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Vercel build container

System-initiated requests made from Vercel's build container during a build
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What is Vercel build container?

Vercel build container is a link preview bot. System-initiated requests made from Vercel's build container during a build

Vercel build container controls how your links look when they are shared. Rich previews drive clicks across social and messaging platforms, and clean preview metadata also helps AI systems parse your pages. Allowing it keeps your content looking polished wherever it appears.

Like any automated client, Vercel build container consumes crawl budget and appears in your server and CDN logs. Reviewing those logs alongside your robots.txt rules helps you keep automated traffic deliberate and easy to reason about.

Want to see every AI bot hitting your site? Promptwatch turns your server and CDN logs into a live view of AI crawler and agent traffic, so you can watch ChatGPT, Claude, Perplexity, Gemini, and others crawl your pages and connect those visits to real citations and revenue. Learn more in AI crawler logs.

See every AI bot hitting your site

Promptwatch turns your server and CDN logs into a live view of AI crawler and agent traffic. Watch ChatGPT, Claude, Perplexity, Gemini, and more crawl your pages in real time, see exactly what they take, and connect every crawl to the citations and revenue it drives.

How to handle Vercel build container

You will usually want Vercel build container allowed so shared links render rich previews. Block it only if you do not want preview cards generated for your pages.

To control Vercel build container, add a rule for its user agent to your robots.txt:

User-agent: Vercelbuildcontainer
Disallow: /

Replace the user-agent token above with the exact string Vercel build container sends, check the operator's documentation, since display names and user-agent tokens can differ.

Vercel build container generally honors robots.txt directives.

Examples

  • When a user shares a link, Vercel build container fetches the page's Open Graph tags to build a rich preview card.
  • A team adds Open Graph and image metadata so Vercel build container renders an attractive preview for shared URLs.

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Frequently asked questions about Vercel build container

Learn about AI visibility monitoring and how Promptwatch helps your brand succeed in AI search.

Vercel build container is a link preview bot; its operator is identified in its user-agent string and public documentation.

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