wanteddev/montage-web/montage-react

montage-react

Skill that is automatically applied when developing components based on Wanted Design System (Montage) in React projects.

When to use

Apply this skill when any of the following conditions are met:

• Working in a project that uses Montage packages such as @montage-ui/core, @montage-ui/icon, @montage-ui/dummy, @montage-ui/brand
• Creating, modifying, or looking up UI components
• Implementing pages or screens
• Working on styling (sx prop, theme tokens, colors, typography)
• Finding or using icons
• Need a placeholder GNB / Footer / bottom tab bar for a demo or preview page
• Need to render the Wanted brand logo
• Implementing Figma designs as code
• Asking questions about Montage / design system

Instructions

0. Verify MCP Server Connection (Required, Highest Priority)

Before using any MCP tools, always verify the montage-mcp-server connection first.

Call mcp__montage-mcp-server__health_check to check the connection status.

• Tool not found (MCP server not connected): Inform the user and suggest running /mcp to connect montage-mcp-server.
• Authentication error: Inform the user that login is required. Running /mcp will initiate the auth flow.
• Other errors: Inform the user that the MCP server is unreachable and suggest retrying later.

If the connection check fails, do not proceed. Wait for the user's response.

1. Gather Initial Information (Parallel Calls)

Gather required information in parallel at the start. Avoid unnecessary sequential calls.

When setting up React.js or Next.js from scratch, use:

• mcp__montage-mcp-server__getting_started

Always call in parallel:

• mcp__montage-mcp-server__montage_coding_guidelines — coding guidelines
• mcp__montage-mcp-server__list_components — available component list

Add in parallel when needed:

• mcp__montage-mcp-server__list_tokens — when custom styling is required
• mcp__montage-mcp-server__get_color_usage — when color application is needed
• mcp__montage-mcp-server__list_icons — when icons are needed
• mcp__montage-mcp-server__list_dummy_components — when a placeholder GNB / Footer / bottom tab bar is needed for a demo or preview
• mcp__montage-mcp-server__list_brand_assets — when the Wanted brand logo (or other brand mark) is needed

2. Component Usage Principles

2.1 Always Look Up Specs Before Use

When using Montage components, never guess — always look up the detailed specs.

mcp__montage-mcp-server__get_component({ componentName: "ComponentName" })

Important: Looking up the parent component instead of a sub-component gives you the full composition pattern (Anatomy) and all APIs at once.

• For Modal: get_component({ componentName: "Modal" }) — includes ModalContainer, ModalNavigation, etc.
• For Card: get_component({ componentName: "Card" }) — includes CardThumbnail, CardContent, etc.
• For Tab: get_component({ componentName: "Tab" }) — includes TabList, TabListItem, TabPanel, etc.

When unsure which Typography variant to use, call get_component({ componentName: "Typography" }) to check the size table for each variant.

2.2 Prefer Montage Components

1. Check Montage before implementing: Before creating a new component, check if an identical or similar one exists in Montage
2. Extend based on Montage: Even when customization is needed, extend from Montage components
3. Props first, sx second: Use props provided by the component (size, color, variant, etc.) first; only use sx when props are insufficient

3. Page/Screen Implementation Guide

Follow these patterns for vibe design or page implementation requests.

3.1 Page Layout Structure

Basic page skeleton:

import { Box, FlexBox, containerStyle } from '@montage-ui/core';
<FlexBox flexDirection="column" sx={{ minHeight: '100vh' }}>
  <Box as="header" sx={containerStyle(true)}>
    ...
  </Box>
  <Box as="main" sx={containerStyle(true)}>
    ...
  </Box>
  <Box as="footer" sx={containerStyle(true)}>
    ...
  </Box>
</FlexBox>;

For containerStyle details, use get_utility_function("containerStyle").

3.2 Layout Component Selection Guide

3.3 Spacing Guide

When implementing a Figma design directly, ignore this guide and use the exact spacing values defined in Figma.

Otherwise (vibe design or freeform composition), do not use spacing tokens. Use px values directly instead.

• Default gap between components: gap="12px" or gap="16px"
• Gap between sections: gap="24px" ~ gap="32px"
• Page-level section gap: gap="40px" ~ gap="48px"
• Use FlexBox's gap prop or specify padding, margin in px via sx

3.4 Responsive Implementation Strategy

Three methods are available. Pick based on what's changing:

• Only component props change → responsive props (sm={{ size: "large" }})
• Custom CSS changes → respondTo / respondDown utilities
• Rendering itself changes → useMediaQuery hook

Use mobile-first sizing, then override with sm, md, lg, xl. Typically only sm breakpoint is used.

3.5 UI Implementation Notes

• TextButton, IconButton (variant background, normal), ListCell, RadioGroupItem, Checkbox, AvatarButton, ToggleIcon have interaction areas larger than their visual bounds — give slightly more spacing room.
• When using ScrollArea with border-radius, add [data-role='scroll-area-bar-wrapper'] { padding-block: ${radius}; } to avoid unnatural scrollbar.
• Don't render too much UI in a single file. Split into smaller components appropriately.

4. Styling Rules

4.1 When to Separate style.ts

• Inline (1-3 lines): Write directly in sx prop
• Separate style.ts (4+ lines): Extract to a separate file

When using a theme function in the sx prop, the theme is injected automatically. No need to pass it manually like wrapperStyle(theme).

