chore: Update actions/setup-node action to v6

Also raise CA2016 (forward the CancellationToken parameter to methods that take one) to warning

Fixes #701

.github/workflows/ci.yaml

@@ -18,12 +18,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           fetch-depth: 0
 
       - name: Setup .NET SDK
-        uses: actions/setup-dotnet@v4
+        uses: actions/setup-dotnet@v5
         with:
           dotnet-version: |
             8.0.x

.github/workflows/publish.yaml

@@ -24,12 +24,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           fetch-depth: 0
 
       - name: Setup .NET SDK
-        uses: actions/setup-dotnet@v4
+        uses: actions/setup-dotnet@v5
         with:
           dotnet-version: |
             8.0.x
@@ -53,17 +53,17 @@ jobs:
     runs-on: windows-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
       with:
         fetch-depth: 0
 
     - name: Setup .NET SDK
-      uses: actions/setup-dotnet@v4
+      uses: actions/setup-dotnet@v5
 
     - name: Setup Node.js
-      uses: actions/setup-node@v4
+      uses: actions/setup-node@v6
       with:
-        node-version: '16'
+        node-version: '22'
 
     - name: Cache dependencies
       uses: actions/cache@v4

docs/Docs.csproj

@@ -38,8 +38,8 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Playwright" Version="1.52.0" />
+    <PackageReference Include="Microsoft.Playwright" Version="1.55.0" />
-    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
     <PackageReference Include="Statiq.CodeAnalysis" Version="1.0.0-beta.72" />
     <PackageReference Include="Statiq.Common" Version="1.0.0-beta.72" />
     <PackageReference Include="Statiq.Web" Version="1.0.0-beta.60" />

docs/Docs.sln

@@ -1,25 +0,0 @@
-
-Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 16
-VisualStudioVersion = 16.0.30011.22
-MinimumVisualStudioVersion = 10.0.40219.1
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Docs", "Docs.csproj", "{C337F609-A890-4E52-BDA3-91658039B0E3}"
-EndProject
-Global
-	GlobalSection(SolutionConfigurationPlatforms) = preSolution
-		Debug|Any CPU = Debug|Any CPU
-		Release|Any CPU = Release|Any CPU
-	EndGlobalSection
-	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{C337F609-A890-4E52-BDA3-91658039B0E3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{C337F609-A890-4E52-BDA3-91658039B0E3}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{C337F609-A890-4E52-BDA3-91658039B0E3}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{C337F609-A890-4E52-BDA3-91658039B0E3}.Release|Any CPU.Build.0 = Release|Any CPU
-	EndGlobalSection
-	GlobalSection(SolutionProperties) = preSolution
-		HideSolutionNode = FALSE
-	EndGlobalSection
-	GlobalSection(ExtensibilityGlobals) = postSolution
-		SolutionGuid = {2FB3922B-494A-45EB-A479-FC507B8E107C}
-	EndGlobalSection
-EndGlobal

docs/Docs.slnx

@@ -0,0 +1,3 @@
+<Solution>
+  <Project Path="Docs.csproj" />
+</Solution>

docs/global.json

@@ -1,6 +0,0 @@
-{
-  "sdk": {
-    "version": "9.0.202",
-    "rollForward": "latestFeature"
-  }
-}

docs/input/blog/posts/2025-09-07-spectre-console-0.51-released.md

@@ -1,11 +1,13 @@
-Title: Spectre.Console 0.51 released!
+Title: Spectre.Console 0.51.1 released!
 Description: Not a substitute for human interaction.
 Published: 2025-09-07
 Category: Release Notes
 Excluded: false
 ---
 
-Version 0.51 of Spectre.Console has been released!
+Version `0.51.1` of Spectre.Console has been released!
+  
+_Note: Due to an issue discovered after the release of version 0.51.0, that version has now been unlisted. Let’s all pretend it never existed 😅_
 
 ## What's Changed
 
@@ -38,4 +40,4 @@ Version 0.51 of Spectre.Console has been released!
 * [@mitchdenny](https://github.com/mitchdenny) made their first contribution in [#1881](https://github.com/spectreconsole/spectre.console/pull/1881)
 * [@mattfennerom](https://github.com/mattfennerom) made their first contribution in [#1890](https://github.com/spectreconsole/spectre.console/pull/1890)
 
-**Full Changelog**: [0.50.0...0.51.0](https://github.com/spectreconsole/spectre.console/compare/0.50.0...0.51.0)
+**Full Changelog**: [0.50.0...0.51.0](https://github.com/spectreconsole/spectre.console/compare/0.50.0...0.51.1)

docs/input/blog/posts/2025-10-10-spectre-console-0.52-released.md

@@ -0,0 +1,17 @@
+Title: Spectre.Console 0.52.0 released!
+Description: Don't eat (too much) glue.
+Published: 2025-10-10
+Category: Release Notes
+Excluded: false
+---
+
+Version `0.52.0` of Spectre.Console has been released!
+
+Exciting things are happening. We’ve merged support for my love child, OpenCli, in this release. That means you can now pass the parameter `--help-dump-opencli` to your application to get an [OpenCli](https://opencli.org) description dumped to stdout.
+
+## What's Changed
+
+* Add OpenCLI integration to Spectre.Console.Cli by [@patriksvensson](https://github.com/patriksvensson) in [#1909](https://github.com/spectreconsole/spectre.console/pull/1909)
+* Fix OPENCLI_VISIBILITY_INTERNAL to DefineConstants concat by [@devlead](https://github.com/devlead) in [#1912](https://github.com/spectreconsole/spectre.console/pull/1912)
+
+**Full Changelog**: https://github.com/spectreconsole/spectre.console/compare/0.51.1...0.52.0

docs/input/cli/opencli.md

@@ -0,0 +1,22 @@
+Title: OpenCLI Integration
+Order: 15
+Description: OpenCLI integration
+Highlights:
+ - Generate OpenCLI descriptions
+---
+
+From version `0.52.0` and above, you will be able to generate [OpenCLI](https://opencli.org)
+descriptions from your `Spectre.Console.Cli` applications.
+
+Simply add the `--help-dump-opencli` option to your application, and an 
+OpenCLI description will be written to stdout.
+
+```shell
+$ ./myapp --help-dump-opencli
+```
+
+If you want to save it to disk, pipe it to a file.
+
+```shell
+$ ./myapp --help-dump-opencli > myapp.openapi.json
+```

dotnet-tools.json

@@ -3,7 +3,7 @@
   "isRoot": true,
   "tools": {
     "cake.tool": {
-      "version": "5.0.0",
+      "version": "5.1.0",
       "commands": [
         "dotnet-cake"
       ]

global.json

@@ -1,7 +1,7 @@
 {
   "$schema": "http://json.schemastore.org/global",
   "sdk": {
-    "version": "9.0.202",
+    "version": "9.0.305",
     "rollForward": "latestFeature"
   }
 }

resources/scripts/Generator/Commands/ColorGeneratorCommand.cs

@@ -1,4 +1,5 @@
 using System.IO;
+using System.Threading;
 using Generator.Models;
 using Scriban;
 using Spectre.Console.Cli;
@@ -21,7 +22,7 @@ namespace Generator.Commands
             public string Input { get; set; }
         }
 
-        public override int Execute(CommandContext context, Settings settings)
+        public override int Execute(CommandContext context, Settings settings, CancellationToken cancellationToken)
         {
             var templates = new FilePath[]
             {

resources/scripts/Generator/Commands/EmojiGeneratorCommand.cs

@@ -2,6 +2,7 @@ using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Net.Http;
+using System.Threading;
 using System.Threading.Tasks;
 using AngleSharp.Html.Parser;
 using Generator.Models;
@@ -39,7 +40,7 @@ namespace Generator.Commands
             _parser = new HtmlParser();
         }
 
-        public override async Task<int> ExecuteAsync(CommandContext context, Settings settings)
+        public override async Task<int> ExecuteAsync(CommandContext context, Settings settings, CancellationToken cancellationToken)
         {
             var output = new DirectoryPath(settings.Output);
             if (!_fileSystem.Directory.Exists(settings.Output))

resources/scripts/Generator/Commands/SampleCommand.cs

@@ -4,6 +4,7 @@ using System.Diagnostics.CodeAnalysis;
 using System.IO;
 using System.Linq;
 using System.Text;
+using System.Threading;
 using Generator.Commands.Samples;
 using Spectre.Console;
 using Spectre.Console.Cli;
@@ -38,7 +39,7 @@ namespace Generator.Commands
             _console = new AsciiCastConsole(console);
         }
 
