The body is dense with actionable technical content and assumes Claude's competence throughout, with no padding explaining HTTP, DI, or Fastify; every section (TL;DR, props table, interfaces, key rules, quick reference) earns its place, matching the score-3 'lean and efficient' anchor rather than the score-2 'could be tightened'.

Provides fully executable TypeScript examples with real imports, a complete props reference table, concrete interface definitions, exact registration JSX, and a copy-paste-ready Quick Reference, matching the score-3 'fully executable code; copy-paste ready' anchor rather than the score-2 'pseudocode instead of executable code'.

The single-pattern workflow (write handler -> export default -> register in config -> deploy) is unambiguous and reinforced by explicit 'YOU MUST' guardrails acting as checkpoints ('Omitting the file extension will cause a build failure'); per the simple-skill scoring note an unambiguous single action can score 3, though a concrete validate/retry command for the deploy step is the one thing that could push it beyond an implicit checkpoint.

No bundle files exist and none are needed; the body is a single self-contained file well-organized into clearly labeled sections, which per the under-50-line / no-external-references guideline scores 3, matching the 'clear overview with well-organized sections' anchor rather than the score-2 'content that should be separate is inline'.

Lists multiple concrete actions with named framework primitives ('Adding custom HTTP routes to the API using Api.Route and Route.Interface', 'implement Route.Interface with full DI support', 'register a custom HTTP handler in webiny.config.tsx'), matching the 'lists multiple specific concrete actions' anchor rather than the score-2 'names domain and some actions'.

Explicitly answers both 'what' ('Adding custom HTTP routes to the API using Api.Route and Route.Interface') and 'when' via a clear 'Use this skill when the developer wants to...' trigger clause, matching the score-3 anchor instead of the score-2 case where 'when' is only implied.

Includes natural developer-facing terms ('custom HTTP endpoint', 'GET, POST, PUT', 'API Gateway', 'custom HTTP handler') that a user would naturally say, with good coverage of method variations, fitting the score-3 anchor rather than the score-2 'some relevant keywords but missing common variations'.

Scoped to a clear niche (custom HTTP routes on the API Gateway alongside the GraphQL handler) with specific primitives (Api.Route, Route.Interface, webiny.config.tsx), making it distinct from sibling GraphQL skills and unlikely to trigger for the wrong skill, matching the score-3 anchor.