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There are 2 ways to customize the agent UI colors: Using color theme Customizing the color values of each color token used in the agent UI

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Using color theme

You can apply a harmonious color theme to the agent UI by just altering 3 parameters: brightness, seedColor, and dynamicSchemeVariant. It allows you to quickly set a color theme for the agent UI without having to customize each color token individually, and match your brand colors.

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Set the theme parameters

In order to apply a color theme to the agent UI, you need to pass a theme parameter to the mindset.init() method: 

const lightTheme = {
    brightness: 'light',
    seedColor: '#8E004E',
    dynamicSchemeVariant:'fidelity'
    }

mindset.init({
    fetchAuthentication: getAuthToken, 
    appUid: "YOUR-APP-UID",
    theme: lightTheme
    })

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Adjust your theme palette

With only 3 key parameters, you can generate harmonious color palettes. The theme object looks like this: 

const Theme = {
    brightness: 'light',
    seedColor: '#8E004E',
    dynamicSchemeVariant:'fidelity'
    }
1

brightness

The brightness parameter can be either "light" or "dark". It is used to set the overall brightness of the theme.
2

seedColor

The seedColor parameter is the main color of the theme, and it is used to generate the other colors of the palette.
3

dynamicSchemeVariant

The dynamicSchemeVariant parameter is used to influence the color generation algorithm, see the Play with the dynamicSchemeVariant option section below for more details.

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Examples of theme palette using only seedColor

#C42A73 - Light Theme

#C42A73 - Dark Theme

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Play with the dynamicSchemeVariant option

The core purpose of dynamicSchemeVariant is to allow you to select a specific aesthetic interpretation or “flavor” of the automatically generated color scheme. The dynamicSchemeVariant can take one of the following values:
ValueDescription
tonalSpotDefault for Material theme colors. Builds pastel palettes with a low chroma.
fidelityThe resulting color palettes match seed color, even if the seed color is very bright (high chroma).
monochromeAll colors are grayscale, no chroma.
neutralClose to grayscale, a hint of chroma.
expressivePastel colors, medium chroma palettes. The primary palette’s hue is different from the seed color, for variety.
contentAlmost identical to fidelity. Tokens and palettes match the seed color. ColorScheme.primaryContainer is the seed color, adjusted to ensure contrast with surfaces. The tertiary palette is analogue of the seed color.
rainbowA playful theme where the seed color’s hue does not appear in the theme’s generated colors. It aims for a broader spectrum of hues.
fruitSaladAnother playful theme, similar to rainbow, where the seed color’s hue also typically does not appear in the generated theme.

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Customizing the color values of each color token used in the agent UI

To achieve the best and most predictable results, you can precisely configure the color of each token in your palette. (See the All available color tokens section ). You can also choose to specify only key colors such as primary, secondary and surface and the rest of the colour palette will be generated using the dynamicSchemeVariant and the generation algorithm. 
const Theme = {
    brightness: 'light',
    seedColor: '#8E004E',
    primary: "#8F4C38",
    secondary: "#77574E",
    surface: "#FFFFFF",
    dynamicSchemeVariant:'fidelity'
    }

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The surface token

When generating the color palette, the agent background color will be set with a tint. Many web pages use the white color as the background, in which case you can set the surface token to white to ensure the agent UI blends seamlessly with the page background. You can of course set the surface token to any color you want. 
const Theme = {
    brightness: 'light',
    seedColor: '#8E004E',
    surface: "#FFFFFF",
    dynamicSchemeVariant:'fidelity'
    }

