feat(model): Improve error message when model is not configured.

backend/types/errno/agent.go

@@ -35,9 +35,16 @@ const (
 	ErrAgentPublishSingleAgentCode         = 100000010
 	ErrAgentAlreadyBindDatabaseCode        = 100000011
 	ErrAgentExecuteErrCode                 = 100000012
+	ErrAgentNoModelInUseCode               = 100000013
 )
 
 func init() {
+	code.Register(
+		ErrAgentNoModelInUseCode,
+		"there is no llm model in use, please config a model first",
+		code.WithAffectStability(false),
+	)
+
 	code.Register(
 		ErrAgentPublishSingleAgentCode,
 		"publish single agent failed",

backend/types/errno/app.go

@@ -22,12 +22,19 @@ import "github.com/coze-dev/coze-studio/backend/pkg/errorx/code"
 const (
 	ErrAppInvalidParamCode = 101000000
 	ErrAppPermissionCode   = 101000001
-	ErrAppRecordNotFound   = 109000002
+	ErrAppRecordNotFound   = 101000002
+	ErrAppNoModelInUseCode = 101000003
 )
 
 const APPMsgKey = "msg"
 
 func init() {
+	code.Register(
+		ErrAppNoModelInUseCode,
+		"there is no llm model in use, please config a model first",
+		code.WithAffectStability(false),
+	)
+
 	code.Register(
 		ErrAppPermissionCode,
 		"unauthorized access : {msg}",