Conciseness

Much of the body adds real value (BIEN/MAL contrasts, pagination trade-off tables, versioning deprecation timeline), but several sections restate knowledge Claude already has — the HTTP method idempotency/safety table, the full status-code meanings list (200 OK, 404 Not Found), and basic OFFSET/LIMIT SQL — fitting anchor 3's "mostly efficient but includes some unnecessary explanation".

Actionability

Guidance is overwhelmingly concrete — copy-paste URL patterns, JSON envelope examples, and full TypeScript/Python/Go implementations — but there are minor gaps: the Go example calls undefined writeError/writeJSON helpers and the DRF example uses IsAuthenticated without importing it, matching anchor 4 rather than fully executable anchor 5.

Workflow Clarity

The reference is well organized with a "Cuándo Activar" section, a numbered versioning strategy, and a final pre-publish checklist ("Antes de publicar un nuevo endpoint") serving as an explicit validation checkpoint — but there is no sequenced workflow for designing a new endpoint, so it fits anchor 4 with minor validation gaps rather than anchor 5's explicit feedback loops.

Progressive Disclosure

Section headers are clear, but all ~520 lines live inline in SKILL.md with no reference files at all; content that clearly belongs in separate files (the ~100 lines of per-language implementation examples, the detailed filtering/sorting reference) is inlined, matching anchor 3's "content that should be separate is inline".

Specificity

The description lists several specific concrete areas — "nomenclatura de recursos, códigos de estado, paginación, filtrado, respuestas de error, versionado y rate limiting" — giving comprehensive topical coverage, but they are scope nouns rather than actions and areas like authentication are omitted, matching anchor 4 rather than 5.

Completeness

The "what" is clear (REST API design patterns across seven named areas), but there is no "Use when..." clause or equivalent trigger guidance anywhere in the description, which caps completeness at 3 per the judging guidelines.

Trigger Term Quality

Good keyword coverage with natural terms users would say — "REST API", "paginación", "versionado", "filtrado", "rate limiting" (kept in English, as users would) — but common variations like "endpoints"/"diseño de endpoints" are missing, fitting anchor 4 rather than the comprehensive synonym coverage of anchor 5.

Distinctiveness Conflict Risk

"Patrones de diseño REST API" with triggers like paginación, versionado, and rate limiting carves a mostly distinct niche; only minor overlap risk with closely related skills such as general backend/web-service or GraphQL design skills, matching anchor 4.