Claude Talk to Figma MCP

Instructions

Implementation Reference

• src/talk_to_figma_mcp/tools/document-tools.ts:300-346 (registration)

  MCP tool registration for 'join_channel', including input schema, description, and the handler function that validates input and calls the joinChannel helper.

  server.tool(
    "join_channel",
    "Join a specific channel to communicate with Figma",
    {
      channel: z.string().describe("The name of the channel to join").default(""),
    },
    async ({ channel }) => {
      try {
        if (!channel) {
          // If no channel provided, ask the user for input
          return {
            content: [
              {
                type: "text",
                text: "Please provide a channel name to join:",
              },
            ],
            followUp: {
              tool: "join_channel",
              description: "Join the specified channel",
            },
          };
        }
  
        // Use joinChannel instead of sendCommandToFigma to ensure currentChannel is updated
        await joinChannel(channel);
        
        return {
          content: [
            {
              type: "text",
              text: `Successfully joined channel: ${channel}`,
            },
          ],
        };
      } catch (error) {
        return {
          content: [
            {
              type: "text",
              text: `Error joining channel: ${error instanceof Error ? error.message : String(error)}`,
            },
          ],
        };
      }
    }
  );

• src/talk_to_figma_mcp/utils/websocket.ts:169-182 (helper)

  Helper function joinChannel that sends the 'join' command to Figma via WebSocket and updates the currentChannel state. Called by the MCP tool handler.

  export async function joinChannel(channelName: string): Promise<void> {
    if (!ws || ws.readyState !== WebSocket.OPEN) {
      throw new Error("Not connected to Figma");
    }
  
    try {
      await sendCommandToFigma("join", { channel: channelName });
      currentChannel = channelName;
      logger.info(`Joined channel: ${channelName}`);
    } catch (error) {
      logger.error(`Failed to join channel: ${error instanceof Error ? error.message : String(error)}`);
      throw error;
    }
  }