diff --git a/src/engines/v8/v8.zig b/src/engines/v8/v8.zig
index bf9ca9a..6b50005 100644
--- a/src/engines/v8/v8.zig
+++ b/src/engines/v8/v8.zig
@@ -525,7 +525,7 @@ pub const Inspector = struct {
         ctx: *anyopaque,
         onResp: public.InspectorOnResponseFn,
         onEvent: public.InspectorOnEventFn,
-    ) !Inspector {
+    ) anyerror!Inspector {
         const inner = try alloc.create(v8.Inspector);
         const channel = v8.InspectorChannel.init(ctx, onResp, onEvent, env.isolate);
         const client = v8.InspectorClient.init();
@@ -543,7 +543,7 @@ pub const Inspector = struct {
         self.inner.contextCreated(env.js_ctx.?, name, origin, auxData);
     }
 
-    pub fn send(self: Inspector, msg: []const u8, env: Env) void {
+    pub fn send(self: Inspector, env: Env, msg: []const u8) void {
         return self.session.dispatchProtocolMessage(env.isolate, msg);
     }
 };
diff --git a/src/interfaces.zig b/src/interfaces.zig
index 1d7db3c..3dd3636 100644
--- a/src/interfaces.zig
+++ b/src/interfaces.zig
@@ -192,6 +192,33 @@ pub fn CallbackResult(comptime T: type) void {
     // TODO: how to get the result?
 }
 
+pub fn Inspector(comptime T: type, comptime Env_T: type) void {
+
+    // init()
+    assertDecl(T, "init", fn (
+        alloc: std.mem.Allocator,
+        env: Env_T,
+        ctx: *anyopaque,
+        onResp: public.InspectorOnResponseFn,
+        onEvent: public.InspectorOnEventFn,
+    ) anyerror!T);
+
+    // deinit()
+    assertDecl(T, "deinit", fn (self: T, alloc: std.mem.Allocator) void);
+
+    // contextCreated()
+    assertDecl(T, "contextCreated", fn (
+        self: T,
+        env: Env_T,
+        name: []const u8,
+        origin: []const u8,
+        auxData: ?[]const u8,
+    ) void);
+
+    // send()
+    assertDecl(T, "send", fn (self: T, env: Env_T, msg: []const u8) void);
+}
+
 // Utils
 // -----
 
diff --git a/src/private_api.zig b/src/private_api.zig
index 57703f4..be43c1e 100644
--- a/src/private_api.zig
+++ b/src/private_api.zig
@@ -38,6 +38,8 @@ fn checkInterfaces(engine: anytype) void {
         engine.Object,
     );
 
+    interfaces.Inspector(engine.Inspector, engine.Env);
+
     // private api
 }