4.2 Conditional Styles

// style.ts
export const buttonStyle = (isActive: boolean) => (theme: Theme) =>
  css`
    color: ${
      isActive
        ? theme.semantic.foreground.brand.primary
        : theme.semantic.foreground.neutral.tertiary
    };
  `;
// index.tsx
<Box sx={buttonStyle(isActive)} />;

5. Icons

When icons are needed, check the Montage icon library first via mcp__montage-mcp-server__list_icons. Always prefer Montage icons over creating new ones.

6. Utility Functions

Use utility functions provided by Montage. Look up available utilities via mcp__montage-mcp-server__list_utility_functions, and get detailed usage with mcp__montage-mcp-server__get_utility_function.

7. Design Token Usage

Use Montage design tokens instead of hardcoded values. Look up available tokens via mcp__montage-mcp-server__list_tokens.

• Never use CSS variable (`var(--semantic-...)`) directly. Always access colors through the theme callback (e.g., sx={theme => ({ color: theme.semantic.foreground.neutral.primary })}). CSS variable names are internal implementation details and may change without notice.
• Colors: use semantic color tokens instead of #RRGGBB (fall back to atomic colors if not possible). Use get_color_usage to look up which token to use for a given purpose.
• Typography: use the Typography component or typographyStyle utility. Use get_component({ componentName: "Typography" }) to look up the variant/size table.
• Shadows: use theme.semantic.elevation.shadow.normal.*
• Opacity: must use addOpacity utility + theme.opacity[N]. Theme color values are CSS variables (e.g. var(--semantic-surface-brand-primary)), so appending hex alpha strings directly will NOT work. Available opacity keys: 0, 5, 8, 12, 16, 22, 28, 35, 43, 52, 61, 74, 88, 97, 100.

```ts // use addOpacity utility import { addOpacity } from '@montage-ui/core';

import type { Theme } from '@montage-ui/core';

const wrapperStyle = (theme: Theme) => css background-color: addOpacity( theme.semantic.surface.brand.primary, theme.opacity[5] ); border: 1px solid ${addOpacity(theme.semantic.surface.brand.primary, theme.opacity[22])}; ; ```

When implementing a Figma design:

• If Figma specifies an opacity value that does not match any theme.opacity[N] key, use the raw number directly (e.g., opacity: 0.07) instead of a token.
• If the Figma design renders the opacity as a colored overlay layer (not fading the element itself), implement it via ::before / ::after pseudo-element so child content stays fully opaque. When the parent has border-radius, the pseudo-element must also set borderRadius: 'inherit', otherwise the overlay will overflow the rounded corners.

```ts // style.ts import { css } from '@montage-ui/core';

import type { Theme } from '@montage-ui/core';

export const overlayStyle = (theme: Theme) => css` position: relative; border-radius: 12px;

&::before { content: ''; position: absolute; inset: 0; border-radius: inherit; background-color: ${theme.semantic.surface.neutral.secondary}; opacity: ${theme.opacity[8]}; } ; ``

```tsx // index.tsx import { overlayStyle } from './style';

<Box sx={overlayStyle} />; ```

• Do not use spacing tokens. Use px values directly.

8. Dummy Layout Components (@montage-ui/dummy)

The @montage-ui/dummy package provides presentational-only reference scaffolds (NavBar, Footer, BottomTabBar) that mirror the wanted.co.kr layout.

• Use for: demo pages, sandboxes, storybook entries, visual previews — anywhere a realistic-looking GNB / Footer / mobile tab bar is needed without wiring real behavior.
• Do NOT use as-is in production. They take no behavior props (no onClick, no routing, no state). For real product code, copy the structure and rebuild it against your own data, links, and handlers using primitives from @montage-ui/core.
• All three are forwardRef components and accept a standard sx prop. BottomTabBar is intended for viewports below the sm breakpoint — wrap it accordingly if you also render NavBar on the same page.
• Look up the full list and usage via mcp__montage-mcp-server__list_dummy_components. To see the exact JSX (e.g. to copy and adapt), read the source from packages/dummy/src/components/<component>/index.tsx.

import { NavBar, Footer, BottomTabBar } from '@montage-ui/dummy';
<>
  <NavBar />
  <main>{/* page content */}</main>
  <Footer />
  <BottomTabBar />
</>;

9. Brand Assets

Official Wanted brand marks. Use as-is — do not recolor, restyle, redraw, or crop.

9.1 Full wordmark — LogoWanted (@montage-ui/brand)

Use when you need the "[symbol] wanted" wordmark (symbol + text together) — e.g. GNB, footer, splash, marketing surfaces.

• Props: width (default 112), height (default 32), plus standard sx and any <svg> attributes. Forwards ref to SVGSVGElement.
• Pass aria-label (e.g. "Wanted Logo") when the logo stands alone in an interactive or landmark element.
• Keep the default 112:32 (≈ 3.5:1) aspect ratio when resizing.

import { LogoWanted } from '@montage-ui/brand';
<LogoWanted aria-label="Wanted Logo" />
<LogoWanted width={168} height={48} aria-label="Wanted Logo" />;

9.2 Symbol only — IconSymbol (@montage-ui/icon)