diff --git a/.gitea/workflows/build-windows-exe.yml b/.gitea/workflows/build-windows-exe.yml
index f093bda..09a2afa 100644
--- a/.gitea/workflows/build-windows-exe.yml
+++ b/.gitea/workflows/build-windows-exe.yml
@@ -37,6 +37,7 @@ jobs:
           BUILD_TIME="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
           GO111MODULE=on GOOS=windows GOARCH=amd64 CGO_ENABLED=0 go build -ldflags "-H windowsgui -X vrc_osc_go/internal/buildinfo.Version=${VERSION} -X vrc_osc_go/internal/buildinfo.BuildTime=${BUILD_TIME}" -o dist/vrc_osc.exe ./cmd/vrc_osc
           GO111MODULE=on GOOS=windows GOARCH=amd64 CGO_ENABLED=0 go build -ldflags "-H windowsgui -X vrc_osc_go/internal/buildinfo.Version=${VERSION} -X vrc_osc_go/internal/buildinfo.BuildTime=${BUILD_TIME}" -o dist/vrc_osc_launcher.exe ./cmd/vrc_osc_launcher
+          GO111MODULE=on GOOS=windows GOARCH=amd64 CGO_ENABLED=0 go build -ldflags "-H windowsgui -X vrc_osc_go/internal/buildinfo.Version=${VERSION} -X vrc_osc_go/internal/buildinfo.BuildTime=${BUILD_TIME}" -o dist/vrc_osc_gui.exe ./cmd/vrc_osc_gui
           GO111MODULE=on GOOS=windows GOARCH=amd64 CGO_ENABLED=0 go build -ldflags "-X vrc_osc_go/internal/buildinfo.Version=${VERSION} -X vrc_osc_go/internal/buildinfo.BuildTime=${BUILD_TIME}" -o dist/vrwt_tool.exe ./cmd/vrwt_tool
 
       - name: Package executables
@@ -46,7 +47,7 @@ jobs:
           cp config/config.example.toml dist/config.example.toml
           cp config/secrets.example.toml dist/secrets.example.toml
           cp config/guests.example.txt dist/guests.example.txt
-          (cd dist && zip -r vrc_osc-windows.zip vrc_osc.exe vrc_osc_launcher.exe vrwt_tool.exe config.example.toml secrets.example.toml guests.example.txt)
+          (cd dist && zip -r vrc_osc-windows.zip vrc_osc.exe vrc_osc_launcher.exe vrc_osc_gui.exe vrwt_tool.exe config.example.toml secrets.example.toml guests.example.txt)
 
       - name: Create Release
         env:
diff --git a/cmd/vrc_osc/main.go b/cmd/vrc_osc/main.go
index fed460f..67bca30 100644
--- a/cmd/vrc_osc/main.go
+++ b/cmd/vrc_osc/main.go
@@ -4,18 +4,39 @@ import (
 	"flag"
 	"log"
 	"os"
+	"os/exec"
+	"path/filepath"
 
 	"vrc_osc_go/internal/app"
 )
 
 func main() {
 	var configPath string
+	var mode string
+	var noGUI bool
 	flag.StringVar(&configPath, "config", "config/config.toml", "path to config.toml")
+	flag.StringVar(&mode, "mode", "", "generate-json or extract-log")
+	flag.BoolVar(&noGUI, "no-gui", false, "do not launch the GUI companion")
 	flag.Parse()
 
-	if err := app.Run(configPath); err != nil {
+	if mode == "" && !noGUI {
+		launchGUI()
+	}
+
+	if err := app.Run(configPath, mode); err != nil {
 		log.SetOutput(os.Stderr)
 		log.Fatalf("vrc_osc_go: %v", err)
 	}
 }
 