-        public override int Execute([NotNull] CommandContext context, [NotNull] Settings settings)
+        public override int Execute([NotNull] CommandContext context, [NotNull] Settings settings, CancellationToken cancellationToken)
         {
             var samples = typeof(BaseSample).Assembly
                 .GetTypes()

resources/scripts/Generator/Commands/SpinnerGeneratorCommand.cs

@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.IO;
+using System.Threading;
 using Generator.Models;
 using Scriban;
 using Spectre.Console.Cli;
@@ -16,7 +17,7 @@ namespace Generator.Commands
             _fileSystem = new FileSystem();
         }
 
-        public override int Execute(CommandContext context, GeneratorSettings settings)
+        public override int Execute(CommandContext context, GeneratorSettings settings, CancellationToken cancellationToken)
         {
             // Read the spinner model.
             var spinners = new List<Spinner>();

resources/scripts/Generator/Generator.csproj

@@ -45,9 +45,9 @@
   <ItemGroup>
     <PackageReference Include="AngleSharp" Version="1.3.0" />
     <PackageReference Include="Humanizer.Core" Version="2.14.1" />
-    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
-    <PackageReference Include="Scriban" Version="6.2.1" />
+    <PackageReference Include="Scriban" Version="6.4.0" />
-    <PackageReference Include="Spectre.IO" Version="0.18.0" />
+    <PackageReference Include="Spectre.IO" Version="0.20.0" />
   </ItemGroup>
 
   <ItemGroup>

src/.editorconfig

@@ -100,5 +100,8 @@ dotnet_diagnostic.RCS1047.severity = none
 # RCS1090: Call 'ConfigureAwait(false)'.
 dotnet_diagnostic.RCS1090.severity = warning
 
-# The file header is missing or not located at the top of the file
+# SA1633: The file header is missing or not located at the top of the file
 dotnet_diagnostic.SA1633.severity = none
+
+# CA2016: Forward the CancellationToken parameter to methods that take one
+dotnet_diagnostic.CA2016.severity = warning

src/Directory.Packages.props

@@ -4,22 +4,23 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageVersion Include="IsExternalInit" Version="1.0.3" />
-    <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="9.0.3" />
+    <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="9.0.9" />
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
     <PackageVersion Include="Microsoft.SourceLink.GitHub" PrivateAssets="All" Version="8.0.0" />
     <PackageVersion Include="MinVer" PrivateAssets="All" Version="6.0.0" />
+    <PackageVersion Include="OpenCli.Sources" Version="0.5.0" />
     <PackageVersion Include="PolySharp" Version="1.15.0" />
-    <PackageVersion Include="Roslynator.Analyzers" PrivateAssets="All" Version="4.14.0" />
+    <PackageVersion Include="Roslynator.Analyzers" PrivateAssets="All" Version="4.14.1" />
     <PackageVersion Include="Shouldly" Version="4.3.0" />
     <PackageVersion Include="SixLabors.ImageSharp" Version="3.1.11" />
     <PackageVersion Include="Spectre.Verify.Extensions" Version="28.16.0" />
     <PackageVersion Include="StyleCop.Analyzers" PrivateAssets="All" Version="1.2.0-beta.556" />
     <PackageVersion Include="System.Memory" Version="4.6.3" />
     <PackageVersion Include="TunnelVisionLabs.ReferenceAssemblyAnnotator" Version="1.0.0-alpha.160" />
-    <PackageVersion Include="Verify.Xunit" Version="30.5.0" />
+    <PackageVersion Include="Verify.Xunit" Version="31.0.1" />
-    <PackageVersion Include="Wcwidth.Sources" Version="2.0.0" />
+    <PackageVersion Include="Wcwidth.Sources" Version="3.0.0" />
     <PackageVersion Include="xunit" Version="2.9.3" />
-    <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.3">
+    <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageVersion>

src/Spectre.Console.Cli/AsyncCommand.cs

@@ -9,19 +9,20 @@ public abstract class AsyncCommand : ICommand<EmptyCommandSettings>
     /// Executes the command.
     /// </summary>
     /// <param name="context">The command context.</param>
+    /// <param name="cancellationToken">A <see cref="CancellationToken"/> that can be used to abort the command.</param>
     /// <returns>An integer indicating whether or not the command executed successfully.</returns>
-    public abstract Task<int> ExecuteAsync(CommandContext context);
+    public abstract Task<int> ExecuteAsync(CommandContext context, CancellationToken cancellationToken);
 
     /// <inheritdoc/>
-    Task<int> ICommand<EmptyCommandSettings>.Execute(CommandContext context, EmptyCommandSettings settings)
+    Task<int> ICommand<EmptyCommandSettings>.ExecuteAsync(CommandContext context, EmptyCommandSettings settings, CancellationToken cancellationToken)
     {
-        return ExecuteAsync(context);
+        return ExecuteAsync(context, cancellationToken);
     }
 
     /// <inheritdoc/>
-    Task<int> ICommand.Execute(CommandContext context, CommandSettings settings)
+    Task<int> ICommand.ExecuteAsync(CommandContext context, CommandSettings settings, CancellationToken cancellationToken)
     {
-        return ExecuteAsync(context);
+        return ExecuteAsync(context, cancellationToken);
     }
 
     /// <inheritdoc/>

src/Spectre.Console.Cli/AsyncCommandOfT.cs

@@ -23,8 +23,9 @@ public abstract class AsyncCommand<TSettings> : ICommand<TSettings>
     /// </summary>
     /// <param name="context">The command context.</param>
     /// <param name="settings">The settings.</param>
+    /// <param name="cancellationToken">A <see cref="CancellationToken"/> that can be used to abort the command.</param>
     /// <returns>An integer indicating whether or not the command executed successfully.</returns>
-    public abstract Task<int> ExecuteAsync(CommandContext context, TSettings settings);
+    public abstract Task<int> ExecuteAsync(CommandContext context, TSettings settings, CancellationToken cancellationToken);
 
     /// <inheritdoc/>
     ValidationResult ICommand.Validate(CommandContext context, CommandSettings settings)
@@ -33,15 +34,15 @@ public abstract class AsyncCommand<TSettings> : ICommand<TSettings>
     }
 
     /// <inheritdoc/>
-    Task<int> ICommand.Execute(CommandContext context, CommandSettings settings)
+    Task<int> ICommand.ExecuteAsync(CommandContext context, CommandSettings settings, CancellationToken cancellationToken)
     {
         Debug.Assert(settings is TSettings, "Command settings is of unexpected type.");
-        return ExecuteAsync(context, (TSettings)settings);
+        return ExecuteAsync(context, (TSettings)settings, cancellationToken);
     }
 
     /// <inheritdoc/>
-    Task<int> ICommand<TSettings>.Execute(CommandContext context, TSettings settings)
+    Task<int> ICommand<TSettings>.ExecuteAsync(CommandContext context, TSettings settings, CancellationToken cancellationToken)
     {
-        return ExecuteAsync(context, settings);
+        return ExecuteAsync(context, settings, cancellationToken);
     }
 }

src/Spectre.Console.Cli/Command.cs

@@ -10,19 +10,20 @@ public abstract class Command : ICommand<EmptyCommandSettings>
     /// Executes the command.
     /// </summary>
     /// <param name="context">The command context.</param>
+    /// <param name="cancellationToken">A <see cref="CancellationToken"/> that can be used to abort the command.</param>
     /// <returns>An integer indicating whether or not the command executed successfully.</returns>
-    public abstract int Execute(CommandContext context);
+    public abstract int Execute(CommandContext context, CancellationToken cancellationToken);
 
     /// <inheritdoc/>
-    Task<int> ICommand<EmptyCommandSettings>.Execute(CommandContext context, EmptyCommandSettings settings)
+    Task<int> ICommand<EmptyCommandSettings>.ExecuteAsync(CommandContext context, EmptyCommandSettings settings, CancellationToken cancellationToken)
     {
-        return Task.FromResult(Execute(context));
+        return Task.FromResult(Execute(context, cancellationToken));
     }
 
     /// <inheritdoc/>
-    Task<int> ICommand.Execute(CommandContext context, CommandSettings settings)
+    Task<int> ICommand.ExecuteAsync(CommandContext context, CommandSettings settings, CancellationToken cancellationToken)
     {
-        return Task.FromResult(Execute(context));
+        return Task.FromResult(Execute(context, cancellationToken));
     }
 
