Conciseness

Large stretches re-teach concepts Claude already knows: HTTP method semantics ('GET: Retrieve resources (idempotent, safe)'), REST basics, and generic best-practice lists ('Stateless: Each request contains all necessary information', 'Poor Documentation: Undocumented APIs frustrate developers'). Not a 3: the padding is not incidental — the Core Concepts and Best Practices sections are almost entirely redundant with Claude's built-in knowledge. Not a 1: it is organized into scannable lists rather than verbose prose paragraphs.

Actionability

Scattered concrete micro-guidance exists ('Use plural nouns for collections (/users, not /user)', 'Accept: application/vnd.api+json; version=1', 'Use DataLoaders', 'cursor-based pagination (Relay spec)'), but the body contains no worked examples, endpoint design patterns, or executable code — those all live in references/details.md and the orphaned bundle files. Not a 4: an engineer reading only SKILL.md could not execute an API review or design; the specifics are hints, not instructive examples. Not a 2: the URL/versioning snippets and named conventions do give some directly usable direction.

Workflow Clarity

There is no multi-step process anywhere: no sequence for designing an API, reviewing a specification, or applying the checklist, and no validation checkpoints (e.g., 'review against assets/api-design-checklist.md before finalizing'). Not a 1: content is coherently organized by topic and a usage-trigger section exists. Not a 3: not even an implicit step sequence or checkpoint exists to have gaps in.

Progressive Disclosure

The pointer to references/details.md is well signaled ('Read that file when the navigation tier above is insufficient') and one level deep — but of the five bundle files, four (references/graphql-schema-design.md, references/rest-best-practices.md, assets/api-design-checklist.md, assets/rest-api-template.py) are never mentioned in SKILL.md or in details.md, making them undiscoverable. Not a 4: orphaning most of the bundle is more than a 'minor organization gap'. Not a 2: the SKILL.md/references split itself is respected and the one reference that is given is clear, not buried.

Specificity

The description names the domain ("REST and GraphQL API design principles") and a few actions ("designing new APIs, reviewing API specifications, or establishing API design standards"), but the what-clause itself leans on adjectives ("intuitive, scalable, and maintainable APIs that delight developers") rather than concrete capabilities. Not a 4: no enumeration of specific concrete actions comparable to 'extracts text, fills forms, merges documents'. Not a 2: it goes beyond naming the domain by listing design/review/standards activities.

Completeness

Both parts are explicit: what ("Master REST and GraphQL API design principles to build... APIs") and when ("Use when designing new APIs, reviewing API specifications, or establishing API design standards"). Not a 5: the 'when' covers only three triggers and omits scenarios the body itself targets (refactoring APIs, REST-to-GraphQL migration, API documentation). Not a 3: the 'when' clause is explicit, not merely implied.

Trigger Term Quality

Natural terms users would say are present: "designing new APIs", "REST", "GraphQL", "API specifications", "API design standards". Not a 5: misses common variations and artifacts users would mention, such as 'endpoints', 'OpenAPI', 'Swagger', 'schema design', or 'API review'. Not a 3: coverage is good, not merely 'some relevant keywords'.

Distinctiveness Conflict Risk

"REST and GraphQL API design" carves a clear niche with distinct trigger phrases; conflict risk is limited to closely related skills (e.g., generic backend-development or documentation skills). Not a 5: 'API design standards' and 'reviewing API specifications' could plausibly overlap with documentation/standards skills. Not a 3: the REST/GraphQL framing is specific enough that mis-triggering is unlikely.