+func launchGUI() {
+	exe, err := os.Executable()
+	if err != nil {
+		return
+	}
+	gui := filepath.Join(filepath.Dir(exe), "vrc_osc_gui.exe")
+	if _, err := os.Stat(gui); err != nil {
+		return
+	}
+	_ = exec.Command(gui).Start()
+}
diff --git a/cmd/vrc_osc_gui/main.go b/cmd/vrc_osc_gui/main.go
new file mode 100644
index 0000000..fbe31c2
--- /dev/null
+++ b/cmd/vrc_osc_gui/main.go
@@ -0,0 +1,14 @@
+//go:build windows
+
+package main
+
+import (
+	"log"
+
+	"vrc_osc_go/internal/app"
+)
+
+func main() {
+	_ = app.AppendRuntimeLog("GUI", "starting vrc_osc_gui.exe")
+	log.Fatal(runNativeGUI())
+}
diff --git a/cmd/vrc_osc_gui/tray_windows.go b/cmd/vrc_osc_gui/tray_windows.go
new file mode 100644
index 0000000..6218cbe
--- /dev/null
+++ b/cmd/vrc_osc_gui/tray_windows.go
@@ -0,0 +1,216 @@
+//go:build windows
+
+package main
+
+import (
+	"fmt"
+	"log"
+	"os/exec"
+	"syscall"
+	"unsafe"
+)
+
+const (
+	wmUser      = 0x0400
+	wmTray      = wmUser + 1
+	wmCommand   = 0x0111
+	wmDestroy    = 0x0002
+	wmClose      = 0x0010
+	wmRButtonUp  = 0x0205
+	wmLButtonUp  = 0x0202
+	wmCreate     = 0x0001
+	wmQuit       = 0x0012
+	niAdd        = 0x00000000
+	niModify     = 0x00000001
+	niDelete     = 0x00000002
+	nifMessage   = 0x00000001
+	nifIcon      = 0x00000002
+	nifTip       = 0x00000004
+	nifInfo      = 0x00000010
+	nimPopup     = 0x00000000
+	miString     = 0x00000000
+	miSeparator  = 0x00000800
+	miDefault    = 0x00001000
+	swHide       = 0
+	idOpen       = 1001
+	idExit       = 1002
+	maxTip       = 128
+	maxClassName  = 64
+)
+
+type trayApp struct {
+	uiURL string
+	open  func()
+}
+
+func newTray(uiURL string, open func()) *trayApp {
+	return &trayApp{uiURL: uiURL, open: open}
+}
+
+func (t *trayApp) Run() error {
+	return runTray(t.uiURL, t.open)
+}
+
+func openBrowser(url string) {
+	_ = exec.Command("rundll32", "url.dll,FileProtocolHandler", url).Start()
+}
+
+func runTray(uiURL string, open func()) error {
+	user32 := syscall.NewLazyDLL("user32.dll")
+	shell32 := syscall.NewLazyDLL("shell32.dll")
+	kernel32 := syscall.NewLazyDLL("kernel32.dll")
+
+	registerClass := user32.NewProc("RegisterClassW")
+	createWindowEx := user32.NewProc("CreateWindowExW")
+	defWindowProc := user32.NewProc("DefWindowProcW")
+	getMessage := user32.NewProc("GetMessageW")
+	translateMessage := user32.NewProc("TranslateMessage")
+	dispatchMessage := user32.NewProc("DispatchMessageW")
+	postQuitMessage := user32.NewProc("PostQuitMessage")
+	createPopupMenu := user32.NewProc("CreatePopupMenu")
+	appendMenu := user32.NewProc("AppendMenuW")
+	setForegroundWindow := user32.NewProc("SetForegroundWindow")
+	trackPopupMenu := user32.NewProc("TrackPopupMenu")
+	showWindow := user32.NewProc("ShowWindow")
+	loadIcon := user32.NewProc("LoadIconW")
+	shellNotifyIcon := shell32.NewProc("Shell_NotifyIconW")
+	getModuleHandle := kernel32.NewProc("GetModuleHandleW")
+
+	type wndClassEx struct {
+		cbSize        uint32
+		style         uint32
+		lpfnWndProc   uintptr
+		cbClsExtra    int32
+		cbWndExtra    int32
+		hInstance     uintptr
+		hIcon         uintptr
+		hCursor       uintptr
+		hbrBackground uintptr
+		lpszMenuName  *uint16
+		lpszClassName *uint16
+		hIconSm       uintptr
+	}
+	type point struct{ X, Y int32 }
+	type msg struct {
+		hwnd    uintptr
+		message uint32
+		wParam  uintptr
+		lParam  uintptr
+		time    uint32
+		pt      point
+	}
+	type notifyIconData struct {
+		cbSize           uint32
+		hWnd             uintptr
+		uID              uint32
+		uFlags           uint32
+		uCallbackMessage uint32
+		hIcon            uintptr
+		szTip            [maxTip]uint16
+		dwState          uint32
+		dwStateMask      uint32
+		szInfo           [256]uint16
+		uTimeoutVersion  uint32
+		szInfoTitle      [64]uint16
+		dwInfoFlags      uint32
+		guidItem         [16]byte
+		hBalloonIcon     uintptr
+	}
+
+	className, _ := syscall.UTF16PtrFromString("VRC_OSC_TRAY")
+	windowTitle, _ := syscall.UTF16PtrFromString("VRC OSC Tray")
+	icon, _, _ := loadIcon.Call(0, 32512) // IDI_APPLICATION
+
+	var hwnd uintptr
+	var menu uintptr
+	var nid notifyIconData
+
+	wndProc := syscall.NewCallback(func(hwnd uintptr, msg uint32, wParam, lParam uintptr) uintptr {
+		switch msg {
+		case wmCreate:
+			return 0
+		case wmTray:
+			switch lParam {
+			case wmLButtonUp:
+				if open != nil {
+					open()
+				}
+			case wmRButtonUp:
+				if menu == 0 {
+					m, _, _ := createPopupMenu.Call()
+					menu = m
+					openText, _ := syscall.UTF16PtrFromString("Open UI")
+					exitText, _ := syscall.UTF16PtrFromString("Exit")
+					appendMenu.Call(menu, miString|miDefault, idOpen, uintptr(unsafe.Pointer(openText)))
+					appendMenu.Call(menu, miString, idExit, uintptr(unsafe.Pointer(exitText)))
+				}
+				setForegroundWindow.Call(hwnd)
+				var p point
+				user32.NewProc("GetCursorPos").Call(uintptr(unsafe.Pointer(&p)))
+				trackPopupMenu.Call(menu, nimPopup, uintptr(p.X), uintptr(p.Y), 0, hwnd, 0)
+			}
+			return 0
+		case wmCommand:
+			switch uint16(wParam & 0xffff) {
+			case idOpen:
+				if open != nil {
+					open()
+				}
+			case idExit:
+				user32.NewProc("DestroyWindow").Call(hwnd)
+			}
+			return 0
+		case wmDestroy:
+			nid.cbSize = uint32(unsafe.Sizeof(nid))
+			nid.hWnd = hwnd
+			nid.uID = 1
+			shellNotifyIcon.Call(niDelete, uintptr(unsafe.Pointer(&nid)))
+			postQuitMessage.Call(0)
+			return 0
+		}
+		ret, _, _ := defWindowProc.Call(hwnd, uintptr(msg), wParam, lParam)
+		return ret
+	})
+
+	hInstance, _, _ := getModuleHandle.Call(0)
+	_, _, regErr := registerClass.Call(uintptr(unsafe.Pointer(&wndClassEx{
+		cbSize:        uint32(unsafe.Sizeof(wndClassEx{})),
+		lpfnWndProc:   wndProc,
+		hInstance:     hInstance,
+		hIcon:         icon,
+		lpszClassName: className,
+	})))
+	if regErr != nil {
+		return fmt.Errorf("RegisterClassW failed: %v", regErr)
+	}
+
+	hwnd, _, err := createWindowEx.Call(0, uintptr(unsafe.Pointer(className)), uintptr(unsafe.Pointer(windowTitle)), 0, 0, 0, 0, 0, 0, 0, hInstance, 0)
+	if hwnd == 0 {
+		return fmt.Errorf("CreateWindowExW failed: %v", err)
+	}
+	showWindow.Call(hwnd, swHide)
+
+	nid.cbSize = uint32(unsafe.Sizeof(nid))
+	nid.hWnd = hwnd
+	nid.uID = 1
+	nid.uFlags = nifMessage | nifIcon | nifTip
+	nid.uCallbackMessage = wmTray
+	nid.hIcon = icon
+	tip := syscall.StringToUTF16("VRC OSC")
+	copy(nid.szTip[:], tip)
+	if ok, _, _ := shellNotifyIcon.Call(niAdd, uintptr(unsafe.Pointer(&nid))); ok == 0 {
+		return fmt.Errorf("Shell_NotifyIconW add failed")
+	}
+	log.Printf("tray started")
+
+	var m msg
+	for {
+		r, _, _ := getMessage.Call(uintptr(unsafe.Pointer(&m)), 0, 0, 0)
+		if int32(r) <= 0 {
+			break
+		}
+		translateMessage.Call(uintptr(unsafe.Pointer(&m)))
+		dispatchMessage.Call(uintptr(unsafe.Pointer(&m)))
+	}
+	return nil
+}
diff --git a/cmd/vrc_osc_gui/window_windows.go b/cmd/vrc_osc_gui/window_windows.go
new file mode 100644
index 0000000..edc1a4c
--- /dev/null
+++ b/cmd/vrc_osc_gui/window_windows.go
@@ -0,0 +1,531 @@
+//go:build windows
+
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"regexp"
+	"sort"
+	"strconv"
+	"strings"
+	"syscall"
+	"time"
+	"unsafe"
+
+	"vrc_osc_go/internal/app"
+)
+
+const (
+	wsOverlappedWindow = 0x00CF0000
+	wsVisible          = 0x10000000
+	wsChild            = 0x40000000
+	wsBorder           = 0x00800000
+	esMultiline        = 0x0004
+	esReadonly         = 0x0800
+	esAutovscroll      = 0x0040
+	esAutohscroll      = 0x0080
+	wmCreateGUI        = 0x0001
+	wmDestroyGUI       = 0x0002
+	wmTimerGUI         = 0x0113
+	wmCommandGUI       = 0x0111
+	idStatus           = 2001
+	idLog              = 2002
+	timerRefresh       = 1
+)
+
+var joinLeaveLinePattern = regexp.MustCompile(`^\[(\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2})\]\s+\[(join|leave)\]\s+(.+?)\s+\((\d+)\)$`)
+var runtimeTimePattern = regexp.MustCompile(`^\[(\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2})\]`)
+
+type guiApp struct {
+	hwnd      uintptr
+	leftHwnd  uintptr
+	rightHwnd uintptr
+	tabJoin   uintptr
+	tabDiscord uintptr
+	tabTranslate uintptr
+	activeTab string
+	lastInstanceCount int
+}
+
+type userState struct {
+	Name     string
+	Present  bool
+	LastJoin time.Time
+	LastLeave time.Time
+}
+
+func runtimeDir() string {
+	exe, err := os.Executable()
+	if err != nil {
+		return "runtime"
+	}
+	return filepath.Join(filepath.Dir(exe), "runtime")
+}
+
+func guiLog(text string) {
+	_ = app.AppendRuntimeLog("GUI", text)
+}
+
+func runNativeGUI() error {
+	user32 := syscall.NewLazyDLL("user32.dll")
+	kernel32 := syscall.NewLazyDLL("kernel32.dll")
+	registerClass := user32.NewProc("RegisterClassW")
+	createWindowEx := user32.NewProc("CreateWindowExW")
+	defWindowProc := user32.NewProc("DefWindowProcW")
+	showWindow := user32.NewProc("ShowWindow")
+	updateWindow := user32.NewProc("UpdateWindow")
+	getMessage := user32.NewProc("GetMessageW")
+	translateMessage := user32.NewProc("TranslateMessage")
+	dispatchMessage := user32.NewProc("DispatchMessageW")
+	postQuitMessage := user32.NewProc("PostQuitMessage")
+	setTimer := user32.NewProc("SetTimer")
+	loadCursor := user32.NewProc("LoadCursorW")
+	setWindowText := user32.NewProc("SetWindowTextW")
+	getModuleHandle := kernel32.NewProc("GetModuleHandleW")
+	loadIcon := user32.NewProc("LoadIconW")
+
+	type wndClass struct {
+		style         uint32
+		lpfnWndProc   uintptr
+		cbClsExtra    int32
+		cbWndExtra    int32
+		hInstance     uintptr
+		hIcon         uintptr
+		hCursor       uintptr
+		hbrBackground uintptr
+		lpszMenuName  *uint16
+		lpszClassName *uint16
+	}
+	type msg struct {
+		hwnd    uintptr
+		message uint32
+		wParam  uintptr
+		lParam  uintptr
+		time    uint32
+		pt      struct{ X, Y int32 }
+	}
+
+	hInstance, _, _ := getModuleHandle.Call(0)
+	className, _ := syscall.UTF16PtrFromString("VRC_OSC_NATIVE_GUI")
+	title, _ := syscall.UTF16PtrFromString("VRC OSC")
+	cursor, _, _ := loadCursor.Call(0, 32512)
+	icon, _, _ := loadIcon.Call(0, 32512)
+	guiLog("stage=prepare window")
+
+	var app guiApp
+	wndProc := syscall.NewCallback(func(hwnd uintptr, message uint32, wParam, lParam uintptr) uintptr {
+		switch message {
+		case wmCreateGUI:
+			buttonClass, _ := syscall.UTF16PtrFromString("BUTTON")
+			leftClass, _ := syscall.UTF16PtrFromString("EDIT")
+			rightClass, _ := syscall.UTF16PtrFromString("EDIT")
+			leftTitle, _ := syscall.UTF16PtrFromString("")
+			rightTitle, _ := syscall.UTF16PtrFromString("")
+			joinTitle, _ := syscall.UTF16PtrFromString("Join Log")
+			discordTitle, _ := syscall.UTF16PtrFromString("Discord")
+			translateTitle, _ := syscall.UTF16PtrFromString("Translate")
+			app.tabJoin, _, _ = createWindowEx.Call(0, uintptr(unsafe.Pointer(buttonClass)), uintptr(unsafe.Pointer(joinTitle)), wsVisible|wsChild, 370, 20, 90, 28, hwnd, 3001, hInstance, 0)
+			app.tabDiscord, _, _ = createWindowEx.Call(0, uintptr(unsafe.Pointer(buttonClass)), uintptr(unsafe.Pointer(discordTitle)), wsVisible|wsChild, 470, 20, 90, 28, hwnd, 3002, hInstance, 0)
+			app.tabTranslate, _, _ = createWindowEx.Call(0, uintptr(unsafe.Pointer(buttonClass)), uintptr(unsafe.Pointer(translateTitle)), wsVisible|wsChild, 570, 20, 90, 28, hwnd, 3003, hInstance, 0)
+			app.leftHwnd, _, _ = createWindowEx.Call(0, uintptr(unsafe.Pointer(leftClass)), uintptr(unsafe.Pointer(leftTitle)), wsVisible|wsChild|wsBorder|esMultiline|esReadonly|esAutovscroll|esAutohscroll, 20, 20, 330, 300, hwnd, idStatus, hInstance, 0)
+			app.rightHwnd, _, _ = createWindowEx.Call(0, uintptr(unsafe.Pointer(rightClass)), uintptr(unsafe.Pointer(rightTitle)), wsVisible|wsChild|wsBorder|esMultiline|esReadonly|esAutovscroll|esAutohscroll, 370, 60, 330, 260, hwnd, idLog, hInstance, 0)
+			app.activeTab = "join"
+			setTimer.Call(hwnd, timerRefresh, 2000, 0)
+			refreshGUI(setWindowText, &app)
+			return 0
+		case wmCommandGUI:
+			switch uint16(wParam & 0xffff) {
+			case 3001:
+				app.activeTab = "join"
+			case 3002:
+				app.activeTab = "discord"
+			case 3003:
+				app.activeTab = "translate"
+			}
+			refreshGUI(setWindowText, &app)
+			return 0
+		case wmTimerGUI:
+			refreshGUI(setWindowText, &app)
+			return 0
+		case wmDestroyGUI:
+			postQuitMessage.Call(0)
+			return 0
+		}
+		ret, _, _ := defWindowProc.Call(hwnd, uintptr(message), wParam, lParam)
+		return ret
+	})
+
+	guiLog("stage=register class")
+	atom, _, regErr := registerClass.Call(uintptr(unsafe.Pointer(&wndClass{
+		style:         0,
+		lpfnWndProc:   wndProc,
+		hInstance:     hInstance,
+		hIcon:         icon,
+		hCursor:       cursor,
+		hbrBackground: 6,
+		lpszClassName: className,
+	})))
+	if atom == 0 {
+		guiLog(fmt.Sprintf("stage=register class failed err=%v", regErr))
+		return fmt.Errorf("register class: %v", regErr)
+	}
+
+	guiLog("stage=create window")
+	app.hwnd, _, _ = createWindowEx.Call(0, uintptr(unsafe.Pointer(className)), uintptr(unsafe.Pointer(title)), wsOverlappedWindow, 200, 120, 760, 380, 0, 0, hInstance, 0)
+	if app.hwnd == 0 {
+		guiLog("stage=create window failed")
+		return fmt.Errorf("create window failed")
+	}
+
+	guiLog("stage=show window")
+	showWindow.Call(app.hwnd, 5)
+	updateWindow.Call(app.hwnd)
+	guiLog("stage=message loop")
+
+	var m msg
+	for {
+		r, _, _ := getMessage.Call(uintptr(unsafe.Pointer(&m)), 0, 0, 0)
+		if int32(r) <= 0 {
+			break
+		}
+		translateMessage.Call(uintptr(unsafe.Pointer(&m)))
+		dispatchMessage.Call(uintptr(unsafe.Pointer(&m)))
+	}
+	return nil
+}
+
+func refreshGUI(setWindowText *syscall.LazyProc, app *guiApp) {
+	current, instanceCount := currentUsersFromJoinLeave()
+	if instanceCount == 0 && app.lastInstanceCount > 0 {
+		instanceCount = app.lastInstanceCount
+	}
+	if instanceCount > 0 {
+		app.lastInstanceCount = instanceCount
+	}
+	if app.leftHwnd != 0 {
+		t, _ := syscall.UTF16PtrFromString(formatGuestPane("Join Log", current))
+		setWindowText.Call(app.leftHwnd, uintptr(unsafe.Pointer(t)))
+	}
+	if app.rightHwnd != 0 {
+		t, _ := syscall.UTF16PtrFromString(formatRightPane(app.activeTab, readRuntimeSnapshot(), currentWorldLabel(), instanceCount))
+		setWindowText.Call(app.rightHwnd, uintptr(unsafe.Pointer(t)))
+	}
+}
+
+func currentUsersFromJoinLeave() ([]userState, int) {
+	since := currentWorldStartTime()
+	users := map[string]*userState{}
+	lastLoggedCount := 0
+	for _, s := range readGuestSnapshot() {
+		if !s.Present {
+			continue
+		}
+		cp := s
+		users[s.Name] = &userState{
+			Name:     s.Name,
+			Present:  true,
+			LastJoin: cp.LastJoin,
+		}
+	}
+
+	p := filepath.Join(runtimeDir(), "join_leave.log")
+	b, err := os.ReadFile(p)
+	if err != nil {
+		out := make([]userState, 0, len(users))
+		for _, u := range users {
+			out = append(out, *u)
+		}
+		sort.Slice(out, func(i, j int) bool {
+			if out[i].Present != out[j].Present {
+				return out[i].Present
+			}
+			return strings.ToLower(out[i].Name) < strings.ToLower(out[j].Name)
+		})
+		return out, countPresent(out)
+	}
+
+	for _, raw := range strings.Split(string(b), "\n") {
+		line := strings.TrimSpace(raw)
+		if line == "" {
+			continue
+		}
+		if c := parseJoinLeaveCount(line); c > 0 {
+			lastLoggedCount = c
+		}
+		at, kind, name := parseJoinLeaveLine(line)
+		if name == "" {
+			continue
+		}
+		if !since.IsZero() && at.Before(since) {
+			continue
+		}
+		u := users[name]
+		if u == nil {
+			u = &userState{Name: name}
+			users[name] = u
+		}
+		switch kind {
+		case "join":
+			u.Present = true
+			if at.After(u.LastJoin) {
+				u.LastJoin = at
+			}
+		case "leave":
+			u.Present = false
+			if at.After(u.LastLeave) {
+				u.LastLeave = at
+			}
+		}
+	}
+
+	// Keep any snapshot-marked present users that the join/leave delta can't rebuild.
+	for _, snap := range readGuestSnapshot() {
+		if !snap.Present {
+			continue
+		}
+		u := users[snap.Name]
+		if u == nil {
+			users[snap.Name] = &userState{
+				Name:     snap.Name,
+				Present:  true,
+				LastJoin: snap.LastJoin,
+			}
+			continue
+		}
+		if !u.Present {
+			u.Present = true
+			if u.LastJoin.IsZero() {
+				u.LastJoin = snap.LastJoin
+			}
+		}
+	}
+
+	out := make([]userState, 0, len(users))
+	for _, u := range users {
+		out = append(out, *u)
+	}
+	sort.Slice(out, func(i, j int) bool {
+		if out[i].Present != out[j].Present {
+			return out[i].Present
+		}
+		return strings.ToLower(out[i].Name) < strings.ToLower(out[j].Name)
+	})
+	present := countPresent(out)
+	if lastLoggedCount > present {
+		present = lastLoggedCount
+	}
+	return out, present
+}
+
+func readGuestSnapshot() []app.GuestStatus {
+	p := filepath.Join(runtimeDir(), "guest_snapshot.json")
+	b, err := os.ReadFile(p)
+	if err != nil {
+		return nil
+	}
+	var out []app.GuestStatus
+	if err := json.Unmarshal(b, &out); err != nil {
+		return nil
+	}
+	return out
+}
+
+func formatGuestPane(title string, items []userState) string {
+	var b strings.Builder
+	b.WriteString(title)
+	b.WriteString("\r\n")
+	b.WriteString(strings.Repeat("=", len(title)))
+	b.WriteString("\r\n")
+	if len(items) == 0 {
+		b.WriteString("Current in room: 0")
+		b.WriteString("\r\n")
+		b.WriteString("(none)")
+		return b.String()
+	}
+	b.WriteString("Current in room: ")
+	b.WriteString(strconv.Itoa(countPresent(items)))
+	b.WriteString("\r\n\r\n")
+	for _, item := range items {
+		b.WriteString("・ ")
+		b.WriteString(item.Name)
+		if item.Present {
+			b.WriteString(" [present]")
+		} else {
+			b.WriteString(" [gray]")
+			if !item.LastLeave.IsZero() {
+				b.WriteString(" ")
+				b.WriteString(timeAgo(item.LastLeave))
+			}
+		}
+		b.WriteString("\r\n")
+	}
+	return strings.TrimRight(b.String(), "\r\n")
+}
+
+func formatRightPane(tab string, state map[string]any, worldLabel string, currentUsers int) string {
+	var b strings.Builder
+	switch tab {
+	case "discord":
+		b.WriteString("Discord")
+	case "translate":
+		b.WriteString("Translate")
+	default:
+		b.WriteString("Current World")
+	}
+	b.WriteString("\r\n")
+	titleLine := "Current World"
+	switch tab {
+	case "discord":
+		titleLine = "Discord"
+	case "translate":
+		titleLine = "Translate"
+	}
+	b.WriteString(strings.Repeat("=", len(titleLine)))
+	b.WriteString("\r\n")
+	discordMuted, _ := state["discord_muted"].(bool)
+	ocr, _ := state["ocr"].(string)
+	translate, _ := state["translate"].(string)
+	switch tab {
+	case "discord":
+		b.WriteString("Muted: ")
+		b.WriteString(fmt.Sprintf("%v", discordMuted))
+		b.WriteString("\r\nWorld: ")
+		b.WriteString(worldLabel)
+		b.WriteString("\r\nUsers: ")
+		b.WriteString(fmt.Sprintf("%d", currentUsers))
+	case "translate":
+		b.WriteString("Translate: ")
+		b.WriteString(translate)
+		b.WriteString("\r\nOCR: ")
+		b.WriteString(ocr)
+		b.WriteString("\r\nWorld: ")
+		b.WriteString(worldLabel)
+	default:
+		b.WriteString("World: ")
+		b.WriteString(worldLabel)
+		b.WriteString("\r\nUsers: ")
+		b.WriteString(fmt.Sprintf("%d", currentUsers))
+		b.WriteString("\r\nDiscord muted: ")
+		b.WriteString(fmt.Sprintf("%v", discordMuted))
+		b.WriteString("\r\nOCR: ")
+		b.WriteString(ocr)
+		b.WriteString("\r\nTranslate: ")
+		b.WriteString(translate)
+	}
+	return b.String()
+}
+
+func currentWorldLabel() string {
+	p := filepath.Join(runtimeDir(), "runtime.log")
+	b, err := os.ReadFile(p)
+	if err != nil {
+		return ""
+	}
+	lines := strings.Split(string(b), "\n")
+	var latest string
+	for i := 0; i < len(lines); i++ {
+		if !strings.Contains(lines[i], "VRC WORLD") {
+			continue
+		}
+		if i+1 < len(lines) {
+			latest = strings.TrimSpace(lines[i+1])
+		}
+	}
+	return latest
+}
+
+func readRuntimeSnapshot() map[string]any {
+	p := filepath.Join(runtimeDir(), "state.json")
+	b, err := os.ReadFile(p)
+	if err != nil {
+		return map[string]any{}
+	}
+	var out map[string]any
+	_ = json.Unmarshal(b, &out)
+	return out
+}
+
+func currentWorldStartTime() time.Time {
+	p := filepath.Join(runtimeDir(), "runtime.log")
+	b, err := os.ReadFile(p)
+	if err != nil {
+		return time.Time{}
+	}
+	var latest time.Time
+	for _, raw := range strings.Split(string(b), "\n") {
+		line := strings.TrimSpace(raw)
+		if line == "" || !strings.Contains(line, "VRC WORLD") {
+			continue
+		}
+		if at, ok := parseRuntimeTime(line); ok && at.After(latest) {
+			latest = at
+		}
+	}
+	return latest
+}
+
+func parseJoinLeaveLine(line string) (time.Time, string, string) {
+	m := joinLeaveLinePattern.FindStringSubmatch(line)
+	if len(m) != 4 {
+		return time.Time{}, "", ""
+	}
+	at, err := time.Parse("2006-01-02 15:04:05", m[1])
+	if err != nil {
+		return time.Time{}, "", ""
+	}
+	return at, m[2], strings.TrimSpace(m[3])
+}
+
+func parseJoinLeaveCount(line string) int {
+	m := regexp.MustCompile(`\((\d+)\)$`).FindStringSubmatch(line)
+	if len(m) != 2 {
+		return 0
+	}
+	n, err := strconv.Atoi(m[1])
+	if err != nil {
+		return 0
+	}
+	return n
+}
+
+func parseRuntimeTime(line string) (time.Time, bool) {
+	m := runtimeTimePattern.FindStringSubmatch(line)
+	if len(m) != 2 {
+		return time.Time{}, false
+	}
+	at, err := time.Parse("2006-01-02 15:04:05", m[1])
+	if err != nil {
+		return time.Time{}, false
+	}
+	return at, true
+}
+
+func countPresent(items []userState) int {
+	n := 0
+	for _, item := range items {
+		if item.Present {
+			n++
+		}
+	}
+	return n
+}
+
+func timeAgo(at time.Time) string {
+	if at.IsZero() {
+		return ""
+	}
+	d := time.Since(at)
+	if d < time.Minute {
+		return "0分前"
+	}
+	if d < time.Hour {
+		return fmt.Sprintf("%d分前", int(d.Minutes()))
+	}
+	if d < 24*time.Hour {
+		return fmt.Sprintf("%d時間前", int(d.Hours()))
+	}
+	return fmt.Sprintf("%d日前", int(d.Hours()/24))
+}
diff --git a/cmd/vrc_osc_launcher/main.go b/cmd/vrc_osc_launcher/main.go
index d3d6155..07f7bdb 100644
--- a/cmd/vrc_osc_launcher/main.go
+++ b/cmd/vrc_osc_launcher/main.go
@@ -4,8 +4,10 @@ import (
 	"flag"
 	"log"
 	"os"
+	"os/exec"
 	"path/filepath"
 	"syscall"
+	"unsafe"
 
