Conciseness

The body is lean and expert-level throughout: no padding, no explanation of concepts Claude already knows, and every sentence carries non-obvious information (e.g., 'Routing into a service is final. If the selected service returns a 404 or 405, Vercel does not try the next top-level rewrite'; 'Native Go and Rust runtime services cannot currently consume bindings'). Even the Beta note is actionable instruction ('Say so when you recommend it'), matching the 'every token earns its place' anchor.

Actionability

Fully executable guidance: multiple copy-paste-ready vercel.json examples covering the common cases (frontend+backend with bindings, prefix stripping, SPA catch-all, host-matched subdomain), concrete commands (`vercel dev`, `vercel dev -L`, `vercel`), a runtime bindings code snippet, and specific field-level directions (`root`, `entrypoint`, `runtime: "container"`, `format: "url"`).

Workflow Clarity

Sections form a clear sequence (choose structure → define services → route → bind → develop/deploy → troubleshoot), and the Troubleshoot section is a symptom-to-fix feedback loop for error recovery. It falls short of 5 because the happy path has no explicit validation checkpoint (e.g., no 'after deploying, verify /api reaches the backend' step) — verification is left to the after-the-fact Troubleshoot list.

Progressive Disclosure

Well-organized sections with the one genuinely separable concern (the legacy `experimentalServices` model) split into a real, one-level-deep reference file that is clearly signaled at both mention points ('read [references/experimental-services.md] before changing it'). The remaining content is core workflow guidance that belongs inline, matching the 'clear overview with well-signaled one-level-deep references' anchor.

Specificity

The description names the domain ('Vercel Services for multiple frontends and backends in one project') and lists several concrete actions and artifacts ('Configure and troubleshoot', 'defining the `services` key, service-targeted rewrites, or service bindings in `vercel.json`', 'running all services with `vercel dev`'), matching the 'several specific actions; minor gaps' anchor. It falls short of 5 because the capability verbs are only 'configure' and 'troubleshoot', and above 3 because specific sub-tasks and config artifacts are explicitly enumerated.

Completeness

It clearly answers both 'what' ('Configure and troubleshoot Vercel Services for multiple frontends and backends in one project') and 'when' via an explicit 'Use when composing a polyglot or multi-service application... defining the `services` key... or running all services with `vercel dev`' clause with concrete trigger phrases.

Trigger Term Quality

Good natural keyword coverage: 'multiple frontends and backends', 'polyglot', 'multi-service application', 'services key', 'service bindings', 'vercel.json', and 'vercel dev' are all phrases users would naturally say. A few common terms are missing (e.g., 'monorepo', 'microservices'), which fits the 'good coverage; a few natural terms missing' anchor rather than the comprehensive synonym-and-extension coverage of 5.

Distinctiveness Conflict Risk

The description is anchored to a named product feature with distinct triggers (`services` key, service-targeted rewrites, service bindings in `vercel.json`, `vercel dev`), and phrases like 'in one project' and 'one Vercel deployment' separate it clearly from adjacent skills such as microfrontends or general deployment skills — minimal conflict risk.