Stitch MCP — Generate Screen from Text

Generates a UI design screen from a structured text prompt. This is the central action in any Stitch workflow — everything before it (spec generation, prompt assembly) is preparation, and everything after it (screen retrieval, code conversion) is follow-through.

Critical prerequisite

Only use this skill when the user explicitly mentions "Stitch" or when called from an upstream skill (e.g. stitch-ideate, stitch-orchestrator).

You must have a projectId before calling this. If you don't have one:

• Create a new project via stitch-mcp-create-project
• Or find an existing project via stitch-mcp-list-projects

When to use

• User asks to "design", "generate", "create", or "make" a screen using Stitch
• The orchestrator has assembled a prompt via stitch-ui-prompt-architect
• User provides specific visual requirements and wants a Stitch-generated result

Call the MCP tool

{
  "name": "generate_screen_from_text",
  "arguments": {
    "projectId": "3780309359108792857",
    "prompt": "[Full structured prompt — see below]",
    "deviceType": "MOBILE",
    "modelId": "GEMINI_3_1_PRO",
    "designSystem": "assets/15996705518239280238"
  }
}

Parameter reference

designSystem — optional, PREFIXED asset id

✅ "assets/15996705518239280238"
❌ "15996705518239280238"

This is how you get design consistency across generated screens — pass the name of a design system from stitch-mcp-create-design-system, stitch-mcp-create-design-system-from-design-md, or stitch-mcp-list-design-systems (used as-is, with the assets/ prefix). This is the opposite format from apply_design_system's assetId, which wants the prefix stripped.

projectId — numeric ID only, no projects/ prefix

✅ "3780309359108792857"
❌ "projects/3780309359108792857"

prompt — use the [Context] [Layout] [Components] structure

[Context & Style]
[Device] [Mode] [screen type] for [product]. [aesthetic]. [theme]. [colors]. [font].

[Layout]
[Describe the structural arrangement]

[Components]
[Specific named UI components with details]

For best results, use the stitch-ui-prompt-architect skill to assemble the prompt before calling this tool.

deviceType

Value	Use when
MOBILE	Mobile app, phone-sized UI (default if uncertain)
DESKTOP	Web dashboard, landing page, SaaS UI
TABLET	Tablet-specific layout
AGNOSTIC	Not tied to a specific device — responsive/fluid layout

modelId

Value	Use when
GEMINI_3_1_PRO	Recommended — complex layouts, high fidelity
GEMINI_3_FLASH	Fast iteration, wireframes, simple changes
GEMINI_3_PRO	Deprecated. Still works but will be removed. Use GEMINI_3_1_PRO instead.

After generating

This tool returns session info but not the actual screenshot/HTML. To retrieve the design:

1. Call stitch-mcp-list-screens with projects/[projectId] to find the new screen
2. Call stitch-mcp-get-screen with the projectId and screenId to get the screenshot and HTML

Prompt quality checklist

Before calling this tool, verify the prompt:

• Specifies device type consistently with deviceType parameter
• Names specific components (not "some buttons" — "primary 'Sign In' button")
• Includes colors (hex codes or clear color names)
• Uses realistic content (not Lorem Ipsum)
• Specifies light or dark mode explicitly

Batch generation from full PRDs

When the prompt is a complete PRD document (product overview, design system, multiple screen specifications, build guide), Stitch will generate multiple screens in a single call — not just one. Stitch generates up to 10 screens per call. A PRD with 8 screen specs typically produces 5-7 screens automatically.

This is the same mechanism Stitch's web Ideate uses for "generate all screens". The PRD format acts as a comprehensive prompt that Stitch decomposes internally.

How to use batch generation:

1. Send the full PRD text as the prompt parameter

2. Stitch generates up to ~10 screens per call from a multi-screen PRD

3. Two possible outcomes depending on whether the MCP response times out:

   If response returns with data:

   • Check output_components for continuation suggestions (e.g. "Yes, make them all", "Generate remaining screens")
   • Automatically call generate_screen_from_text again with the suggestion text as the prompt — the user already initiated generation, no need to re-confirm
   • Repeat until no more output_components suggestions appear (max 3 continuation calls to prevent infinite loops)

   If response returns empty (HTTP timeout):

   • Generation is still running server-side — do NOT retry
   • Wait 90-120 seconds, then call list_screens to discover what was generated
   • If empty, wait another 60 seconds and retry the list call
   • Generate any missing screens individually with focused prompts referencing the PRD's design system

Timing

Stitch generation takes 60–180 seconds for single screens and up to 5 minutes for multi-screen PRD generation. This is normal behavior, not a timeout.

• Do NOT retry during this window
• Do NOT assume failure if it takes > 60 seconds
• The MCP tool may return empty for long generations — check list_screens afterward
• If it fails: wait 90 seconds, check list_screens, retry ONCE max if nothing appeared
• Each call creates a new generation — retries mean duplicate screens

References

• examples/desktop.md — Desktop dashboard prompts (SaaS analytics, admin panel)
• examples/mobile.md — Mobile app prompts (login, social feed, e-commerce)