Cursor Talk to Figma MCP

Instructions

Implementation Reference

• src/talk_to_figma_mcp/server.ts:585-612 (handler)

  The handler function that implements the core logic of the 'set_fill_color' tool. It sends a 'set_fill_color' command to the Figma plugin with the provided node ID and RGBA color values, handles the response, and returns a formatted success or 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:579-584 (schema)

  The Zod input schema for the 'set_fill_color' tool, validating the nodeId and RGBA color components (r, g, b required between 0-1, a optional).

    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)"),
  },

• src/talk_to_figma_mcp/server.ts:575-613 (registration)

  The registration of the 'set_fill_color' tool on the MCP server using server.tool(), including name, description, input schema, and handler function.

  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)
                }`,
            },
          ],
        };
      }
    }
  );