Auto-invocation
Auto-invocation is when the right skill fires by itself at the right moment, driven by a FLOW.md router and a hook, instead of you invoking it by name. It is the difference between a skill being installed and a skill actually getting used.
Every skill directory ends at the install command. Auto-invocation is what happens after: the mechanism that makes an installed skill fire on the prompts where it belongs.
Flowy badges the listings that ship this mechanism as Auto-invoked.