---
title: Generative UI Example (Tool UI)
description: Live demo of toolkit Tool UI patterns — charts, date pickers, contact forms, and maps. For the GenerativeUI JSON-spec primitive, see /gui-chat and /primitive in the same example app.
---

## Overview

The main route (`examples/with-generative-ui`) demonstrates **Tool UI**
patterns using toolkit `render` entries — not the
`MessagePrimitive.GenerativeUI` JSON-spec primitive.

- **Chart Generation** — AI returns structured data, rendered as bar/line/pie charts via Recharts
- **Date Picker** — AI requests a date selection, user picks via native input, result sent back with `addResult`
- **Contact Form** — AI collects name, email, and phone through an interactive form tool
- **Location Map** — AI shows a place on an embedded OpenStreetMap

### Related routes in the same example app

| Route | What it demonstrates |
|-------|---------------------|
| `/` | Tool UI (`Tools({ toolkit })`) — interactive widgets |
| `/primitive` | Static `GenerativeUIRender` with a hand-written spec |
| `/gui-chat` | End-to-end chat with `render_gui` tool → `MessagePrimitive.GenerativeUI` bridge |

See the [Generative UI primitive guide](/docs/guides/generative-ui) for opt-in wiring and pattern comparison.

## Patterns Demonstrated

### Backend-Rendered Tools (Chart, Location)

These tools have backend `execute` functions and frontend toolkit renderers. The AI generates the data, the backend confirms, and the frontend renders rich UI from `args`:

```tsx
const toolkit = defineToolkit({
  generate_chart: {
    type: "backend",
    render: ({ args, status }) => {
    const { title, type, data, xKey, dataKeys } = args;
    // Render a Recharts BarChart/LineChart/PieChart based on args
    return <ChartContainer config={buildChartConfig(dataKeys)}>...</ChartContainer>;
  },
  },
});
```

### Frontend-Only Tools (Date Picker, Contact Form)

These tools have no backend `execute` — the AI triggers the tool call, and the user completes it through interactive UI. The `addResult` callback sends the user's input back to the AI:

```tsx
const toolkit = defineToolkit({
  select_date: {
    type: "human",
    render: ({ args, result, addResult }) => {
    if (result) return <div>Selected: {result.date}</div>;

    return (
      <div>
        <p>{args.prompt}</p>
        <input type="date" onChange={(e) => setValue(e.target.value)} />
        <button onClick={() => addResult({ date: value })}>Confirm</button>
      </div>
    );
  },
  },
});
```

## Key Concepts

| Concept | Used In | Description |
|---------|---------|-------------|
| `Tools({ toolkit })` | All 4 tools | Register a React renderer for a specific tool call |
| `addResult` | Date Picker, Contact Form | Send user input back to the AI as the tool result |
| `status.type` | Chart, Location | Show loading states while the AI streams tool arguments |
| `args` streaming | Chart | Render partial UI as tool arguments stream in |

## Source

<SourceLink href="https://github.com/assistant-ui/assistant-ui/tree/main/examples/with-generative-ui" />