 	"vrc_osc_go/internal/buildinfo"
 	"vrc_osc_go/internal/common"
@@ -31,12 +33,18 @@ func main() {
 	if _, err := mgr.CheckAndUpdate(); err != nil {
 		log.Printf("auto update skipped: %v", err)
 	}
-	exe := filepath.Join(common.RootDir(), "vrc_osc.exe")
+	base := runtimeBaseDir()
+	exe := filepath.Join(base, "vrc_osc.exe")
+	gui := filepath.Join(base, "vrc_osc_gui.exe")
 	if _, err := os.Stat(exe); err != nil {
 		showError("vrc_osc_launcher", "missing exe: "+err.Error())
 		log.Fatalf("missing exe: %v", err)
 	}
-	if err := update.Launch(exe, os.Args[1:]); err != nil {
+	if _, err := os.Stat(gui); err == nil {
+		_ = exec.Command(gui).Start()
+	}
+	args := append([]string{"--no-gui"}, os.Args[1:]...)
+	if err := update.Launch(exe, args); err != nil {
 		showError("vrc_osc_launcher", "launch failed: "+err.Error())
 		log.Fatalf("launch failed: %v", err)
 	}
@@ -49,8 +57,19 @@ func showError(title, message string) {
 	const mbIconError = 0x00000010
 	_, _, _ = msgBox.Call(
 		0,
-		uintptr(syscall.StringToUTF16Ptr(message)),
-		uintptr(syscall.StringToUTF16Ptr(title)),
+		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(message))),
+		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(title))),
 		uintptr(mbOK|mbIconError),
 	)
 }
+
+func runtimeBaseDir() string {
+	root := common.RootDir()
+	if _, err := os.Stat(filepath.Join(root, "vrc_osc.exe")); err == nil {
+		return root
+	}
+	if _, err := os.Stat(filepath.Join(root, "tmp", "vrc_osc.exe")); err == nil {
+		return filepath.Join(root, "tmp")
+	}
+	return root
+}
diff --git a/cmd/vrwt_tool/main.go b/cmd/vrwt_tool/main.go
new file mode 100644
index 0000000..dda9087
--- /dev/null
+++ b/cmd/vrwt_tool/main.go
@@ -0,0 +1,33 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+
+	"vrc_osc_go/internal/consenttool"
+)
+
+func main() {
+	var cfgPath string
+	var mode string
+
+	flag.StringVar(&cfgPath, "config", "config/consent.toml", "path to consent tool config")
+	flag.StringVar(&mode, "mode", "", "generate-json or extract-log")
+	flag.Parse()
+
+	if mode == "" && flag.NArg() > 0 {
+		mode = flag.Arg(0)
+	}
+
+	if mode == "" {
+		fmt.Fprintln(os.Stderr, "missing mode: generate-json or extract-log")
+		os.Exit(2)
+	}
+
+	if err := consenttool.Run(cfgPath, mode); err != nil {
+		log.SetOutput(os.Stderr)
+		log.Fatalf("vrwt_tool: %v", err)
+	}
+}
diff --git a/internal/app/app.go b/internal/app/app.go
index c6a6f96..5960fb1 100644
--- a/internal/app/app.go
+++ b/internal/app/app.go
@@ -1,37 +1,75 @@
 package app
 
