diff --git a/internal/blocker/interface.go b/internal/blocker/interface.go
index 285b2b1..d55026d 100644
--- a/internal/blocker/interface.go
+++ b/internal/blocker/interface.go
@@ -1,6 +1,19 @@
 package blocker
 
+// BlockerEngine defines the interface for all firewall implementations
 type BlockerEngine interface {
+	// Core operations
 	Ban(ip string) error
 	Unban(ip string) error
+
+	// Lifecycle management
+	Setup() error
+	Close() error
+
+	// Query operations
+	List() ([]string, error)
+
+	// Metadata
+	Name() string
+	IsAvailable() bool
 }