diff --git a/.air.toml b/.air.toml
index c46b56f..d7ff5c6 100644
--- a/.air.toml
+++ b/.air.toml
@@ -5,7 +5,7 @@ tmp_dir = "tmp"
 [build]
   args_bin = []
   bin = "tmp\\main.exe"
-  cmd = "go build -ldflags='-H windowsgui' -o ./tmp/main.exe ./example"
+  cmd = "go build -o ./tmp/main.exe ./example"
   delay = 1000
   exclude_dir = ["assets", "tmp", "vendor", "testdata", "runtime/out", "node_modules", "dist"]
   exclude_file = []
diff --git a/example/index.html b/example/index.html
index af6d2e8..f686e39 100644
--- a/example/index.html
+++ b/example/index.html
@@ -4,7 +4,8 @@
         <button onclick="greet()">Greet</button>
         <button onclick="file()">Read File</button>
         <button onclick="directory()">List Directory</button>
-        
+        <button onclick="notify()">Notify</button>
+
         <script>
             function greet() {
                 tiramisu.invoke("hello", "world")
@@ -27,6 +28,14 @@
                     .then(files => alert("Files: " + files.join(", ")))
                     .catch(error => alert("Error listing directory: " + error.message));
             }
+
+            function notify() {
+                const message = prompt("Enter the notification message:");
+                if (!message) return;
+                tiramisu.notifications.notify(message)
+                    .then(() => alert("Notification sent!"))
+                    .catch(error => alert("Error sending notification: " + error.message));
+            }
         </script>
     </body>
 </html>
\ No newline at end of file
diff --git a/go.mod b/go.mod
index ccab6aa..2d18392 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,18 @@ module git.iwakura.rip/grng/tiramisu
 
