If the discharge has another 3p caveat, then generally you'd have to get that discharged also before sending it to a server. Either way, in each deployment a s

If the discharge has another 3p caveat, then generally you'd have to get that discharged also before sending it to a server. Either way, in each deployment a server supports a set of caveats that makes sense and rejects others. Or that's the intention of the original idea (I'm an author of the paper). I can't speak for macaroonjs specifically.