But for better confidentiality, you can get to know and be familiar with the corresponding patent agents first, which is of course better and more trustworthy.
3 agents and agencies, reputation is the first; If the reputation is bad, there will be no business in the future; The patent agency association will also revoke the agent's license; If it is serious, you should bear criminal responsibility.
4 If the agent is found to have leaked (you need to confirm that you have leaked), you can negotiate; If negotiation fails, you can go to the local patent office for handling; At the same time, you can go to China Agency Association.
Suggestion: Understand communication first. If you think it's okay, do it for him. In addition, before you submit technical information, you should sign a confidentiality agreement.
I hope it works for you.