Cursor Talk to Figma MCP

Instructions

Implementation Reference

• src/cursor_mcp_plugin/code.js:1065-1114 (handler)

  Core handler function that executes the set_corner_radius logic using Figma API. Retrieves the node by ID, validates support for cornerRadius, and sets uniform radius or individual corner radii based on the 'corners' parameter.

  async function setCornerRadius(params) {
    const { nodeId, radius, corners } = params || {};
  
    if (!nodeId) {
      throw new Error("Missing nodeId parameter");
    }
  
    if (radius === undefined) {
      throw new Error("Missing radius parameter");
    }
  
    const node = await figma.getNodeByIdAsync(nodeId);
    if (!node) {
      throw new Error(`Node not found with ID: ${nodeId}`);
    }
  
    // Check if node supports corner radius
    if (!("cornerRadius" in node)) {
      throw new Error(`Node does not support corner radius: ${nodeId}`);
    }
  
    // If corners array is provided, set individual corner radii
    if (corners && Array.isArray(corners) && corners.length === 4) {
      if ("topLeftRadius" in node) {
        // Node supports individual corner radii
        if (corners[0]) node.topLeftRadius = radius;
        if (corners[1]) node.topRightRadius = radius;
        if (corners[2]) node.bottomRightRadius = radius;
        if (corners[3]) node.bottomLeftRadius = radius;
      } else {
        // Node only supports uniform corner radius
        node.cornerRadius = radius;
      }
    } else {
      // Set uniform corner radius
      node.cornerRadius = radius;
    }
  
    return {
      id: node.id,
      name: node.name,
      cornerRadius: "cornerRadius" in node ? node.cornerRadius : undefined,
      topLeftRadius: "topLeftRadius" in node ? node.topLeftRadius : undefined,
      topRightRadius: "topRightRadius" in node ? node.topRightRadius : undefined,
      bottomRightRadius:
        "bottomRightRadius" in node ? node.bottomRightRadius : undefined,
      bottomLeftRadius:
        "bottomLeftRadius" in node ? node.bottomLeftRadius : undefined,
    };
  }

• src/talk_to_figma_mcp/server.ts:1213-1255 (registration)

  MCP tool registration for 'set_corner_radius', including Zod input schema (nodeId: string, radius: number >=0, optional corners: boolean[4]) and handler that proxies the command to the Figma plugin via sendCommandToFigma.

  server.tool(
    "set_corner_radius",
    "Set the corner radius of a node in Figma",
    {
      nodeId: z.string().describe("The ID of the node to modify"),
      radius: z.number().min(0).describe("Corner radius value"),
      corners: z
        .array(z.boolean())
        .length(4)
        .optional()
        .describe(
          "Optional array of 4 booleans to specify which corners to round [topLeft, topRight, bottomRight, bottomLeft]"
        ),
    },
    async ({ nodeId, radius, corners }) => {
      try {
        const result = await sendCommandToFigma("set_corner_radius", {
          nodeId,
          radius,
          corners: corners || [true, true, true, true],
        });
        const typedResult = result as { name: string };
        return {
          content: [
            {
              type: "text",
              text: `Set corner radius of node "${typedResult.name}" to ${radius}px`,
            },
          ],
        };
      } catch (error) {
        return {
          content: [
            {
              type: "text",
              text: `Error setting corner radius: ${error instanceof Error ? error.message : String(error)
                }`,
            },
          ],
        };
      }
    }
  );

• src/cursor_mcp_plugin/code.js:151-152 (handler)

  Dispatch handler in the Figma plugin's command router that calls the setCornerRadius implementation.

  case "set_corner_radius":
    return await setCornerRadius(params);

• src/cursor_mcp_plugin/code.js:301-303 (helper)

  Helper function filterFigmaNode extracts and includes cornerRadius when serializing node data for MCP responses.

  if (node.cornerRadius !== undefined) {
    filtered.cornerRadius = node.cornerRadius;
  }