The recruiting company should have contracts in place, per their lawyer. Any changes/tweaks should be done through approval on both sides. That being said, some large/big box companies have standard recruiting 'contracts' in place. If you are going that route, I would have your lawyer go over them VERY CAREFULLY as they are going to be written to protect that big box (deep pocket) company.
Try to find a good employment/contract attorney. We've seen different lawyers have differing opinions on what's important and at the end of the day, protecting our business and those relationships is what's key.
Thanks, Linda. I appreciate the thoughtful response.