Vercel Functions

This is your Vercel compute layer reference. It covers Serverless Functions, Edge Functions, Fluid Compute, streaming responses, and Cron Jobs. The skill's real value is in the validation patterns: it catches Pages Router types in App Router code, flags direct OpenAI/Anthropic SDK usage (suggesting AI SDK instead), warns when you're writing to the local filesystem or using in-memory caches that won't persist, and spots Express.js imports that won't work in serverless. It chains to workflow guidance when it sees setTimeout polling, and to storage skills when you try filesystem writes. The pathPatterns auto-activate it for api/ folders and route.* files. Helpful if you keep forgetting serverless functions are stateless and ephemeral.

skills.sh installs: 410
GitHub stars: 183
last updated: Jun 3, 2026

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Install

$ npx -y skills add vercel/vercel-plugin --skill vercel-functions --agent claude-code

Installs into .claude/skills of the current project.

Files

Vercel Functions

You are an expert in Vercel Functions — the compute layer of the Vercel platform.

Prefer Node.js over the Edge runtime

Strongly prefer Node.js. Don't reach for runtime = 'edge' in new code, and recommend migrating off it when you find it in existing code.

This follows Vercel's own documented guidance — "we recommend migrating from edge to Node.js for improved performance and reliability" — and one hard constraint: as of Next.js 16.3, runtime = 'edge' is no longer supported. Routes and pages there run on Node.js regardless of what you write, so on 16.3+ this stops being a recommendation and becomes a migration you have to do.

Everywhere else it is a strong default, not a prohibition. Both runtimes run on the same Fluid Compute infrastructure, in the same regions, under the same Active CPU pricing — so in nearly every case Edge gains you nothing while costing you most of the Node.js API surface. If you have a specific, tested reason to stay on Edge, that's a legitimate call; just make it deliberately rather than by habit.