Persona.js

In plain words

Persona.js is a lightweight, open-source AI chat interface library that integrates into any website without requiring a specific framework. It works with modern applications and static HTML, supports streaming chat and voice features, and connects natively with WebMCP to let the AI assistant discover and use tools from the parent page. Developers can add interactive copilot experiences and customize theming without rebuilding their frontend or creating custom APIs.

written from the facts on this page · September 2026

From the sources

Persona is a lightweight, open-source AI chat UI library that embeds into any website, from modern apps to static HTML. Unlike React-based chat frameworks, Persona is framework-free, backend-agnostic, and WebMCP-native, so your assistant can discover and execute tools exposed by the parent page. Add streaming chat, voice, theming, and interactive copilot experiences without rebuilding your frontend or writing bespoke APIs.

Persona is an open-source, themeable AI chat widget you can add to any website in minutes. SSE streaming, agent loops, tool use, and style isolation: zero framework dependencies.

Persona helps you create agentic front-end experiences for the web, in pure JS. Lightweight, extensible, and WebMCP-native. Pick your jump-off point and customize from there: a launcher floating in the corner, a copilot docked beside your app, or a fullscreen assistant. You move between them by changing the launcher config, not your agent or app. A launcher in the corner that opens a floating panel. The drop-in default for support, docs, sales, or onboarding. No layout config required. import "@runtypelabs/persona/widget.css" ; import { initAgentWidget } from "@runtypelabs/persona" ; initAgentWidget ({ target : "#chat" , config : { apiUrl: "https://your-api.com/chat" , // floating launcher…from persona-chat.dev

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  Persona.js – a vanilla-JS agent UI library with native WebMCP (MIT)Jun 2026 · github.com · ▲27

  Hey everyone. My cofounder and I are open sourcing Persona.js (https://www.persona-chat.dev/). It's a VanillaJS library that helps anyone build agentic experiences on the web, without a framework dependency, and full WebMCP support So, why'd we do this? 1) We're super fans of the web and the browser can do a ton today 2) 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 with If you've been a part of huge apps with multiple frameworks inside them, or work inside CMS /…

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