Conciseness

Dense and efficient throughout: no explanation of what DI is or other known concepts, tables carry the import-path and API data compactly, and it assumes Claude's competence. Not 5 because the TL;DR repeats the frontmatter description nearly verbatim, 'connective tissue' appears twice, and rule duplication exists between the 'Key rules' list under The Universal Pattern and the later 'Key Rules' section (dependencies-order matching and Feature.Interface typing each stated twice).

Actionability

Fully executable, copy-paste-ready TypeScript examples with real import paths covering the universal pattern, GraphQL schema with resolver-level DI, CLI command, Pulumi handler, multi-injection, optional dependencies, decorators, and composites. Not 4 because the examples include complete class definitions, registration code, and factory-specific details that cover the common cases end-to-end.

Workflow Clarity

A clear application sequence is present: detect context by file path (extensions/ vs packages/), pick import paths from the mapping table, write the class, and match the dependencies array to constructor order, with compile-time validation noted ("validates at compile time"). Not 5 because there are no explicit verification or error-recovery checkpoints (e.g., what error appears when dependencies mismatch, or how to confirm wiring). Not 3 because the sequence that exists is unambiguous and supported by lookup tables.

Progressive Disclosure

Section headers and tables give good in-file structure, but the entire ~380-line skill is one file with no bundle: the ~95-line Container API Reference and the advanced dependency options are inline reference material that belongs in separate reference files. Matches anchor 3 ('content that should be separate is inline') rather than 4, since no references/ split exists at all; not 2 because headers and navigation within the file are clear.

Specificity

Lists several concrete capabilities: "dependency injection, constructor injection, how to access Logger/BuildParams/IdentityContext, how to inject CMS use-cases (list/get/create/update/delete entries), or how the dependencies array works". Not score 5 because "The universal createImplementation DI pattern and all injectable services" mildly over-claims ('all injectable services') and omits several covered topics (decorators, composites, container registration).

Completeness

Explicitly answers both: what ("The universal createImplementation DI pattern and all injectable services") and when ("Use this skill when the developer is writing any Webiny extension and needs to understand...") with concrete trigger phrases enumerated. Not 4 because the 'when' clause is fully explicit and enumerates multiple concrete trigger conditions.

Trigger Term Quality

Comprehensive natural-term coverage including synonyms: "dependency injection", "DI pattern", "constructor injection", "dependencies array", "inject CMS use-cases", plus concrete service names (Logger, BuildParams, IdentityContext) and extension types (API, Admin, CLI, Infrastructure) a Webiny developer would naturally say. Not below 5 because no common synonym for this domain is missing.

Distinctiveness Conflict Risk

Clear niche (Webiny DI wiring) with distinct triggers like "dependencies array" and "constructor injection". Not 5 because it self-describes as "the connective tissue across all extension types", so it intentionally overlaps with sibling skills (webiny-custom-graphql-api, webiny-cli-extensions) for extension-type-specific DI questions. Not 3 because the domain is tightly scoped to Webiny DI, not broadly generic.