     /// <inheritdoc/>

src/Spectre.Console.Cli/CommandApp.cs

@@ -26,10 +26,7 @@ public sealed class CommandApp : ICommandApp
         _executor = new CommandExecutor(registrar);
     }
 
-    /// <summary>
+    /// <inheritdoc/>
-    /// Configures the command line application.
-    /// </summary>
-    /// <param name="configuration">The configuration.</param>
     public void Configure(Action<IConfigurator> configuration)
     {
         if (configuration == null)
@@ -51,22 +48,14 @@ public sealed class CommandApp : ICommandApp
         return new DefaultCommandConfigurator(GetConfigurator().SetDefaultCommand<TCommand>());
     }
 
-    /// <summary>
+    /// <inheritdoc/>
-    /// Runs the command line application with specified arguments.
+    public int Run(IEnumerable<string> args, CancellationToken cancellationToken = default)
-    /// </summary>
-    /// <param name="args">The arguments.</param>
-    /// <returns>The exit code from the executed command.</returns>
-    public int Run(IEnumerable<string> args)
     {
-        return RunAsync(args).GetAwaiter().GetResult();
+        return RunAsync(args, cancellationToken).GetAwaiter().GetResult();
     }
 
-    /// <summary>
+    /// <inheritdoc/>
-    /// Runs the command line application with specified arguments.
+    public async Task<int> RunAsync(IEnumerable<string> args, CancellationToken cancellationToken = default)
-    /// </summary>
-    /// <param name="args">The arguments.</param>
-    /// <returns>The exit code from the executed command.</returns>
-    public async Task<int> RunAsync(IEnumerable<string> args)
     {
         try
         {
@@ -79,13 +68,14 @@ public sealed class CommandApp : ICommandApp
                     cli.AddCommand<VersionCommand>(CliConstants.Commands.Version);
                     cli.AddCommand<XmlDocCommand>(CliConstants.Commands.XmlDoc);
                     cli.AddCommand<ExplainCommand>(CliConstants.Commands.Explain);
+                    cli.AddCommand<OpenCliGeneratorCommand>(CliConstants.Commands.OpenCli);
                 });
 
                 _executed = true;
             }
 
             return await _executor
-                .Execute(_configurator, args)
+                .ExecuteAsync(_configurator, args, cancellationToken)
                 .ConfigureAwait(false);
         }
         catch (Exception ex)
@@ -108,6 +98,11 @@ public sealed class CommandApp : ICommandApp
                 return _configurator.Settings.ExceptionHandler(ex, null);
             }
 
+            if (ex is OperationCanceledException)
+            {
+                return _configurator.Settings.CancellationExitCode;
+            }
+
             // Render the exception.
             var pretty = GetRenderableErrorMessage(ex);
             if (pretty != null)

src/Spectre.Console.Cli/CommandAppOfT.cs

@@ -25,33 +25,22 @@ public sealed class CommandApp<TDefaultCommand> : ICommandApp
         _defaultCommandConfigurator = _app.SetDefaultCommand<TDefaultCommand>();
     }
 
-    /// <summary>
+    /// <inheritdoc/>
-    /// Configures the command line application.
-    /// </summary>
-    /// <param name="configuration">The configuration.</param>
     public void Configure(Action<IConfigurator> configuration)
     {
         _app.Configure(configuration);
     }
 
-    /// <summary>
+    /// <inheritdoc/>
-    /// Runs the command line application with specified arguments.
+    public int Run(IEnumerable<string> args, CancellationToken cancellationToken = default)
-    /// </summary>
-    /// <param name="args">The arguments.</param>
-    /// <returns>The exit code from the executed command.</returns>
-    public int Run(IEnumerable<string> args)
     {
-        return _app.Run(args);
+        return _app.Run(args, cancellationToken);
     }
 
-    /// <summary>
+    /// <inheritdoc/>
-    /// Runs the command line application with specified arguments.
+    public Task<int> RunAsync(IEnumerable<string> args, CancellationToken cancellationToken = default)
-    /// </summary>
-    /// <param name="args">The arguments.</param>
-    /// <returns>The exit code from the executed command.</returns>
-    public Task<int> RunAsync(IEnumerable<string> args)
     {
-        return _app.RunAsync(args);
+        return _app.RunAsync(args, cancellationToken);
     }
 
     internal Configurator GetConfigurator()

src/Spectre.Console.Cli/CommandOfT.cs

@@ -24,8 +24,9 @@ public abstract class Command<TSettings> : ICommand<TSettings>
     /// </summary>
     /// <param name="context">The command context.</param>
     /// <param name="settings">The settings.</param>
+    /// <param name="cancellationToken">A <see cref="CancellationToken"/> that can be used to abort the command.</param>
     /// <returns>An integer indicating whether or not the command executed successfully.</returns>
-    public abstract int Execute(CommandContext context, TSettings settings);
+    public abstract int Execute(CommandContext context, TSettings settings, CancellationToken cancellationToken);
 
     /// <inheritdoc/>
     ValidationResult ICommand.Validate(CommandContext context, CommandSettings settings)
@@ -34,15 +35,15 @@ public abstract class Command<TSettings> : ICommand<TSettings>
     }
 
     /// <inheritdoc/>
-    Task<int> ICommand.Execute(CommandContext context, CommandSettings settings)
+    Task<int> ICommand.ExecuteAsync(CommandContext context, CommandSettings settings, CancellationToken cancellationToken)
     {
         Debug.Assert(settings is TSettings, "Command settings is of unexpected type.");
-        return Task.FromResult(Execute(context, (TSettings)settings));
+        return Task.FromResult(Execute(context, (TSettings)settings, cancellationToken));
     }
 
     /// <inheritdoc/>
-    Task<int> ICommand<TSettings>.Execute(CommandContext context, TSettings settings)
+    Task<int> ICommand<TSettings>.ExecuteAsync(CommandContext context, TSettings settings, CancellationToken cancellationToken)
     {
-        return Task.FromResult(Execute(context, settings));
+        return Task.FromResult(Execute(context, settings, cancellationToken));
     }
 }

src/Spectre.Console.Cli/ConfiguratorExtensions.cs

@@ -201,6 +201,24 @@ public static class ConfiguratorExtensions
         return configurator;
     }
 
+    /// <summary>
+    /// Tells the command line application to return the specified exit code when it's aborted through the <see cref="CancellationToken"/>.
+    /// The default cancellation exit code is 130.
+    /// </summary>
+    /// <param name="configurator">The configurator.</param>
+    /// <param name="exitCode">The exit code to return in case of cancellation.</param>
+    /// <returns>A configurator that can be used to configure the application further.</returns>
+    public static IConfigurator CancellationExitCode(this IConfigurator configurator, int exitCode)
+    {
+        if (configurator == null)
+        {
+            throw new ArgumentNullException(nameof(configurator));
+        }
+
+        configurator.Settings.CancellationExitCode = exitCode;
+        return configurator;
+    }
+
     /// <summary>
     /// Configures case sensitivity.
     /// </summary>
@@ -304,14 +322,14 @@ public static class ConfiguratorExtensions
     public static ICommandConfigurator AddDelegate(
         this IConfigurator configurator,
         string name,
-        Func<CommandContext, int> func)
+        Func<CommandContext, CancellationToken, int> func)
     {
         if (configurator == null)
         {
             throw new ArgumentNullException(nameof(configurator));
         }
 
-        return configurator.AddDelegate<EmptyCommandSettings>(name, (c, _) => func(c));
+        return configurator.AddDelegate<EmptyCommandSettings>(name, (c, _, ct) => func(c, ct));
     }
 
     /// <summary>
@@ -324,14 +342,14 @@ public static class ConfiguratorExtensions
     public static ICommandConfigurator AddAsyncDelegate(
         this IConfigurator configurator,
         string name,
-        Func<CommandContext, Task<int>> func)
+        Func<CommandContext, CancellationToken, Task<int>> func)
     {
         if (configurator == null)
         {
             throw new ArgumentNullException(nameof(configurator));
         }
 
-        return configurator.AddAsyncDelegate<EmptyCommandSettings>(name, (c, _) => func(c));
+        return configurator.AddAsyncDelegate<EmptyCommandSettings>(name, (c, _, ct) => func(c, ct));
     }
 
