A principal is always liable for torts committed while the agent completes their official responsibilities. For torts occurring outside of official duties, the liability of the principal depends on whether the agent's tort occurred during a frolic or a detour.
An unidentified or partially disclosed principal is one that the other party to a transaction knows only that the agent may be acting on behalf of but not the identity of that principal; both the agent and the undisclosed principal are liable for such transactions.
Similarly, if the agent or principal loses capacity to enter into an agency relationship, it is suspended or terminated. The agency terminates if its purpose becomes illegal. Even though authority has terminated, whether by action of the parties or operation of law, the principal may still be subject to liability.
A principal can be held directly liable for their agent's tortious conduct when their agent is acting with actual or true authority on the principal's behalf.
Principal's liability for acts of agent A principal is normally liable for all acts of an agent within the agent's authority, whether responsibility arises in contract or in tort. Authority means the agent's actual, apparent (ostensible) or usual (customary) authority.
A person is always liable for her own torts, so an agent who commits a tort is liable; if the tort was in the scope of employment the principal is liable too. Unless the principal put the agent up to committing the tort, the agent will have to reimburse the principal.
This is especially true if the third party is made aware of the agent's authority limitations. In this situation, the third party may still attempt to sue the principal for any damages caused. However, the principal can then turn around and sue the agent to recover any damages caused.
Additionally, principals can be held liable for the torts of their agents under the doctrine of vicarious liability. A principal is always liable for torts committed while the agent completes their official responsibilities.
An agent is not generally liable for contracts made; the principal is liable. But the agent will be liable if he is undisclosed or partially disclosed, if the agent lacks authority or exceeds it, or, of course, if the agent entered into the contract in a personal capacity.