 import (
-	"fmt"
+	"log"
 	"os"
 	"os/signal"
+	"sync"
 	"syscall"
+	"time"
 
 	"vrc_osc_go/internal/config"
+	"vrc_osc_go/internal/consenttool"
 	"vrc_osc_go/internal/osc"
 )
 
-func Run(configPath string) error {
+type discordMuteState struct {
+	mu            sync.Mutex
+	muted         bool
+	buttonPressed bool
+	lastAction    time.Time
+}
+
+func Run(configPath string, mode string) error {
+	if mode != "" {
+		return consenttool.Run(configPath, mode)
+	}
+
 	cfg, err := config.Load(configPath)
 	if err != nil {
 		return err
 	}
+	InitGuestTracker(NewGuestTracker(cfg.VrcLog.GuestNames))
+	log.Printf("vrc_osc_go starting osc=%s:%d config=%s", cfg.OSC.Host, cfg.OSC.Port, configPath)
 
 	server := osc.NewServer(cfg.OSC.Host, cfg.OSC.Port)
+	discordState := &discordMuteState{muted: true}
+	SetDiscordMuted(true)
 	server.Map("DiscordSend", func(_ string, args []osc.Value) error {
-		return fmt.Errorf("discord mute not implemented yet")
+		log.Printf("received DiscordSend args=%+v", args)
+		if err := handleDiscordSend(discordState, args); err != nil {
+			log.Printf("discord mute failed: %v", err)
+			return err
+		}
+		SetDiscordMuted(discordState.muted)
+		return nil
+	})
+	server.Map("ocrEnabled", func(_ string, args []osc.Value) error {
+		log.Printf("received ocrEnabled args=%+v", args)
+		if err := runPythonOcrFromScreen(); err != nil {
+			log.Printf("ocr failed: %v", err)
+			return err
+		}
+		return nil
 	})
 
 	errCh := make(chan error, 1)
-	go func() { errCh <- server.Serve() }()
+	go func() {
+		log.Printf("osc server listening on %s:%d", cfg.OSC.Host, cfg.OSC.Port)
+		errCh <- server.Serve()
+	}()
+	go watchVrchatLog()
+	startSelfMonitor(cfg, discordState)
 