     /// <summary>
@@ -345,7 +363,7 @@ public static class ConfiguratorExtensions
     public static ICommandConfigurator AddDelegate<TSettings>(
         this IConfigurator<TSettings>? configurator,
         string name,
-        Func<CommandContext, int> func)
+        Func<CommandContext, CancellationToken, int> func)
         where TSettings : CommandSettings
     {
         if (typeof(TSettings).IsAbstract)
@@ -358,7 +376,7 @@ public static class ConfiguratorExtensions
             throw new ArgumentNullException(nameof(configurator));
         }
 
-        return configurator.AddDelegate<TSettings>(name, (c, _) => func(c));
+        return configurator.AddDelegate<TSettings>(name, (c, _, ct) => func(c, ct));
     }
 
     /// <summary>
@@ -372,7 +390,7 @@ public static class ConfiguratorExtensions
     public static ICommandConfigurator AddAsyncDelegate<TSettings>(
         this IConfigurator<TSettings> configurator,
         string name,
-        Func<CommandContext, Task<int>> func)
+        Func<CommandContext, CancellationToken, Task<int>> func)
         where TSettings : CommandSettings
     {
         if (configurator == null)
@@ -380,7 +398,7 @@ public static class ConfiguratorExtensions
             throw new ArgumentNullException(nameof(configurator));
         }
 
-        return configurator.AddAsyncDelegate<TSettings>(name, (c, _) => func(c));
+        return configurator.AddAsyncDelegate<TSettings>(name, (c, _, ct) => func(c, ct));
     }
 
     /// <summary>

src/Spectre.Console.Cli/ICommand.cs

@@ -18,6 +18,7 @@ public interface ICommand
     /// </summary>
     /// <param name="context">The command context.</param>
     /// <param name="settings">The settings.</param>
+    /// <param name="cancellationToken">A <see cref="CancellationToken"/> that can be used to abort the command.</param>
     /// <returns>The validation result.</returns>
-    Task<int> Execute(CommandContext context, CommandSettings settings);
+    Task<int> ExecuteAsync(CommandContext context, CommandSettings settings, CancellationToken cancellationToken);
 }

src/Spectre.Console.Cli/ICommandApp.cs

@@ -15,13 +15,15 @@ public interface ICommandApp
     /// Runs the command line application with specified arguments.
     /// </summary>
     /// <param name="args">The arguments.</param>
+    /// <param name="cancellationToken">A <see cref="CancellationToken"/> that can be used to abort the application.</param>
     /// <returns>The exit code from the executed command.</returns>
-    int Run(IEnumerable<string> args);
+    int Run(IEnumerable<string> args, CancellationToken cancellationToken = default);
 
     /// <summary>
     /// Runs the command line application with specified arguments.
     /// </summary>
     /// <param name="args">The arguments.</param>
+    /// <param name="cancellationToken">A <see cref="CancellationToken"/> that can be used to abort the application.</param>
     /// <returns>The exit code from the executed command.</returns>
-    Task<int> RunAsync(IEnumerable<string> args);
+    Task<int> RunAsync(IEnumerable<string> args, CancellationToken cancellationToken = default);
 }

src/Spectre.Console.Cli/ICommandAppSettings.cs

@@ -88,6 +88,12 @@ public interface ICommandAppSettings
     /// </summary>
     bool PropagateExceptions { get; set; }
 
+    /// <summary>
+    /// Gets or sets the value used as the application exit code when it's aborted through the <see cref="CancellationToken"/>.
+    /// The default cancellation exit code is 130.
+    /// </summary>
+    int CancellationExitCode { get; set; }
+
     /// <summary>
     /// Gets or sets a value indicating whether or not examples should be validated.
     /// </summary>

src/Spectre.Console.Cli/ICommandOfT.cs

@@ -12,6 +12,7 @@ public interface ICommand<TSettings> : ICommandLimiter<TSettings>
     /// </summary>
     /// <param name="context">The command context.</param>
     /// <param name="settings">The settings.</param>
+    /// <param name="cancellationToken">A <see cref="CancellationToken"/> that can be used to abort the command.</param>
     /// <returns>An integer indicating whether or not the command executed successfully.</returns>
-    Task<int> Execute(CommandContext context, TSettings settings);
+    Task<int> ExecuteAsync(CommandContext context, TSettings settings, CancellationToken cancellationToken);
 }

src/Spectre.Console.Cli/IConfigurator.cs

@@ -48,7 +48,7 @@ public interface IConfigurator
     /// <param name="name">The name of the command.</param>
     /// <param name="func">The delegate to execute as part of command execution.</param>
     /// <returns>A command configurator that can be used to configure the command further.</returns>
-    ICommandConfigurator AddDelegate<TSettings>(string name, Func<CommandContext, TSettings, int> func)
+    ICommandConfigurator AddDelegate<TSettings>(string name, Func<CommandContext, TSettings, CancellationToken, int> func)
         where TSettings : CommandSettings;
 
     /// <summary>
@@ -58,7 +58,7 @@ public interface IConfigurator
     /// <param name="name">The name of the command.</param>
     /// <param name="func">The delegate to execute as part of command execution.</param>
     /// <returns>A command configurator that can be used to configure the command further.</returns>
-    ICommandConfigurator AddAsyncDelegate<TSettings>(string name, Func<CommandContext, TSettings, Task<int>> func)
+    ICommandConfigurator AddAsyncDelegate<TSettings>(string name, Func<CommandContext, TSettings, CancellationToken, Task<int>> func)
         where TSettings : CommandSettings;
 
     /// <summary>

src/Spectre.Console.Cli/IConfiguratorOfT.cs

@@ -54,7 +54,7 @@ public interface IConfigurator<in TSettings>
     /// <param name="name">The name of the command.</param>
     /// <param name="func">The delegate to execute as part of command execution.</param>
     /// <returns>A command configurator that can be used to configure the command further.</returns>
-    ICommandConfigurator AddDelegate<TDerivedSettings>(string name, Func<CommandContext, TDerivedSettings, int> func)
+    ICommandConfigurator AddDelegate<TDerivedSettings>(string name, Func<CommandContext, TDerivedSettings, CancellationToken, int> func)
         where TDerivedSettings : TSettings;
 
     /// <summary>
@@ -64,7 +64,7 @@ public interface IConfigurator<in TSettings>
     /// <param name="name">The name of the command.</param>
     /// <param name="func">The delegate to execute as part of command execution.</param>
     /// <returns>A command configurator that can be used to configure the command further.</returns>
-    ICommandConfigurator AddAsyncDelegate<TDerivedSettings>(string name, Func<CommandContext, TDerivedSettings, Task<int>> func)
+    ICommandConfigurator AddAsyncDelegate<TDerivedSettings>(string name, Func<CommandContext, TDerivedSettings, CancellationToken, Task<int>> func)
         where TDerivedSettings : TSettings;
 
     /// <summary>

src/Spectre.Console.Cli/Internal/CommandExecutor.cs

@@ -12,7 +12,7 @@ internal sealed class CommandExecutor
         _registrar.Register(typeof(DefaultPairDeconstructor), typeof(DefaultPairDeconstructor));
     }
 
-    public async Task<int> Execute(IConfiguration configuration, IEnumerable<string> args)
+    public async Task<int> ExecuteAsync(IConfiguration configuration, IEnumerable<string> args, CancellationToken cancellationToken)
     {
         CommandTreeParserResult parsedResult;
 
@@ -68,6 +68,13 @@ internal sealed class CommandExecutor
                     }
                 }
             }
+
+            // OpenCLI?
+            if (firstArgument.Equals(CliConstants.DumpHelpOpenCliOption, StringComparison.OrdinalIgnoreCase))
+            {
+                // Replace all arguments with the opencligen command
+                arguments = ["cli", "opencli"];
+            }
         }
 
         // Parse and map the model against the arguments.
@@ -118,7 +125,7 @@ internal sealed class CommandExecutor
                 leaf.Command.Data);
 
             // Execute the command tree.
-            return await Execute(leaf, parsedResult.Tree, context, resolver, configuration).ConfigureAwait(false);
+            return await ExecuteAsync(leaf, parsedResult.Tree, context, resolver, configuration, cancellationToken).ConfigureAwait(false);
         }
     }
 
@@ -215,12 +222,13 @@ internal sealed class CommandExecutor
         return (parsedResult, tokenizerResult);
     }
 