 go 1.23.4
 
-require github.com/webview/webview_go v0.0.0-20240831120633-6173450d4dd6 // indirect
+require (
+	git.sr.ht/~jackmordaunt/go-toast v1.1.2 // indirect
+	github.com/electricbubble/go-toast v0.3.0 // indirect
+	github.com/esiqveland/notify v0.13.3 // indirect
+	github.com/gen2brain/beeep v0.11.1 // indirect
+	github.com/go-ole/go-ole v1.3.0 // indirect
+	github.com/godbus/dbus/v5 v5.1.0 // indirect
+	github.com/jackmordaunt/icns/v3 v3.0.1 // indirect
+	github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 // indirect
+	github.com/sergeymakinen/go-bmp v1.0.0 // indirect
+	github.com/sergeymakinen/go-ico v1.0.0-beta.0 // indirect
+	github.com/tadvi/systray v0.0.0-20190226123456-11a2b8fa57af // indirect
+	github.com/webview/webview_go v0.0.0-20240831120633-6173450d4dd6 // indirect
+	golang.org/x/sys v0.33.0 // indirect
+)
diff --git a/go.sum b/go.sum
index 2421e19..1f8ff6c 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,39 @@
+git.sr.ht/~jackmordaunt/go-toast v1.1.2 h1:/yrfI55LRt1M7H1vkaw+NaH1+L1CDxrqDltwm5euVuE=
+git.sr.ht/~jackmordaunt/go-toast v1.1.2/go.mod h1:jA4OqHKTQ4AFBdwrSnwnskUIIS3HYzlJSgdzCKqfavo=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/electricbubble/go-toast v0.3.0 h1:e/PtFkpYNdLANI/utTXzoYQuMYG/N8oHT0Rwal4z/sI=
+github.com/electricbubble/go-toast v0.3.0/go.mod h1:6k4ufXmV/AS32EugdLeIXa+2jv6oYbWzv2+UZhB49FI=
+github.com/esiqveland/notify v0.13.3 h1:QCMw6o1n+6rl+oLUfg8P1IIDSFsDEb2WlXvVvIJbI/o=
+github.com/esiqveland/notify v0.13.3/go.mod h1:hesw/IRYTO0x99u1JPweAl4+5mwXJibQVUcP0Iu5ORE=
+github.com/gen2brain/beeep v0.11.1 h1:EbSIhrQZFDj1K2fzlMpAYlFOzV8YuNe721A58XcCTYI=
+github.com/gen2brain/beeep v0.11.1/go.mod h1:jQVvuwnLuwOcdctHn/uyh8horSBNJ8uGb9Cn2W4tvoc=
+github.com/go-ole/go-ole v1.3.0 h1:Dt6ye7+vXGIKZ7Xtk4s6/xVdGDQynvom7xCFEdWr6uE=
+github.com/go-ole/go-ole v1.3.0/go.mod h1:5LS6F96DhAwUc7C+1HLexzMXY1xGRSryjyPPKW6zv78=
+github.com/godbus/dbus/v5 v5.1.0 h1:4KLkAxT3aOY8Li4FRJe/KvhoNFFxo0m6fNuFUO8QJUk=
+github.com/godbus/dbus/v5 v5.1.0/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
+github.com/jackmordaunt/icns/v3 v3.0.1 h1:xxot6aNuGrU+lNgxz5I5H0qSeCjNKp8uTXB1j8D4S3o=
+github.com/jackmordaunt/icns/v3 v3.0.1/go.mod h1:5sHL59nqTd2ynTnowxB/MDQFhKNqkK8X687uKNygaSQ=
+github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 h1:zYyBkD/k9seD2A7fsi6Oo2LfFZAehjjQMERAvZLEDnQ=
+github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646/go.mod h1:jpp1/29i3P1S/RLdc7JQKbRpFeM1dOBd8T9ki5s+AY8=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/sergeymakinen/go-bmp v1.0.0 h1:SdGTzp9WvCV0A1V0mBeaS7kQAwNLdVJbmHlqNWq0R+M=
+github.com/sergeymakinen/go-bmp v1.0.0/go.mod h1:/mxlAQZRLxSvJFNIEGGLBE/m40f3ZnUifpgVDlcUIEY=
+github.com/sergeymakinen/go-ico v1.0.0-beta.0 h1:m5qKH7uPKLdrygMWxbamVn+tl2HfiA3K6MFJw4GfZvQ=
+github.com/sergeymakinen/go-ico v1.0.0-beta.0/go.mod h1:wQ47mTczswBO5F0NoDt7O0IXgnV4Xy3ojrroMQzyhUk=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
+github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+github.com/tadvi/systray v0.0.0-20190226123456-11a2b8fa57af h1:6yITBqGTE2lEeTPG04SN9W+iWHCRyHqlVYILiSXziwk=
+github.com/tadvi/systray v0.0.0-20190226123456-11a2b8fa57af/go.mod h1:4F09kP5F+am0jAwlQLddpoMDM+iewkxxt6nxUQ5nq5o=
 github.com/webview/webview_go v0.0.0-20240831120633-6173450d4dd6 h1:VQpB2SpK88C6B5lPHTuSZKb2Qee1QWwiFlC5CKY4AW0=
 github.com/webview/webview_go v0.0.0-20240831120633-6173450d4dd6/go.mod h1:yE65LFCeWf4kyWD5re+h4XNvOHJEXOCOuJZ4v8l5sgk=
+golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.33.0 h1:q3i8TbbEz+JRD9ywIRlyRAQbM0qF7hu24q3teo2hbuw=
+golang.org/x/sys v0.33.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/runtime/index.d.ts b/runtime/index.d.ts
index a6fe80f..5193826 100644
--- a/runtime/index.d.ts
+++ b/runtime/index.d.ts
@@ -1,14 +1,25 @@
 declare global {
     interface Window {
+        // internal
         __TIRAMISU_INTERNAL_invoke: (name: string, ...args: any[]) => Promise<any>;
-        __TIRAMISU_INTERNAL_readFile: (path: string) => Promise<string>;
-        __TIRAMISU_INTERNAL_readDir: (path: string) => Promise<string[]>;
+
+        // filesystem
+        __TIRAMISU_FILESYSTEM_readFile: (path: string) => Promise<string>;
+        __TIRAMISU_FILESYSTEM_readDir: (path: string) => Promise<string[]>;
+        __TIRAMISU_INTERNAL_exists: (path: string) => Promise<boolean>;
+
+        // notifications
+        __TIRAMISU_NOTIFICATIONS_notify: (message: string, ico?: string) => Promise<void>;
 
         tiramisu: {
             invoke: (name: string, ...args: any[]) => Promise<any>;
             fs: {
                 readFile(path: string): Promise<string>;
                 readDir(path: string): Promise<string[]>;
+                exists(path: string): Promise<boolean>;
+            },
+            notifications: {
+                notify(message: string, ico?: string): Promise<void>;
             }
         };
     }
diff --git a/runtime/preload.ts b/runtime/preload.ts
index ec9dad9..dd3e5be 100644
--- a/runtime/preload.ts
+++ b/runtime/preload.ts
@@ -1,9 +1,13 @@
 const tiramisu = {
     invoke: window.__TIRAMISU_INTERNAL_invoke,
     fs: {
-        readFile: window.__TIRAMISU_INTERNAL_readFile,
-        readDir: window.__TIRAMISU_INTERNAL_readDir
-    }
+        readFile: window.__TIRAMISU_FILESYSTEM_readFile,
+        readDir: window.__TIRAMISU_FILESYSTEM_readDir,
+        exists: window.__TIRAMISU_INTERNAL_exists,
+    },
+    notifications: {
+        notify: window.__TIRAMISU_NOTIFICATIONS_notify,
+    },
 }
 
 window.tiramisu = tiramisu
\ No newline at end of file
diff --git a/tiramisu.go b/tiramisu.go
index a2c0173..3292cc5 100644
--- a/tiramisu.go
+++ b/tiramisu.go
@@ -2,9 +2,11 @@ package tiramisu
 
 import (
 	"embed"
+	"encoding/json"
 	"fmt"
 	"os"
 
+	toast "github.com/electricbubble/go-toast"
 	wv "github.com/webview/webview_go"
 )
 
