Getting an Agent Off a Short Story

What magic is this? How does it happen?

Today’s question: I’ve heard of agents contacting people after short stories. How often does that happen? Is it worth trying for? If it does happen, what then — is it like, they sign you on the short story rights? But what other rights does a short story have?

This happened to me! I did have an agent contact me after my first short story was published. A…