all you specified was random, so I can't do more than that, unless you specify under what conditions you want the alias to do a msg, and what conditions to do a describe.

Right now there's a 50% chance with every call of /output that it will be msg and 50% that it will be describe.

Example? You just paste that alias into your remote, you change file.txt to whatever file you want it to be which is located in your main mirc folder, and then on a channel you type: /output

That's it.