1609. The agent is obliged to execute the agency which he or she has accepted, and he or she is liable for damages resulting from his or her non-execution of it while his or her authority continues.
He or she is obliged, after the extinction of the agency, to do whatever is a necessary consequence of acts done before, and if the extinction be by the death of the principal, he or she is obliged to complete business which is urgent and cannot be delayed without risk of loss or injury.
1610. The agent is bound to exercise, in the execution of the agency, reasonable skill and all the care of a prudent administrator.
Nevertheless, if the agency be gratuitous, the Court may moderate the liability arising from his negligence or fault, according to the circumstances.
1611. The agent is answerable for the person whom he substitutes in the execution of the agency, when he or she has no power of substitution; and if the agent be injured by reason of the substitution he or she may repudiate the acts of the substitute.
The agent is answerable in like manner when he or she is empowered to substitute, without designation of the person to be substituted, and he or she appoints one who is notoriously unfit.
In all these cases the principal has a direct action against the person substituted by the agent.
1612. When several agents are appointed together for the same business, they are jointly and severally liable for each other's acts of administration, unless it is otherwise stipulated.
1613. The agent is bound to render an account of his or her administration, and to deliver and pay over all that he or she has received under the authority of the agency, even if it were not due; but he or she may deduct therefrom the amount of his or her disbursements and charges in the execution of the agency.
If he or she has received a determinate thing he or she is entitled to retain it until such disbursements and charges are paid.
1614. He or she is bound to pay interest upon the money of the principal which he or she employs for his or her own use, from the day of so employing it, and upon any remainder due to the principal, from the time of being placed in default.