Stitch MCP — Create Design System

Creates a new Stitch Design System — a reusable theme configuration that can be applied to any screen. This bridges the gap between local CSS token extraction (via stitch-design-system) and Stitch-native design tokens that persist across generations.

Critical prerequisite

Only use this skill when the user explicitly mentions "Stitch".

When to use

• After extracting CSS tokens via stitch-design-system and wanting to persist them in Stitch
• User wants consistent theming across multiple screens or projects
• The orchestrator's Step 7 offers to create a Stitch Design System from extracted tokens
• User explicitly asks to create a design system in Stitch

Call the MCP tool

{
  "name": "create_design_system",
  "arguments": {
    "designSystem": {
      "displayName": "SaaS Dashboard Theme",
      "theme": {
        "colorMode": "LIGHT",
        "font": "DM_SANS",
        "headlineFont": "DM_SANS",
        "bodyFont": "DM_SANS",
        "labelFont": "DM_SANS",
        "roundness": "ROUND_EIGHT",
        "saturation": 3,
        "customColor": "#6366F1",
        "backgroundLight": "#FFFFFF",
        "backgroundDark": "#18181B",
        "description": "Professional SaaS aesthetic — clean, indigo accent, airy spacing"
      },
      "designTokens": "--color-primary: #6366F1;\n--color-bg: #FFFFFF;\n--font-family: 'DM Sans';",
      "styleGuidelines": "Use indigo for interactive elements. Gray-50 backgrounds for cards. 8px border radius."
    },
    "projectId": "3780309359108792857"
  }
}

Parameter reference

designSystem — required object

Field	Type	Required	Description
displayName	string	Yes	Human-readable name for the design system
theme	DesignTheme	Yes	Visual configuration — see below
designTokens	string	No	CSS custom properties or token definitions
styleGuidelines	string	No	Natural-language design rules

theme (DesignTheme) — the visual configuration

Field	Type	Values	Description
colorMode	enum	LIGHT, DARK	Base appearance mode
font	enum	See font list below	Deprecated — sets all three font roles. Use the specific fields below instead
headlineFont	enum	See font list below	Typeface for headings and titles
bodyFont	enum	See font list below	Typeface for body text and paragraphs
labelFont	enum	See font list below	Typeface for labels, captions, and UI chrome
roundness	enum	ROUND_FOUR, ROUND_EIGHT, ROUND_TWELVE, ROUND_FULL	Border radius scale
saturation	int	1–4	Color vibrancy (1 = muted, 4 = vivid)
customColor	string	Hex color	Primary brand color
backgroundLight	string	Hex color	Light mode background
backgroundDark	string	Hex color	Dark mode background
preset	string	—	Optional preset theme name
description	string	—	Brief aesthetic description

Available fonts (28 options)

Sans-serif: INTER, DM_SANS, GEIST, SORA, MANROPE, RUBIK, MONTSERRAT, WORK_SANS, SPACE_GROTESK, PLUS_JAKARTA_SANS, PUBLIC_SANS, SOURCE_SANS_THREE, NUNITO_SANS, ARIMO, HANKEN_GROTESK, IBM_PLEX_SANS, SPLINE_SANS, LEXEND, EPILOGUE, BE_VIETNAM_PRO, METROPOLIS

Serif: NOTO_SERIF, NEWSREADER, DOMINE, LIBRE_CASLON_TEXT, EB_GARAMOND, LITERATA, SOURCE_SERIF_FOUR

projectId — optional, numeric only

✅ "3780309359108792857"
❌ "projects/3780309359108792857"

If provided, associates the design system with a specific project. If omitted, creates a global design system.

Mapping CSS tokens to DesignTheme

When creating from extracted design-tokens.css:

CSS Variable	→ DesignTheme field
--color-primary	customColor
--color-bg or --bg-light	backgroundLight
--bg-dark	backgroundDark
--font-family	font (map to closest enum value)
--radius or --border-radius	roundness (4px→FOUR, 8px→EIGHT, 12px→TWELVE, 16px+→FULL)

Output

Returns an Asset object with a name field — store this for future update_design_system and apply_design_system calls:

{
  "name": "assets/ds_abc123",
  "displayName": "SaaS Dashboard Theme",
  "designSystem": { ... }
}

After creating

• Store the name value (e.g., assets/ds_abc123) — you'll need it for apply/update
• Offer: "Apply this design system to existing screens?" → stitch-mcp-apply-design-system
• The orchestrator stores this for automatic application in Step 5b