aiui-dev

AIUI Agent Developer Guide

This guide provides independent and comprehensive context for AI agents developing AIUI applications. It includes project structure, SFC .ink support specifications, and standard API references, designed to help Large Language Models (LLMs) generate accurate AIUI pages and logic code.

At present, AIUI is used in two forms. These two forms describe the current AIUI product shape only; more forms may be added in the future. Different forms can also transition into one another as the user flow changes, for example from a conversation-flow card into a full-screen page.

• Conversation-flow cards: Cards embedded in a conversation flow are display-only and should be treated as non-interactive surfaces for presenting information.
• Full-screen pages: Full-screen pages provide complete interaction capabilities and support richer page logic, event handling, and user input.

1. Project Structure

A standard AIUI application project typically contains the following core files:

• AGENTS.md: The agent manifest, defining the agent's identity and capabilities.
• app.json: Global configuration, including page routes, window settings, etc.
• app.js: Application lifecycle and global logic.
• pages/: Page directory containing the application's pages, primarily using the Single File Component (SFC) .ink format.
• assets/: Directory for storing static resources like images and audio.

1.1 Agent Manifest (AGENTS.md)

The manifest file defines the agent's basic information and required permissions/skills:

# Agent Manifest

## Identity
- **Name**: My AIUI Agent
- **Version**: 1.0.0
- **Description**: A brief application description.
- **Author**: Developer Name

## Capabilities
- **Permissions**:
  - camera
  - microphone
  - network
  - audio
- **Skills**:
  - weather-lookup

1.2 Global Configuration (app.json)

Defines application page paths and global UI styles. The pages field is required and declares the routing order for all application pages:

{
  "pages": [
    "pages/index/index"
  ],
  "window": {
    "navigationBarTitleText": "My AIUI Agent",
    "viewport": {
      "width": "device-width"
    }
  }
}

• pages is an array of page route strings without file extensions.
• Each entry maps to a page directory such as pages/index/index, which resolves to the corresponding page files in that folder.
• The first item in the array is treated as the application's default landing page.
• Add new pages here whenever you create additional screens, otherwise the framework will not register them for navigation.

1.3 Application Registration (app.js)

AIUI uses an ES module-based registration system, registering the application by exporting a default configuration object:

export default {
  onLaunch() {
    console.log('App Launch');
  },
  globalData: {
    userInfo: null
  }
};

1.4 Page

In AIUI, each page acts as a Model Context Protocol (MCP) UI component. A complete page should define the following parts:

• Configuration: Page-level metadata such as description, and schema. The description explains what the page represents, and schema.data uses JSON Schema to declare the input data required to render the page.
• Logic: Page state, lifecycle hooks, and custom methods used to initialize data and respond to user interactions.
• Structure: The UI template that describes the page layout and binds data to components.
• Style: The WXSS or CSS rules that control the visual presentation of the page.

When writing page configuration, pay special attention to description and schema.data:

• description should describe the page in natural language from a UI perspective.
  • State what the page displays or helps the user accomplish.
  • Mention the most important dynamic data if the page depends on external input.
  • Keep it specific and observable. Prefer "Displays a weather summary for a city" over "Weather page".
• schema.data should define the complete input contract required to render the page.
  • Use type: "object" at the top level.
  • Put all render-time fields in properties.
  • Use required for fields that must exist before the page can render correctly.
  • Add description, enum, items, and nested object definitions when they help clarify the data contract.

