diff --git a/cmd/packetizer/codec.go.tmpl b/cmd/packetizer/codec.go.tmpl
deleted file mode 100644
index c4cb7b3..0000000
--- a/cmd/packetizer/codec.go.tmpl
+++ /dev/null
@@ -1,52 +0,0 @@
-{{- /*gotype: github.com/Tnze/go-mc/cmd/packetizer.PackageInfo*/ -}}
-// Code generated by packetizer.go; DO NOT EDIT.
-
-package {{ .Name }}
-
-import (
-	"io"
-{{- if .Imports }}
-{{ range .Imports }}
-	"{{ . }}"
-{{- end }}
-{{- end }}
-
-	pk "github.com/Tnze/go-mc/net/packet"
-)
-{{ range .Structs }}
-func (c *{{ .Name }}) ReadFrom(r io.Reader) (int64, error) {
-{{- if eq (len .Fields) 0  }}
-	return 0, nil
-{{- else }}
-	var n int64
-	var err error
-	var temp int64
-	{{- range .Fields }}
-	temp, err = {{ generateTarget . }}.ReadFrom(r)
-	n += temp
-	if err != nil {
-		return n, err
-	}
-	{{- end }}
-	return n, err
-{{- end }}
-}
-
-func (c *{{ .Name }}) WriteTo(w io.Writer) (int64, error) {
-{{- if eq (len .Fields) 0  }}
-	return 0, nil
-{{- else }}
-	var n int64
-	var err error
-	var temp int64
-	{{- range .Fields }}
-	temp, err = {{ generateTarget . }}.WriteTo(w)
-		n += temp
-		if err != nil {
-		return n, err
-	}
-	{{- end }}
-	return n, err
-{{- end }}
-}
-{{ end }}
\ No newline at end of file
diff --git a/cmd/packetizer/go.mod b/cmd/packetizer/go.mod
deleted file mode 100644
index 593b52a..0000000
--- a/cmd/packetizer/go.mod
+++ /dev/null
@@ -1,14 +0,0 @@
-module github.com/Tnze/go-mc/cmd/packetizer
-
-go 1.24
-
-require (
-	github.com/Tnze/go-mc v1.20.2
-	golang.org/x/tools v0.34.0
-)
-
-require (
-	github.com/google/uuid v1.3.0 // indirect
-	golang.org/x/mod v0.25.0 // indirect
-	golang.org/x/sync v0.15.0 // indirect
-)
diff --git a/cmd/packetizer/go.sum b/cmd/packetizer/go.sum
deleted file mode 100644
index 45ee9f1..0000000
--- a/cmd/packetizer/go.sum
+++ /dev/null
@@ -1,10 +0,0 @@
-github.com/Tnze/go-mc v1.20.2 h1:arHCE/WxLCxY73C/4ZNLdOymRYtdwoXE05ohB7HVN6Q=
-github.com/Tnze/go-mc v1.20.2/go.mod h1:geoRj2HsXSkB3FJBuhr7wCzXegRlzWsVXd7h7jiJ6aQ=
-github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
-github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
-golang.org/x/mod v0.25.0 h1:n7a+ZbQKQA/Ysbyb0/6IbB1H/X41mKgbhfv7AfG/44w=
-golang.org/x/mod v0.25.0/go.mod h1:IXM97Txy2VM4PJ3gI61r1YEk/gAj6zAHN3AdZt6S9Ww=
-golang.org/x/sync v0.15.0 h1:KWH3jNZsfyT6xfAfKiz6MRNmd46ByHDYaZ7KSkCtdW8=
-golang.org/x/sync v0.15.0/go.mod h1:1dzgHSNfp02xaA81J2MS99Qcpr2w7fw1gpm99rleRqA=
-golang.org/x/tools v0.34.0 h1:qIpSLOxeCYGg9TrcJokLBG4KFA6d795g0xkBkiESGlo=
-golang.org/x/tools v0.34.0/go.mod h1:pAP9OwEaY1CAW3HOmg3hLZC5Z0CCmzjAF2UQMSqNARg=
diff --git a/cmd/packetizer/main.go b/cmd/packetizer/main.go
deleted file mode 100644
index 036f3da..0000000
--- a/cmd/packetizer/main.go
+++ /dev/null
@@ -1,361 +0,0 @@
-package main
-
-import (
-	"bytes"
-	_ "embed"
-	"flag"
-	"fmt"
-	"go/ast"
-	"go/token"
-	"go/types"
-	"os"
-	"path/filepath"
-	"strings"
-	"text/template"
-
-	"github.com/Tnze/go-mc/net/packet"
-	"golang.org/x/tools/go/packages"
-)
-
-type FieldInfo struct {
-	Name            string
-	Type            string
-	NeedConvert     bool
-	ValidField      bool
-	IsSlice         bool
-	IsUnconvertible bool
-	IsFunc          bool
-}
-
-type StructInfo struct {
-	Name    string
-	Package string
-	Fields  []FieldInfo
-	Imports []string
-}
-
-type PackageInfo struct {
-	File       *ast.File
-	Pkg        *packages.Package
-	CommentMap ast.CommentMap
-
-	Name string
-	Path string
-
-	Structs []StructInfo
-	Imports []string
-}
-
-func parseTag(tag string) string {
-	if tag == "" {
-		return ""
-	}
-
-	tag = strings.Trim(tag, "`")
-
-	parts := strings.Split(tag, " ")
-	for _, part := range parts {
-		if strings.HasPrefix(part, "mc:") {
-			mcValue := strings.Trim(part[3:], `"`)
-			return mcValue
-		}
-	}
-
-	return ""
-}
-
-func shouldProcessStruct(commentMap ast.CommentMap, genDecl *ast.GenDecl) bool {
-	if groups, ok := commentMap[genDecl]; ok {
-		for _, cg := range groups {
-			for _, c := range cg.List {
-				content := strings.TrimSpace(strings.TrimPrefix(strings.TrimSpace(c.Text), "//"))
-				if content == "codec:gen" {
-					return true
-				}
-			}
-		}
-	}
-	return false
-}
-
-func analyzeFile(pkgInfo *PackageInfo) {
