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What is Agent Builder?

Agent Builder is the Thesys platform for creating and publishing AI agents. You configure your agent — model, system prompt, knowledge sources, tools, and styling — through a visual editor at console.thesys.dev, then publish it as a shareable URL. Once published, you embed the agent into your own product using either the Embed Widget npm package or a direct iframe. Your users interact with the agent without ever leaving your site.

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Key Capabilities

Embed Widget

Drop a fully featured chat widget into any website with a few lines of code. Supports tray, full-screen, and chatbar layouts.

User Identity (BYOI)

Identify your own users with a signed JWT so each person gets isolated conversation history — no Thesys login required.

Programmatic Control

Open, close, send messages, and prefill input programmatically. Trigger the agent from buttons, links, or application events.

Customization

Theme the chatbar to match your brand with CSS variable overrides, custom placeholders, and conversation starters.

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How It Works

1

Build your agent

Go to Agent Builder and create a new project. Configure the model, system prompt, knowledge sources, and tools.
2

Publish

Click Share in the editor toolbar. Your agent gets a unique URL like https://console.thesys.dev/app/your-slug.
3

Embed

Install the embed widget and add it to your site:
import { embedWidget } from 'agent-embed-widget';
import 'agent-embed-widget/dist/agent-embed-widget.css';

embedWidget({
  url: 'https://console.thesys.dev/app/your-slug',
});

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Next Steps