diff --git a/hack/actions/gen/main.go b/hack/actions/gen/main.go
index 4930debaee..5ff0227aef 100644
--- a/hack/actions/gen/main.go
+++ b/hack/actions/gen/main.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"bytes"
 	"context"
 	"errors"
 	"io/fs"
@@ -13,63 +14,33 @@ import (
 	"github.com/vdaas/vald/internal/log"
 	"github.com/vdaas/vald/internal/safety"
 	"github.com/vdaas/vald/internal/sync/errgroup"
+	"gopkg.in/yaml.v2"
 )
 
-type (
-	name    string
-	cron    string
-	uses    string
-	target  string
-	secrets string
-
-	branches  []string
-	paths     []string
-	platforms []string
-
-	schedule struct {
-		cron cron
-	}
-
-	push struct {
-		branches branches
-	}
-
-	pull_request struct {
-		paths paths
-	}
-
-	pull_request_target struct {
-		paths paths
-	}
-
-	on struct {
-		schedule            schedule
-		push                push
-		pull_request        pull_request
-		pull_request_target pull_request_target
-	}
-
-	with struct {
-		target    target
-		platforms platforms
-	}
-
-	build struct {
-		uses    uses
-		with    with
-		secrets secrets
-	}
-
-	jobs struct {
-		build build
-	}
-
-	workflow struct {
-		name name
-		on   on
-		jobs jobs
-	}
-)
+type Workflow struct {
+	Name string `yaml:"name"`
+	On   struct {
+		Push struct {
+			Branches []string `yaml:"branches"`
+			Tags     []string `yaml:"tags"`
+		} `yaml:"push"`
+		PullRequest struct {
+			Paths []string `yaml:"paths"`
+		} `yaml:"pull_request"`
+		PullRequestTarget struct {
+			Paths []string `yaml:"paths"`
+		} `yaml:"pull_request_target"`
+	} `yaml:"on"`
+	Jobs struct {
+		Build struct {
+			Uses string `yaml:"uses"`
+			With struct {
+				Target string `yaml:"target"`
+			} `yaml:"with"`
+			Secrets string `yaml:"secrets"`
+		} `yaml:"build"`
+	} `yaml:"jobs"`
+}
 
 type Data struct {
 	AliasImage        bool
@@ -286,6 +257,10 @@ var (
 	}
 )
 
+func generateWorkflowStruct(data Data) Workflow {
+	return Workflow{}
+}
+
 func main() {
 	// この辺の処理は共通？
 	log.Init()
@@ -301,7 +276,7 @@ func main() {
 		syscall.SIGKILL,
 		syscall.SIGTERM)
 	defer cancel()
-	log.Debug(tmpl)
+	log.Debug(tmpl) // workflow型を表示？ここどうしよう？
 
 	maintainer := os.Getenv(maintainerKey)
 	if maintainer == "" {
@@ -349,18 +324,22 @@ func main() {
 				data.Environments = appendM(data.Environments, defaultEnvironments)
 			}
 
-			// ContainerTypeごとの処理 (workflow生成でも重要そう)
+			// TODO: ContainerTypeごとの処理 (workflow生成でも重要そう)
 
 			// ↑ここまでdataの処理 (workflowの生成でもほとんど共通？)
 
 			// ↓ここからファイルの生成
-			// buf := bytes.NewBuffer(make([]byte, 0, len(tmpl)))
 			log.Infof("Generating %s's workflow", name)
-			// workflow.Execute(buf, data)
-			tpl := buf.String()
-			buf.Reset()
-			// template.Must(template.New("workflow").Parse(tpl)).Execute(buf, data)
-			file.OverWriteFile(egctx, file.Join(os.Args[1], "actions", data.PackageDir, "TODO: ファイル名"), buf, fs.ModePerm)
+			workflowStruct := generateWorkflowStruct(data)
+			workflowYaml, err := yaml.Marshal(&workflowStruct)
+			if err != nil {
+				log.Fatalf("error marshaling workflowStruct to YAML: %v", err)
+			}
+
+			// ここの書き方あってる？？
+			buf := bytes.NewBuffer(make([]byte, 0, len(workflowYaml)))
+			buf.Write(workflowYaml)
+			file.OverWriteFile(egctx, file.Join(os.Args[1], ".github/workflows", "TODO: ファイル名"), buf, fs.ModePerm)
 			return nil
 		}))
 	}