diff --git a/src/Surface.zig b/src/Surface.zig
index 309294e61..029a1b221 100644
--- a/src/Surface.zig
+++ b/src/Surface.zig
@@ -841,7 +841,7 @@ fn passwordInput(self: *Surface, v: bool) !void {
     self.rt_app.performAction(
         .{ .surface = self },
         .secure_input,
-        v,
+        if (v) .on else .off,
     ) catch |err| {
         // We ignore this error because we don't want to fail this
         // entire operation just because the apprt failed to set
@@ -3685,44 +3685,55 @@ pub fn performBindingAction(self: *Surface, action: input.Binding.Action) !bool
             },
         ),
 
-        .new_split => |direction| {
-            if (@hasDecl(apprt.Surface, "newSplit")) {
-                try self.rt_surface.newSplit(switch (direction) {
-                    .right => .right,
-                    .down => .down,
-                    .auto => if (self.screen_size.width > self.screen_size.height)
-                        .right
-                    else
-                        .down,
-                });
-            } else log.warn("runtime doesn't implement newSplit", .{});
-        },
+        .new_split => |direction| try self.rt_app.performAction(
+            .{ .surface = self },
+            .new_split,
+            switch (direction) {
+                .right => .right,
+                .down => .down,
+                .auto => if (self.screen_size.width > self.screen_size.height)
+                    .right
+                else
+                    .down,
+            },
+        ),
 
-        .goto_split => |direction| {
-            if (@hasDecl(apprt.Surface, "gotoSplit")) {
-                self.rt_surface.gotoSplit(direction);
-            } else log.warn("runtime doesn't implement gotoSplit", .{});
-        },
+        .goto_split => |direction| try self.rt_app.performAction(
+            .{ .surface = self },
+            .goto_split,
+            switch (direction) {
+                inline else => |tag| @field(
+                    apprt.action.GotoSplit,
+                    @tagName(tag),
+                ),
+            },
+        ),
 
-        .resize_split => |param| {
-            if (@hasDecl(apprt.Surface, "resizeSplit")) {
-                const direction = param[0];
-                const amount = param[1];
-                self.rt_surface.resizeSplit(direction, amount);
-            } else log.warn("runtime doesn't implement resizeSplit", .{});
-        },
+        .resize_split => |value| try self.rt_app.performAction(
+            .{ .surface = self },
+            .resize_split,
+            .{
+                .amount = value[1],
+                .direction = switch (value[0]) {
+                    inline else => |tag| @field(
+                        apprt.action.ResizeSplit.Direction,
+                        @tagName(tag),
+                    ),
+                },
+            },
+        ),
 
-        .equalize_splits => {
-            if (@hasDecl(apprt.Surface, "equalizeSplits")) {
-                self.rt_surface.equalizeSplits();
-            } else log.warn("runtime doesn't implement equalizeSplits", .{});
-        },
+        .equalize_splits => try self.rt_app.performAction(
+            .{ .surface = self },
+            .equalize_splits,
+            {},
+        ),
 
-        .toggle_split_zoom => {
-            if (@hasDecl(apprt.Surface, "toggleSplitZoom")) {
-                self.rt_surface.toggleSplitZoom();
-            } else log.warn("runtime doesn't implement toggleSplitZoom", .{});
-        },
+        .toggle_split_zoom => try self.rt_app.performAction(
+            .{ .surface = self },
+            .toggle_split_zoom,
+            {},
+        ),
 
         .toggle_fullscreen => {
             if (@hasDecl(apprt.Surface, "toggleFullscreen")) {
@@ -3730,17 +3741,17 @@ pub fn performBindingAction(self: *Surface, action: input.Binding.Action) !bool
             } else log.warn("runtime doesn't implement toggleFullscreen", .{});
         },
 
-        .toggle_window_decorations => {
-            if (@hasDecl(apprt.Surface, "toggleWindowDecorations")) {
-                self.rt_surface.toggleWindowDecorations();
-            } else log.warn("runtime doesn't implement toggleWindowDecorations", .{});
-        },
+        .toggle_window_decorations => try self.rt_app.performAction(
+            .{ .surface = self },
+            .toggle_window_decorations,
+            {},
+        ),
 