-    private static async Task<int> Execute(
+    private static async Task<int> ExecuteAsync(
         CommandTree leaf,
         CommandTree tree,
         CommandContext context,
         ITypeResolver resolver,
-        IConfiguration configuration)
+        IConfiguration configuration,
+        CancellationToken cancellationToken)
     {
         try
         {
@@ -249,7 +257,7 @@ internal sealed class CommandExecutor
             }
 
             // Execute the command.
-            var result = await command.Execute(context, settings);
+            var result = await command.ExecuteAsync(context, settings, cancellationToken);
             foreach (var interceptor in interceptors)
             {
                 interceptor.InterceptResult(context, settings, ref result);

src/Spectre.Console.Cli/Internal/Commands/ExplainCommand.cs

@@ -2,7 +2,7 @@ namespace Spectre.Console.Cli;
 
 [Description("Displays diagnostics about CLI configurations")]
 [SuppressMessage("Performance", "CA1812: Avoid uninstantiated internal classes")]
-internal sealed class ExplainCommand : Command<ExplainCommand.Settings>
+internal sealed class ExplainCommand : Command<ExplainCommand.Settings>, IBuiltInCommand
 {
     private readonly CommandModel _commandModel;
     private readonly IAnsiConsole _writer;
@@ -27,7 +27,7 @@ internal sealed class ExplainCommand : Command<ExplainCommand.Settings>
         public bool IncludeHidden { get; set; }
     }
 
-    public override int Execute(CommandContext context, Settings settings)
+    public override int Execute(CommandContext context, Settings settings, CancellationToken cancellationToken)
     {
         var tree = new Tree("CLI Configuration");
         tree.AddNode(ValueMarkup("Application Name", _commandModel.ApplicationName, "no application name"));

src/Spectre.Console.Cli/Internal/Commands/IBuiltInCommand.cs

@@ -0,0 +1,9 @@
+namespace Spectre.Console.Cli;
+
+/// <summary>
+/// Represents a built-in command.
+/// Used as a marker interface.
+/// </summary>
+internal interface IBuiltInCommand : ICommand
+{
+}

src/Spectre.Console.Cli/Internal/Commands/OpenCliGeneratorCommand.cs

@@ -0,0 +1,224 @@
+using OpenCli;
+
+namespace Spectre.Console.Cli;
+
+internal sealed class OpenCliGeneratorCommand : Command, IBuiltInCommand
+{
+    private readonly IConfiguration _configuration;
+    private readonly CommandModel _model;
+
+    public OpenCliGeneratorCommand(IConfiguration configuration, CommandModel model)
+    {
+        _configuration = configuration;
+        _model = model ?? throw new ArgumentNullException(nameof(model));
+    }
+
+    public override int Execute(CommandContext context, CancellationToken cancellationToken)
+    {
+        var document = new OpenCliDocument
+        {
+            OpenCli = "0.1-draft",
+            Info = new OpenCliInfo
+            {
+                Title = ((ICommandModel)_model).ApplicationName, Version = _model.ApplicationVersion ?? "1.0",
+            },
+            Commands = CreateCommands(_model.Commands),
+            Arguments = CreateArguments(_model.DefaultCommand?.GetArguments()),
+            Options = CreateOptions(_model.DefaultCommand?.GetOptions()),
+        };
+
+        var writer = _configuration.Settings.Console.GetConsole();
+        writer.WriteLine(document.Write());
+
+        return 0;
+    }
+
+    private List<OpenCliCommand> CreateCommands(IList<CommandInfo> commands)
+    {
+        var result = new List<OpenCliCommand>();
+
+        foreach (var command in commands.OrderBy(o => o.Name, StringComparer.OrdinalIgnoreCase))
+        {
+            if (typeof(IBuiltInCommand).IsAssignableFrom(command.CommandType))
+            {
+                continue;
+            }
+
+            var openCliCommand = new OpenCliCommand
+            {
+                Name = command.Name,
+                Aliases =
+                [
+                    ..command.Aliases.OrderBy(str => str)
+                ],
+                Commands = CreateCommands(command.Children),
+                Arguments = CreateArguments(command.GetArguments()),
+                Options = CreateOptions(command.GetOptions()),
+                Description = command.Description,
+                Hidden = command.IsHidden,
+                Examples = [..command.Examples.Select(example => string.Join(" ", example))],
+            };
+
+            // Skip branches without commands
+            if (command.IsBranch && openCliCommand.Commands.Count == 0)
+            {
+                continue;
+            }
+
+            result.Add(openCliCommand);
+        }
+
+        return result;
+    }
+
+    private List<OpenCliArgument> CreateArguments(IEnumerable<CommandArgument>? arguments)
+    {
+        var result = new List<OpenCliArgument>();
+
+        if (arguments == null)
+        {
+            return result;
+        }
+
+        foreach (var argument in arguments.OrderBy(x => x.Position))
+        {
+            var metadata = default(List<OpenCliMetadata>);
+            if (argument.ParameterType != typeof(void) &&
+                argument.ParameterType != typeof(bool))
+            {
+                metadata =
+                [
+                    new OpenCliMetadata { Name = "ClrType", Value = argument.ParameterType.ToCliTypeString(), },
+                ];
+            }
+
+            result.Add(new OpenCliArgument
+            {
+                Name = argument.Value,
+                Required = argument.IsRequired,
+                Arity = new OpenCliArity
+                {
+                    // TODO: Look into this
+                    Minimum = 1,
+                    Maximum = 1,
+                },
+                Description = argument.Description,
+                Hidden = argument.IsHidden,
+                Metadata = metadata,
+                AcceptedValues = null,
+                Group = null,
+            });
+        }
+
+        return result;
+    }
+
+    private List<OpenCliOption> CreateOptions(IEnumerable<CommandOption>? options)
+    {
+        var result = new List<OpenCliOption>();
+
+        if (options == null)
+        {
+            return result;
+        }
+
+        foreach (var option in options.OrderBy(o => o.GetOptionName(), StringComparer.OrdinalIgnoreCase))
+        {
+            var arguments = new List<OpenCliArgument>();
+            if (option.ParameterType != typeof(void) &&
+                option.ParameterType != typeof(bool))
+            {
+                arguments.Add(new OpenCliArgument
+                {
+                    Name = option.ValueName ?? "VALUE",
+                    Required = !option.ValueIsOptional,
+                    Arity = new OpenCliArity
+                    {
+                        // TODO: Look into this
+                        Minimum = option.ValueIsOptional
+                            ? 0
+                            : 1,
+                        Maximum = 1,
+                    },
+                    AcceptedValues = null,
+                    Group = null,
+                    Hidden = null,
+                    Metadata =
+                    [
+                        new OpenCliMetadata
+                        {
+                            Name = "ClrType",
+                            Value = option.ParameterType.ToCliTypeString(),
+                        },
+                    ],
+                });
+            }
+
+            var optionMetadata = default(List<OpenCliMetadata>);
+            if (arguments.Count == 0 && option.ParameterType != typeof(void) &&
+                option.ParameterType != typeof(bool))
+            {
+                optionMetadata =
+                [
+                    new OpenCliMetadata { Name = "ClrType", Value = option.ParameterType.ToCliTypeString(), },
+                ];
+            }
+
+            var (optionName, optionAliases) = GetOptionNames(option);
+            result.Add(new OpenCliOption
+            {
+                Name = optionName,
+                Required = option.IsRequired,
+                Aliases = [..optionAliases.OrderBy(str => str)],
+                Arguments = arguments,
+                Description = option.Description,
+                Group = null,
+                Hidden = option.IsHidden,
+                Recursive = option.IsShadowed, // TODO: Is this correct?
+                Metadata = optionMetadata,
+            });
+        }
+
+        return result;
+    }
+
+    private static (string Name, HashSet<string> Aliases) GetOptionNames(CommandOption option)
+    {
+        var name = GetOptionName(option);
+        var aliases = new HashSet<string>();
+
+        if (option.LongNames.Count > 0)
+        {
+            foreach (var alias in option.LongNames.Skip(1))
+            {
+                aliases.Add("--" + alias);
+            }
+
+            foreach (var alias in option.ShortNames)
+            {
+                aliases.Add("-" + alias);
+            }
+        }
+        else
+        {
+            foreach (var alias in option.LongNames)
+            {
+                aliases.Add("--" + alias);
+            }
+
+            foreach (var alias in option.ShortNames.Skip(1))
+            {
+                aliases.Add("-" + alias);
+            }
+        }
+
+        return (name, aliases);
+    }
+
+    private static string GetOptionName(CommandOption option)
+    {
+        return option.LongNames.Count > 0
+            ? "--" + option.LongNames[0]
+            : "-" + option.ShortNames[0];
+    }
+}

src/Spectre.Console.Cli/Internal/Commands/VersionCommand.cs

@@ -2,7 +2,7 @@ namespace Spectre.Console.Cli;
 