 	sigCh := make(chan os.Signal, 1)
 	signal.Notify(sigCh, os.Interrupt, syscall.SIGTERM)
 	select {
 	case err := <-errCh:
+		log.Printf("osc server stopped: %v", err)
 		return err
 	case <-sigCh:
+		log.Printf("shutdown signal received")
 		server.Close()
 		return nil
 	}
 }
-
diff --git a/internal/app/discord_mute.go b/internal/app/discord_mute.go
new file mode 100644
index 0000000..7165d9d
--- /dev/null
+++ b/internal/app/discord_mute.go
@@ -0,0 +1,89 @@
+package app
+
+import (
+	"fmt"
+	"log"
+	"strings"
+	"time"
+
+	"vrc_osc_go/internal/osc"
+)
+
+const discordDebounce = 300 * time.Millisecond
+
+func handleDiscordSend(state *discordMuteState, args []osc.Value) error {
+	state.mu.Lock()
+	defer state.mu.Unlock()
+
+	if len(args) == 0 {
+		return fmt.Errorf("OSC args is empty")
+	}
+	isPressed, err := toBool(args[0])
+	if err != nil {
+		return err
+	}
+
+	now := time.Now()
+	if !state.lastAction.IsZero() && now.Sub(state.lastAction) < discordDebounce {
+		return nil
+	}
+
+	if isPressed && !state.buttonPressed {
+		state.buttonPressed = true
+		if state.muted {
+			log.Printf("ACTION VRChat button pressed -> Discord unmute hotkey")
+			if err := pressDiscordMuteHotkey(); err != nil {
+				return err
+			}
+			state.muted = false
+			SetDiscordMuted(state.muted)
+			state.lastAction = now
+		} else {
+			log.Printf("INFO already unmuted")
+		}
+		return nil
+	}
+
+	if !isPressed && state.buttonPressed {
+		state.buttonPressed = false
+		if !state.muted {
+			log.Printf("ACTION VRChat button released -> Discord mute hotkey")
+			if err := pressDiscordMuteHotkey(); err != nil {
+				return err
+			}
+			state.muted = true
+			SetDiscordMuted(state.muted)
+			state.lastAction = now
+		} else {
+			log.Printf("INFO already muted")
+		}
+	}
+
+	return nil
+}
+
+func toBool(v osc.Value) (bool, error) {
+	switch v.Type {
+	case 'T':
+		return true, nil
+	case 'F':
+		return false, nil
+	case 'i':
+		return v.Int != 0, nil
+	case 'f':
+		return v.Float != 0, nil
+	case 's':
+		switch strings.ToLower(strings.TrimSpace(v.Str)) {
+		case "true", "1", "on", "yes":
+			return true, nil
+		case "false", "0", "off", "no":
+			return false, nil
+		default:
+			return false, fmt.Errorf("unsupported OSC value: %q", v.Str)
+		}
+	case 0:
+		return false, fmt.Errorf("unsupported OSC value")
+	default:
+		return false, fmt.Errorf("unsupported OSC type: %q", v.Type)
+	}
+}
diff --git a/internal/app/guest_status.go b/internal/app/guest_status.go
new file mode 100644
index 0000000..15139fe
--- /dev/null
+++ b/internal/app/guest_status.go
@@ -0,0 +1,136 @@
+package app
+
+import (
+	"fmt"
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"sort"
+	"sync"
+	"time"
+
+	"vrc_osc_go/internal/common"
+)
+
+type GuestStatus struct {
+	Name      string    `json:"name"`
+	Present   bool      `json:"present"`
+	LastJoin  time.Time `json:"last_join"`
+	LastLeave time.Time `json:"last_leave"`
+	AbsentFor string    `json:"absent_for"`
+}
+
+type GuestTracker struct {
+	mu      sync.RWMutex
+	current string
+	items   map[string]*GuestStatus
+}
+
+func NewGuestTracker(names []string) *GuestTracker {
+	items := make(map[string]*GuestStatus, len(names))
+	for _, name := range names {
+		items[name] = &GuestStatus{Name: name}
+	}
+	return &GuestTracker{items: items}
+}
+
+func (t *GuestTracker) SetCurrentInstance(label string) {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	t.current = label
+}
+
+func (t *GuestTracker) CurrentInstance() string {
+	t.mu.RLock()
+	defer t.mu.RUnlock()
+	return t.current
+}
+
+func (t *GuestTracker) MarkJoin(name string, at time.Time) {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	s := t.ensure(name)
+	s.Present = true
+	s.LastJoin = at
+	s.AbsentFor = ""
+	_ = t.persistLocked()
+}
+
+func (t *GuestTracker) MarkLeave(name string, at time.Time) {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	s := t.ensure(name)
+	s.Present = false
+	s.LastLeave = at
+	if !s.LastJoin.IsZero() {
+		s.AbsentFor = humanSince(at)
+	}
+	_ = t.persistLocked()
+}
+
+func (t *GuestTracker) Snapshot(now time.Time) []GuestStatus {
+	t.mu.RLock()
+	defer t.mu.RUnlock()
+	out := make([]GuestStatus, 0, len(t.items))
+	for _, s := range t.items {
+		cp := *s
+		if !cp.Present && !cp.LastLeave.IsZero() {
+			cp.AbsentFor = humanSince(cp.LastLeave, now)
+		}
+		out = append(out, cp)
+	}
+	sort.Slice(out, func(i, j int) bool { return out[i].Name < out[j].Name })
+	return out
+}
+
+func (t *GuestTracker) persistLocked() error {
+	dir := filepath.Join(common.RootDir(), "runtime")
+	if err := os.MkdirAll(dir, 0o755); err != nil {
+		return err
+	}
+	snapshot := make([]GuestStatus, 0, len(t.items))
+	for _, s := range t.items {
+		cp := *s
+		snapshot = append(snapshot, cp)
+	}
+	f, err := os.Create(filepath.Join(dir, "guest_snapshot.json"))
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	enc := json.NewEncoder(f)
+	enc.SetIndent("", "  ")
+	return enc.Encode(snapshot)
+}
+
+func (t *GuestTracker) ensure(name string) *GuestStatus {
+	if s, ok := t.items[name]; ok {
+		return s
+	}
+	s := &GuestStatus{Name: name}
+	t.items[name] = s
+	return s
+}
+
+func humanSince(at time.Time, now ...time.Time) string {
+	ref := time.Now()
+	if len(now) > 0 {
+		ref = now[0]
+	}
+	if at.IsZero() {
+		return ""
+	}
+	d := ref.Sub(at)
+	if d < time.Minute {
+		return "1分未満"
+	}
+	m := int(d.Minutes())
+	if m < 60 {
+		return fmt.Sprintf("%d分前", m)
+	}
+	h := m / 60
+	if h < 24 {
+		return fmt.Sprintf("%d時間前", h)
+	}
+	return fmt.Sprintf("%d日前", h/24)
+}
diff --git a/internal/app/ocr.go b/internal/app/ocr.go
new file mode 100644
index 0000000..6f6e2ca
--- /dev/null
+++ b/internal/app/ocr.go
@@ -0,0 +1,30 @@
+package app
+
+import (
+	"fmt"
+	"log"
+	"os/exec"
+)
+
+func runPythonOcrFromScreen() error {
+	script := `
+import sys
+from pathlib import Path
+root = Path(r"C:\Users\kenny\Documents\git\messpy\VRC\VRWT_Tool\VRC_OSC")
+sys.path.insert(0, str(root / "src"))
+from ocr.ocr_actions import runOcrFromScreen
+runOcrFromScreen()
+`
+	cmd := exec.Command("python", "-c", script)
+	cmd.Dir = `C:\Users\kenny\Documents\git\messpy\VRC\VRWT_Tool\VRC_OSC`
+	out, err := cmd.CombinedOutput()
+	if len(out) > 0 {
+		log.Printf("ocr output: %s", string(out))
+		SetOCRText(string(out))
+		SetTranslateText("翻訳: 未実装")
+	}
+	if err != nil {
+		return fmt.Errorf("ocr failed: %w", err)
+	}
+	return nil
+}
diff --git a/internal/app/runtime.go b/internal/app/runtime.go
new file mode 100644
index 0000000..d306a7b
--- /dev/null
+++ b/internal/app/runtime.go
@@ -0,0 +1,52 @@
+package app
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"time"
+
+	"vrc_osc_go/internal/common"
+)
+
+func appendRuntimeLog(title, text string) error {
+	dir := filepath.Join(common.RootDir(), "runtime")
+	if err := os.MkdirAll(dir, 0o755); err != nil {
+		return err
+	}
+	path := filepath.Join(dir, "runtime.log")
+	body := text
+	if body == "" {
+		body = "(empty)"
+	}
+	f, err := os.OpenFile(path, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0o644)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	_, err = fmt.Fprintf(f, "\n[%s] %s\n%s\n", time.Now().Format("2006-01-02 15:04:05"), title, body)
+	return err
+}
+
+func AppendRuntimeLog(title, text string) error {
+	return appendRuntimeLog(title, text)
+}
+
+func appendJoinLeaveLog(text string) error {
+	dir := filepath.Join(common.RootDir(), "runtime")
+	if err := os.MkdirAll(dir, 0o755); err != nil {
+		return err
+	}
+	path := filepath.Join(dir, "join_leave.log")
+	body := text
+	if body == "" {
+		body = "(empty)"
+	}
+	f, err := os.OpenFile(path, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0o644)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	_, err = fmt.Fprintf(f, "\n[%s] VRC JOIN/LEAVE\n%s\n", time.Now().Format("2006-01-02 15:04:05"), body)
+	return err
+}
diff --git a/internal/app/self_monitor.go b/internal/app/self_monitor.go
new file mode 100644
index 0000000..6ac10a6
--- /dev/null
+++ b/internal/app/self_monitor.go
@@ -0,0 +1,69 @@
+package app
+
+import (
+	"log"
+	"os"
+	"regexp"
+	"strings"
+	"time"
+
+	"vrc_osc_go/internal/config"
+	"vrc_osc_go/internal/osc"
+)
+
+var (
+	selfJoinPattern = regexp.MustCompile(`OnPlayerJoined\s+(.+?)\s+\(usr_[0-9a-fA-F-]+\)`)
+	selfLeftPattern = regexp.MustCompile(`OnPlayerLeft\s+(.+?)\s+\(usr_[0-9a-fA-F-]+\)`)
+)
+
+func startSelfMonitor(cfg *config.Config, state *discordMuteState) {
+	if cfg.VrcLog.SelfName == "" {
+		return
+	}
+	go func() {
+		lastState := ""
+		for {
+			path, err := findLatestVrchatLog()
+			if err != nil {
+				time.Sleep(2 * time.Second)
+				continue
+			}
+			text, err := os.ReadFile(path)
+			if err != nil {
+				time.Sleep(2 * time.Second)
+				continue
+			}
+			nextState := extractLatestSelfLogState(string(text), cfg.VrcLog.SelfName)
+			if nextState != "" && nextState != lastState {
+				if nextState == "joined" {
+					if err := handleDiscordSend(state, []osc.Value{{Type: 'T', Bool: true}}); err != nil {
+						log.Printf("self monitor discord mute failed: %v", err)
+					}
+				} else if nextState == "left" {
+					if err := handleDiscordSend(state, []osc.Value{{Type: 'F', Bool: false}}); err != nil {
+						log.Printf("self monitor discord mute failed: %v", err)
+					}
+				}
+				lastState = nextState
+			}
+			time.Sleep(2 * time.Second)
+		}
+	}()
+}
+
+func extractLatestSelfLogState(text, selfName string) string {
+	if selfName == "" {
+		return ""
+	}
+	state := ""
+	for _, rawLine := range strings.Split(text, "\n") {
+		if m := selfJoinPattern.FindStringSubmatch(rawLine); len(m) == 2 && strings.TrimSpace(m[1]) == selfName {
+			state = "joined"
+			continue
+		}
+		if m := selfLeftPattern.FindStringSubmatch(rawLine); len(m) == 2 && strings.TrimSpace(m[1]) == selfName {
+			state = "left"
+		}
+	}
+	return state
+}
diff --git a/internal/app/state.go b/internal/app/state.go
new file mode 100644
index 0000000..4240c98
--- /dev/null
+++ b/internal/app/state.go
@@ -0,0 +1,89 @@
+package app
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"sync"
+	"time"
+
+	"vrc_osc_go/internal/common"
+)
+
+type RuntimeState struct {
+	mu             sync.RWMutex
+	DiscordMuted   bool
+	LastOCRText    string
+	LastTranslate  string
+	CurrentWorld   string
+}
+
+var runtimeState = &RuntimeState{}
+var guestTracker *GuestTracker
+
+func SetGuestTracker(t *GuestTracker) { guestTracker = t }
+func InitGuestTracker(t *GuestTracker) {
+	guestTracker = t
+	if guestTracker != nil {
+		guestTracker.mu.Lock()
+		_ = guestTracker.persistLocked()
+		guestTracker.mu.Unlock()
+	}
+}
+func GetGuestTracker() *GuestTracker  { return guestTracker }
+
+func SetDiscordMuted(v bool) {
+	runtimeState.mu.Lock()
+	runtimeState.DiscordMuted = v
+	runtimeState.mu.Unlock()
+	_ = persistRuntimeState()
+}
+
+func SetOCRText(v string) {
+	runtimeState.mu.Lock()
+	runtimeState.LastOCRText = v
+	runtimeState.mu.Unlock()
+	_ = persistRuntimeState()
+}
+
+func SetTranslateText(v string) {
+	runtimeState.mu.Lock()
+	runtimeState.LastTranslate = v
+	runtimeState.mu.Unlock()
+	_ = persistRuntimeState()
+}
+
+func SetCurrentWorld(v string) {
+	runtimeState.mu.Lock()
+	runtimeState.CurrentWorld = v
+	runtimeState.mu.Unlock()
+	_ = persistRuntimeState()
+}
+
+func SnapshotRuntime() RuntimeState {
+	runtimeState.mu.RLock()
+	defer runtimeState.mu.RUnlock()
+	return *runtimeState
+}
+
+func persistRuntimeState() error {
+	s := SnapshotRuntime()
+	dir := filepath.Join(common.RootDir(), "runtime")
+	if err := os.MkdirAll(dir, 0o755); err != nil {
+		return err
+	}
+	f, err := os.Create(filepath.Join(dir, "state.json"))
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	enc := json.NewEncoder(f)
+	enc.SetIndent("", "  ")
+	return enc.Encode(map[string]any{
+		"discord_muted": s.DiscordMuted,
+		"ocr":           s.LastOCRText,
+		"translate":     s.LastTranslate,
+		"world":         s.CurrentWorld,
+		"updated_at":    time.Now().Format(time.RFC3339),
+	})
+}
diff --git a/internal/app/vrc_log.go b/internal/app/vrc_log.go
new file mode 100644
index 0000000..9a1fdf8
--- /dev/null
+++ b/internal/app/vrc_log.go
@@ -0,0 +1,345 @@
+package app
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strings"
+	"time"
+)
+
+var (
+	joinPattern          = regexp.MustCompile(`OnPlayerJoined\s+(.+?)\s+\(usr_[0-9a-fA-F-]+\)`)
+	leftPattern          = regexp.MustCompile(`OnPlayerLeft\s+(.+?)\s+\(usr_[0-9a-fA-F-]+\)`)
+	worldIdPattern       = regexp.MustCompile(`worldId=(wrld_[0-9a-fA-F-]+)`)
+	instanceIdPattern    = regexp.MustCompile(`instanceId=([^,}\s]+)`)
+	worldNamePattern     = regexp.MustCompile(`worldName=([^,}]+)`)
+	worldLocationPattern = regexp.MustCompile(`worldId=(wrld_[0-9a-fA-F-]+):([^\s,\]\)\"']+)`)
+	worldPattern         = regexp.MustCompile(`(wrld_[0-9a-fA-F-]+(?::[^\s\]\)\"']+)?)`)
+	enteringRoomPattern  = regexp.MustCompile(`\[Behaviour\]\s+(?:Entering Room|Joining or Creating Room):\s+(.+)$`)
+)
+
+type vrcLogState struct {
+	location         string
+	worldID          string
+	instanceID       string
+	worldName        string
+	pendingWorldName string
+	presentSet       map[string]struct{}
+	initialized      bool
+}
+
+func getVrchatLogDir() (string, error) {
+	userProfile := os.Getenv("USERPROFILE")
+	if userProfile == "" {
+		return "", os.ErrNotExist
+	}
+	return filepath.Join(userProfile, "AppData", "LocalLow", "VRChat", "VRChat"), nil
+}
+
+func findLatestVrchatLog() (string, error) {
+	dir, err := getVrchatLogDir()
+	if err != nil {
+		return "", err
+	}
+
+	entries, err := os.ReadDir(dir)
+	if err != nil {
+		return "", err
+	}
+
+	var latest string
+	var latestMod time.Time
+	for _, entry := range entries {
+		if entry.IsDir() {
+			continue
+		}
+		name := entry.Name()
+		if !strings.HasSuffix(strings.ToLower(name), ".log") && !strings.HasSuffix(strings.ToLower(name), ".txt") {
+			continue
+		}
+		info, err := entry.Info()
+		if err != nil {
+			continue
+		}
+		if info.ModTime().After(latestMod) {
+			latestMod = info.ModTime()
+			latest = filepath.Join(dir, name)
+		}
+	}
+	if latest == "" {
+		return "", os.ErrNotExist
+	}
+	return latest, nil
+}
+
+func watchVrchatLog() {
+	lastPath := ""
+	lastSize := int64(0)
+	state := &vrcLogState{
+		presentSet: map[string]struct{}{},
+	}
+	for {
+		path, err := findLatestVrchatLog()
+		if err != nil {
+			time.Sleep(2 * time.Second)
+			continue
+		}
+		info, err := os.Stat(path)
+		if err != nil {
+			time.Sleep(2 * time.Second)
+			continue
+		}
+		if path != lastPath {
+			log.Printf("vrchat log watching %s", path)
+			lastPath = path
+			lastSize = 0
+			if err := scanExistingVrchatLog(path, state); err != nil {
+				log.Printf("vrchat log initial scan failed: %v", err)
+			}
+			if info2, err := os.Stat(path); err == nil {
+				lastSize = info2.Size()
+			} else {
+				lastSize = info.Size()
+			}
+			time.Sleep(2 * time.Second)
+			continue
+		}
+
+		if info.Size() < lastSize {
+			lastSize = 0
+		}
+		if info.Size() > lastSize {
+			f, err := os.Open(path)
+			if err != nil {
+				time.Sleep(2 * time.Second)
+				continue
+			}
+			_, _ = f.Seek(lastSize, 0)
+			scanner := bufio.NewScanner(f)
+			for scanner.Scan() {
+				line := scanner.Text()
+				if err := appendRuntimeLog("VRC LOG", line); err != nil {
+					log.Printf("append runtime log failed: %v", err)
+				}
+				if changed, worldLabel := updateWorldState(state, line); changed {
+					log.Printf("world changed: %s", worldLabel)
+					state.presentSet = map[string]struct{}{}
+					SetCurrentWorld(worldLabel)
+					if tracker := GetGuestTracker(); tracker != nil {
+						tracker.SetCurrentInstance(worldLabel)
+					}
+					_ = appendRuntimeLog("VRC WORLD", worldLabel)
+				}
+				at := extractLineTime(line)
+				if m := joinPattern.FindStringSubmatch(line); len(m) == 2 {
+					name := strings.TrimSpace(m[1])
+					state.presentSet[name] = struct{}{}
+					if tracker := GetGuestTracker(); tracker != nil {
+						tracker.MarkJoin(name, at)
+					}
+					out := fmt.Sprintf("[join] %s (%d)", name, len(state.presentSet))
+					log.Print(out)
+					_ = appendJoinLeaveLog(out)
+					continue
+				}
+				if m := leftPattern.FindStringSubmatch(line); len(m) == 2 {
+					name := strings.TrimSpace(m[1])
+					delete(state.presentSet, name)
+					if tracker := GetGuestTracker(); tracker != nil {
+						tracker.MarkLeave(name, at)
+					}
+					out := fmt.Sprintf("[leave] %s (%d)", name, len(state.presentSet))
+					log.Print(out)
+					_ = appendJoinLeaveLog(out)
+					continue
+				}
+			}
+			lastSize = info.Size()
+			_ = f.Close()
+		}
+		time.Sleep(2 * time.Second)
+	}
+}
+
+func scanExistingVrchatLog(path string, state *vrcLogState) error {
+	f, err := os.Open(path)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	state.presentSet = map[string]struct{}{}
+	state.location = ""
+	state.worldID = ""
+	state.instanceID = ""
+	state.worldName = ""
+	state.pendingWorldName = ""
+	state.initialized = false
+
+	scanner := bufio.NewScanner(f)
+	for scanner.Scan() {
+		line := scanner.Text()
+		if changed, _ := updateWorldState(state, line); changed {
+			state.presentSet = map[string]struct{}{}
+		}
+		if m := joinPattern.FindStringSubmatch(line); len(m) == 2 {
+			name := strings.TrimSpace(m[1])
+			state.presentSet[name] = struct{}{}
+			if tracker := GetGuestTracker(); tracker != nil {
+				tracker.MarkJoin(name, extractLineTime(line))
+			}
+			continue
+		}
+		if m := leftPattern.FindStringSubmatch(line); len(m) == 2 {
+			name := strings.TrimSpace(m[1])
+			delete(state.presentSet, name)
+			if tracker := GetGuestTracker(); tracker != nil {
+				tracker.MarkLeave(name, extractLineTime(line))
+			}
+			continue
+		}
+	}
+	if err := scanner.Err(); err != nil {
+		return err
+	}
+	state.initialized = true
+	if state.worldName != "" {
+		log.Printf("world changed: %s", state.worldName)
+		SetCurrentWorld(state.worldName)
+		if tracker := GetGuestTracker(); tracker != nil {
+			tracker.SetCurrentInstance(state.worldName)
+		}
+		_ = appendRuntimeLog("VRC WORLD", state.worldName)
+	}
+	return nil
+}
+
+func updateWorldState(state *vrcLogState, line string) (bool, string) {
+	worldID := ""
+	instanceID := ""
+	worldName := ""
+	roomTitle := ""
+
+	if m := enteringRoomPattern.FindStringSubmatch(line); len(m) == 2 {
+		roomTitle = strings.TrimSpace(m[1])
+		state.pendingWorldName = roomTitle
+	}
+	if m := worldLocationPattern.FindStringSubmatch(line); len(m) == 3 {
+		worldID = strings.TrimSpace(m[1])
+		instanceID = strings.TrimSpace(m[2])
+	}
+
+	if m := worldIdPattern.FindStringSubmatch(line); len(m) == 2 {
+		worldID = strings.TrimSpace(m[1])
+	}
+	if m := instanceIdPattern.FindStringSubmatch(line); len(m) == 2 {
+		instanceID = strings.TrimSpace(m[1])
+	}
+	if m := worldNamePattern.FindStringSubmatch(line); len(m) == 2 {
+		worldName = strings.TrimSpace(m[1])
+	}
+
+	if m := enteringRoomPattern.FindStringSubmatch(line); len(m) == 2 && worldID == "" {
+		if worldMatch := worldPattern.FindStringSubmatch(m[1]); len(worldMatch) == 2 {
+			worldID = worldMatch[1]
+		}
+	}
+
+	nextLocation := ""
+	if worldID != "" {
+		nextLocation = worldID
+		if instanceID != "" {
+			nextLocation = worldID + ":" + instanceID
+		}
+	}
+
+	if nextLocation != "" && nextLocation != state.location {
+		state.location = nextLocation
+		state.worldID = worldID
+		state.instanceID = instanceID
+		if worldName != "" {
+			state.worldName = worldName
+		} else if shouldUseRoomTitlePreferLatest(roomTitle, state.worldName) {
+			state.worldName = roomTitle
+		}
+		label := state.worldName
+		if label == "" {
+			label = state.worldID
+		}
+		if label == "" {
+			label = nextLocation
+		}
+		if state.initialized {
+			log.Printf("world changed: %s", label)
+			_ = appendRuntimeLog("VRC WORLD", label)
+		}
+		return true, label
+	}
+
+	if worldName != "" {
+		state.worldName = worldName
+		state.pendingWorldName = ""
+		return false, ""
+	}
+	if shouldUseRoomTitlePreferLatest(roomTitle, state.worldName) {
+		state.worldName = roomTitle
+	}
+
+	return false, ""
+}
+
+func shouldUseRoomTitle(roomTitle, currentWorldName string) bool {
+	if roomTitle == "" {
+		return false
+	}
+	if strings.Contains(roomTitle, "Home Location") {
+		return false
+	}
+	if roomTitle == "Holiday-Cottage" && currentWorldName != "" && currentWorldName != roomTitle {
+		return false
+	}
+	if currentWorldName == "" {
+		return true
+	}
+	if roomTitle == currentWorldName {
+		return false
+	}
+	if len(roomTitle) > len(currentWorldName) {
+		return true
+	}
+	if strings.Contains(roomTitle, "「") || strings.Contains(roomTitle, "」") || strings.Contains(roomTitle, "[") {
+		return true
+	}
+	return false
+}
+
+func shouldUseRoomTitlePreferLatest(roomTitle, currentWorldName string) bool {
+	if roomTitle == "" {
+		return false
+	}
+	if strings.Contains(roomTitle, "Home Location") {
+		return false
+	}
+	if currentWorldName == "" {
+		return true
+	}
+	if roomTitle == currentWorldName {
+		return false
+	}
+	return true
+}
+
+func extractLineTime(line string) time.Time {
+	if len(line) < 19 {
+		return time.Now()
+	}
+	t, err := time.ParseInLocation("2006.01.02 15:04:05", line[:19], time.Local)
+	if err == nil {
+		return t
+	}
+	return time.Now()
+}
diff --git a/internal/buildinfo/buildinfo.go b/internal/buildinfo/buildinfo.go
new file mode 100644
index 0000000..f63e477
--- /dev/null
+++ b/internal/buildinfo/buildinfo.go
@@ -0,0 +1,6 @@
+package buildinfo
+
+var (
+	Version   = "dev"
+	BuildTime = "unknown"
+)
diff --git a/internal/common/project_paths.go b/internal/common/project_paths.go
new file mode 100644
index 0000000..76b587c
--- /dev/null
+++ b/internal/common/project_paths.go
@@ -0,0 +1,16 @@
+package common
+
+import (
+	"os"
+	"path/filepath"
+)
+
+func RuntimeBaseDir() string {
+	exe, err := os.Executable()
+	if err == nil {
+		return filepath.Dir(exe)
+	}
+	return "."
+}
+
+func RootDir() string { return RuntimeBaseDir() }
diff --git a/internal/config/config.go b/internal/config/config.go
index ed1319b..e584686 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -3,12 +3,16 @@ package config
 import (
 	"bufio"
 	"os"
+	"path/filepath"
 	"strconv"
 	"strings"
+
+	"vrc_osc_go/internal/common"
 )
 
