I don't actually recommend this because, as the title suggests, there's a potential security risk here if someone gets ahold of your password or token, but it's still pretty cool to play with and it solved this problem so I thought I'd post it as an example.

I added a command to my mac that runs the "open" command and enabled parameters.

Then I used the /triggercmd "slash command" with the TRIGGERcmd Slack app to open Finder to my desktop folder:

/triggercmd open on mac with ~/Desktop

Here's the dangerous bit: I also found I could run any arbitrary command on my mac.

For example I could also run calculator with this command:

/triggercmd open on mac with -a calculator

The "open" command is a little too powerful because it lets you run any command. So if you do this, don't give out your token or password to triggercmd.com (it's never a good idea to give those out anyway).

I warned you but in case you want to do it anyway:

Use the GUI editor to add a command called open with open as the command, and enable parameters.

Go here and click the Add to Slack button.

Go to the Instructions page and copy your token.

In Slack, run this slash command to link your Slack account with your TRIGGERcmd account: /triggercmd-token [paste your token here]

Then run this slash command to test it: /triggercmd open on mac with ~/Desktop

Profit.

If you just want to open Calculator, a safer Slack command would be this, which runs the built-in calculator command on your default computer.