Conciseness

Every section is functional and project-specific — the metadata contract ('lib/metadata/dcat.ts', 'dcat-profiles.ts'), a terse symptom/cause/fix error table, and compact per-config examples — with no explanation of concepts Claude already knows. Only mild duplication exists (the canonical workflow link appears in both Instructions and Resources; profile ids appear in the error table as well as in reference.md), which is not enough to drop below the 'lean and efficient' anchor.

Actionability

Provides concrete commands ('npm run generate:dcat', 'npx next build'), exact file paths ('pages/_document.tsx', 'dcat.config.json'), and exact invocations in all four Examples, but full executable detail is delegated to the externally hosted '.claude/commands/portaljs-add-dcat.md' described as 'the single source of truth. Read and follow it when executing' — a minor gap if that GitHub URL is unavailable. Not 3 because the summary steps plus references/reference.md are themselves largely executable; not 5 because the skill is not fully self-contained and lacks a copy-paste config or autodiscovery snippet.

Workflow Clarity

Ten clearly sequenced steps with explicit validation checkpoints — step 7 'Generate the feeds and check conformance … surface any missing mandatory fields', step 8 'confirm the JSON-LD parses, and cross-check that JSON-LD, Turtle, and RDF/XML agree; run SHACL validation', step 9 'Verify the build with npx next build; fix errors before reporting success' — plus an Error Handling table that supplies the fix-and-regenerate recovery loops. Matches the anchor for clear sequence, explicit validation, and error-recovery feedback loops.

Progressive Disclosure

The body is an overview that splits detail one level deep into the real, verified bundle file references/reference.md ('Profile registry, serialization formats, and validator details'), clearly signaled with a descriptive label in Resources; the profile registry table, serializer rules, and per-profile validator instructions all live in that file rather than inlined. No nested references and easy navigation across well-labeled sections.

Specificity

Lists multiple concrete actions with comprehensive coverage: 'emit standards-compliant DCAT catalog feeds (DCAT 2/3, DCAT-AP, DCAT-US, national profiles) in JSON-LD, Turtle, and RDF/XML at build, with autodiscovery and per-profile conformance checking'. Not 4 because the actions span the skill's entire scope (profiles, three serializations, autodiscovery, conformance) with no coverage gaps.

Completeness

Explicitly answers both questions: what ('Make a PortalJS portal harvestable … emit standards-compliant DCAT catalog feeds … with autodiscovery and per-profile conformance checking') and when ('Use when a portal needs to be harvested by data.europa.eu, data.gov, or a national open-data catalog') with concrete trigger phrases. Third-person/imperative voice throughout; no first- or second-person phrasing.

Trigger Term Quality

Natural terms a user would actually say are all present: 'harvested', 'data.europa.eu', 'data.gov', 'national open-data catalog', 'DCAT', 'open-data portals'. Not 4 because for this niche no meaningful synonyms or variations are missing — the trigger names the exact harvesters and the exact standard.

Distinctiveness Conflict Risk

Scoped to 'a PortalJS portal' and to specific named harvesters (data.europa.eu, data.gov, national open-data catalogs) plus DCAT profiles — a clear niche with distinct triggers and minimal conflict risk against generic portal or RDF skills.