In some embodiments, the MPS 100 may send the remote computing devices 106a associated with the VAS 160 only certain information (e.g., only certain metadata) that is needed by the VAS 160 to interpret the voice input and/or conduct a search to resolve one or more aspects of the request. For example, in some aspects, certain metadata may be excluded in the exchanges between the MPS 100 and the VAS 160, such as information that would expressly identify an MCS. Excluding MCS preferences in the metadata may be beneficial as it enables media content to be selected for play back by the MPS 100 (and/or the user) in a way that does not discriminate one MCS over another. Accordingly, although the remote computing devices 106a of the VAS 160 may perform the initial search of the media content request, the MPS 100 maintains control of the parameters of the search and, to some extent, the search results. This may be beneficial as it precludes the VAS 160 from providing search results that could bias the subsequent MCS selection.