 type Config struct {
-	OSC OSCConfig
+	OSC    OSCConfig
+	VrcLog VrcLogConfig
 }
 
 type OSCConfig struct {
@@ -16,8 +20,24 @@ type OSCConfig struct {
 	Port int
 }
 
+type VrcLogConfig struct {
+	SelfName     string
+	GuestNames   []string
+	GuestFile    string
+	StaffNames   []string
+	MissingCount int
+	LogPatterns  []string
+}
+
 func Load(path string) (*Config, error) {
-	cfg := &Config{OSC: OSCConfig{Host: "127.0.0.1", Port: 9001}}
+	cfg := &Config{
+		OSC: OSCConfig{Host: "127.0.0.1", Port: 9001},
+	}
+	if path == "" {
+		path = filepath.Join(common.RootDir(), "config", "config.toml")
+	} else if !filepath.IsAbs(path) {
+		path = filepath.Join(common.RootDir(), path)
+	}
 	file, err := os.Open(path)
 	if err != nil {
 		return cfg, nil
@@ -28,6 +48,7 @@ func Load(path string) (*Config, error) {
 	scanner := bufio.NewScanner(file)
 	for scanner.Scan() {
 		line := strings.TrimSpace(scanner.Text())
+		line = strings.TrimPrefix(line, "\ufeff")
 		if line == "" || strings.HasPrefix(line, "#") {
 			continue
 		}
@@ -42,7 +63,8 @@ func Load(path string) (*Config, error) {
 		key := strings.TrimSpace(parts[0])
 		val := strings.TrimSpace(parts[1])
 		val = strings.Trim(val, "\"'")
-		if section == "osc" {
+		switch section {
+		case "osc":
 			switch key {
 			case "host":
 				cfg.OSC.Host = val
@@ -51,8 +73,74 @@ func Load(path string) (*Config, error) {
 					cfg.OSC.Port = n
 				}
 			}
+		case "self":
+			if key == "name" {
+				cfg.VrcLog.SelfName = val
+			}
+		case "notice":
+			if key == "missing_count" {
+				if n, err := strconv.Atoi(val); err == nil {
+					cfg.VrcLog.MissingCount = n
+				}
+			}
+		case "vrc_log":
+			if key == "patterns" {
+				cfg.VrcLog.LogPatterns = parseList(val)
+			}
+		case "staff":
+			if key == "names" {
+				cfg.VrcLog.StaffNames = parseList(val)
+			}
+		case "guest":
+			switch key {
+			case "names":
+				cfg.VrcLog.GuestNames = parseList(val)
+			case "file":
+				cfg.VrcLog.GuestFile = val
+			}
+		}
+	}
+	if cfg.VrcLog.GuestFile != "" {
+		if !filepath.IsAbs(cfg.VrcLog.GuestFile) {
+			cfg.VrcLog.GuestFile = filepath.Join(common.RootDir(), cfg.VrcLog.GuestFile)
+		}
+		if names, err := loadLines(cfg.VrcLog.GuestFile); err == nil {
+			cfg.VrcLog.GuestNames = names
 		}
 	}
 	return cfg, scanner.Err()
 }
 