Examples:

Example 1: Weather card page

{
  "description": "Displays the current weather summary for a city, including temperature, condition, and humidity.",
  "schema": {
    "data": {
      "type": "object",
      "properties": {
        "city": {
          "type": "string",
          "description": "City name shown in the page header"
        },
        "temperature": {
          "type": "number",
          "description": "Current temperature in Celsius"
        },
        "condition": {
          "type": "string",
          "enum": ["sunny", "cloudy", "rainy", "snowy"],
          "description": "Current weather condition"
        },
        "humidity": {
          "type": "number",
          "description": "Current humidity percentage"
        }
      },
      "required": ["city", "temperature", "condition"]
    }
  }
}

Example 2: Product detail page

{
  "description": "Shows product information for an item, including title, price, primary image, and purchase status.",
  "schema": {
    "data": {
      "type": "object",
      "properties": {
        "title": {
          "type": "string",
          "description": "Product title"
        },
        "price": {
          "type": "number",
          "description": "Current selling price"
        },
        "imageUrl": {
          "type": "string",
          "description": "Primary product image URL"
        },
        "inStock": {
          "type": "boolean",
          "description": "Whether the product can be purchased"
        },
        "tags": {
          "type": "array",
          "description": "Short product labels shown near the title",
          "items": {
            "type": "string"
          }
        }
      },
      "required": ["title", "price", "imageUrl", "inStock"]
    }
  }
}

Example 3: Task list page

{
  "description": "Renders a task list with completion status, assignee information, and an optional empty-state message.",
  "schema": {
    "data": {
      "type": "object",
      "properties": {
        "tasks": {
          "type": "array",
          "description": "Tasks displayed in the list",
          "items": {
            "type": "object",
            "properties": {
              "id": {
                "type": "string",
                "description": "Task identifier"
              },
              "title": {
                "type": "string",
                "description": "Task title"
              },
              "completed": {
                "type": "boolean",
                "description": "Whether the task has been completed"
              },
              "assignee": {
                "type": "string",
                "description": "Person responsible for the task"
              }
            },
            "required": ["id", "title", "completed"]
          }
        },
        "emptyMessage": {
          "type": "string",
          "description": "Message shown when there are no tasks"
        }
      },
      "required": ["tasks"]
    }
  }
}

AIUI supports two page authoring modes:

1. Multi-file mode: Split the page across separate files such as page.json, page.js, page.wxml, and page.wxss.
   • page.json: Page configuration and metadata.
   • page.js: Page logic, data, lifecycle hooks, and methods.
   • page.wxml: Page template structure.
   • page.wxss: Page styles.
2. Single-file mode: Define the entire page in one .ink file.
   • <script def>: Page configuration and metadata.
   • <script setup>: Page logic, data, lifecycle hooks, and methods.
   • <page>: Page template structure.
   • <style>: Page styles.

Choose exactly one mode for each page. Do not mix multi-file page definitions with an .ink file for the same route.

2. Single File Component (SFC) .ink Specification

In AIUI, page development is recommended to use the Single File Component (SFC) format, which is the .ink file. This format centralizes the page's configuration, logic, structure, and style in a single file.

A standard .ink file structure contains four main tag blocks:

1. <script def>: Used to define page-level JSON configuration, such as the navigation bar title.
2. <script setup>: Contains the page's JavaScript logic code, exporting the page configuration object (including data, lifecycle hooks, custom methods, etc.) via export default.
3. <page>: The page's template structure (WXML-like syntax).
4. <style>: The page's stylesheet (CSS).

2.1 .ink Example Code:

<script def>
{
  "navigationBarTitleText": "Home"
}
</script>

<script setup>
import wx from 'wx';

export default {
  data: {
    greeting: 'Hello AIUI!'
  },
  onLoad() {
    console.log('Page loaded');
  },
  handleTap() {
    this.setData({
      greeting: 'Hello, World!'
    });
  }
}
</script>

<page>
  <view class="container">
    <text class="title">{{ greeting }}</text>
    <button bindtap="handleTap">Click Me</button>
  </view>
</page>

<style>
.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
}

.title {
  font-size: 24px;
  margin-bottom: 20px;
}
</style>

3. WXML (WeiXin Markup Language) & Components

In AIUI, the structure of a page is described using WXML (WeiXin Markup Language), which is used within the <page> tag of an .ink file (or a standalone .wxml file). It allows you to build user interfaces using components, data binding, and conditional rendering.

3.1 Basic Syntax and Data Binding

WXML uses double curly braces {{ }} for data binding. You can bind properties from your page's data object directly to the UI.

