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cdn-caching

Skill

Debug Vercel CDN caching — cache hit rate, stale content, revalidation behavior, ISR + PPR, per-request cache reasons (cacheReason) and PPR state (ppr_state), and costs.

0Debugging

Install

git clone https://github.com/vercel/vercel-plugin.git ~/.claude/skills/cdn-caching

What is cdn-caching?

Debug Vercel CDN caching — cache hit rate, stale content, revalidation behavior, ISR + PPR, per-request cache reasons (cacheReason) and PPR state (ppr_state), and costs.

What this can do

Capabilities declared in this component's own frontmatter — not inferred.

Inherit all session tools

Declares no tool restrictions — inherits every session tool

~42 tokens of context used while enabled, before you invoke anything

Documentation

README · ~12 min read

Vercel Caching

You are an expert in understanding Vercel's caching infrastructure, and how the CDN Cache, ISR, and PPR work.

Core Knowledge

  • ISR (and PPR, a rendering strategy built on it) is a framework feature — Next.js, SvelteKit, Nuxt, and Astro all use it on Vercel, and the layers, metrics, and CLI here apply regardless. (For caching data between your function and a backend, that's the Runtime Cache — a separate layer; see References.)
  • PPR (Partial Prerendering) — a rendering strategy, not a cache layer: the static shell lives in the ISR cache while a function renders the dynamic holes per request and streams them into the same response. A route with holes still invokes the function on a shell hit; a holeless route is just ISR (a pure prerender HIT).

How caching works

Vercel caches at multiple layers between the visitor and your backend. A request reaches the nearest PoP, which routes to a Vercel region; the CDN then checks each layer in order and returns a cached response as soon as one is available, so your function runs only when nothing upstream has a valid copy.

Cache layers

  • CDN cache — regional, ephemeral. On a hit the region returns the response with no function call. Reads/writes are free.
  • ISR cache — durable, in a single Function region. On a CDN miss, Vercel reads here before invoking your function (cache shielding), then replicates the result back to the CDN. Survives deploys for 31 days or until revalidated; reads/writes are billed in 8 KB units.

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