stitch::manage-design-system
Manage design systems in Stitch using MCP tools. Includes retrieval of assets, creating/updating design systems in Stitch, and applying them to screens.
What this skill does
# Design-System
Create a "source of truth" for your project's design language to ensure
consistency across all future screens.
> [!NOTE]
> Refer to your system prompt for instruction on handling MCP tool prefixes for
> all tools mentioned in this skill (e.g., `get_screen`,
> `create_design_system_from_design_md`, `apply_design_system`).
## 📥 Retrieval
To analyze a Stitch project, you must retrieve metadata and assets using the
Stitch MCP tools:
1. **Project lookup**: Use `list_projects` to find the target `projectId`.
2. **Screen lookup**: Use `list_screens` for that `projectId` to find
representative screens (e.g., "Home", "Main Dashboard").
3. **Metadata fetch**: Call `get_screen` for the target screen to get
`screenshot.downloadUrl` and `htmlCode.downloadUrl`.
4. **Asset download**: Use `read_url_content` to fetch the HTML code.
## 🧠 Synthesis from Description
If you need to extract a design system from existing screens, use the `design-md` skill (in the `stitch-utilities` plugin).
If there are no existing screens (new project), or the user provides a direct description (e.g., "dark theme, blue and purple, rounded, Inter font"):
1. Map the user's vague terms to precise values using the design mappings (see `design-md` skill in `stitch-utilities` or `generate-design` skill).
2. Select concrete hex codes, font families, and roundness values.
3. Generate the `DESIGN.md` file (refer to the `design-md` skill in `stitch-utilities` for structure).
4. Proceed to the "Create or Update Design System in Stitch" step below.
## 📝 Output Structure
The `DESIGN.md` file should follow the structure defined in the `design-md` skill (in the `stitch-utilities` plugin).
## 🚀 Create or Update Design System in Stitch
After generating `.stitch/DESIGN.md`, make sure to also create or update the
design system in Stitch.
**Two-step design system creation:**
> [!WARNING]
> **Checkpoint — User Confirmation Required.**
> Before uploading, you **MUST** pause and ask the user for
> confirmation. Present a summary of the design system you are about to create
> (display name, key colors, fonts, and roundness) and wait for explicit approval
> before proceeding. Do **NOT** upload until the user confirms.
1. **Upload `DESIGN.md`**:
- **Option A (Recommended - Uploader Script)**: Use the modified `upload-to-stitch` Python script which natively handles `.md` files. It base64-encodes the markdown file in-process and sends it to the `/v1/projects/{projectId}/screens:batchCreate` endpoint, bypassing output token limits.
```bash
python3 stitch-skills/plugins/stitch-design/skills/upload-to-stitch/scripts/upload_to_stitch.py \
--project-id <PROJECT_ID> \
--file-path /path/to/DESIGN.md \
--api-key <API_KEY>
```
This returns the `sourceScreen` ID and the `screenInstance` ID.
- **Option B (Direct MCP Tool)**: If the `DESIGN.md` is small (under ~5KB), you can call the `upload_design_md` MCP tool directly, passing the base64-encoded design markdown content as `designMdBase64`.
2. **Create Design System**: Call the `create_design_system_from_design_md` tool immediately after the upload, passing the `projectId` and the `selectedScreenInstance` (containing the `id` and `sourceScreen` returned from the upload step).
Once the upload script and `create_design_system_from_design_md` have both completed,
Stitch holds the design tokens at the project level — you do NOT need to repeat
them in generation prompts.
## 🎨 Apply Design System to Screens
Use `apply_design_system` to apply a design system to existing screens.
> [!IMPORTANT]
> `selectedScreenInstances` must contain **only** `id` and `sourceScreen` — do
> NOT include position/dimension fields (`x`, `y`, `width`, `height`) or the
> request will fail with "invalid argument". Get the screen instance IDs from
> `get_project`.
```json
{
"projectId": "...",
"assetId": "...",
"selectedScreenInstances": [
{
"id": "...",
"sourceScreen": "projects/.../screens/..."
}
]
}
```
**How to get the required IDs:**
1. Call `get_project` to retrieve `screenInstances` — each has an `id` and
`sourceScreen`.
2. Call `list_design_systems` to retrieve the design system `name` (format:
`assets/{assetId}`) — use the part after `assets/` as the `assetId`.
3. Filter out any instances with `type: "DESIGN_SYSTEM_INSTANCE"` — only pass
real screens.
## 📋 Update Project Metadata
After writing `.stitch/DESIGN.md`, also create or update `.stitch/metadata.json`
to track the `projectId`, `title`, all known screens, and design system summary.
See [examples/metadata.json](examples/metadata.json) for the format.
## Schema Reference
See [reference/tool-schema.md](reference/tool-schema.md) for the full
`designSystem` object schema with all available options.
## 💡 Best Practices
Refer to the `design-md` skill (in the `stitch-utilities` plugin) for best practices on describing design elements.
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