Slack MCP Server

Instructions

Implementation Reference

• src/tools/users.ts:24-36 (handler)

  The main handler function that executes the get_user_info tool logic: parses args with schema, calls Slack users.info API, returns user info.

  export async function getUserInfo(client: SlackClientWrapper, args: unknown) {
    const params = getUserInfoSchema.parse(args);
  
    return await client.safeCall(async () => {
      const result = await client.getClient().users.info({
        user: params.user,
      });
  
      return {
        user: result.user,
      };
    });
  }

• src/utils/validators.ts:37-39 (schema)

  Zod input validation schema for get_user_info tool requiring a valid user ID.

  export const getUserInfoSchema = z.object({
    user: userIdSchema,
  });

• src/index.ts:137-150 (registration)

  Tool definition registered in the tools list for list_tools handler, including MCP input schema.

  {
    name: 'get_user_info',
    description: 'Get detailed information about a specific user',
    inputSchema: {
      type: 'object',
      properties: {
        user: {
          type: 'string',
          description: 'User ID (e.g., U1234567890)',
        },
      },
      required: ['user'],
    },
  },

• src/index.ts:422-422 (registration)

  Handler mapping in toolHandlers object that connects 'get_user_info' tool calls to the userTools.getUserInfo implementation.

  get_user_info: (args) => userTools.getUserInfo(slackClient, args),