MCP Examples

1. Generate and preview a screen

The most common workflow: generate a screen (creating the file in the same step), then view the result.

1. create-new-design { "message": "Mobile sign-in screen for a developer tool.
                                  Email/password fields, Google SSO button, dark theme." }
                     → { "fileId": "FILE_ID", "screenIds": ["SCREEN_ID"] }

2. get-screen-image  { "fileId": "FILE_ID", "screenId": "SCREEN_ID" }
                     → [inline PNG]

Omitting fileId creates a new file automatically. Pass an existing fileId to add screens to that file instead. Prompt to your AI assistant:

Generate a Flowstep design: a mobile sign-in screen for a developer tool with email/password and a Google SSO button in dark theme, then show me the image.

2. Visualise a React component

Upload a .jsx or .tsx file as an attachment and ask Flowstep to generate a matching design. Flowstep reads the source and produces a screen — no need to run the app.

1. upload-attachment  { "fileData": "<UTF-8 contents of ApiKeys.tsx>",
                        "fileName": "ApiKeys.tsx",
                        "mimeType": "text/javascript" }
                      → { "id": "ATT_ID", "path": "...", "type": "document",
                          "mimeType": "text/javascript" }

2. create-new-design  { "message": "Generate a desktop screen that matches this React component.",
                        "attachments": [{ "id": "ATT_ID", "path": "...", "type": "document" }] }
                      → { "fileId": "FILE_ID", "screenIds": ["SCREEN_ID"] }

3. get-screen-image   { "fileId": "FILE_ID", "screenId": "SCREEN_ID" }
                      → [inline PNG]

Prompt to your AI assistant:

Read src/components/settings/ApiKeys.tsx, upload it as an attachment, and generate a Flowstep screen that matches the component layout. Show me the rendered image.

3. Iterate on an MCP-generated screen

edit-design and regenerate-design require design context that is only present on screens generated with a designs array. For screens generated without one, the workaround is to render the screen as an attachment and call create-new-design with the image.

1. upload-attachment  { "fileId": "FILE_ID", "screenId": "SCREEN_ID" }
                      → { "id": "ATT_ID", "path": "...", "type": "image", "mimeType": "image/jpeg" }

2. create-new-design  { "fileId": "FILE_ID",
                        "message": "Change the color scheme to dark mode and
                                    add a 'Remember me' checkbox below the password field.",
                        "attachments": [{ "id": "ATT_ID", "path": "...", "type": "image" }] }
                      → { "fileId": "FILE_ID", "screenIds": ["NEW_SCREEN_ID"] }

3. get-screen-image   { "fileId": "FILE_ID", "screenId": "NEW_SCREEN_ID" }
                      → [inline PNG]

For screens that do have design context, call edit-design directly with the change in message and the screen in targets.

4. Expand a screen to a full flow

Add follow-on screens to an existing design.

1. list-screens   { "fileId": "FILE_ID" }
                  → [{ "screenId": "BASE_SCREEN_ID", "prompt": "Sign-in screen", ... }]

2. expand-design  { "fileId": "FILE_ID",
                    "message": "Add the next screen in the user flow",
                    "operationVariant": "next_screen",
                    "targets": ["BASE_SCREEN_ID"] }
                  → { "fileId": "FILE_ID", "screenIds": ["NEXT_SCREEN_ID"] }

3. get-screen-image { "fileId": "FILE_ID", "screenId": "NEXT_SCREEN_ID" }
                    → [inline PNG]

Repeat step 2 with operationVariant: "error_state" or "empty_state" to add edge-case screens.

operationVariant is a required parameter for expand-design. The base screen must also have been generated with a designs array (design context) — for screens without it, use the attachment workaround from Example 3.

5. Audit quota before a batch job

Check remaining capacity before kicking off multiple generations.

get-plan-details {}
→ {
    "remaining": {
      "messages": { "daily": 38, "monthly": 413 }
    }
  }

If daily is low, schedule the batch for after 00:00 UTC when it resets.

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1. Generate and preview a screen

2. Visualise a React component

3. Iterate on an MCP-generated screen

4. Expand a screen to a full flow

5. Audit quota before a batch job

​1. Generate and preview a screen

​2. Visualise a React component

​3. Iterate on an MCP-generated screen

​4. Expand a screen to a full flow

​5. Audit quota before a batch job

1. Generate and preview a screen

2. Visualise a React component

3. Iterate on an MCP-generated screen

4. Expand a screen to a full flow

5. Audit quota before a batch job