-        .toggle_secure_input => {
-            if (@hasDecl(apprt.Surface, "toggleSecureInput")) {
-                self.rt_surface.toggleSecureInput();
-            } else log.warn("runtime doesn't implement toggleSecureInput", .{});
-        },
+        .toggle_secure_input => try self.rt_app.performAction(
+            .{ .surface = self },
+            .secure_input,
+            .toggle,
+        ),
 
         .select_all => {
             const sel = self.io.terminal.screen.selectAll();
diff --git a/src/apprt.zig b/src/apprt.zig
index 21a0e7805..7651ace9b 100644
--- a/src/apprt.zig
+++ b/src/apprt.zig
@@ -32,10 +32,8 @@ pub const ClipboardRequestType = structs.ClipboardRequestType;
 pub const ColorScheme = structs.ColorScheme;
 pub const CursorPos = structs.CursorPos;
 pub const DesktopNotification = structs.DesktopNotification;
-pub const GotoTab = structs.GotoTab;
 pub const IMEPos = structs.IMEPos;
 pub const Selection = structs.Selection;
-pub const SplitDirection = structs.SplitDirection;
 pub const SurfaceSize = structs.SurfaceSize;
 
 /// The implementation to use for the app runtime. This is comptime chosen
diff --git a/src/apprt/action.zig b/src/apprt/action.zig
index 3f34ae8d8..72f0aadd5 100644
--- a/src/apprt/action.zig
+++ b/src/apprt/action.zig
@@ -21,12 +21,32 @@ pub const Action = union(enum) {
     /// the tab should be opened in a new window.
     new_tab,
 
+    /// Create a new split. The value determines the location of the split
+    /// relative to the target.
+    new_split: SplitDirection,
+
+    /// Close all open windows.
+    close_all_windows,
+
+    /// Toggle whether window directions are shown.
+    toggle_window_decorations,
+
     /// Jump to a specific tab. Must handle the scenario that the tab
     /// value is invalid.
     goto_tab: GotoTab,
 
-    /// Close all open windows.
-    close_all_windows,
+    /// Jump to a specific split.
+    goto_split: GotoSplit,
+
+    /// Resize the split in the given direction.
+    resize_split: ResizeSplit,
+
+    /// Equalize all the splits in the target window.
+    equalize_splits,
+
+    /// Toggle whether a split is zoomed or not. A zoomed split is resized
+    /// to take up the entire window.
+    toggle_split_zoom,
 
     /// Open the Ghostty configuration. This is platform-specific about
     /// what it means; it can mean opening a dedicated UI or just opening
@@ -44,7 +64,7 @@ pub const Action = union(enum) {
     /// entering a password or other sensitive information. This can be used
     /// by the app runtime to change the appearance of the cursor, setup
     /// system APIs to not log the input, etc.
-    secure_input: bool,
+    secure_input: SecureInput,
 
     /// The enum of keys in the tagged union.
     pub const Key = @typeInfo(Action).Union.tag_type.?;
@@ -68,6 +88,38 @@ pub const Target = union(enum) {
     surface: *CoreSurface,
 };
 
+// This is made extern (c_int) to make interop easier with our embedded
+// runtime. The small size cost doesn't make a difference in our union.
+pub const SplitDirection = enum(c_int) {
+    right,
+    down,
+};
+
+// This is made extern (c_int) to make interop easier with our embedded
+// runtime. The small size cost doesn't make a difference in our union.
+pub const GotoSplit = enum(c_int) {
+    previous,
+    next,
+
+    top,
+    left,
+    bottom,
+    right,
+};
+
+/// The amount to resize the split by and the direction to resize it in.
+pub const ResizeSplit = struct {
+    amount: u16,
+    direction: Direction,
+
+    pub const Direction = enum(c_int) {
+        up,
+        down,
+        left,
+        right,
+    };
+};
+
 /// The tab to jump to. This is non-exhaustive so that integer values represent
 /// the index (zero-based) of the tab to jump to. Negative values are special
 /// values.
@@ -77,3 +129,9 @@ pub const GotoTab = enum(c_int) {
     last = -3,
     _,
 };
+
+pub const SecureInput = enum(c_int) {
+    on,
+    off,
+    toggle,
+};
diff --git a/src/apprt/embedded.zig b/src/apprt/embedded.zig
index 8c602b5b0..a0e4230be 100644
--- a/src/apprt/embedded.zig
+++ b/src/apprt/embedded.zig
@@ -81,7 +81,7 @@ pub const App = struct {
 