 [Description("Displays the CLI library version")]
 [SuppressMessage("Performance", "CA1812: Avoid uninstantiated internal classes")]
-internal sealed class VersionCommand : Command<VersionCommand.Settings>
+internal sealed class VersionCommand : Command, IBuiltInCommand
 {
     private readonly IAnsiConsole _writer;
 
@@ -11,11 +11,7 @@ internal sealed class VersionCommand : Command<VersionCommand.Settings>
         _writer = configuration.Settings.Console.GetConsole();
     }
 
-    public sealed class Settings : CommandSettings
+    public override int Execute(CommandContext context, CancellationToken cancellationToken)
-    {
-    }
-
-    public override int Execute(CommandContext context, Settings settings)
     {
         _writer.MarkupLine(
             "[yellow]Spectre.Cli[/] version [aqua]{0}[/]",

src/Spectre.Console.Cli/Internal/Commands/XmlDocCommand.cs

@@ -2,7 +2,7 @@ namespace Spectre.Console.Cli;
 
 [Description("Generates an XML representation of the CLI configuration.")]
 [SuppressMessage("Performance", "CA1812: Avoid uninstantiated internal classes")]
-internal sealed class XmlDocCommand : Command<XmlDocCommand.Settings>
+internal sealed class XmlDocCommand : Command, IBuiltInCommand
 {
     private readonly CommandModel _model;
     private readonly IAnsiConsole _writer;
@@ -13,11 +13,7 @@ internal sealed class XmlDocCommand : Command<XmlDocCommand.Settings>
         _writer = configuration.Settings.Console.GetConsole();
     }
 
-    public sealed class Settings : CommandSettings
+    public override int Execute(CommandContext context, CancellationToken cancellationToken)
-    {
-    }
-
-    public override int Execute(CommandContext context, Settings settings)
     {
         _writer.Write(Serialize(_model), Style.Plain);
         return 0;

src/Spectre.Console.Cli/Internal/Configuration/CommandAppSettings.cs

@@ -18,6 +18,7 @@ internal sealed class CommandAppSettings : ICommandAppSettings
     public HelpProviderStyle? HelpProviderStyles { get; set; }
     public bool StrictParsing { get; set; }
     public bool ConvertFlagsToRemainingArguments { get; set; }
+    public int CancellationExitCode { get; set; }
 
     public ParsingMode ParsingMode =>
         StrictParsing ? ParsingMode.Strict : ParsingMode.Relaxed;
@@ -33,6 +34,7 @@ internal sealed class CommandAppSettings : ICommandAppSettings
         TrimTrailingPeriod = true;
         HelpProviderStyles = HelpProviderStyle.Default;
         ConvertFlagsToRemainingArguments = false;
+        CancellationExitCode = 130;
     }
 
     public bool IsTrue(Func<CommandAppSettings, bool> func, string environmentVariableName)

src/Spectre.Console.Cli/Internal/Configuration/Configurator.cs

@@ -56,19 +56,19 @@ internal sealed class Configurator : IUnsafeConfigurator, IConfigurator, IConfig
         return new CommandConfigurator(command);
     }
 
-    public ICommandConfigurator AddDelegate<TSettings>(string name, Func<CommandContext, TSettings, int> func)
+    public ICommandConfigurator AddDelegate<TSettings>(string name, Func<CommandContext, TSettings, CancellationToken, int> func)
         where TSettings : CommandSettings
     {
         var command = Commands.AddAndReturn(ConfiguredCommand.FromDelegate<TSettings>(
-            name, (context, settings) => Task.FromResult(func(context, (TSettings)settings))));
+            name, (context, settings, cancellationToken) => Task.FromResult(func(context, (TSettings)settings, cancellationToken))));
         return new CommandConfigurator(command);
     }
 
-    public ICommandConfigurator AddAsyncDelegate<TSettings>(string name, Func<CommandContext, TSettings, Task<int>> func)
+    public ICommandConfigurator AddAsyncDelegate<TSettings>(string name, Func<CommandContext, TSettings, CancellationToken, Task<int>> func)
         where TSettings : CommandSettings
     {
         var command = Commands.AddAndReturn(ConfiguredCommand.FromDelegate<TSettings>(
-            name, (context, settings) => func(context, (TSettings)settings)));
+            name, (context, settings, cancellationToken) => func(context, (TSettings)settings, cancellationToken)));
         return new CommandConfigurator(command);
     }
 

src/Spectre.Console.Cli/Internal/Configuration/ConfiguratorOfT.cs

@@ -46,21 +46,21 @@ internal sealed class Configurator<TSettings> : IUnsafeBranchConfigurator, IConf
         return configurator;
     }
 
-    public ICommandConfigurator AddDelegate<TDerivedSettings>(string name, Func<CommandContext, TDerivedSettings, int> func)
+    public ICommandConfigurator AddDelegate<TDerivedSettings>(string name, Func<CommandContext, TDerivedSettings, CancellationToken, int> func)
         where TDerivedSettings : TSettings
     {
         var command = ConfiguredCommand.FromDelegate<TDerivedSettings>(
-            name, (context, settings) => Task.FromResult(func(context, (TDerivedSettings)settings)));
+            name, (context, settings, cancellationToken) => Task.FromResult(func(context, (TDerivedSettings)settings, cancellationToken)));
 
         _command.Children.Add(command);
         return new CommandConfigurator(command);
     }
 
-    public ICommandConfigurator AddAsyncDelegate<TDerivedSettings>(string name, Func<CommandContext, TDerivedSettings, Task<int>> func)
+    public ICommandConfigurator AddAsyncDelegate<TDerivedSettings>(string name, Func<CommandContext, TDerivedSettings, CancellationToken, Task<int>> func)
         where TDerivedSettings : TSettings
     {
         var command = ConfiguredCommand.FromDelegate<TDerivedSettings>(
-            name, (context, settings) => func(context, (TDerivedSettings)settings));
+            name, (context, settings, cancellationToken) => func(context, (TDerivedSettings)settings, cancellationToken));
 
         _command.Children.Add(command);
         return new CommandConfigurator(command);

src/Spectre.Console.Cli/Internal/Configuration/ConfiguredCommand.cs

@@ -8,7 +8,7 @@ internal sealed class ConfiguredCommand
     public object? Data { get; set; }
     public Type? CommandType { get; }
     public Type SettingsType { get; }
-    public Func<CommandContext, CommandSettings, Task<int>>? Delegate { get; }
+    public Func<CommandContext, CommandSettings, CancellationToken, Task<int>>? Delegate { get; }
     public bool IsDefaultCommand { get; }
     public bool IsHidden { get; set; }
 
@@ -19,7 +19,7 @@ internal sealed class ConfiguredCommand
         string name,
         Type? commandType,
         Type settingsType,
-        Func<CommandContext, CommandSettings, Task<int>>? @delegate,
+        Func<CommandContext, CommandSettings, CancellationToken, Task<int>>? @delegate,
         bool isDefaultCommand)
     {
         Name = name;
@@ -60,7 +60,7 @@ internal sealed class ConfiguredCommand
     }
 
     public static ConfiguredCommand FromDelegate<TSettings>(
-        string name, Func<CommandContext, CommandSettings, Task<int>>? @delegate = null)
+        string name, Func<CommandContext, CommandSettings, CancellationToken, Task<int>>? @delegate = null)
         where TSettings : CommandSettings
     {
         return new ConfiguredCommand(name, null, typeof(TSettings), @delegate, false);

src/Spectre.Console.Cli/Internal/Constants.cs

@@ -5,6 +5,7 @@ internal static class CliConstants
     public const string DefaultCommandName = "__default_command";
     public const string True = "true";
     public const string False = "false";
+    public const string DumpHelpOpenCliOption = "--help-dump-opencli";
 
     public static string[] AcceptedBooleanValues { get; } = new string[]
     {
@@ -18,5 +19,6 @@ internal static class CliConstants
         public const string Version = "version";
         public const string XmlDoc = "xmldoc";
         public const string Explain = "explain";
+        public const string OpenCli = "opencli";
     }
 }

src/Spectre.Console.Cli/Internal/DelegateCommand.cs

@@ -2,16 +2,16 @@ namespace Spectre.Console.Cli;
 
 internal sealed class DelegateCommand : ICommand
 {
-    private readonly Func<CommandContext, CommandSettings, Task<int>> _func;
+    private readonly Func<CommandContext, CommandSettings, CancellationToken, Task<int>> _func;
 