<!-- Text binding -->
<view>{{ message }}</view>

<!-- Attribute binding -->
<view class="{{ dynamicClass }}"></view>

<!-- Expression binding -->
<view>{{ count + 1 }}</view>

3.2 Directives (Conditional Rendering and Lists)

AIUI supports conditional rendering using the ink:if, ink:elif, and ink:else directives to control whether a component is rendered based on a condition.

<view ink:if="{{condition === 1}}"> Rendered if condition is 1 </view>
<view ink:elif="{{condition === 2}}"> Rendered if condition is 2 </view>
<view ink:else> Rendered otherwise </view>

AIUI supports basic list rendering with ink:for, allowing you to repeat a component structure for each item in an array.

<view ink:for="{{cities}}" ink:key="name">
  <text>{{item.name}}</text>
  <text>{{item.temperature}}</text>
</view>

Use item to access the current element and index to access its position in the array. Prefer providing a stable ink:key when rendering dynamic collections.

3.3 Built-in Components

AIUI provides a set of built-in components that you can use within your WXML templates. These components are mapped to native implementations for optimal performance.

For parameter-by-parameter documentation, event behavior, content model notes, and examples, see components.md. The reference there is intentionally aligned with the current component registry and implementation details in ink-builtin-components.

For runtime API details, constructor behavior, supported overloads, and current implementation limits, see apis.md. Use the linked domain reference files there when you need Canvas, wx, device, media, or AI-specific details.

• <view>: The fundamental layout container, similar to <div> in HTML.
• <text>: Displays text content. Similar to <span> in HTML.
• <image>: Displays local or remote images.
• <button>: A standard clickable button component.
• <canvas>: A component for custom 2D drawing.
• <scroll-view>: A scrollable container for content that exceeds the visible area.
• <chart>: A chart component supporting Line, Area, Pie, and Radar charts.
• <lottie-view>: Renders Lottie animations from inline JSON, local files, or remote URLs.
• <error-state>: A compact status component that displays an optional icon with a message.

4. Events

Besides lifecycle callbacks, AIUI pages also support page-level event handlers for device input such as hardware keys and voice wakeup. These handlers are defined directly on the exported page object.

4.1 Page-Level Events

Page-level events are page methods, not WXML binding attributes. Use them when the page itself should react to framework-delivered input events.

export default {
  onKeyDown(event) {
    console.log('key down:', event.code);
  },

  onKeyUp(event) {
    console.log('key up:', event.code);
  },

  onVoiceWakeup(event) {
    console.log('voice wakeup:', event.keyword);
  }
}

Supported page-level event callbacks:

Callback	Description	Trigger
onKeyDown(event)	Handles page-level key press events	Triggered when a key is pressed
onKeyUp(event)	Handles page-level key release events	Triggered when a key is released
onVoiceWakeup(event)	Handles page-level voice wakeup events	Triggered when a wake word is detected

Some page-level events notify the page and then continue the host's built-in default behavior, such as navigating back, scrolling, or activating the focused target. For key events, those default actions are attached to the onKeyUp(event) phase, so interception only takes effect when the page prevents the keyup event.

export default {
  data: {
    status: 'idle'
  },

  onKeyUp(event) {
    if (event.code === 'Backspace') {
      event.preventDefault();
      this.setData({
        status: 'back action intercepted'
      });
    }
  }
}

Use these rules when handling page-level events:

• If event.preventDefault() is not called, the host may continue the event's default behavior after the callback finishes.
• event.preventDefault() may be called from different handlers, but for key events the host default behavior is defined on onKeyUp(event).
• For that reason, preventing a key event only takes effect when event.preventDefault() is applied to onKeyUp(event).
• Interception only matters for events that actually have host-level default behavior.

4.2 Default Behaviors

Some events in AIUI are not purely notifications. After the page-level callback runs, the host may still perform a built-in action unless the page explicitly intercepts it.

