Conciseness

The body is dense, imperative procedural guidance with essentially zero explanation of concepts Claude already knows — every line is a domain-specific rule, path, or command. It sits at the score-4 anchor (efficient, minor trimming possible) rather than 5 because some rules are restated across sections: the Drop-commit convention appears in the feasibility table, the Plan 'Cleanup'/'Commits' sections, and again in the Implement phase, and the Skip/missing-endpoint proposal rule is similarly repeated. It is well above the score-3 anchor, whose 'unnecessary explanation' implies padding rather than this cross-referenced redundancy.

Actionability

The guidance is fully executable for the common cases: exact bash commands ("git log --all --format=\"%H %s\" --grep=\"^${TICKET}\"", "yarn test --repeat-each=10 <relative-spec-path>"), a copy-paste-ready mergeTests fixture example, exact helper names ("apiHelpers.headlessAdminSite.postSite", "apiHelpers.headlessAdminUser.postUserAccount"), and concrete Poshi-to-helper setup mappings. The score-5 anchor (copy-paste ready commands covering common cases) fits; the score-4 anchor's 'minor gaps' would require missing key details, and the only placeholders are in the plan template where they are the intended output format.

Workflow Clarity

Five named phases (feasibility, inventory, plan, implement, validate) are clearly sequenced and gated on user approval, with an exhaustive plan checklist ("every test from the inventory phase appears in either the Feasibility, Existing Coverage, or Per-Test Routing table") and explicit feedback loops: the failure-mode triage protocol in 'When a Spec Fails' with a fix-and-revalidate cycle, the mandatory flake check, and hard rules like "Never xfail, comment out, or weaken an assertion". Destructive operations (deleting test blocks, commits) have validation gates, satisfying the score-5 anchor including the batch/destructive cap.

Progressive Disclosure

Structure is good: a one-level-deep external reference is clearly signaled ("Follow .claude/rules/playwright.md ... Do not duplicate or restate those rules here — read the file and apply it") and config defaults are delegated to config.example.json rather than restated. It matches the score-4 anchor (good structure, references clear, minor organization gaps) but not 5: at ~410 lines, the per-layer implementation rules (Setup Mappings, Jest/JUnit/integration conventions, failure triage) are inlined in SKILL.md where a reference file split — which the skill itself demonstrates with playwright.md — would make the overview easier to navigate. No bundle directories (references/, scripts/, assets/) exist, so there is no multi-level nesting risk to penalize.

Specificity

The description lists multiple concrete actions with comprehensive coverage: "Migrate a Liferay Poshi .testcase file to its modern test layer (Playwright, Jest, JUnit unit, Java integration)", "Routes each test to the right layer", "consolidates compatible tests at write time", and "follows existing Playwright patterns from a configurable reference folder". It clearly matches the score-5 anchor (multiple specific concrete actions, comprehensive) and exceeds the score-4 anchor, which allows only minor coverage gaps — none are present.

Completeness

It explicitly answers both questions: the 'what' is the full migration workflow sentence, and the 'when' is the concrete trigger clause "Use when the user asks to migrate, port, or convert a Poshi .testcase to Playwright, Jest, or JUnit". This is exactly the score-5 anchor pattern; the score-4 anchor would require the 'when' to be less explicit, which it is not.

Trigger Term Quality

Trigger terms are comprehensive and natural: the verb synonyms "migrate, port, or convert", the file extension ".testcase", and the target framework names "Playwright, Jest, or JUnit" in the 'Use when' clause. This matches the score-5 anchor (comprehensive coverage including synonyms and file extensions); the score-4 anchor requires missing natural terms, and none are missing — a user asking to port Liferay Poshi tests would use these exact words.

Distinctiveness Conflict Risk

"Liferay Poshi .testcase" carves out a clear niche with distinct triggers — no other plausible skill would claim a request to port a Poshi testcase. Conflict risk is minimal, matching the score-5 anchor; the score-4 anchor's 'minor overlap risk with closely related skills' does not apply since the domain and trigger terms are unique to this skill.