MCP-Discord

Instructions

Implementation Reference

• src/index.ts:738-778 (handler)

  The main execution logic for the 'discord_reply_to_forum' tool. Fetches the specified thread by ID, validates it supports sending messages, and sends the provided message as a reply.

  case "discord_reply_to_forum": {
    const { threadId, message } = ReplyToForumSchema.parse(args);
    try {
      if (!client.isReady()) {
        return {
          content: [{ type: "text", text: "Discord client not logged in. Please use discord_login tool first." }],
          isError: true
        };
      }
  
      const thread = await client.channels.fetch(threadId);
      if (!thread || !(thread.isThread())) {
        return {
          content: [{ type: "text", text: `Cannot find thread with ID: ${threadId}` }],
          isError: true
        };
      }
  
      if (!('send' in thread)) {
        return {
          content: [{ type: "text", text: `This thread does not support sending messages` }],
          isError: true
        };
      }
  
      // Send the reply
      const sentMessage = await thread.send(message);
  
      return {
        content: [{ 
          type: "text", 
          text: `Successfully replied to forum post. Message ID: ${sentMessage.id}` 
        }]
      };
    } catch (error) {
      return {
        content: [{ type: "text", text: `Failed to reply to forum post: ${error}` }],
        isError: true
      };
    }
  }

• src/index.ts:163-166 (schema)

  Zod input validation schema for the tool, defining required string parameters 'threadId' and 'message'.

  const ReplyToForumSchema = z.object({
      threadId: z.string(),
      message: z.string()
  });

• src/index.ts:266-277 (registration)

  Tool registration in the MCP server's tool list, providing name, description, and JSON schema for inputs.

  {
    name: "discord_reply_to_forum",
    description: "Adds a reply to an existing forum post or thread",
    inputSchema: {
      type: "object",
      properties: {
        threadId: { type: "string" },
        message: { type: "string" }
      },
      required: ["threadId", "message"]
    }
  },