         /// Create a new split view. If the embedder doesn't support split
         /// views then this can be null.
-        new_split: ?*const fn (SurfaceUD, apprt.SplitDirection, apprt.Surface.Options) callconv(.C) void = null,
+        new_split: ?*const fn (SurfaceUD, apprt.action.SplitDirection, apprt.Surface.Options) callconv(.C) void = null,
 
         /// New tab with options. The surface may be null if there is no target
         /// surface in which case the apprt is expected to create a new window.
@@ -98,10 +98,10 @@ pub const App = struct {
         close_surface: ?*const fn (SurfaceUD, bool) callconv(.C) void = null,
 
         /// Focus the previous/next split (if any).
-        focus_split: ?*const fn (SurfaceUD, input.SplitFocusDirection) callconv(.C) void = null,
+        focus_split: ?*const fn (SurfaceUD, apprt.action.GotoSplit) callconv(.C) void = null,
 
         /// Resize the current split.
-        resize_split: ?*const fn (SurfaceUD, input.SplitResizeDirection, u16) callconv(.C) void = null,
+        resize_split: ?*const fn (SurfaceUD, apprt.action.ResizeSplit.Direction, u16) callconv(.C) void = null,
 
         /// Equalize all splits in the current window
         equalize_splits: ?*const fn (SurfaceUD) callconv(.C) void = null,
@@ -534,16 +534,113 @@ pub const App = struct {
         }
     }
 
-    fn setPasswordInput(self: *App, target: apprt.Target, v: bool) void {
-        const func = self.opts.set_password_input orelse {
-            log.info("runtime embedder does not support set_password_input", .{});
+    fn newSplit(
+        self: *const App,
+        target: apprt.Target,
+        direction: apprt.action.SplitDirection,
+    ) void {
+        const func = self.opts.new_split orelse {
+            log.info("runtime embedder does not support splits", .{});
             return;
         };
 
-        func(switch (target) {
-            .app => null,
-            .surface => |surface| surface.rt_surface.userdata,
-        }, v);
+        switch (target) {
+            .app => func(null, direction, .{}),
+            .surface => |v| func(
+                v.rt_surface.userdata,
+                direction,
+                v.rt_surface.newSurfaceOptions(),
+            ),
+        }
+    }
+
+    fn gotoSplit(
+        self: *const App,
+        target: apprt.Target,
+        direction: apprt.action.GotoSplit,
+    ) void {
+        const func = self.opts.focus_split orelse {
+            log.info("runtime embedder does not support focus split", .{});
+            return;
+        };
+
+        switch (target) {
+            .app => {},
+            .surface => |v| func(v.rt_surface.userdata, direction),
+        }
+    }
+
+    fn resizeSplit(
+        self: *const App,
+        target: apprt.Target,
+        resize: apprt.action.ResizeSplit,
+    ) void {
+        const func = self.opts.resize_split orelse {
+            log.info("runtime embedder does not support resize split", .{});
+            return;
+        };
+
+        switch (target) {
+            .app => {},
+            .surface => |v| func(
+                v.rt_surface.userdata,
+                resize.direction,
+                resize.amount,
+            ),
+        }
+    }
+
+    pub fn equalizeSplits(self: *const App, target: apprt.Target) void {
+        const func = self.opts.equalize_splits orelse {
+            log.info("runtime embedder does not support equalize splits", .{});
+            return;
+        };
+
+        switch (target) {
+            .app => func(null),
+            .surface => |v| func(v.rt_surface.userdata),
+        }
+    }
+
+    fn toggleSplitZoom(self: *const App, target: apprt.Target) void {
+        const func = self.opts.toggle_split_zoom orelse {
+            log.info("runtime embedder does not support split zoom", .{});
+            return;
+        };
+
+        switch (target) {
+            .app => func(null),
+            .surface => |v| func(v.rt_surface.userdata),
+        }
+    }
+
+    fn setPasswordInput(self: *App, target: apprt.Target, v: apprt.action.SecureInput) void {
+        switch (v) {
+            inline .on, .off => |tag| {
+                const func = self.opts.set_password_input orelse {
+                    log.info("runtime embedder does not support set_password_input", .{});
+                    return;
+                };
+
+                func(switch (target) {
+                    .app => null,
+                    .surface => |surface| surface.rt_surface.userdata,
+                }, switch (tag) {
+                    .on => true,
+                    .off => false,
+                    else => comptime unreachable,
+                });
+            },
+
+            .toggle => {
+                const func = self.opts.toggle_secure_input orelse {
+                    log.info("runtime embedder does not support toggle_secure_input", .{});
+                    return;
+                };
+
+                func();
+            },
+        }
     }
 
