Showami is available in all 50 states to both NAR (National Association of Realtors) and non-NAR affiliated licensees. Showing agents and initiating agents are to cooperate with each other to comply with state laws. Typically it is the responsibility of the initiating agent to communicate with their client and get any necessary forms signed. This page provides links to the NAR Settlement FAQ page along with links to the Real Estate Commission in each state.
Showami does not require Buyer Agreements. We do not enforce any regulation or agreement because we are not a real estate brokerage, regulatory agency or trade association. There are scenarios within the NAR Settlement Agreement that allow property tours without a buyer agency. Listing agents who show homes to unrepresented buyers are not required to have a buyer agreement as just one example.
For NAR Members who have a Buyer Agreement with a client being shown a home, it is permissible to have another agent show the home on their behalf. Reference Site (Article 62): https://www.nar.realtor/the-facts/nar-settlement-faqs.
If a listing agent represents a seller and an unrepresented buyer wants to view their listing. That listing agent or an agent acting on the listing agent's behalf may show the property without a "Buyer's Agreement". Reference Site (Article 61): https://www.nar.realtor/the-facts/nar-settlement-faqs
Other situations include Open Houses, Rental Showings initiated by a property management company/landlord, and various tasks like property reports and opening the doors for inspectors and appraisers. Non-NAR affiliated real estate agents in states where Buyer Agreements are not required would also not be required to have a Buyer Agreement.
It depends on what your buyer agreement states. Some buyer agreements already have clauses that inform buyers that showings may from time to time be delegated. Other buyer agreements are vague about showing delegation. As long as there are no clauses that prohibit showing delegation you should be fine. Seek advice from your employing broker and/or legal counsel if you are ever in question.