diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..9c45fcb
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,11 @@
+module code.30cm.net/digimon/library-go
+
+go 1.22.3
+
+require github.com/stretchr/testify v1.9.0
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
diff --git a/go.work b/go.work
index e80f250..fd73690 100644
--- a/go.work
+++ b/go.work
@@ -5,4 +5,6 @@ use (
 	./worker_pool
 	./jwt
 	./errs
+	.
+	./utils/invited_code
 )
diff --git a/utils/invited_code/const.go b/utils/invited_code/const.go
index a27e3b7..0be3724 100644
--- a/utils/invited_code/const.go
+++ b/utils/invited_code/const.go
@@ -1,6 +1,9 @@
 package invited_code
 
-const DefaultCodeLen = 8
+const (
+	DefaultCodeLen = 8
+	InitAutoId     = 10000000
+)
 
 var ConvertTable = []string{
 	"O", "D", "W", "X", "Y",