     /// Perform a given action.
@@ -561,11 +658,17 @@ pub const App = struct {
 
             .new_tab => self.newTab(target),
             .goto_tab => self.gotoTab(target, value),
+            .new_split => self.newSplit(target, value),
+            .resize_split => self.resizeSplit(target, value),
+            .equalize_splits => self.equalizeSplits(target),
+            .toggle_split_zoom => self.toggleSplitZoom(target),
+            .goto_split => self.gotoSplit(target, value),
             .open_config => try configpkg.edit.open(self.core_app.alloc),
             .secure_input => self.setPasswordInput(target, value),
 
             // Unimplemented
             .close_all_windows,
+            .toggle_window_decorations,
             .quit_timer,
             => log.warn("unimplemented action={}", .{action}),
         }
@@ -795,16 +898,6 @@ pub const Surface = struct {
         func(self.userdata, mode);
     }
 
-    pub fn newSplit(self: *const Surface, direction: apprt.SplitDirection) !void {
-        const func = self.app.opts.new_split orelse {
-            log.info("runtime embedder does not support splits", .{});
-            return;
-        };
-
-        const options = self.newSurfaceOptions();
-        func(self.userdata, direction, options);
-    }
-
     pub fn close(self: *const Surface, process_alive: bool) void {
         const func = self.app.opts.close_surface orelse {
             log.info("runtime embedder does not support closing a surface", .{});
@@ -814,42 +907,6 @@ pub const Surface = struct {
         func(self.userdata, process_alive);
     }
 
-    pub fn gotoSplit(self: *const Surface, direction: input.SplitFocusDirection) void {
-        const func = self.app.opts.focus_split orelse {
-            log.info("runtime embedder does not support focus split", .{});
-            return;
-        };
-
-        func(self.userdata, direction);
-    }
-
-    pub fn resizeSplit(self: *const Surface, direction: input.SplitResizeDirection, amount: u16) void {
-        const func = self.app.opts.resize_split orelse {
-            log.info("runtime embedder does not support resize split", .{});
-            return;
-        };
-
-        func(self.userdata, direction, amount);
-    }
-
-    pub fn equalizeSplits(self: *const Surface) void {
-        const func = self.app.opts.equalize_splits orelse {
-            log.info("runtime embedder does not support equalize splits", .{});
-            return;
-        };
-
-        func(self.userdata);
-    }
-
-    pub fn toggleSplitZoom(self: *const Surface) void {
-        const func = self.app.opts.toggle_split_zoom orelse {
-            log.info("runtime embedder does not support split zoom", .{});
-            return;
-        };
-
-        func(self.userdata);
-    }
-
     pub fn getContentScale(self: *const Surface) !apprt.ContentScale {
         return self.content_scale;
     }
@@ -1137,15 +1194,6 @@ pub const Surface = struct {
         func(self.userdata, nonNativeFullscreen);
     }
 
-    pub fn toggleSecureInput(self: *Surface) void {
-        const func = self.app.opts.toggle_secure_input orelse {
-            log.info("runtime embedder does not toggle_secure_input", .{});
-            return;
-        };
-
-        func();
-    }
-
     fn newWindow(self: *const Surface) !void {
         const func = self.app.opts.new_window orelse {
             log.info("runtime embedder does not support new_window", .{});
@@ -1899,26 +1947,61 @@ pub const CAPI = struct {
     }
 
