update_drawing
Modify existing Excalidraw diagrams by providing new content to update specific drawings identified by their unique ID.
Instructions
Update an Excalidraw drawing by ID
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| id | Yes | ||
| content | Yes |
Implementation Reference
- src/operations/drawings.ts:102-128 (handler)Core handler function that updates the drawing content in the JSON file and updates the metadata with new timestamp.
export async function updateDrawing(id: string, content: string): Promise<{ id: string, name: string }> { await ensureStorageDir(); // Get the drawing file path const filePath = path.join(STORAGE_DIR, `${id}.json`); const metadataPath = path.join(STORAGE_DIR, `${id}.meta.json`); try { // Check if the drawing exists await fs.access(filePath); // Read the metadata const metadataStr = await fs.readFile(metadataPath, 'utf-8'); const metadata = JSON.parse(metadataStr); // Update the drawing content await fs.writeFile(filePath, content, 'utf-8'); // Update the metadata metadata.updatedAt = new Date().toISOString(); await fs.writeFile(metadataPath, JSON.stringify(metadata, null, 2), 'utf-8'); return { id, name: metadata.name }; } catch (error) { throw new ExcalidrawResourceNotFoundError(`Drawing with ID ${id} not found`); } } - index.ts:129-135 (handler)MCP server handler case that parses arguments using the schema and calls the updateDrawing function.
case "update_drawing": { const args = drawings.UpdateDrawingSchema.parse(request.params.arguments); const result = await drawings.updateDrawing(args.id, args.content); return { content: [{ type: "text", text: JSON.stringify(result, null, 2) }], }; } - src/operations/drawings.ts:31-34 (schema)Zod schema defining the input parameters: id (string) and content (string).
export const UpdateDrawingSchema = z.object({ id: z.string().min(1), content: z.string().min(1), }); - index.ts:73-76 (registration)Tool registration in the ListTools response, including name, description, and input schema.
name: "update_drawing", description: "Update an Excalidraw drawing by ID", inputSchema: zodToJsonSchema(drawings.UpdateDrawingSchema), },