when to use slack mentions as arguments is common source of confusion

[bobheadxi]

There are a few threads and questions raised where it seems unclear when to use Slack mentions (e.g. @robert or #my-channel), for example when providing --lead to team create

Maybe there's some programatic checks we can add, or some improved documentation, to alleviate this

[chuck-sys]

I think that programmatic checks should be the way to go. Currently the state of error reporting from the app is pretty bad, with unhelpful errors that make it difficult to debug (some of them anyway). Planning on a small rewrite on where the errors get thrown and taken so that error messages are better separated and have more context (in both slack and logs). See #515.