I haven't specifically tested this with Hermes, but I would expect so. Hermes is orchestrating things - it decides it needs to...whatever you want, book a trip for you. Forge will help make sure that the API calls to hotel booking sites parse correctly or gracefully retry.

Without forge, I'd guess a small model used for Hermes would have to retry entire workflows when an uncaught exception triggerd when it tried to reply with text when "calling a tool" ("Here is the tool call: [json blob]"). The issue there becomes partial successes can lead to state changes that need to be addressed (it booked the flight already, home it doesn't double-book).

Forge won't help with model reasoning quality though. If it the model thinks the right thing to do is to book 3 buses for your trip, forge doesn't care, it'll just make sure those api calls land.