     /// Request that the surface split in the given direction.
-    export fn ghostty_surface_split(ptr: *Surface, direction: apprt.SplitDirection) void {
-        ptr.newSplit(direction) catch {};
+    export fn ghostty_surface_split(ptr: *Surface, direction: apprt.action.SplitDirection) void {
+        ptr.app.performAction(
+            .{ .surface = &ptr.core_surface },
+            .new_split,
+            direction,
+        ) catch |err| {
+            log.err("error creating new split err={}", .{err});
+            return;
+        };
     }
 
     /// Focus on the next split (if any).
-    export fn ghostty_surface_split_focus(ptr: *Surface, direction: input.SplitFocusDirection) void {
-        ptr.gotoSplit(direction);
+    export fn ghostty_surface_split_focus(
+        ptr: *Surface,
+        direction: apprt.action.GotoSplit,
+    ) void {
+        ptr.app.performAction(
+            .{ .surface = &ptr.core_surface },
+            .goto_split,
+            direction,
+        ) catch |err| {
+            log.err("error creating new split err={}", .{err});
+            return;
+        };
     }
 
     /// Resize the current split by moving the split divider in the given
     /// direction. `direction` specifies which direction the split divider will
     /// move relative to the focused split. `amount` is a fractional value
     /// between 0 and 1 that specifies by how much the divider will move.
-    export fn ghostty_surface_split_resize(ptr: *Surface, direction: input.SplitResizeDirection, amount: u16) void {
-        ptr.resizeSplit(direction, amount);
+    export fn ghostty_surface_split_resize(
+        ptr: *Surface,
+        direction: apprt.action.ResizeSplit.Direction,
+        amount: u16,
+    ) void {
+        ptr.app.performAction(
+            .{ .surface = &ptr.core_surface },
+            .resize_split,
+            .{ .direction = direction, .amount = amount },
+        ) catch |err| {
+            log.err("error resizing split err={}", .{err});
+            return;
+        };
     }
 
     /// Equalize the size of all splits in the current window.
     export fn ghostty_surface_split_equalize(ptr: *Surface) void {
-        ptr.equalizeSplits();
+        ptr.app.performAction(
+            .{ .surface = &ptr.core_surface },
+            .equalize_splits,
+            {},
+        ) catch |err| {
+            log.err("error equalizing splits err={}", .{err});
+            return;
+        };
     }
 
     /// Invoke an action on the surface.
diff --git a/src/apprt/glfw.zig b/src/apprt/glfw.zig
index a3854a173..dabf63c2b 100644
--- a/src/apprt/glfw.zig
+++ b/src/apprt/glfw.zig
@@ -150,7 +150,13 @@ pub const App = struct {
             .open_config => try configpkg.edit.open(self.app.alloc),
 
             // Unimplemented
+            .new_split,
+            .goto_split,
+            .resize_split,
+            .equalize_splits,
+            .toggle_split_zoom,
             .close_all_windows,
+            .toggle_window_decorations,
             .goto_tab,
             .quit_timer,
             .secure_input,
diff --git a/src/apprt/structs.zig b/src/apprt/structs.zig
index 1982cc497..f8bcd72cf 100644
--- a/src/apprt/structs.zig
+++ b/src/apprt/structs.zig
@@ -62,13 +62,6 @@ pub const DesktopNotification = struct {
     body: []const u8,
 };
 
-// This is made extern (c_int) to make interop easier with our embedded
-// runtime. The small size cost doesn't make a difference in our union.
-pub const SplitDirection = enum(c_int) {
-    right,
-    down,
-};
-
 /// The color scheme in use (light vs dark).
 pub const ColorScheme = enum(u2) {
     light = 0,
diff --git a/src/input/Binding.zig b/src/input/Binding.zig
index 8f129065d..f39510554 100644
--- a/src/input/Binding.zig
+++ b/src/input/Binding.zig
@@ -410,8 +410,7 @@ pub const Action = union(enum) {
         // Note: we don't support top or left yet
     };
 
-    // Extern because it is used in the embedded runtime ABI.
-    pub const SplitFocusDirection = enum(c_int) {
+    pub const SplitFocusDirection = enum {
         previous,
         next,
 
@@ -421,8 +420,7 @@ pub const Action = union(enum) {
         right,
     };
 
-    // Extern because it is used in the embedded runtime ABI.
-    pub const SplitResizeDirection = enum(c_int) {
+    pub const SplitResizeDirection = enum {
         up,
         down,
         left,