Note that we have a work item tracking the idea of making chaining multiple stacks together more first class: https://github.com/pulumi/pulumi/issues/109. This is a very common pattern and a little tedious to do by hand -- although the

pulumi stack output

command was designed to make this easier by scripting the CLI -- and we aspire to do better here. Also, we can tell you if you're about to perturb a stack in a way that affects downstream stack dependencies.