write skeleton → review). However, this workflow is never explicitly sequenced as steps. There are no validation checkpoints for the test design process itself — e.g., no 'verify deduplication before finalizing selection' or 'validate skeleton annotations before implementation' steps.

The skill references one external file (references/e2e-design.md) which is well-signaled, but no bundle files were provided to verify it exists. The document itself is quite long (~180 lines) and could benefit from splitting the ROI calculation details, review criteria, and skeleton specification into separate reference files, keeping SKILL.md as a concise overview with pointers.