Main Labs Agent tasks are delegated across organizational boundaries. Existing work specifies how agents are identified, discovered, and described, states requirements for cross-domain isolation and authorization, and identifies the absence of a mechanism for expressing capability policy as a gap. This document defines four policy attributes for inter-domain agent delegation, the declarations each attribute carries, and a validity condition on delegation chains that no party establishes by observing the whole chain. Whether independently chosen policies converge is analysed in separate work.