Conciseness

The content is Webiny-specific (not knowledge Claude already has) and avoids generic-concept padding, but the same facts are stated three times across 'TL;DR', 'Key Rules', and 'Quick Reference', and every code example re-includes the full class + createImplementation + export-default scaffold. This is 'efficient; minor instances of over-explanation that could be trimmed' (4) rather than the lean 5 anchor where every token earns its place.

Actionability

Fully executable, copy-paste-ready TypeScript examples progress from a hello-world resolver through per-resolver DI, UseCase injection with Response/ErrorResponse, namespaced mutations, dynamic CMS input generation, and a permission transformer — plus concrete registration (<Api.Extension src=...>) and deploy ('yarn webiny deploy api --env=dev') commands. This matches the 5 anchor: 'copy-paste ready code... specific examples cover the common cases'.

Workflow Clarity

The sequence is clear (implement GraphQLSchemaFactory.Interface → export default → register as <Api.Extension> → deploy) and the Namespaced Mutation Pattern gives explicit numbered steps, but there is no verification checkpoint after deploy or build. It fits 'clear sequence with most checkpoints present; minor validation gaps' (4) rather than the 5 anchor with explicit validation and feedback loops; this is not a destructive/batch skill, so no cap applies.

Progressive Disclosure

Sections are well-organized with clear headers, a TL;DR, and a Quick Reference, and the 'Related Skills' section signals cross-skill navigation. However, the single ~390-line file inlines peripheral patterns (Permission Transformer, Dynamic Input Fields from CMS Model) that belong in separate reference files, since no references/ bundle exists. This fits 'good structure; most content appropriately placed; minor organization gaps' (4) rather than the well-split 5 anchor.

Specificity

The description lists multiple concrete actions — 'add custom GraphQL endpoints, create custom queries or mutations, add business logic to the API layer, build custom resolvers, inject backend services (identity, tenancy, CMS use-cases)... build dynamic GraphQL inputs from CMS models' — with comprehensive coverage from 'simple queries to complex resolvers with dependency injection and permission transformers'. This matches the 5 anchor ('multiple specific concrete actions; comprehensive coverage') and exceeds the 4 anchor's 'minor gaps in coverage'.

Completeness

It clearly answers both: what ('Adding custom GraphQL queries and mutations using GraphQLSchemaFactory') and when ('Use this skill when the developer wants to add custom GraphQL endpoints, create custom queries or mutations, ...'), with concrete trigger phrases. This matches the 5 anchor exactly; the 4 anchor requires a 'when' that 'could be more explicit', which does not apply here.

Trigger Term Quality

Good natural keyword coverage: 'custom GraphQL endpoints', 'create custom queries or mutations', 'build custom resolvers', 'inject backend services' are phrases users would naturally say. A few natural terms are missing — synonyms like 'extend the GraphQL API', 'add a mutation to the API', or the platform name 'Webiny' itself — so it fits the 4 anchor rather than the comprehensive 5 anchor.

Distinctiveness Conflict Risk

The GraphQLSchemaFactory / resolver / permission-transformer niche is mostly distinct with clear triggers, but the description never names 'Webiny', so generic requests like 'add a GraphQL mutation to my API' outside the Webiny context could overlap with other GraphQL-related skills. This fits 'mostly distinct; minor overlap risk with closely related skills' (4) rather than the minimal-conflict 5 anchor.