Conciseness

The body is dense and nearly every token is Webiny-specific knowledge Claude would not already have (props table, Response builder semantics, cookie maxAge-in-seconds caveat, "How it works"). It falls short of the lean 5 anchor mainly through repetition — route-name derivation is stated in the Props table and again in the "Change what a route DOES" section ("name is routeName, or the value derived from path and method"), and the request.route identity point is made twice — which is over-explanation that could be trimmed, but it is well above the noticeably-verbose 2 and the mostly-efficient-with-real-excess 3 anchors.

Actionability

Fully executable, copy-paste-ready code throughout: a complete handler with createImplementation and DI wiring, the registration JSX, a parameterized route handler, two full decorator implementations, plus a props table and a Quick reference block with the exact deploy command. Not level 4 because there are no gaps — the common cases (plain handler, path parameters, auth decorator) are all covered with runnable code.

Workflow Clarity

The sequence is clear — write a handler implementing HttpRouteHandler.Interface, point <Api.Route> at it in webiny.config.tsx, deploy with "yarn webiny deploy api --env=dev" — and the TL;DR states it up front with hard-fail warnings (missing .ts extension fails the build; named exports fail). It is not 5 because the deploy/verify tail of the workflow is confined to a one-line Quick reference entry with no explicit ordering of build vs. deploy steps or a post-deploy check that the route responds; it is above 3 because the sequence and its key failure modes are explicit, and the skill involves no destructive or batch operations requiring feedback loops.

Progressive Disclosure

No bundle files exist (no references/, scripts/, or assets/), and all content is inline in one well-sectioned file with a TL;DR up front, a Quick reference at the end, and a Related-skills section pointing to sibling skills one hop away. Structure is good and easy to navigate; it is not 5 because at ~240 lines the two decorator examples and the Response method table are reference-grade material that could be split into separate files to keep SKILL.md lean, and not 3 because nothing is buried or misplaced — every section is clearly signaled and appropriately scoped.

Specificity

The description lists multiple concrete actions — "expose a custom HTTP endpoint (GET, POST, PUT, etc.)", "implement a route handler with full DI support", "register a custom HTTP route in webiny.config.tsx" — and names the specific mechanisms (<Api.Route>, HttpRouteHandler). This matches the comprehensive-coverage anchor; it is not the level-4 anchor because coverage of the skill's actions is complete rather than having minor gaps.

Completeness

It explicitly answers both: what ("Adding custom HTTP routes to the API with <Api.Route> and HttpRouteHandler") and when ("Use this skill when the developer wants to expose a custom HTTP endpoint... or register a custom HTTP route in webiny.config.tsx"). The 'when' clause is explicit with concrete trigger conditions, matching the top anchor; it is clearly above the level-4 anchor where the 'when' is only partially specific.

Trigger Term Quality

Good natural-term coverage: "custom HTTP endpoint", "GET, POST, PUT", "route handler", "custom HTTP route", "webiny.config.tsx". A few natural phrasings a user might say are missing (e.g., "REST endpoint", "webhook", "API route"), so it sits between the good-coverage (4) and comprehensive-with-synonyms (5) anchors, closer to 4.

Distinctiveness Conflict Risk

It carves a clear niche with distinct triggers: Webiny-specific terms ("webiny.config.tsx", "HttpRouteHandler", "alongside the GraphQL handler") make it unlikely to fire for the wrong skill. Minimal conflict risk, matching the clear-niche anchor; the level-4 anchor's "minor overlap risk with closely related skills" does not apply given the unique component names.