-	var pkField *types.Interface
-	typ, ok := packetFieldMap["Field"]
-	if ok {
-		pkField = typ.Underlying().(*types.Interface)
-	}
-	for _, decl := range pkgInfo.File.Decls {
-		gen, ok := decl.(*ast.GenDecl)
-		if !ok || gen.Tok != token.TYPE {
-			continue
-		}
-		if !shouldProcessStruct(pkgInfo.CommentMap, gen) {
-			continue
-		}
-
-		for _, spec := range gen.Specs {
-			ts, ok := spec.(*ast.TypeSpec)
-			if !ok {
-				continue
-			}
-
-			st, ok := ts.Type.(*ast.StructType)
-			if !ok {
-				continue
-			}
-
-			structInfo := StructInfo{
-				Name:    ts.Name.Name,
-				Package: pkgInfo.Pkg.Name,
-				Fields:  []FieldInfo{},
-			}
-
-			for _, field := range st.Fields.List {
-				if len(field.Names) == 0 {
-					continue
-				}
-
-				for _, name := range field.Names {
-					fi := FieldInfo{
-						Name: name.Name,
-					}
-
-					mcTag := parseTag(fieldTagValue(field))
-					if mcTag == "-" {
-						continue
-					}
-					obj := pkgInfo.Pkg.TypesInfo.Defs[name]
-					if obj != nil {
-						t := obj.Type()
-
-						if s, ok := t.(*types.Slice); ok {
-							fi.IsSlice = true
-							t = s.Elem()
-							if mcTag != "" {
-								if fieldType, ok := packetFieldMap[mcTag]; ok {
-									if _, ok := fieldType.Underlying().(*types.Slice); ok {
-										fi.IsSlice = false
-										fi.NeedConvert = true
-										t = fieldType
-									}
-								}
-							}
-						}
-
-						if b, ok := t.(*types.Basic); ok {
-							basicType := getBasicType(b.Kind())
-							if basicType != nil {
-								fi.NeedConvert = true
-								t = basicType
-							}
-						}
-
-						typeString := types.TypeString(t, func(p *types.Package) string {
-							return ""
-						})
-						fi.Type = typeString
-
-						if mcTag != "" {
-							if fieldType, ok := packetFieldMap[mcTag]; ok && types.ConvertibleTo(t, fieldType) {
-								fi.NeedConvert = true
-								fi.Type = mcTag
-							}
-							if fieldType, ok := packetFieldMap[mcTag]; ok {
-								if sig, ok := fieldType.Underlying().(*types.Signature); ok {
-									if sig.Results().Len() == 1 {
-										fi.IsFunc = true
-										fi.Type = mcTag
-										t = sig.Results().At(0).Type()
-									}
-								}
-							}
-						}
-
-						{
-							if types.Implements(t, pkField) || types.Implements(types.NewPointer(t), pkField) {
-								fi.ValidField = true
-							}
-						}
-					}
-
-					structInfo.Fields = append(structInfo.Fields, fi)
-				}
-			}
-
-			pkgInfo.Structs = append(pkgInfo.Structs, structInfo)
-		}
-	}
-}
-
-func getBasicType(kind types.BasicKind) types.Type {
-	switch kind {
-	case types.Bool:
-		return packetFieldMap["Boolean"]
-	case types.Int:
-		return packetFieldMap["Int"]
-	case types.Int8:
-		return packetFieldMap["Byte"]
-	case types.Int16:
-		return packetFieldMap["Short"]
-	case types.Int32:
-		return packetFieldMap["Int"]
-	case types.Int64:
-		return packetFieldMap["Long"]
-	case types.Uint8:
-		return packetFieldMap["UnsignedByte"]
-	case types.Uint16:
-		return packetFieldMap["UnsignedShort"]
-	case types.Float32:
-		return packetFieldMap["Float"]
-	case types.Float64:
-		return packetFieldMap["Double"]
-	case types.String:
-		return packetFieldMap["String"]
-	case types.UntypedBool:
-		return packetFieldMap["Boolean"]
-	case types.UntypedInt:
-		return packetFieldMap["Int"]
-	case types.UntypedFloat:
-		return packetFieldMap["Double"]
-	case types.UntypedString:
-		return packetFieldMap["String"]
-	default:
-		return nil
-	}
-}
-
-func fieldTagValue(f *ast.Field) string {
-	if f.Tag != nil {
-		return f.Tag.Value
-	}
-	return ""
-}
-
-func generateFieldTarget(field FieldInfo) string {
-	pattern := fmt.Sprintf("(&c.%s)", field.Name)
-	if field.IsSlice {
-		pattern = "pk.Array" + pattern
-	} else if field.IsFunc {
-		pattern = "pk." + field.Type + pattern
-	} else if field.NeedConvert {
-		pattern = "(*pk." + field.Type + ")" + pattern
-	}
-	return pattern
-}
-
-// 按包分組
-func groupByPackage(packages []*PackageInfo) map[string]*PackageInfo {
-	grouped := make(map[string]*PackageInfo)
-
-	for _, pkg := range packages {
-		key := filepath.Dir(pkg.Path)
-		if existing, ok := grouped[key]; ok {
-			existing.Structs = append(existing.Structs, pkg.Structs...)
