Undocumented requirement that items must be a "Login"

[ipsi]

Looking at op.go, we see that it restricts the search to "--categories", "login", but that isn't documented anywhere, causing a silent failure if you have it stored as, say, an "API Credential", which wouldn't be unreasonable.

It would also be nice if the tag requirement was mentioned earlier on, under the "Features" header - I didn't realise it was documented until after I'd seen it in the source code.

[ethrgeist]

Howdy,

we see that it restricts the search to "--categories", "login", but that isn't documented anywhere

True, the first versions did not have the option to specific which fields should be used to lookup username and password.
Now that there are parameters to set them to something else then the assumed defaults for "logins", it's reasonable to also add a way to override the category.

Is that what you are looking for?

The tag requirement is mentioned in the "how credentials are found" chapter of the read.me, is that what you needed to know?
What would you suggest would be a more prominent place?