Common default behaviors include:

• Navigating back when the user presses Backspace
• Scrolling the current root container when the user presses ArrowUp or ArrowDown
• Activating the currently focused target or entering navigation mode when the user presses Enter
• Triggering host-defined behavior for device-specific keys when supported by the current runtime

For key events, use event.preventDefault() on onKeyUp(event) when the page needs to replace the host action with custom logic. This is appropriate when:

• The page manages its own back stack, dialog dismissal, or overlay closing behavior
• The page uses hardware keys for custom focus movement or shortcut handling
• The page wants to block host navigation until validation or confirmation is complete

Do not call event.preventDefault() unless the page will provide a clear replacement behavior. If you intercept a default action without updating UI state or performing an alternative action, the page may appear unresponsive.

export default {
  data: {
    dialogVisible: true,
    status: 'idle'
  },

  onKeyUp(event) {
    if (event.code === 'Backspace' && this.data.dialogVisible) {
      event.preventDefault();
      this.setData({
        dialogVisible: false,
        status: 'dialog closed instead of navigating back'
      });
    }
  }
}

4.3 Key Events

onKeyDown(event) is useful for immediate feedback when a hardware key is pressed, such as moving focus or reacting to directional input.

onKeyDown(event) is useful for transient feedback, but preventing it does not stop the host's key default behavior because those actions are processed on key release.

onKeyUp(event) is useful when the page needs to react after a key is released. It is also the effective interception point for key default behavior, because the host evaluates actions such as back, scroll, and activation on key release. In AIUI hosts such as Rokid Glasses, event.code commonly includes:

• Backspace: usually navigates back or requests app close unless intercepted
• ArrowUp: usually scrolls the root view upward unless intercepted
• ArrowDown: usually scrolls the root view downward unless intercepted
• Enter: usually enters navigation mode or activates the current target unless intercepted
• GlobalHook: a device-specific Rokid Glasses key code for hardware-side touch or shortcut input

Note: Use GlobalHook only when you need the fastest possible key response, such as game-style interactions. Its tradeoff is that it is invoked before other key handlers. If you need more consistent key behavior and can tolerate a little latency, it is not recommended.

export default {
  data: {
    status: 'idle'
  },

  onKeyDown(event) {
    if (event.code === 'Enter') {
      this.setData({
        status: 'enter pressed'
      });
    }
  },

  onKeyUp(event) {
    switch (event.code) {
      case 'Backspace':
        event.preventDefault();
        this.setData({ status: 'back action intercepted' });
        break;
      case 'ArrowDown':
        this.setData({ status: 'arrow down received' });
        break;
      case 'Enter':
        this.setData({ status: 'enter released' });
        break;
      case 'GlobalHook':
        this.setData({ status: 'temple button touched' });
        break;
      default:
        break;
    }
  }
}

4.4 Voice Wakeup Events

onVoiceWakeup(event) runs when the host reports a voice wakeup event. Read the matched wake word from event.keyword. Some hosts may also provide default handling for voice wakeup; whether interception is supported depends on the host implementation.

export default {
  data: {
    status: 'idle'
  },

  onVoiceWakeup(event) {
    if (event.keyword === 'leqi') {
      this.setData({
        status: 'voice wakeup received'
      });
    }
  }
}

Environment-aware page pattern

When a page needs higher-level motion-aware or host-delivered spatial signals, enable page-scoped world awareness first and then handle the related page callbacks:

export default {
  onLoad() {
    if (typeof this.enableWorldAwareness === 'function') {
      this.enableWorldAwareness();
    }
  },

  onHeadGesture(event) {
    console.log('gesture:', event.gesture);
  },

  onOrientationStabilityChange(event) {
    console.log('stable:', event.stable);
  },
}

• this.enableWorldAwareness() enables page-level environment awareness so the page can receive higher-level motion and host interaction signals.
• onHeadGesture(event) is called when the page receives a head gesture such as nod or shake.
• onOrientationStabilityChange(event) is called when the page receives an orientation stability change, for example when the current pose becomes stable or unstable.