-    public DelegateCommand(Func<CommandContext, CommandSettings, Task<int>> func)
+    public DelegateCommand(Func<CommandContext, CommandSettings, CancellationToken, Task<int>> func)
     {
         _func = func;
     }
 
-    public Task<int> Execute(CommandContext context, CommandSettings settings)
+    public Task<int> ExecuteAsync(CommandContext context, CommandSettings settings, CancellationToken cancellationToken)
     {
-        return _func(context, settings);
+        return _func(context, settings, cancellationToken);
     }
 
     public ValidationResult Validate(CommandContext context, CommandSettings settings)

src/Spectre.Console.Cli/Internal/Extensions/OpenCliExtensions.cs

@@ -0,0 +1,13 @@
+#if NETSTANDARD2_0
+namespace System.IO;
+
+// Polyfills needed for OpenCli.
+// This can be removed once me migrate over to the Polyfill library.
+internal static class OpenCliExtensions
+{
+    public static Task<string> ReadToEndAsync(this StreamReader reader, CancellationToken cancellationToken)
+    {
+        return reader.ReadToEndAsync();
+    }
+}
+#endif

src/Spectre.Console.Cli/Internal/Extensions/TypeExtensions.cs

@@ -16,4 +16,19 @@ internal static class TypeExtensions
 
         return false;
     }
+
+    // Taken from https://github.com/dotnet/sdk/blob/main/src/Cli/Microsoft.DotNet.Cli.Utils/Extensions/TypeExtensions.cs#L15
+    // Licensed under MIT
+    public static string ToCliTypeString(this Type type)
+    {
+        var typeName = type.FullName ?? string.Empty;
+        if (!type.IsGenericType)
+        {
+            return typeName;
+        }
+
+        var genericTypeName = typeName.Substring(0, typeName.IndexOf('`'));
+        var genericTypes = string.Join(", ", type.GenericTypeArguments.Select(generic => generic.ToCliTypeString()));
+        return $"{genericTypeName}<{genericTypes}>";
+    }
 }

src/Spectre.Console.Cli/Internal/Modelling/CommandInfo.cs

@@ -8,7 +8,7 @@ internal sealed class CommandInfo : ICommandContainer, ICommandInfo
     public object? Data { get; }
     public Type? CommandType { get; }
     public Type SettingsType { get; }
-    public Func<CommandContext, CommandSettings, Task<int>>? Delegate { get; }
+    public Func<CommandContext, CommandSettings, CancellationToken, Task<int>>? Delegate { get; }
     public bool IsDefaultCommand { get; }
     public CommandInfo? Parent { get; }
     public IList<CommandInfo> Children { get; }

src/Spectre.Console.Cli/Internal/Modelling/CommandInfoExtensions.cs

@@ -2,6 +2,16 @@ namespace Spectre.Console.Cli;
 
 internal static class CommandInfoExtensions
 {
+    public static IEnumerable<CommandArgument>? GetArguments(this CommandInfo? command)
+    {
+        return command?.Parameters.OfType<CommandArgument>();
+    }
+
+    public static IEnumerable<CommandOption>? GetOptions(this CommandInfo? command)
+    {
+        return command?.Parameters.OfType<CommandOption>();
+    }
+
     public static bool HaveParentWithOption(this CommandInfo command, CommandOption option)
     {
         var parent = command?.Parent;

src/Spectre.Console.Cli/Internal/Modelling/CommandParameter.cs

@@ -38,7 +38,7 @@ internal abstract class CommandParameter : ICommandParameterInfo, ICommandParame
         DefaultValue = defaultValue;
         PairDeconstructor = deconstructor;
         ValueProvider = valueProvider;
-        Validators = new List<ParameterValidationAttribute>(validators ?? Array.Empty<ParameterValidationAttribute>());
+        Validators = new List<ParameterValidationAttribute>(validators ?? []);
         IsRequired = required;
         IsHidden = isHidden;
     }

src/Spectre.Console.Cli/Properties/Usings.cs

@@ -9,6 +9,7 @@ global using System.IO;
 global using System.Linq;
 global using System.Reflection;
 global using System.Text;
+global using System.Threading;
 global using System.Threading.Tasks;
 global using System.Xml;
 global using Spectre.Console.Cli.Help;

src/Spectre.Console.Cli/Spectre.Console.Cli.csproj

@@ -3,11 +3,11 @@
   <PropertyGroup>
     <TargetFrameworks>net9.0;net8.0;netstandard2.0</TargetFrameworks>
     <IsPackable>true</IsPackable>
-  </PropertyGroup>
-  <PropertyGroup>
     <IsAotCompatible Condition="'$(TargetFramework)' != 'netstandard2.0'">false</IsAotCompatible>
     <IsTrimmable>false</IsTrimmable>
+    <DefineConstants>$(DefineConstants);OPENCLI_VISIBILITY_INTERNAL</DefineConstants>
   </PropertyGroup>
+
   <ItemGroup Label="REMOVE THIS">
     <InternalsVisibleTo Include="Spectre.Console.Cli.Tests"/>
   </ItemGroup>
@@ -18,6 +18,7 @@
   </PropertyGroup>
 
   <ItemGroup Label="Dependencies">
+    <PackageReference Include="OpenCli.Sources" />
     <PackageReference Include="PolySharp">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>

src/Spectre.Console.Testing/Cli/CommandAppTester.cs

@@ -98,7 +98,7 @@ public sealed class CommandAppTester
     {
         try
         {
-            Run(args, Console, c => c.PropagateExceptions());
+            RunAsync(args, Console, c => c.PropagateExceptions()).GetAwaiter().GetResult();
             throw new InvalidOperationException("Expected an exception to be thrown, but there was none.");
         }
         catch (T ex)
@@ -129,53 +129,21 @@ public sealed class CommandAppTester
     /// <returns>The result.</returns>
     public CommandAppResult Run(params string[] args)
     {
-        return Run(args, Console);
+        return RunAsync(args, Console).GetAwaiter().GetResult();
-    }
-
-    private CommandAppResult Run(string[] args, TestConsole console, Action<IConfigurator>? config = null)
-    {
-        CommandContext? context = null;
-        CommandSettings? settings = null;
-
-        var app = new CommandApp(Registrar);
-        _appConfiguration?.Invoke(app);
-
-        if (_configuration != null)
-        {
-            app.Configure(_configuration);
-        }
-
-        if (config != null)
-        {
-            app.Configure(config);
-        }
-
-        app.Configure(c => c.ConfigureConsole(console));
-        app.Configure(c => c.SetInterceptor(new CallbackCommandInterceptor((ctx, s) =>
-        {
-            context = ctx;
-            settings = s;
-        })));
-
-        var result = app.Run(args);
-
-        var output = console.Output.NormalizeLineEndings();
-        output = TestSettings.TrimConsoleOutput ? output.TrimLines().Trim() : output;
-
-        return new CommandAppResult(result, output, context, settings);
     }
 
     /// <summary>
     /// Runs the command application asynchronously.
     /// </summary>
     /// <param name="args">The arguments.</param>
+    /// <param name="cancellationToken">The token to monitor for cancellation requests.</param>
     /// <returns>The result.</returns>
-    public async Task<CommandAppResult> RunAsync(params string[] args)
+    public async Task<CommandAppResult> RunAsync(string[]? args = null, CancellationToken cancellationToken = default)
     {
-        return await RunAsync(args, Console);
+        return await RunAsync(args ?? [], Console, cancellationToken: cancellationToken);
     }
 
-    private async Task<CommandAppResult> RunAsync(string[] args, TestConsole console, Action<IConfigurator>? config = null)
+    private async Task<CommandAppResult> RunAsync(string[] args, TestConsole console, Action<IConfigurator>? config = null, CancellationToken cancellationToken = default)
     {
         CommandContext? context = null;
         CommandSettings? settings = null;
@@ -200,7 +168,7 @@ public sealed class CommandAppTester
             settings = s;
         })));
 
