diff --git a/internal/registry/registry.go b/internal/registry/registry.go
index b458e50..957efd4 100644
--- a/internal/registry/registry.go
+++ b/internal/registry/registry.go
@@ -27,7 +27,10 @@ type Registry struct {
 }
 
 func New() *Registry {
-	return &Registry{skills: make(map[string]Skill)}
+	return &Registry{
+		skills: make(map[string]Skill),
+		tools:  make([]ToolDef, 0),
+	}
 }
 
 func (r *Registry) Register(s Skill) {