It would be great if Tool Containers had an I/O connector icon where you can connect the last tool in that container to and then Cache the container so that it wouldn't have to run every time.
For example, in the diagram below, the output of the Spatial Match would connect to an object such as the "I" that I drew below. We would then be able to cache the output of that container so that all objects in the container wouldn't have to run each time. The "O" would be the cached output and would feed the rest of the workflow.