> It’s often the case in the situation you’re describing that the TL is interested in moving into management, and this is a “try out” effectively. Personally I like to be open about situations like this, although there are valid arguments against that. In any event, I think most people would agree that it’s best do such “try outs” when the stakes are relatively low, and the TL can have an easy escape if they need it.

The best way I’ve seen to accomplish this is have a job title that’s purposefully ambiguous. Usually I’ve seen this as a “lead engineer”, which can come with or without direct reports. This lets people try out management while giving them space to change their mind without losing title or status.