LINE Bot MCP Server

Instructions

Implementation Reference

• src/tools/getProfile.ts:35-47 (handler)

  The handler function that fetches the LINE user profile using the provided userId, handles missing userId errors, and returns formatted success or error responses.

    async ({ userId }) => {
      if (!userId) {
        return createErrorResponse(NO_USER_ID_ERROR);
      }
  
      try {
        const response = await this.client.getProfile(userId);
        return createSuccessResponse(response);
      } catch (error) {
        return createErrorResponse(`Failed to get profile: ${error.message}`);
      }
    },
  );

• src/tools/getProfile.ts:22-27 (schema)

  Zod schema definition for the optional 'userId' input parameter, defaulting to the destination user ID.

  const userIdSchema = z
    .string()
    .default(this.destinationId)
    .describe(
      "The user ID to get a profile. Defaults to DESTINATION_USER_ID.",
    );

• src/tools/getProfile.ts:29-47 (registration)

  Core registration of the 'get_profile' tool on the MCP server within the GetProfile class's register method, including name, description, schema, and handler.

  server.tool(
    "get_profile",
    "Get detailed profile information of a LINE user including display name, profile picture URL, status message and language.",
    {
      userId: userIdSchema,
    },
    async ({ userId }) => {
      if (!userId) {
        return createErrorResponse(NO_USER_ID_ERROR);
      }
  
      try {
        const response = await this.client.getProfile(userId);
        return createSuccessResponse(response);
      } catch (error) {
        return createErrorResponse(`Failed to get profile: ${error.message}`);
      }
    },
  );

• src/index.ts:65-65 (registration)

  Instantiates the GetProfile tool with MessagingApiClient and destinationId, then invokes its register method to add the tool to the MCP server.

  new GetProfile(messagingApiClient, destinationId).register(server);