Slack MCP Server

Instructions

Implementation Reference

• src/tools/reactions.ts:23-40 (handler)

  The core handler function for the 'remove_reaction' tool. It validates input using removeReactionSchema, calls the Slack API to remove the reaction, and returns a success response.

  export async function removeReaction(client: SlackClientWrapper, args: unknown) {
    const params = removeReactionSchema.parse(args);
  
    return await client.safeCall(async () => {
      await client.getClient().reactions.remove({
        channel: params.channel,
        timestamp: params.timestamp,
        name: params.name,
      });
  
      return {
        ok: true,
        channel: params.channel,
        timestamp: params.timestamp,
        reaction: params.name,
      };
    });
  }

• src/utils/validators.ts:101-105 (schema)

  Zod schema for validating the input parameters of the remove_reaction tool: channel ID, message timestamp, and emoji name.

  export const removeReactionSchema = z.object({
    channel: channelIdSchema,
    timestamp: timestampSchema,
    name: emojiSchema,
  });

• src/index.ts:374-395 (registration)

  Tool registration metadata including name, description, and input schema definition used in list_tools response.

  {
    name: 'remove_reaction',
    description: 'Remove an emoji reaction from a message',
    inputSchema: {
      type: 'object',
      properties: {
        channel: {
          type: 'string',
          description: 'Channel ID',
        },
        timestamp: {
          type: 'string',
          description: 'Message timestamp',
        },
        name: {
          type: 'string',
          description: 'Emoji name (without colons)',
        },
      },
      required: ['channel', 'timestamp', 'name'],
    },
  },

• src/index.ts:438-438 (registration)

  Handler function registration in the toolHandlers map, binding 'remove_reaction' to the implementation in reactionTools.

  remove_reaction: (args) => reactionTools.removeReaction(slackClient, args),