diff --git a/.gitignore b/.gitignore
index df65af5..58099d2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 .claude/
 CLAUDE.md
+.pi/
 
 # Test and coverage
 coverage.out
diff --git a/exprenv_test.go b/exprenv_test.go
index 2e3cb29..e10366e 100644
--- a/exprenv_test.go
+++ b/exprenv_test.go
@@ -30,9 +30,15 @@ func TestArgExprEnv_JSONSerialization(t *testing.T) {
 	t.Parallel()
 
 	env := zapscript.ArgExprEnv{
-		Platform: "mister",
-		Version:  "2.0.0",
-		ScanMode: "hold",
+		Platform:     "mister",
+		Version:      "2.0.0",
+		ScanMode:     "hold",
+		MediaPlaying: true,
+		MediaReady:   true,
+		Hook: zapscript.ExprEnvHook{
+			Name:           "startup",
+			FirstBootStart: true,
+		},
 		Device: zapscript.ExprEnvDevice{
 			Hostname: "mister",
 			OS:       "linux",
@@ -43,7 +49,6 @@ func TestArgExprEnv_JSONSerialization(t *testing.T) {
 			Value: "**launch:snes/mario",
 			Data:  "extra-data",
 		},
-		MediaPlaying: true,
 		ActiveMedia: zapscript.ExprEnvActiveMedia{
 			LauncherID: "retroarch",
 			SystemID:   "snes",
@@ -63,6 +68,9 @@ func TestArgExprEnv_JSONSerialization(t *testing.T) {
 	assert.Contains(t, jsonStr, `"version"`, "should contain version field")
 	assert.Contains(t, jsonStr, `"scan_mode"`, "should contain scan_mode field")
 	assert.Contains(t, jsonStr, `"media_playing"`, "should contain media_playing field")
+	assert.Contains(t, jsonStr, `"media_ready"`, "should contain media_ready field")
+	assert.Contains(t, jsonStr, `"hook"`, "should contain hook field")
+	assert.Contains(t, jsonStr, `"first_boot_start"`, "should contain first_boot_start field")
 	assert.Contains(t, jsonStr, `"active_media"`, "should contain active_media field")
 	assert.Contains(t, jsonStr, `"last_scanned"`, "should contain last_scanned field")
 	assert.Contains(t, jsonStr, `"launcher_id"`, "should contain launcher_id field")
@@ -85,6 +93,11 @@ func TestArgExprEnv_JSONRoundTrip(t *testing.T) {
 		Version:      "1.0.0",
 		ScanMode:     "tap",
 		MediaPlaying: true,
+		MediaReady:   true,
+		Hook: zapscript.ExprEnvHook{
+			Name:           "startup",
+			FirstBootStart: true,
+		},
 		Device: zapscript.ExprEnvDevice{
 			Hostname: "testhost",
 			OS:       "linux",
@@ -115,6 +128,9 @@ func TestArgExprEnv_JSONRoundTrip(t *testing.T) {
 	assert.Equal(t, original.Version, decoded.Version)
 	assert.Equal(t, original.ScanMode, decoded.ScanMode)
 	assert.Equal(t, original.MediaPlaying, decoded.MediaPlaying)
+	assert.Equal(t, original.MediaReady, decoded.MediaReady)
+	assert.Equal(t, original.Hook.Name, decoded.Hook.Name)
+	assert.Equal(t, original.Hook.FirstBootStart, decoded.Hook.FirstBootStart)
 	assert.Equal(t, original.Device.Hostname, decoded.Device.Hostname)
 	assert.Equal(t, original.LastScanned.ID, decoded.LastScanned.ID)
 	assert.Equal(t, original.ActiveMedia.Path, decoded.ActiveMedia.Path)
@@ -158,6 +174,22 @@ func TestExprEnvLaunching_JSONSerialization(t *testing.T) {
 	assert.Contains(t, jsonStr, `"launcher_id"`)
 }
 
+func TestExprEnvHook_JSONSerialization(t *testing.T) {
+	t.Parallel()
+
+	hook := zapscript.ExprEnvHook{
+		Name:           "startup",
+		FirstBootStart: true,
+	}
+
+	jsonBytes, err := json.Marshal(hook)
+	require.NoError(t, err)
+
+	jsonStr := string(jsonBytes)
+	assert.Contains(t, jsonStr, `"name"`)
+	assert.Contains(t, jsonStr, `"first_boot_start"`)
+}
+
 // TestArgExprEnv_EmptyFieldsSerialization verifies that empty struct fields are serialized
 // (no omitempty behavior) for consistent JSON structure in external scripts.
 func TestArgExprEnv_EmptyFieldsSerialization(t *testing.T) {
diff --git a/expressions.go b/expressions.go
index 483938a..5aabcac 100644
--- a/expressions.go
+++ b/expressions.go
@@ -61,6 +61,14 @@ type ExprEnvLaunching struct {
 	LauncherID string `expr:"launcher_id" json:"launcher_id"`
 }
 
+// ExprEnvHook represents hook context for expression evaluation.
+//
+//nolint:tagliatelle // JSON uses snake_case to match expression env naming
+type ExprEnvHook struct {
+	Name           string `expr:"name" json:"name"`
+	FirstBootStart bool   `expr:"first_boot_start" json:"first_boot_start"`
+}
+
 //nolint:tagliatelle // JSON uses snake_case to match expression env naming
 type ArgExprEnv struct {
 	ActiveMedia  ExprEnvActiveMedia `expr:"active_media" json:"active_media"`
@@ -71,7 +79,9 @@ type ArgExprEnv struct {
 	Platform     string             `expr:"platform" json:"platform"`
 	Version      string             `expr:"version" json:"version"`
 	ScanMode     string             `expr:"scan_mode" json:"scan_mode"`
+	Hook         ExprEnvHook        `expr:"hook" json:"hook,omitempty"`
 	MediaPlaying bool               `expr:"media_playing" json:"media_playing"`
+	MediaReady   bool               `expr:"media_ready" json:"media_ready"`
 }
 
 //nolint:tagliatelle // JSON uses snake_case to match expression env naming
diff --git a/parser_test.go b/parser_test.go
index f7c6d2f..352b109 100644
--- a/parser_test.go
+++ b/parser_test.go
@@ -398,6 +398,21 @@ func TestPostProcess(t *testing.T) {
 			input: "something " + zapscript.TokExpStart + "true" + zapscript.TokExprEnd,
 			want:  `something true`,
 		},
+		{
+			name:  "test expression hook name",
+			input: zapscript.TokExpStart + "hook.name" + zapscript.TokExprEnd,
+			want:  `startup`,
+		},
+		{
+			name:  "test expression hook first boot start",
+			input: zapscript.TokExpStart + "hook.first_boot_start" + zapscript.TokExprEnd,
+			want:  `true`,
+		},
+		{
+			name:  "test expression media ready",
+			input: zapscript.TokExpStart + "media_ready" + zapscript.TokExprEnd,
+			want:  `true`,
+		},
 		{
 			name:    "bad return type",
 			input:   zapscript.TokExpStart + "device" + zapscript.TokExprEnd,
@@ -422,7 +437,12 @@ func TestPostProcess(t *testing.T) {
 				Platform:     "mister",
 				Version:      "1.2.3",
 				MediaPlaying: true,
+				MediaReady:   true,
 				ScanMode:     "tap",
+				Hook: zapscript.ExprEnvHook{
+					Name:           "startup",
+					FirstBootStart: true,
+				},
 				Device: zapscript.ExprEnvDevice{
 					Hostname: "test-device",
 					OS:       "linux",