5. WXSS (WeiXin Style Sheets)

WXSS is a style language used to describe the visual presentation of components. It is highly compatible with standard CSS and is used within the <style> block of an .ink file (or a standalone .wxss file).

For the current confirmed selector support, layout properties, styling properties, and explicitly unsupported authoring assumptions, see wxss.md.

5.1 Features

WXSS extends standard CSS with features tailored for mobile and wearable devices:

• @import: You can use the @import statement to import external style sheets.

@import "./common.wxss";

.box {
  width: 240px;
  height: 100px;
  background-color: #40FF5E;
}

5.2 Selectors

AIUI supports most standard CSS selectors:

• Class Selector (.class): The recommended way to style components.
• ID Selector (#id).
• Type Selector (element): e.g., view, text.
• Combinators: Grouping (A, B), Descendant (A B), Child (A > B).

Recommendation: Prioritize using Class Selectors to ensure optimal rendering performance.

5.3 Layout

AIUI supports both Flexbox and Grid layout through the Ink CSS engine.

• Flexbox is the primary and recommended choice for most one-dimensional layouts such as vertical stacks, horizontal toolbars, centered content, and card internals.
• Grid is supported for two-dimensional layouts where rows and columns need to be controlled together.

Supported Flexbox properties include:

• display: flex
• flex-direction
• flex-wrap
• justify-content
• align-items
• flex-grow
• flex-shrink
• flex-basis
• gap, row-gap, column-gap

Supported Grid properties include:

• display: grid
• grid-template-columns
• grid-template-rows
• grid-auto-columns
• grid-auto-rows
• grid-auto-flow
• grid-column, grid-column-start, grid-column-end
• grid-row, grid-row-start, grid-row-end
• grid-area
• align-content
• justify-items
• align-self
• justify-self
• gap, row-gap, column-gap

Prefer Flexbox when either layout model can work. Use Grid when the UI clearly benefits from explicit row and column placement.

.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.dashboard {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 12px;
}

5.4 Styling

AIUI supports a practical subset of CSS properties for visual styling. When generating styles, stay within the properties that are known to be supported by the Ink CSS engine.

Commonly supported styling properties include:

• Box model and sizing: width, height, min-width, min-height, max-width, max-height, margin, padding, box-sizing
• Positioning and overflow: position, inset, overflow, overflow-x, overflow-y, z-index
• Colors and backgrounds: color, background-color, custom properties, and var(--token) references
• Borders and outlines: border, border-width, border-style, border-color, border-radius, outline, outline-width, outline-style, outline-color, outline-offset
• Typography: font-size, line-height, font-weight, font-family, font-style, font-variant, text-align, white-space, word-break
• Effects and visibility: opacity, visibility, box-shadow, filter, transform, transform-origin
• Motion: transition, transition-property, transition-duration, transition-timing-function, transition-delay, animation, animation-name, animation-duration, animation-timing-function, animation-delay, animation-iteration-count, animation-direction, animation-fill-mode

Prefer simple, production-safe CSS. Do not assume browser-only features or unsupported CSS shorthands beyond what AIUI and Ink CSS explicitly support.

When styling AIUI interfaces:

• Prefer AIUI's built-in theme tokens instead of hardcoding colors, spacing, border widths, or radii
• Reference theme values with var(--token-name)
• Keep custom properties semantically named when introducing new local tokens

Built-in green theme token reference:

Token	Category	Purpose
--app-width	App layout	Defines the standard application width.
--app-height-min	App layout	Defines the minimum recommended application height.
--app-height-max	App layout	Defines the maximum recommended application height.
--color-primary	Core colors	Primary brand and action color.
--color-primary-60	Core colors	Reduced-opacity primary color for secondary emphasis.
--color-primary-40	Core colors	Lower-opacity primary color for highlights and subtle fills.
--color-secondary	Core colors	Secondary accent color derived from the primary palette.
--color-background	Core colors	Default page or app background color.
--color-surface	Core colors	Surface color for cards and panels.
--color-surface-highlight	Core colors	Highlighted surface fill for selected or emphasized areas.
--color-text-primary	Core colors	Default high-priority text color.
--color-text-secondary	Core colors	Lower-emphasis text color for supporting copy.
--border-width-thin	Borders and radii	Thin border width for subtle separators and outlines.
--border-width-default	Borders and radii	Standard border width for common components.
--border-width-strong	Borders and radii	Heavy border width for strong emphasis.
--border-color-default	Borders and radii	Default border color for most components.
--border-color-muted	Borders and radii	Softer border color for low-emphasis dividers.
--border-color-strong	Borders and radii	Strong border color for emphasized boundaries.
--border-color-accent	Borders and radii	Accent border color for interactive or highlighted states.
--border-color-success	Borders and radii	Border color for success states.
--border-color-danger	Borders and radii	Border color for error or destructive states.
--border-color-warning	Borders and radii	Border color for warning states.
--border-color-highlight	Borders and radii	Border color for featured or highlighted elements.
--border-color-contrast	Borders and radii	High-contrast border color for strong separation.
--border-color-fallback	Borders and radii	Fallback border color when a semantic border token is unavailable.
--card-border-width	Borders and radii	Default border width for card components.
--card-border-color	Borders and radii	Default border color for card components.
--radius-sm	Borders and radii	Small corner radius.
--radius-md	Borders and radii	Medium corner radius used by standard components.
--spacing-sm	Spacing	Small spacing unit.
--spacing-md	Spacing	Medium spacing unit used for default padding and gaps.
--spacing-lg	Spacing	Large spacing unit for more open layouts.
--card-padding	Card tokens	Default inner padding for cards.
--card-title-font-size	Card tokens	Font size for card titles.
--card-title-gap	Card tokens	Gap between card title content and adjacent elements.
--card-footer-font-size	Card tokens	Font size for card footer content.
--card-footer-padding-y	Card tokens	Vertical padding for card footers.
--card-footer-margin-top	Card tokens	Top margin separating the footer from body content.
--card-divider-width	Card tokens	Divider thickness inside cards.
--card-divider-color	Card tokens	Divider color inside cards.
--card-cover-height	Card tokens	Standard media or cover area height for cards.
--card-cover-background	Card tokens	Background color for card cover regions.
--error-state-icon-size	Error state tokens	Icon size for error-state components.
--error-state-icon-gap	Error state tokens	Gap between error icon and text.
--error-state-font-size	Error state tokens	Font size for error-state text.
--error-state-text-color	Error state tokens	Text color for error-state content.
--error-state-background	Error state tokens	Background fill for error-state containers.
--error-state-border-width	Error state tokens	Border width for error-state containers.