@@ -19,6 +21,7 @@ type TiramisuOptions struct {
 type FuncHandler func(args ...any) (any, error)
 
 type Tiramisu struct {
+	o     TiramisuOptions
 	w     wv.WebView
 	funcs map[string]FuncHandler
 }
@@ -29,6 +32,7 @@ func New(o TiramisuOptions) *Tiramisu {
 	w.SetTitle(o.Title)
 
 	t := &Tiramisu{
+		o:     o,
 		w:     w,
 		funcs: make(map[string]FuncHandler),
 	}
@@ -104,27 +108,25 @@ func (t *Tiramisu) loadJSRuntime() {
 }
 
 func (t *Tiramisu) loadGoRuntime() {
+	// internal
 	t.bind("__TIRAMISU_INTERNAL_invoke", func(args ...any) (any, error) {
-		name, ok := args[0].(string)
-		if !ok {
-			return nil, fmt.Errorf("first argument must be a string, got %T", args[0])
+		name, err := ArgAs[string](args, 0)
+		if err != nil {
+			return nil, err
 		}
+		// pass through any extra args
 		if len(args) == 1 {
 			return t.invoke(name)
 		}
 		return t.invoke(name, args[1:]...)
 	})
 
-	t.bind("__TIRAMISU_INTERNAL_readFile", func(args ...any) (any, error) {
-		if len(args) != 1 {
-			return nil, fmt.Errorf("readFile expects exactly one argument, got %d", len(args))
+	// filesystem
+	t.bind("__TIRAMISU_FILESYSTEM_readFile", func(args ...any) (any, error) {
+		filename, err := ArgAs[string](args, 0)
+		if err != nil {
+			return nil, err
 		}
-
-		filename, ok := args[0].(string)
-		if !ok {
-			return nil, fmt.Errorf("readFile expects a string argument, got %T", args[0])
-		}
-
 		data, err := os.ReadFile(filename)
 		if err != nil {
 			return nil, fmt.Errorf("error reading file %s: %w", filename, err)
@@ -132,25 +134,76 @@ func (t *Tiramisu) loadGoRuntime() {
 		return string(data), nil
 	})
 
-	t.bind("__TIRAMISU_INTERNAL_readDir", func(args ...any) (any, error) {
-		if len(args) != 1 {
-			return nil, fmt.Errorf("readDir expects exactly one argument, got %d", len(args))
+	t.bind("__TIRAMISU_FILESYSTEM_readDir", func(args ...any) (any, error) {
+		dirname, err := ArgAs[string](args, 0)
+		if err != nil {
+			return nil, err
 		}
-
-		dirname, ok := args[0].(string)
-		if !ok {
-			return nil, fmt.Errorf("readDir expects a string argument, got %T", args[0])
-		}
-
-		files, err := os.ReadDir(dirname)
+		entries, err := os.ReadDir(dirname)
 		if err != nil {
 			return nil, fmt.Errorf("error reading directory %s: %w", dirname, err)
 		}
-
-		var fileNames []string
-		for _, file := range files {
-			fileNames = append(fileNames, file.Name())
+		var names []string
+		for _, e := range entries {
+			names = append(names, e.Name())
 		}
-		return fileNames, nil
+		return names, nil
+	})
+
+	t.bind("__TIRAMISU_INTERNAL_exists", func(args ...any) (any, error) {
+		path, err := ArgAs[string](args, 0)
+		if err != nil {
+			return nil, err
+		}
+		_, err = os.Stat(path)
+		if err != nil {
+			if os.IsNotExist(err) {
+				return false, nil
+			}
+			return nil, fmt.Errorf("error checking existence of %s: %w", path, err)
+		}
+		return true, nil
+	})
+
+	// notifications
+	t.bind("__TIRAMISU_NOTIFICATIONS_notify", func(args ...any) (any, error) {
+		msg, err := ArgAs[string](args, 0)
+		if err != nil {
+			return nil, err
+		}
+		if err := toast.Push(msg); err != nil {
+			return nil, fmt.Errorf("error sending notification: %w", err)
+		}
+
+		return nil, nil
 	})
 }
+
+func Arg(args []any, i int) (any, error) {
+	if i < 0 || i >= len(args) {
+		return nil, fmt.Errorf("arg %d out of range [0..%d]", i, len(args)-1)
+	}
+	return args[i], nil
+}
+
+func ArgAs[T any](args []any, i int) (T, error) {
+	var t T
+
+	arg, err := Arg(args, i)
+	if err != nil {
+		return t, err
+	}
+
+	if v, ok := arg.(T); ok {
+		return v, nil
+	}
+
+	j, err := json.Marshal(arg)
+	if err != nil {
+		return t, fmt.Errorf("cannot marshal arg[%d]: %w", i, err)
+	}
+	if err := json.Unmarshal(j, &t); err != nil {
+		return t, fmt.Errorf("cannot unmarshal arg[%d] -> %T: %w", i, t, err)
+	}
+	return t, nil
+}