-			for _, imp := range pkg.Imports {
-				found := false
-				for _, existingImp := range existing.Imports {
-					if existingImp == imp {
-						found = true
-						break
-					}
-				}
-				if !found {
-					existing.Imports = append(existing.Imports, imp)
-				}
-			}
-		} else {
-			grouped[key] = pkg
-		}
-	}
-
-	return grouped
-}
-
-var packetFieldMap = map[string]types.Type{}
-
-//go:embed codec.go.tmpl
-var codecTemplate string
-
-var tmpl *template.Template
-
-func init() {
-	_ = packet.Field(nil)
-
-	funcMap := template.FuncMap{
-		"generateTarget": generateFieldTarget,
-	}
-
-	tmpl = template.Must(template.New("codecs").Funcs(funcMap).Parse(codecTemplate))
-}
-
-func main() {
-	dir := flag.String("dir", ".", "input directory to search for codec:gen tags")
-	flag.Parse()
-
-	cfg := &packages.Config{
-		Mode: packages.NeedName | packages.NeedSyntax | packages.NeedTypes | packages.NeedTypesInfo | packages.NeedFiles | packages.NeedDeps,
-		Fset: token.NewFileSet(),
-		Dir:  *dir,
-		Env:  os.Environ(),
-	}
-
-	pkgs, err := packages.Load(cfg, "github.com/Tnze/go-mc/net/packet", "./...")
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "Error: failed to load packet package: %v\n", err)
-		os.Exit(1)
-	}
-	for _, pkg := range pkgs {
-		if pkg.PkgPath == "github.com/Tnze/go-mc/net/packet" {
-			scope := pkg.Types.Scope()
-			for _, name := range scope.Names() {
-				packetFieldMap[name] = scope.Lookup(name).Type()
-			}
-			break
-		}
-	}
-
-	var infos []*PackageInfo
-	for _, pkg := range pkgs {
-		if pkg.PkgPath == "github.com/Tnze/go-mc/net/packet" {
-			continue
-		}
-		for _, file := range pkg.Syntax {
-			pf := cfg.Fset.Position(file.Pos()).Filename
-			if strings.HasSuffix(pf, "codecs.go") {
-				continue
-			}
-
-			info := &PackageInfo{File: file, Pkg: pkg, CommentMap: ast.NewCommentMap(cfg.Fset, file, file.Comments), Name: pkg.Name, Path: pf}
-			analyzeFile(info)
-			if info.Structs == nil || len(info.Structs) == 0 {
-				continue
-			}
-			infos = append(infos, info)
-		}
-	}
-
-	if len(infos) == 0 {
-		fmt.Println("No structs found with // codec:gen. Nothing to generate.")
-		return
-	}
-
-	grouped := groupByPackage(infos)
-	fmt.Printf("Processing %d package groups...\n", len(grouped))
-
-	for dirPath, pkgInfo := range grouped {
-		var buf bytes.Buffer
-		if err := tmpl.Execute(&buf, pkgInfo); err != nil {
-			fmt.Fprintf(os.Stderr, "Template execution error: %v\n", err)
-			continue
-		}
-
-		out := filepath.Join(dirPath, "codecs.go")
-		if err := os.WriteFile(out, buf.Bytes(), 0644); err != nil {
-			fmt.Fprintf(os.Stderr, "Error writing %s: %v\n", out, err)
-			continue
-		}
-		fmt.Printf("Generated %s\n", out)
-	}
-
-	fmt.Println("Code generation complete.")
-}