Keynote Feature: Toolbar & Feature Flags

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" summary

Vercel shows a live toolbar that turns every commit into a preview deployment with sharable URLs, inline comments, an inbox and presence, and direct integrations to Linear, Jira, Slack and Contentful draft mode so marketing edits preview before going live. Built-in dev tools surface accessibility audits, core web vitals and an OG card. A new toggle lets teams flip feature flag overrides from providers like Optimizely, LaunchDarkly or Split — used 20,000+ times by Perplexity and Leonardo AI — plus analytics and a flags SDK for Next.js (SvelteKit soon).

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