1. First of all, I suggest that you don't sign on behalf of the boss, which is definitely a legal risk.

2. If this happens frequently, I suggest you ask your boss for an authorized signature procedure. For example, this program clearly indicates that the boss entrusts XXX to sign some contract documents on his behalf, and then you can sign on his behalf with the official seal, which meets the statutory entrustment conditions.

If you have signed it and the boss has approved it, you don't need to take responsibility except for the problem. What happens at this time is apparent agency. Simply put, if you sign the agreement with your official seal, the other party can think that it is your boss's behavior, and your boss bears the rights and obligations.

As a newcomer in the workplace, I suggest you be cautious.

You can continue to consult if you have any questions, and please adopt them if you are satisfied.