Conciseness

The body is lean and well-sectioned with no padding, but the opening paragraph ("Integration tests that require both services running at the same time are slow, brittle, and hard to maintain...") explains a concept Claude already knows and is duplicated verbatim in references/rule.md's 'Why It Matters' section — a minor instance of over-explanation that could be trimmed, placing it just below anchor 5.

Actionability

The Fix section names the exact tools and targets ("Pact consumer tests for the frontend API client", "publish the contracts to a broker", "provider verification to the backend CI pipeline") and Code Review gives concrete flags ("any-type matchers on fields the consumer actually uses", "missing status code assertions"), with fully executable code one clearly-signaled reference away. The body itself contains no commands or code, which is the minor gap keeping it below anchor 5.

Workflow Clarity

The Quick Reference lays out the lifecycle sequence (consumer writes tests → publish to broker → verify against provider → CI fails before deploy) and Fix sequences the three implementation steps, but validation checkpoints are only implicit in the body — there is no 'run this, confirm that, then proceed' guidance. The explicit verification steps exist only in references/rule.md's Verification section, matching anchor 3 (sequence present, checkpoints missing or implicit).

Progressive Disclosure

The bundle structure matches the ideal: SKILL.md is a concise overview (Check/Fix/Explain/Code Review), all implementation detail lives in exactly one reference (references/rule.md, verified to exist), and it is clearly signaled at the end with an accurate framing ('For full implementation details, code examples, and framework-specific guidance'). One level deep, easy to navigate, nothing inlined that belongs in the reference.

Specificity

The description names the domain clearly ("contract tests", "frontend-backend API boundary") and lists three concrete usage scenarios ("setting up integration testing", "evaluating whether two services are safe to deploy independently", "replacing slow end-to-end tests"), but never states what the skill actually does (e.g., write Pact consumer tests, publish to a broker, verify the provider). It sits between anchor 2 (domain named, generic actions) and anchor 4 (several specific skill actions) — the scenarios are concrete but they are triggers, not capability actions.

Completeness

The 'when' is fully explicit and specific (three well-formed 'Use when/or' clauses), but the 'what' is only implied through those triggers — no statement of the skill's capabilities. This is noticeably above anchor 2's vague 'Use when working with documents' (only 'when', no 'what') but lacks the explicit 'what' that anchor 4 requires.

Trigger Term Quality

Good natural keyword coverage: "integration testing", "end-to-end tests", "contract tests", "safe to deploy independently" — phrases users would plausibly say. A few common terms are missing, notably "Pact", "consumer-driven contracts", "API contract", and "broker", so it does not reach the comprehensive synonym coverage of anchor 5.

Distinctiveness Conflict Risk

Contract testing at a frontend-backend API boundary is a clear niche with distinct triggers. Minor overlap risk remains: 'setting up integration testing' and 'replacing slow end-to-end tests' could also match a general integration-testing or e2e-testing skill, keeping it just below anchor 5's minimal-conflict bar.