playbook/antigravity-awesome-skills/skills/vercel-optimize/references/support-topics/post-response-work-waituntil.md

id	title	status	candidateKinds	frameworks	priority	citations	maxBriefChars
post-response-work-waituntil	Post-response work with waitUntil	active	slow_route external_api_slow	next@<15.0.0 sveltekit@* astro@* nuxt@* unknown@*	78	https://vercel.com/docs/functions/functions-api-reference/vercel-functions-package	800

Investigation Brief

For stacks without Next.js after(), check whether non-critical work can run after the response instead of extending user-visible latency.

Evidence To Check

Inspect the listed route for analytics, logging, notifications, cache warming, metrics, or webhook side effects that happen after the response data is ready.

Do Not Recommend When

Do not move work that decides the response, must fail the request, changes visible state synchronously, or needs a durable retry guarantee.

Verification

Name the blocking side effect, the observed latency or upstream signal, and the exact line that can move behind waitUntil.