Show HN: Persona.js – a vanilla-JS agent UI library with native WebMCP (MIT)

1 sources1 storiesFirst seen 6/20/2026Score16Mixed Progress

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My cofounder and I are formally open sourcing (MIT) persona.js.

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It's a VanillaJS library that helps anyone build agentic experiences on the web, without a framework dependency, and full WebMCP supportSo, why'd we do this?1) We're super fans of the web and the browser can do a ton today2) We've seen AI builds be way overly complex because the FE requires a large project within an existing app OR the site wasn't using a framework to begin withIf you've been a part of huge apps with multiple frameworks inside them, or work inside CMS / website builders / ecomm platforms...

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A "simple" AI feature disrupts your life for monthsIf you have a singular React codebase and can't possibly imagine building an interface without JSX, nothing to see here!

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You already have a lot of great options that are really cool too.

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Check out Assistant UI / CopilotKit / AI Elements which are all MIT----Some specifics:Persona has a ~15 kB brotli to first paint (the...

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