diff --git a/InductiveVerification.lean b/InductiveVerification.lean
index d9843f5..c076509 100644
--- a/InductiveVerification.lean
+++ b/InductiveVerification.lean
@@ -1,3 +1,8 @@
 -- This module serves as the root of the `InductiveVerification` library.
 -- Import modules here that should be built as part of the library.
 import InductiveVerification.Basic
+
+inductive Agent
+  | Server : Agent
+  | Friend : Nat → Agent
+  | Spy : Agent