diff --git a/contract/batch.go b/contract/batch.go
index 5a52d4e..b4a0fe3 100644
--- a/contract/batch.go
+++ b/contract/batch.go
@@ -23,9 +23,21 @@ type BatchBuilder interface {
 
 	// Build returns a batch of commands.
 	Build() Batch
+
+	// Close closes the batch.
+	Close() error
 }
 
 type Batch interface {
 	// Args returns the arguments of the batch.
 	Args() []string
+
+	// Check checks the validity of the batch.
+	Check(command Command) error
+
+	// Close closes the batch.
+	Close() error
+
+	// MoveFile moves the batch file to the specified path.
+	MoveFile(path string) error
 }