Enquiry about Allowing other accounts to use Codex or Claude to access my Figma file

I have an enquiry would like to know for this case. Lets say i have 10 design projects in my figma account. but developer wants to use claude or codex to access the one of the projects and requested me for permission. but i am not sure if im wrong, from what i know i cannot give them my personal token access since they can see all 10 files in my account.and i cannot give them my login access. is there any other way around this to let them access a particular file safely in professional plan or do i need to upgrade to org plan to do this.  if you could explain the process it would be great for clarification.