I gather that you are asking for the offroll employees who have been hired through a third party agency. Well, in that case, you become the principal employer and it becomes your responsibility to ensure that the agency is complying to all the mandates related to Labour laws. You even need to audit them to ensure that.
But, since you are not the actual/immediate employer, you cannot impose your organization's policy on them. You cannot show direct supervision as an employer. You need to ensure that the required policy is shared to those employees through their respective agency only. Else, you may end up with legal cases wherein these employees start claiming direct employment with your organization.
Rather, I suggest, you include the said HR policies (Recruitment, Appraisal, Compensation etc.) for them in the agreement/amendment to the agreement with the agency or communicate to them separately.
I have pretty good experience of managing these associates/offrolls.
Pls feel free to call me if you need any further guidance.
A. Gaekwad
9227209777