Cursor Talk to Figma MCP

Instructions

Implementation Reference

• src/talk_to_figma_mcp/server.ts:1330-1372 (registration)

  Full registration of the 'set_corner_radius' tool including schema definition, input validation with Zod, and the handler function 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/talk_to_figma_mcp/server.ts:1344-1371 (handler)

  The handler function executes the tool logic: sends 'set_corner_radius' command to Figma plugin with parameters, handles response or error, and returns MCP-formatted content.

  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/talk_to_figma_mcp/server.ts:1333-1343 (schema)

  Zod schema for input validation: requires nodeId and radius (non-negative number), optional corners array of exactly 4 booleans.

  {
    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]"
      ),
  },

• src/talk_to_figma_mcp/server.ts:286-288 (helper)

  In filterFigmaNode helper function, preserves cornerRadius property when filtering node data for responses.

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