Example implementations relate to determining a functional state of a system under test. For example, a system to determine a functional state of a system under test may include a system controller to execute a functional test of the system under test by invoking a subset of a plurality of functional agents to interact with the system under test. Further, the system may include an agent repository to interact with the system controller and store the plurality of functional agents. Also, the system may include a state module to determine a functional state for the system under test by querying each of the subset of functional agents and comparing aggregated results from the subset of functional agents against defined for the system under test.