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All available color tokens

When configuring individually all tokens, the final theme object which is passed to the mindset.init() method looks like this:
To understand where each token is used in the agent system : Detailed breakdown of the color tokens
const Theme = {
    brightness: "light",
    primary: "#8F4C38",
    surfaceTint: "#8F4C38",
    onPrimary: "#FFFFFF",
    primaryContainer: "#FFDBD1",
    onPrimaryContainer: "#723523",
    secondary: "#77574E",
    onSecondary: "#FFFFFF",
    secondaryContainer: "#FFDBD1",
    onSecondaryContainer: "#5D4037",
    tertiary: "#6C5D2F",
    onTertiary: "#FFFFFF",
    tertiaryContainer: "#F5E1A7",
    onTertiaryContainer: "#534619",
    error: "#BA1A1A",
    onError: "#FFFFFF",
    errorContainer: "#FFDAD6",
    onErrorContainer: "#93000A",
    background: "#FFF8F6",
    onBackground: "#231917",
    surface: "#FFF8F6",
    onSurface: "#231917",
    surfaceVariant: "#F5DED8",
    onSurfaceVariant: "#53433F",
    outline: "#85736E",
    outlineVariant: "#D8C2BC",
    shadow: "#000000",
    scrim: "#000000",
    inverseSurface: "#392E2B",
    inverseOnSurface: "#FFEDE8",
    inversePrimary: "#FFB5A0",
    primaryFixed: "#FFDBD1",
    onPrimaryFixed: "#3A0B01",
    primaryFixedDim: "#FFB5A0",
    onPrimaryFixedVariant: "#723523",
    secondaryFixed: "#FFDBD1",
    onSecondaryFixed: "#2C150F",
    secondaryFixedDim: "#E7BDB2",
    onSecondaryFixedVariant: "#5D4037",
    tertiaryFixed: "#F5E1A7",
    onTertiaryFixed: "#231B00",
    tertiaryFixedDim: "#D8C58D",
    onTertiaryFixedVariant: "#534619",
    surfaceDim: "#E8D6D2",
    surfaceBright: "#FFF8F6",
    surfaceContainerLowest: "#FFFFFF",
    surfaceContainerLow: "#FFF1ED",
    surfaceContainer: "#FCEAE5",
    surfaceContainerHigh: "#F7E4E0",
    surfaceContainerHighest: "#F1DFDA"
}
There are available visual tools that can help you to generate a harmonious palette of colour values for each token.

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Tools you can use to generate a color palette

To ensure your agent’s UI effectively matches your brand, we recommend using Google’s Material 3 theme builder to generate a usable color palette. This web-based tool is easily accessible to developers and designers, and provides a robust starting point. For those working in Figma, the Material Theme Builder plugin for Figma offers the added flexibility to make further manual adjustments to each color in the generated palette. This allows for fine-tuning to perfectly align with your brand’s aesthetic. By leveraging these tools, you can create a consistent and brand-aligned visual experience across your agent’s user interface, enabling your customers to easily recognize and connect with your brand.

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Google’s Material 3 theme builder

1

Visit the Material Theme Builder website

2

Choose the core colors

Choose the core colors of your theme.
3

Export the theme

Export the theme as the Material Theme (JSON) format
4

Open the material-theme.json file

Copy the light and dark theme objects from the material-theme.json file.
5

Convert from JSON to Javascript

You can use any LLM to convert the JSON object to a Javascript object.From :
    const Theme = {
        "primary": "#8F4C38",
        "surfaceTint": "#8F4C38",
        "onPrimary": "#FFFFFF",
        ....
To :
    const Theme = {
        primary: "#8F4C38",
        surfaceTint: "#8F4C38",
        onPrimary: "#FFFFFF",
        ....
6

Paste the theme object in your code

Paste the final theme object in your code, and pass it to the mindset.init() method.

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Detailed breakdown of the color tokens

Indicates whether the theme is “light” or “dark”. This influences how colors are used and perceived.
All the values below will overwrite the defaults created for light and dark if they are hard set - for example, surface is set to black in dark mode and white in light mode, but if a specific surface color is used then this will be used regardless of what dark and light determine.
Specifies the algorithm used to generate the color scheme from the seedColor.Check the Play with the dynamicSchemeVariant option section above for more details.
The seedColor parameter is the main color of the theme, and it is used to generate the other colors of the palette.
The main color used throughout the UI, often for key interactive elements.This is used for the main agent text bubble, and other primary buttons like the thread list and capability chooser.
The background color of most of the app’s UI.
A color overlay applied to surfaces to indicate elevation.
The color used for text and icons displayed on top of the primary color.
A slightly lighter or darker variant of the primary color used for container backgrounds.
The color used for text and icons displayed on top of the primaryContainer color.
A color used to provide visual balance and distinguish elements from the primary ones.
The color used for text and icons displayed on top of the secondary color.
A variant of the secondary color used for container backgrounds.
The color used for text and icons displayed on top of the secondaryContainer color.
An optional color used to provide more visual variety and accent elements.
The color used for text and icons displayed on top of the tertiary color.
A variant of the tertiary color used for container backgrounds.
The color used for text and icons displayed on top of the tertiaryContainer color.
The color used for error messages and warnings.
The color used for text and icons displayed on top of the error color.
A variant of the error color used for error message containers.
The color used for text and icons displayed on top of the errorContainer color.
The color used for text and icons displayed on top of the surface color.
A slightly different variant of the surface color.
The highest elevation surface container color.
A variant of the outline color.
The color used for shadows.
The color used for scrims (semi-transparent overlays).
An alternate surface color, often used in specific UI sections.
The color used for text and icons displayed on top of the inverseSurface color.
An alternate primary color, typically used with the inverseSurface.
Fixed color roles used in components like navigation bars or tabs that maintain their color even when scrolling.
Various surface container colors with different elevation and brightness levels.