I have a plan that builds a library and publishes the binary as a shared artifact. I have several plans that each build an application that uses that library via Artifact Download task.

When the libraries are updated, I would like this to automatically trigger the application plans so they rebuild against the new version of the library. 

Currently the only way to achieve this is to add each applications as a "child plan" in the library plan. This is not ideal because it requires the library plan to know about every one of it's consumers. This is especially a problem when the application developers may not have permission to edit the library plan. Instead, a "consumer depends-on producer" link set in the consumers would be much better.

It would be nice to have a trigger option that rebuilds a plan following any successful rebuild of a plan from which it had previously downloaded an artifact. 

This should include a plan branch that downloaded an artifact from another plan branch.