Persona
An open-source Agent UI library in VanillaJS for building agentic front-end experiences with WebMCP, SSE streaming, and customizable theming.
Persona
What is Persona?
Persona vs Similar AI Tools
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How to use Persona?
- 1Install via npm: npm install @runtypelabs/persona
- 2Import CSS: import '@runtypelabs/persona/widget.css'
- 3Import initAgentWidget: import { initAgentWidget } from '@runtypelabs/persona'
- 4Initialize widget with a target element and config (API URL):
- 5initAgentWidget({ target: '#chat', config: { apiUrl: 'https://your-api.com/chat' } })
- 6Customize launcher type (floating, docked, fullscreen) via config option.
Persona Key Features
- WebMCP-native: agents can use tools registered on the page via document.modelContext
- Shadow DOM rendering for style isolation
- SSE streaming with pluggable parsers and customFetch
- Three-layer token theming (palette, semantic, component) with dark mode and live editor
- Floating, docked, or fullscreen UX modes
- Pluggable transport and parser adapters
Persona Use Cases
- Customer support chat widget
- AI copilot for existing web applications
- Onboarding assistant for new users
- Documentation Q&A agent
- E-commerce assistant for product search and bookings
Persona Pricing & Free Credits
Persona currently operates on a Free model.
This tool is completely free to use
Persona Pros & Cons
Pros
- Lightweight and framework-agnostic (pure VanillaJS)
- WebMCP standard enables agents to use existing page tools
- Shadow DOM isolates styles from host application
- Pluggable transport and parsers work with any SSE backend
- Comprehensive theming system for brand customization
Cons
- Documentation and examples are still growing
- Requires a backend SSE endpoint for full functionality
What is Persona best for?
- Developers building custom AI agent UIs
- Teams wanting to integrate agent chat into existing web apps
- Projects needing a lightweight, extensible chat widget
Persona FAQ
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