Add project files.

HostApp/HostApp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\AddonLib\AddonLib.csproj" />
+  </ItemGroup>
+</Project>

HostApp/Program.cs

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+using System.Reflection;
+using AddonLib;
+
+namespace HostApp;
+
+public class HostApi
+{
+    [AddonCallable]
+    public string Echo(string message) => $"Echo: {message}";
+
+    [AddonAccessible(AddonAccess.ReadWrite)]
+    public int Counter { get; set; }
+
+    [AddonCallback] // event name defaults to method name
+    public void OnTick()
+    {
+        // Raise callback with caller name, no need to specify event name
+        _manager.RaiseAddonCallback();
+    }
+
+    private readonly AddonManager _manager;
+    public HostApi(AddonManager manager) => _manager = manager;
+}
+
+internal class Program
+{
+    private static void Main(string[] args)
+    {
+        // Initialize manager with Plugins folder and autoload
+        var manager = new AddonManager("Plugins", autoInitialize: true);
+
+        // Register host API so addons can call Echo and access Counter
+        var hostApi = new HostApi(manager);
+        manager.RegisterHostApi(hostApi);
+
+        Console.WriteLine("Host initialized. Press T to tick, Q to quit.");
+        while (true)
+        {
+            var key = Console.ReadKey(intercept: true).Key;
+            if (key == ConsoleKey.Q) break;
+            if (key == ConsoleKey.T)
+            {
+                hostApi.OnTick();
+            }
+        }
+    }
+}