diff --git a/cmd/internal-tools/bundle-check/main.go b/cmd/internal-tools/bundle-check/main.go
index b8821c1..be9fb43 100644
--- a/cmd/internal-tools/bundle-check/main.go
+++ b/cmd/internal-tools/bundle-check/main.go
@@ -1,3 +1,4 @@
+// Command bundle-check is a developer tool that bundles a spec file to confirm it compiles.
 package main
 
 import (
diff --git a/cmd/internal-tools/hier-check/main.go b/cmd/internal-tools/hier-check/main.go
index 26089c0..03ddec5 100644
--- a/cmd/internal-tools/hier-check/main.go
+++ b/cmd/internal-tools/hier-check/main.go
@@ -1,3 +1,4 @@
+// Command hier-check is a developer tool that parses a hierarchy dump and reports selector matches.
 package main
 
 import (
diff --git a/cmd/sanderling/main.go b/cmd/sanderling/main.go
index 557ddc1..302d283 100644
--- a/cmd/sanderling/main.go
+++ b/cmd/sanderling/main.go
@@ -1,3 +1,4 @@
+// Command sanderling is the CLI entry point for the property-based UI fuzzer.
 package main
 
 import (