--error-state-border-color	Error state tokens	Border color for error-state containers.
--input-background-color	Input tokens	Background color for input fields.
--input-border-width	Input tokens	Border width for input fields.
--input-border-color	Input tokens	Border color for input fields.
--input-placeholder-color	Input tokens	Text color for placeholder content.
--input-padding-y	Input tokens	Vertical padding inside inputs.
--input-padding-x	Input tokens	Horizontal padding inside inputs.
--input-radius	Input tokens	Corner radius for inputs.
--calendar-padding	Calendar tokens	Outer padding for calendar components.
--calendar-background	Calendar tokens	Background color for calendars.
--calendar-border-width	Calendar tokens	Border width for calendar containers.
--calendar-border-color	Calendar tokens	Border color for calendar containers.
--calendar-radius	Calendar tokens	Corner radius for calendar containers.
--calendar-title-gap	Calendar tokens	Gap around the calendar title area.
--calendar-title-font-size	Calendar tokens	Font size for calendar titles.
--calendar-title-color	Calendar tokens	Text color for calendar titles.
--calendar-weekday-gap	Calendar tokens	Gap between weekday labels.
--calendar-weekday-font-size	Calendar tokens	Font size for weekday labels.
--calendar-weekday-color	Calendar tokens	Text color for weekday labels.
--calendar-cell-min-height	Calendar tokens	Minimum height for day cells.
--calendar-cell-radius	Calendar tokens	Corner radius for calendar day cells.
--calendar-selected-indicator-size	Calendar tokens	Size of the selected-day indicator.
--calendar-day-font-size	Calendar tokens	Font size for day numbers.
--calendar-day-color	Calendar tokens	Text color for day numbers.
--calendar-annotation-font-size	Calendar tokens	Font size for day annotations or notes.
--calendar-holiday-color	Calendar tokens	Accent color used for holidays.
--calendar-event-color	Calendar tokens	Accent color used for events.
--calendar-marker-size	Calendar tokens	Size of event or holiday markers.
--calendar-holiday-marker-color	Calendar tokens	Marker color for holidays.
--calendar-event-marker-color	Calendar tokens	Marker color for events.
--calendar-outside-month-color	Calendar tokens	Text color for days outside the current month.
--calendar-selected-bg	Calendar tokens	Background color for the selected day.
--calendar-selected-color	Calendar tokens	Text color for the selected day.
--calendar-today-border-color	Calendar tokens	Border color used to indicate today.
--calendar-today-text-color	Calendar tokens	Text color used to indicate today.
--chart-color	Chart tokens	Primary chart color.
--chart-positive-color	Chart tokens	Color for positive chart values or trends.
--chart-negative-color	Chart tokens	Color for negative chart values or trends.
--chart-reference-color	Chart tokens	Color for reference lines or benchmarks.
--chart-stroke-color	Chart tokens	Default stroke color for chart lines and frames.
--chart-stroke-width	Chart tokens	Default stroke width for chart lines and frames.
--chart-radar-fill-color	Chart tokens	Fill color for radar chart areas.
--chart-fill-style	Chart tokens	Fill style mode used by chart rendering.
--chart-panel-background	Chart tokens	Background color for chart panels.
--chart-frame-background	Chart tokens	Background color for chart frames or plot areas.
--theme-color	Compatibility tokens	Compatibility token mapping to the main theme color.
--theme-bg	Compatibility tokens	Compatibility token mapping to the theme background.
--theme-border	Compatibility tokens	Compatibility token for a default themed border shorthand.
--theme-radius	Compatibility tokens	Compatibility token mapping to the default radius.
--theme-padding	Compatibility tokens	Compatibility token mapping to the default padding.

