Cursor Talk to Figma MCP

Instructions

Implementation Reference

• src/talk_to_figma_mcp/server.ts:605-643 (registration)

  Registration of the 'set_fill_color' MCP tool, including the description, input schema using Zod, and the handler function that proxies the command to the Figma plugin via sendCommandToFigma.

  server.tool(
    "set_fill_color",
    "Set the fill color of a node in Figma can be TextNode or FrameNode",
    {
      nodeId: z.string().describe("The ID of the node to modify"),
      r: z.number().min(0).max(1).describe("Red component (0-1)"),
      g: z.number().min(0).max(1).describe("Green component (0-1)"),
      b: z.number().min(0).max(1).describe("Blue component (0-1)"),
      a: z.number().min(0).max(1).optional().describe("Alpha component (0-1)"),
    },
    async ({ nodeId, r, g, b, a }) => {
      try {
        const result = await sendCommandToFigma("set_fill_color", {
          nodeId,
          color: { r, g, b, a: a || 1 },
        });
        const typedResult = result as { name: string };
        return {
          content: [
            {
              type: "text",
              text: `Set fill color of node "${typedResult.name
                }" to RGBA(${r}, ${g}, ${b}, ${a || 1})`,
            },
          ],
        };
      } catch (error) {
        return {
          content: [
            {
              type: "text",
              text: `Error setting fill color: ${error instanceof Error ? error.message : String(error)
                }`,
            },
          ],
        };
      }
    }
  );

• src/talk_to_figma_mcp/server.ts:615-642 (handler)

  The core handler function for the set_fill_color tool. It takes nodeId and RGBA values, sends a 'set_fill_color' command to the underlying Figma plugin, and returns a formatted success message with the node name or an error message.

  async ({ nodeId, r, g, b, a }) => {
    try {
      const result = await sendCommandToFigma("set_fill_color", {
        nodeId,
        color: { r, g, b, a: a || 1 },
      });
      const typedResult = result as { name: string };
      return {
        content: [
          {
            type: "text",
            text: `Set fill color of node "${typedResult.name
              }" to RGBA(${r}, ${g}, ${b}, ${a || 1})`,
          },
        ],
      };
    } catch (error) {
      return {
        content: [
          {
            type: "text",
            text: `Error setting fill color: ${error instanceof Error ? error.message : String(error)
              }`,
          },
        ],
      };
    }
  }

• src/talk_to_figma_mcp/server.ts:608-614 (schema)

  Zod schema for validating input parameters to the set_fill_color tool: nodeId (string), r/g/b (numbers 0-1), a (optional number 0-1).

  {
    nodeId: z.string().describe("The ID of the node to modify"),
    r: z.number().min(0).max(1).describe("Red component (0-1)"),
    g: z.number().min(0).max(1).describe("Green component (0-1)"),
    b: z.number().min(0).max(1).describe("Blue component (0-1)"),
    a: z.number().min(0).max(1).optional().describe("Alpha component (0-1)"),
  },