+func parseList(value string) []string {
+	value = strings.TrimSpace(value)
+	value = strings.TrimPrefix(value, "[")
+	value = strings.TrimSuffix(value, "]")
+	if value == "" {
+		return nil
+	}
+	parts := strings.Split(value, ",")
+	out := make([]string, 0, len(parts))
+	for _, part := range parts {
+		part = strings.TrimSpace(strings.Trim(part, "\"'"))
+		if part != "" {
+			out = append(out, part)
+		}
+	}
+	return out
+}
+
+func loadLines(path string) ([]string, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+	lines := strings.Split(string(data), "\n")
+	out := make([]string, 0, len(lines))
+	for _, line := range lines {
+		line = strings.TrimSpace(strings.TrimPrefix(line, "\ufeff"))
+		if line != "" && !strings.HasPrefix(line, "#") {
+			out = append(out, line)
+		}
+	}
+	return out, nil
+}
diff --git a/internal/consenttool/config.go b/internal/consenttool/config.go
new file mode 100644
index 0000000..702f2ca
--- /dev/null
+++ b/internal/consenttool/config.go
@@ -0,0 +1,144 @@
+package consenttool
+
+import (
+	"bufio"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+)
+
+type Config struct {
+	Consent ConsentConfig
+	Log     LogConfig
+}
+
+type ConsentConfig struct {
+	InputCSV        string
+	OutputJSON      string
+	DisplayFields   []string
+	ConsentFields   []string
+	ConsentValues   []string
+	NormalizeCase   bool
+	AllowDuplicates bool
+}
+
+type LogConfig struct {
+	InputPath    string
+	OutputPath   string
+	IncludeRegex string
+	KeepNonMatch bool
+}
+
+func LoadConfig(path string) (*Config, error) {
+	cfg := &Config{
+		Consent: ConsentConfig{
+			InputCSV:        "config/consent.csv",
+			OutputJSON:      "config/consent_list.json",
+			DisplayFields:   []string{"display_name", "vrchat_name", "name"},
+			ConsentFields:   []string{"consent", "agree", "agreed", "checked"},
+			ConsentValues:   []string{"1", "true", "yes", "y", "on", "checked"},
+			NormalizeCase:   false,
+			AllowDuplicates: false,
+		},
+		Log: LogConfig{
+			InputPath:    "runtime/output_log.txt",
+			OutputPath:   "runtime/research_log.txt",
+			IncludeRegex: `\[[A-Z0-9:_ -]+\]`,
+			KeepNonMatch: false,
+		},
+	}
+
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	var section string
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		line = strings.TrimPrefix(line, "\ufeff")
+		if line == "" || strings.HasPrefix(line, "#") {
+			continue
+		}
+		if strings.HasPrefix(line, "[") && strings.HasSuffix(line, "]") {
+			section = strings.Trim(line, "[]")
+			continue
+		}
+		parts := strings.SplitN(line, "=", 2)
+		if len(parts) != 2 {
+			continue
+		}
+		key := strings.TrimSpace(parts[0])
+		val := strings.TrimSpace(parts[1])
+		val = strings.Trim(val, "\"'")
+
+		switch section {
+		case "consent":
+			switch key {
+			case "input_csv":
+				cfg.Consent.InputCSV = val
+			case "output_json":
+				cfg.Consent.OutputJSON = val
+			case "display_fields":
+				cfg.Consent.DisplayFields = parseList(val)
+			case "consent_fields":
+				cfg.Consent.ConsentFields = parseList(val)
+			case "consent_values":
+				cfg.Consent.ConsentValues = parseList(val)
+			case "normalize_case":
+				cfg.Consent.NormalizeCase = parseBool(val)
+			case "allow_duplicates":
+				cfg.Consent.AllowDuplicates = parseBool(val)
+			}
+		case "log":
+			switch key {
+			case "input_path":
+				cfg.Log.InputPath = val
+			case "output_path":
+				cfg.Log.OutputPath = val
+			case "include_regex":
+				cfg.Log.IncludeRegex = val
+			case "keep_non_match":
+				cfg.Log.KeepNonMatch = parseBool(val)
+			}
+		}
+	}
+	return cfg, scanner.Err()
+}
+
+func parseList(value string) []string {
+	value = strings.TrimSpace(value)
+	value = strings.TrimPrefix(value, "[")
+	value = strings.TrimSuffix(value, "]")
+	if value == "" {
+		return nil
+	}
+	items := strings.Split(value, ",")
+	out := make([]string, 0, len(items))
+	for _, item := range items {
+		item = strings.TrimSpace(item)
+		item = strings.Trim(item, "\"'")
+		if item != "" {
+			out = append(out, item)
+		}
+	}
+	return out
+}
+
+func parseBool(value string) bool {
+	n, err := strconv.ParseBool(strings.TrimSpace(value))
+	return err == nil && n
+}
+
+func resolvePath(baseDir, value string) string {
+	if value == "" {
+		return ""
+	}
+	if filepath.IsAbs(value) {
+		return value
+	}
+	return filepath.Clean(filepath.Join(baseDir, value))
+}
diff --git a/internal/consenttool/tool.go b/internal/consenttool/tool.go
new file mode 100644
index 0000000..1a58dd2
--- /dev/null
+++ b/internal/consenttool/tool.go
@@ -0,0 +1,183 @@
+package consenttool
+
+import (
+	"encoding/csv"
+	"encoding/json"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strings"
+)
+
+func Run(configPath string, mode string) error {
+	cfg, err := LoadConfig(configPath)
+	if err != nil {
+		return err
+	}
+	baseDir := filepath.Dir(configPath)
+
+	switch mode {
+	case "generate-json":
+		return generateJSON(cfg, baseDir)
+	case "extract-log":
+		return extractLog(cfg, baseDir)
+	default:
+		return fmt.Errorf("unknown mode %q", mode)
+	}
+}
+
+func generateJSON(cfg *Config, baseDir string) error {
+	inputPath := resolvePath(baseDir, cfg.Consent.InputCSV)
+	outputPath := resolvePath(baseDir, cfg.Consent.OutputJSON)
+
+	rows, err := readCSVRows(inputPath)
+	if err != nil {
+		return err
+	}
+
+	names := collectConsentedNames(rows, cfg.Consent)
+	body, err := json.MarshalIndent(names, "", "  ")
+	if err != nil {
+		return err
+	}
+
+	if err := os.MkdirAll(filepath.Dir(outputPath), 0o755); err != nil {
+		return err
+	}
+	return os.WriteFile(outputPath, append(body, '\n'), 0o644)
+}
+
+func extractLog(cfg *Config, baseDir string) error {
+	inputPath := resolvePath(baseDir, cfg.Log.InputPath)
+	outputPath := resolvePath(baseDir, cfg.Log.OutputPath)
+
+	data, err := os.ReadFile(inputPath)
+	if err != nil {
+		return err
+	}
+
+	re, err := regexp.Compile(cfg.Log.IncludeRegex)
+	if err != nil {
+		return err
+	}
+
+	var kept []string
+	for _, line := range strings.Split(strings.ReplaceAll(string(data), "\r\n", "\n"), "\n") {
+		if re.MatchString(line) {
+			kept = append(kept, line)
+			continue
+		}
+		if cfg.Log.KeepNonMatch {
+			kept = append(kept, line)
+		}
+	}
+
+	body := strings.Join(kept, "\n")
+	if body != "" {
+		body += "\n"
+	}
+	if err := os.MkdirAll(filepath.Dir(outputPath), 0o755); err != nil {
+		return err
+	}
+	return os.WriteFile(outputPath, []byte(body), 0o644)
+}
+
+func readCSVRows(path string) ([]map[string]string, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	r := csv.NewReader(file)
+	headers, err := r.Read()
+	if err != nil {
+		return nil, err
+	}
+	for i, header := range headers {
+		headers[i] = strings.TrimPrefix(strings.TrimSpace(header), "\ufeff")
+	}
+
+	var rows []map[string]string
+	for {
+		record, err := r.Read()
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			return nil, err
+		}
+		row := make(map[string]string, len(headers))
+		for i, header := range headers {
+			if i < len(record) {
+				row[strings.TrimSpace(header)] = strings.TrimPrefix(strings.TrimSpace(record[i]), "\ufeff")
+			}
+		}
+		rows = append(rows, row)
+	}
+	return rows, nil
+}
+
+func collectConsentedNames(rows []map[string]string, cfg ConsentConfig) []string {
+	displayFields := cfg.DisplayFields
+	if len(displayFields) == 0 {
+		displayFields = []string{"display_name", "vrchat_name", "name"}
+	}
+	consentFields := cfg.ConsentFields
+	if len(consentFields) == 0 {
+		consentFields = []string{"consent", "agree", "agreed", "checked"}
+	}
+	accepted := make(map[string]struct{})
+	var names []string
+
+	for _, row := range rows {
+		if !rowIsConsented(row, consentFields, cfg.ConsentValues) {
+			continue
+		}
+		name := firstNonEmpty(row, displayFields)
+		if name == "" {
+			continue
+		}
+		key := name
+		if cfg.NormalizeCase {
+			key = strings.ToLower(key)
+		}
+		if !cfg.AllowDuplicates {
+			if _, ok := accepted[key]; ok {
+				continue
+			}
+			accepted[key] = struct{}{}
+		}
+		names = append(names, name)
+	}
+	return names
+}
+
+func rowIsConsented(row map[string]string, fields []string, values []string) bool {
+	if len(values) == 0 {
+		values = []string{"1", "true", "yes", "y", "on", "checked"}
+	}
+	allowed := make(map[string]struct{}, len(values))
+	for _, v := range values {
+		allowed[strings.ToLower(strings.TrimSpace(v))] = struct{}{}
+	}
+	for _, field := range fields {
+		if v, ok := row[field]; ok {
+			if _, ok := allowed[strings.ToLower(strings.TrimSpace(v))]; ok {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+func firstNonEmpty(row map[string]string, fields []string) string {
+	for _, field := range fields {
+		if v := strings.TrimSpace(row[field]); v != "" {
+			return v
+		}
+	}
+	return ""
+}
diff --git a/internal/consenttool/tool_test.go b/internal/consenttool/tool_test.go
new file mode 100644
index 0000000..a7ef4b6
--- /dev/null
+++ b/internal/consenttool/tool_test.go
@@ -0,0 +1,44 @@
+package consenttool
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestCollectConsentedNames(t *testing.T) {
+	rows := []map[string]string{
+		{"display_name": "Alice", "consent": "true"},
+		{"display_name": "Bob", "consent": "false"},
+		{"display_name": "Alice", "consent": "yes"},
+	}
+
+	names := collectConsentedNames(rows, ConsentConfig{})
+	if len(names) != 1 || names[0] != "Alice" {
+		t.Fatalf("unexpected names: %#v", names)
+	}
+}
+
+func TestExtractLog(t *testing.T) {
+	dir := t.TempDir()
+	cfg := &Config{
+		Log: LogConfig{
+			InputPath:    "input.log",
+			OutputPath:   "out.log",
+			IncludeRegex: `ID:[0-9]+`,
+		},
+	}
+	if err := os.WriteFile(filepath.Join(dir, "input.log"), []byte("x\nID:1 hello\nnope\n"), 0o600); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	}
+	if err := extractLog(cfg, dir); err != nil {
+		t.Fatalf("extractLog: %v", err)
+	}
+	out, err := os.ReadFile(filepath.Join(dir, "out.log"))
+	if err != nil {
+		t.Fatalf("ReadFile: %v", err)
+	}
+	if string(out) != "ID:1 hello\n" {
+		t.Fatalf("unexpected output: %q", string(out))
+	}
+}
diff --git a/internal/osc/server.go b/internal/osc/server.go
index c56871c..2488509 100644
--- a/internal/osc/server.go
+++ b/internal/osc/server.go
@@ -2,7 +2,9 @@ package osc
 