5.5 Fonts

AIUI applications can use both system fonts provided by the host platform and bundled custom fonts declared in app.json.

System fonts

For common cases, reference a system font directly in font-family or in a canvas 2D font string:

<text style="font-family: Arial, sans-serif; font-size: 18px;">
  System font example
</text>

const ctx = wx.createCanvasContext('myCanvas');
ctx.font = '18px Arial';
ctx.fillText('Canvas system font example', 12, 40);

Recommendations:

• Prefer a fallback chain such as Arial, sans-serif instead of a single family.
• Do not assume every platform ships the same system fonts.
• Test the final visual result on the actual target host.

Bundled custom fonts

If the UI requires a specific typeface, declare it in app.json under fonts. The runtime bundles the font files with the app and lets both text rendering and canvas rendering reuse the same family name.

{
  "pages": [
    "pages/index/index"
  ],
  "fonts": [
    {
      "family": "Bundled Serif",
      "src": "assets/fonts/NotoSerif-Regular.ttf",
      "weight": 400,
      "style": "normal"
    },
    {
      "family": "Bundled Serif",
      "src": "assets/fonts/NotoSerif-BoldItalic.ttf",
      "weight": 700,
      "style": "italic"
    }
  ]
}

After declaration, reference the family name exactly as declared:

<text style="font-family: 'Bundled Serif', serif; font-size: 20px;">
  Bundled font example
</text>

const ctx = wx.createCanvasContext('myCanvas');
ctx.font = 'italic 700 24px "Bundled Serif"';
ctx.fillText('Canvas uses bundled fonts', 12, 40);

ctx.font = '24px "Bundled Serif"';
ctx.fillText('Missing glyphs still fall back to system fonts', 12, 80);

Bundled font notes:

• font-family and canvas font share the same bundled family name.
• When multiple weights or styles are declared for one family, the nearest matching face is selected automatically.
• If a bundled resource is missing or cannot be parsed, the app falls back to system fonts.
• Store bundled font files under app-owned assets such as assets/fonts/ so they can be packaged with the app.
• Prefer a generic fallback family such as serif or sans-serif after the bundled family name.

When generating AIUI code:

• Use app.json fonts only when the UI explicitly needs a non-system typeface.
• Keep family names consistent between app.json, WXSS, inline style, and canvas font strings.
• Do not assume web font loading patterns such as remote @font-face URLs.

6. Design Guidelines

The full visual design language for single-green monochrome display devices (RokidGlasses1 / RokidGlasses2) — color tokens, typography, spacing, radii, border widths, component chrome, and Do's & Don'ts — lives in design-system-green.md. This system currently applies only to single-green monochrome hardware; a separate full-color variant does not exist yet. Treat the spec as the source of truth whenever you choose colors, spacing, or component styling on monochrome-green targets; the cheat-sheet below only summarizes the rules that come up most often during code generation.

When developing AIUI applications, especially for wearable devices, it is crucial to follow these design guidelines to ensure a consistent and user-friendly experience.

6.1 Dimensions and Layout

• Width: The application width is strictly 480px.
• Height: The recommended application height is between 120px and 352px. The full screen reference size is 480x352. Avoid creating overly tall pages that require excessive scrolling.
• Card Style: It is highly recommended to use a Card Style layout for each page. This provides a clear boundary and better visual focus in the spatial environment.
• Default Background: Use black as the default background color.
• Default Border: Use a 2px border as the default border width for cards and key interactive elements.
• Border Radius: The recommended border radius (e.g., for cards, buttons, and images) is 12px.

6.2 Color Palette

• Theme First: Prefer AIUI's built-in theme tokens as the public styling interface.
• Token Usage: Use var(--color-primary), var(--color-text-primary), var(--color-background), var(--spacing-md), var(--radius-md), and related semantic tokens before introducing hardcoded values.
• Green Theme Reference: If you intentionally target the green wearable visual language, prefer the built-in green theme tokens instead of hardcoding #40FF5E, rgba(64, 255, 94, 0.6), or rgba(64, 255, 94, 0.4) directly.
• Default Text Color: Prefer semantic text tokens such as var(--color-text-primary) or var(--color-text-secondary) unless a specific component token is more appropriate.

6.3 Prohibitions

• DO NOT use emoji in generated UI copy, labels, status text, or decorative content by default. Emoji may only be used when the developer explicitly requests them or the product requirements clearly require them.
• DO NOT use large areas of solid color blocks. This can be visually overwhelming and uncomfortable on wearable displays. Keep backgrounds subtle and use colors primarily for accents, text, and interactive elements.

7. AIUI API Reference

The detailed runtime API index lives in apis.md. It links to domain-specific reference files for Canvas, wx, device, media, AI, and browser-style networking / encoding APIs.

When generating code:

• Treat apis.md and its linked domain reference files as the source of truth for currently supported API shapes and behaviors.
• Follow the implementation-aligned definitions there instead of assuming standard Web API compatibility.
• Do not infer unlisted overloads, return shapes, or browser semantics.

8. Usage Examples (WeChat APIs)

Take a Photo with Camera

import wx from 'wx';

const camera = wx.media.createCameraContext();
const photo = await camera.takePhoto({ quality: 'high' });
console.log('Image data size:', photo.data.byteLength);

Crypto & UUID Generation

const uuid = crypto.randomUUID();
const hash = await crypto.subtle.digest('SHA-256', new TextEncoder().encode('hello AIUI'));