 import (
 	"bytes"
+	"encoding/binary"
 	"fmt"
+	"math"
 	"net"
 	"strings"
 	"sync"
@@ -33,7 +35,12 @@ func NewServer(host string, port int) *Server {
 }
 
 func (s *Server) Map(param string, h Handler) { s.handlers["/avatar/parameters/"+param] = h }
-func (s *Server) Close() error                { if s.conn != nil { return s.conn.Close() }; return nil }
+func (s *Server) Close() error {
+	if s.conn != nil {
+		return s.conn.Close()
+	}
+	return nil
+}
 
 func (s *Server) Serve() error {
 	addr, err := net.ResolveUDPAddr("udp", s.addr)
@@ -65,13 +72,70 @@ func (s *Server) Serve() error {
 }
 
 func parseMessage(b []byte) (string, []Value, error) {
-	parts := bytes.SplitN(b, []byte{0}, 2)
-	if len(parts) == 0 {
-		return "", nil, fmt.Errorf("invalid osc")
+	address, offset, err := parsePaddedString(b, 0)
+	if err != nil {
+		return "", nil, err
 	}
-	address := string(parts[0])
 	if !strings.HasPrefix(address, "/") {
 		return "", nil, fmt.Errorf("invalid address")
 	}
-	return address, nil, nil
+	if offset >= len(b) {
+		return address, nil, nil
+	}
+	typetags, offset, err := parsePaddedString(b, offset)
+	if err != nil {
+		return "", nil, err
+	}
+	if !strings.HasPrefix(typetags, ",") {
+		return address, nil, nil
+	}
+	var values []Value
+	for _, tag := range typetags[1:] {
+		switch tag {
+		case 'i':
+			if offset+4 > len(b) {
+				return "", nil, fmt.Errorf("invalid int")
+			}
+			values = append(values, Value{Type: 'i', Int: int32(binary.BigEndian.Uint32(b[offset : offset+4]))})
+			offset += 4
+		case 'f':
+			if offset+4 > len(b) {
+				return "", nil, fmt.Errorf("invalid float")
+			}
+			bits := binary.BigEndian.Uint32(b[offset : offset+4])
+			values = append(values, Value{Type: 'f', Float: math.Float32frombits(bits)})
+			offset += 4
+		case 's':
+			s, next, err := parsePaddedString(b, offset)
+			if err != nil {
+				return "", nil, err
+			}
+			values = append(values, Value{Type: 's', Str: s})
+			offset = next
+		case 'T':
+			values = append(values, Value{Type: 'T', Bool: true})
+		case 'F':
+			values = append(values, Value{Type: 'F', Bool: false})
+		}
+	}
+	return address, values, nil
+}
+
+func parsePaddedString(b []byte, offset int) (string, int, error) {
+	if offset >= len(b) {
+		return "", offset, fmt.Errorf("invalid osc string")
+	}
+	end := bytes.IndexByte(b[offset:], 0)
+	if end < 0 {
+		return "", offset, fmt.Errorf("invalid osc string")
+	}
+	s := string(b[offset : offset+end])
+	next := offset + end + 1
+	for next%4 != 0 {
+		next++
+	}
+	if next > len(b) {
+		next = len(b)
+	}
+	return s, next, nil
 }
diff --git a/internal/update/manager.go b/internal/update/manager.go
new file mode 100644
index 0000000..e377fab
--- /dev/null
+++ b/internal/update/manager.go
@@ -0,0 +1,106 @@
+package update
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+
+	"vrc_osc_go/internal/buildinfo"
+	"vrc_osc_go/internal/common"
+)
+
+type Manager struct {
+	Client       *Client
+	OwnerRepo    string
+	AssetName    string
+	CurrentLabel string
+}
+
+func (m *Manager) CheckAndUpdate() (bool, error) {
+	if m.Client == nil || m.OwnerRepo == "" || m.AssetName == "" {
+		return false, nil
+	}
+	latest, err := m.Client.LatestRelease(m.OwnerRepo)
+	if err != nil {
+		return false, err
+	}
+	if latest.TagName == "" || latest.TagName == m.CurrentLabel {
+		return false, nil
+	}
+	assetURL := ""
+	for _, a := range latest.Assets {
+		if a.Name == m.AssetName {
+			assetURL = a.URL
+			break
+		}
+	}
+	if assetURL == "" {
+		return false, fmt.Errorf("asset %q not found in release %s", m.AssetName, latest.TagName)
+	}
+	base := common.RootDir()
+	tmpDir := filepath.Join(base, "update", latest.TagName)
+	if err := os.MkdirAll(tmpDir, 0o755); err != nil {
+		return false, err
+	}
+	zipPath := filepath.Join(tmpDir, m.AssetName)
+	log.Printf("update available: %s -> %s", m.CurrentLabel, latest.TagName)
+	if err := m.Client.DownloadAsset(assetURL, zipPath); err != nil {
+		return false, err
+	}
+	if err := ExtractZip(zipPath, tmpDir); err != nil {
+		return false, err
+	}
+	exePath := filepath.Join(base, CurrentExeName())
+	newExe := filepath.Join(tmpDir, CurrentExeName())
+	if _, err := os.Stat(newExe); err != nil {
+		return false, err
+	}
+	backup := exePath + ".bak"
+	_ = os.Remove(backup)
+	if err := os.Rename(exePath, backup); err != nil {
+		return false, err
+	}
+	if err := CopyFile(newExe, exePath); err != nil {
+		_ = os.Rename(backup, exePath)
+		return false, err
+	}
+	_ = os.Remove(backup)
+	return true, nil
+}
+
+func CopyFile(src, dst string) error {
+	in, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	defer in.Close()
+	if err := os.MkdirAll(filepath.Dir(dst), 0o755); err != nil {
+		return err
+	}
+	out, err := os.Create(dst)
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+	_, err = io.Copy(out, in)
+	return err
+}
+
+func Launch(exe string, args []string) error {
+	cmd := exec.Command(exe, args...)
+	cmd.Dir = filepath.Dir(exe)
+	return cmd.Start()
+}
+
+func Version() string { return buildinfo.Version }
+
+func CurrentExeName() string {
+	if runtime.GOOS == "windows" {
+		return "vrc_osc.exe"
+	}
+	return "vrc_osc"
+}
diff --git a/internal/update/release.go b/internal/update/release.go
new file mode 100644
index 0000000..8fff9f1
--- /dev/null
+++ b/internal/update/release.go
@@ -0,0 +1,125 @@
+package update
+
+import (
+	"archive/zip"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+type ReleaseInfo struct {
+	TagName string `json:"tag_name"`
+	Assets  []struct {
+		Name string `json:"name"`
+		URL  string `json:"browser_download_url"`
+	} `json:"assets"`
+}
+
+type Client struct {
+	BaseURL string
+	HTTP    *http.Client
+}
+
+func (c *Client) LatestRelease(ownerRepo string) (*ReleaseInfo, error) {
+	req, err := http.NewRequest(http.MethodGet, c.apiURL(ownerRepo, "/releases/latest"), nil)
+	if err != nil {
+		return nil, err
+	}
+	var info ReleaseInfo
+	if err := c.doJSON(req, &info); err != nil {
+		return nil, err
+	}
+	return &info, nil
+}
+
+func (c *Client) DownloadAsset(url, dst string) error {
+	req, err := http.NewRequest(http.MethodGet, url, nil)
+	if err != nil {
+		return err
+	}
+	resp, err := c.httpClient().Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("download failed: %s", resp.Status)
+	}
+	f, err := os.Create(dst)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	_, err = io.Copy(f, resp.Body)
+	return err
+}
+
+func ExtractZip(zipPath, dstDir string) error {
+	zr, err := zip.OpenReader(zipPath)
+	if err != nil {
+		return err
+	}
+	defer zr.Close()
+	root := filepath.Clean(dstDir) + string(os.PathSeparator)
+	for _, f := range zr.File {
+		target := filepath.Clean(filepath.Join(dstDir, f.Name))
+		if target != filepath.Clean(dstDir) && !strings.HasPrefix(target, root) {
+			return fmt.Errorf("zip path escapes destination: %s", f.Name)
+		}
+		if f.FileInfo().IsDir() {
+			if err := os.MkdirAll(target, 0o755); err != nil {
+				return err
+			}
+			continue
+		}
+		if err := os.MkdirAll(filepath.Dir(target), 0o755); err != nil {
+			return err
+		}
+		rc, err := f.Open()
+		if err != nil {
+			return err
+		}
+		out, err := os.Create(target)
+		if err != nil {
+			rc.Close()
+			return err
+		}
+		_, copyErr := io.Copy(out, rc)
+		out.Close()
+		rc.Close()
+		if copyErr != nil {
+			return copyErr
+		}
+	}
+	return nil
+}
+
+func (c *Client) apiURL(ownerRepo, suffix string) string {
+	base := strings.TrimRight(c.BaseURL, "/")
+	return base + "/api/v1/repos/" + strings.Trim(ownerRepo, "/") + suffix
+}
+
+func (c *Client) doJSON(req *http.Request, out any) error {
+	resp, err := c.httpClient().Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		body, _ := io.ReadAll(io.LimitReader(resp.Body, 2048))
+		return fmt.Errorf("request failed: %s: %s", resp.Status, strings.TrimSpace(string(body)))
+	}
+	return json.NewDecoder(resp.Body).Decode(out)
+}
+
+func (c *Client) httpClient() *http.Client {
+	if c.HTTP != nil {
+		return c.HTTP
+	}
+	return &http.Client{Timeout: 30 * time.Second}
+}