-        var result = await app.RunAsync(args);
+        var result = await app.RunAsync(args, cancellationToken);
 
         var output = console.Output.NormalizeLineEndings();
         output = TestSettings.TrimConsoleOutput ? output.TrimLines().Trim() : output;

src/Tests/Spectre.Console.Cli.Tests/Constants.cs

@@ -3,16 +3,17 @@ namespace Spectre.Console.Tests;
 public static class Constants
 {
     public static string[] VersionCommand { get; } =
-        new[]
+    [
-        {
+        CliConstants.Commands.Branch,
-                CliConstants.Commands.Branch,
+        CliConstants.Commands.Version
-                CliConstants.Commands.Version,
+    ];
-        };
 
     public static string[] XmlDocCommand { get; } =
-        new[]
+    [
-        {
+        CliConstants.Commands.Branch,
-                CliConstants.Commands.Branch,
+        CliConstants.Commands.XmlDoc
-                CliConstants.Commands.XmlDoc,
+    ];
-        };
+
+    public static string[] OpenCliOption { get; } =
+        [CliConstants.DumpHelpOpenCliOption];
 }

src/Tests/Spectre.Console.Cli.Tests/Data/Commands/AsynchronousCommand.cs

@@ -9,10 +9,10 @@ public sealed class AsynchronousCommand : AsyncCommand<AsynchronousCommandSettin
         _console = console;
     }
 
-    public async override Task<int> ExecuteAsync(CommandContext context, AsynchronousCommandSettings settings)
+    public async override Task<int> ExecuteAsync(CommandContext context, AsynchronousCommandSettings settings, CancellationToken cancellationToken)
     {
         // Simulate a long running asynchronous task
-        await Task.Delay(200);
+        await Task.Delay(200, cancellationToken);
 
         if (settings.ThrowException)
         {

src/Tests/Spectre.Console.Cli.Tests/Data/Commands/CatCommand.cs

@@ -2,7 +2,7 @@ namespace Spectre.Console.Tests.Data;
 
 public class CatCommand : AnimalCommand<CatSettings>
 {
-    public override int Execute(CommandContext context, CatSettings settings)
+    public override int Execute(CommandContext context, CatSettings settings, CancellationToken cancellationToken)
     {
         return 0;
     }

src/Tests/Spectre.Console.Cli.Tests/Data/Commands/DogCommand.cs

@@ -23,7 +23,7 @@ public class DogCommand : AnimalCommand<DogSettings>
         return base.Validate(context, settings);
     }
 
-    public override int Execute(CommandContext context, DogSettings settings)
+    public override int Execute(CommandContext context, DogSettings settings, CancellationToken cancellationToken)
     {
         return 0;
     }

src/Tests/Spectre.Console.Cli.Tests/Data/Commands/DumpRemainingCommand.cs

@@ -9,7 +9,7 @@ public sealed class DumpRemainingCommand : Command<EmptyCommandSettings>
         _console = console;
     }
 
-    public override int Execute(CommandContext context, EmptyCommandSettings settings)
+    public override int Execute(CommandContext context, EmptyCommandSettings settings, CancellationToken cancellationToken)
     {
         if (context.Remaining.Raw.Count > 0)
         {

src/Tests/Spectre.Console.Cli.Tests/Data/Commands/EmptyCommand.cs

@@ -2,7 +2,7 @@ namespace Spectre.Console.Tests.Data;
 
 public sealed class EmptyCommand : Command<EmptyCommandSettings>
 {
-    public override int Execute(CommandContext context, EmptyCommandSettings settings)
+    public override int Execute(CommandContext context, EmptyCommandSettings settings, CancellationToken cancellationToken)
     {
         return 0;
     }

src/Tests/Spectre.Console.Cli.Tests/Data/Commands/GenericCommand.cs

@@ -3,7 +3,7 @@ namespace Spectre.Console.Tests.Data;
 public sealed class GenericCommand<TSettings> : Command<TSettings>
     where TSettings : CommandSettings
 {
-    public override int Execute(CommandContext context, TSettings settings)
+    public override int Execute(CommandContext context, TSettings settings, CancellationToken cancellationToken)
     {
         return 0;
     }

src/Tests/Spectre.Console.Cli.Tests/Data/Commands/GiraffeCommand.cs

@@ -3,7 +3,7 @@ namespace Spectre.Console.Tests.Data;
 [Description("The giraffe command.")]
 public sealed class GiraffeCommand : Command<GiraffeSettings>
 {
-    public override int Execute(CommandContext context, GiraffeSettings settings)
+    public override int Execute(CommandContext context, GiraffeSettings settings, CancellationToken cancellationToken)
     {
         return 0;
     }

src/Tests/Spectre.Console.Cli.Tests/Data/Commands/GreeterCommand.cs

@@ -9,7 +9,7 @@ public class GreeterCommand : Command<OptionalArgumentWithDefaultValueSettings>
         _console = console;
     }
 
-    public override int Execute(CommandContext context, OptionalArgumentWithDefaultValueSettings settings)
+    public override int Execute(CommandContext context, OptionalArgumentWithDefaultValueSettings settings, CancellationToken cancellationToken)
     {
         _console.WriteLine(settings.Greeting);
         return 0;

src/Tests/Spectre.Console.Cli.Tests/Data/Commands/HiddenOptionsCommand.cs

@@ -2,7 +2,7 @@ namespace Spectre.Console.Tests.Data;
 
 public sealed class HiddenOptionsCommand : Command<HiddenOptionSettings>
 {
-    public override int Execute(CommandContext context, HiddenOptionSettings settings)
+    public override int Execute(CommandContext context, HiddenOptionSettings settings, CancellationToken cancellationToken)
     {
         return 0;
     }

src/Tests/Spectre.Console.Cli.Tests/Data/Commands/HorseCommand.cs

@@ -3,7 +3,7 @@ namespace Spectre.Console.Tests.Data;
 [Description("The horse command.")]
 public class HorseCommand : AnimalCommand<HorseSettings>
 {
-    public override int Execute(CommandContext context, HorseSettings settings)
+    public override int Execute(CommandContext context, HorseSettings settings, CancellationToken cancellationToken)
     {
         return 0;
     }

src/Tests/Spectre.Console.Cli.Tests/Data/Commands/InvalidCommand.cs

@@ -2,7 +2,7 @@ namespace Spectre.Console.Tests.Data;
 
 public sealed class InvalidCommand : Command<InvalidSettings>
 {
-    public override int Execute(CommandContext context, InvalidSettings settings)
+    public override int Execute(CommandContext context, InvalidSettings settings, CancellationToken cancellationToken)
     {
         return 0;
     }

src/Tests/Spectre.Console.Cli.Tests/Data/Commands/LionCommand.cs

@@ -3,7 +3,7 @@ namespace Spectre.Console.Tests.Data;
 [Description("The lion command.")]
 public class LionCommand : AnimalCommand<LionSettings>
 {
-    public override int Execute(CommandContext context, LionSettings settings)
+    public override int Execute(CommandContext context, LionSettings settings, CancellationToken cancellationToken)
     {
         return 0;
     }

src/Tests/Spectre.Console.Cli.Tests/Data/Commands/NoDescriptionCommand.cs

@@ -5,7 +5,7 @@ public sealed class NoDescriptionCommand : Command<EmptyCommandSettings>
     [CommandOption("-f|--foo <VALUE>")]
     public int Foo { get; set; }
 
-    public override int Execute(CommandContext context, EmptyCommandSettings settings)
+    public override int Execute(CommandContext context, EmptyCommandSettings settings, CancellationToken cancellationToken)
     {
         return 0;
     }

src/Tests/Spectre.Console.Cli.Tests/Data/Commands/OptionVectorCommand.cs

@@ -2,7 +2,7 @@ namespace Spectre.Console.Tests.Data;
 
 public class OptionVectorCommand : Command<OptionVectorSettings>
 {
-    public override int Execute(CommandContext context, OptionVectorSettings settings)
+    public override int Execute(CommandContext context, OptionVectorSettings settings, CancellationToken cancellationToken)
     {
         return 0;
     }

src/Tests/Spectre.Console.Cli.Tests/Data/Commands/ThrowingCommand.cs

@@ -2,7 +2,7 @@ namespace Spectre.Console.Tests.Data;
 
 public sealed class ThrowingCommand : Command<ThrowingCommandSettings>
 {
-    public override int Execute(CommandContext context, ThrowingCommandSettings settings)
+    public override int Execute(CommandContext context, ThrowingCommandSettings settings, CancellationToken cancellationToken)
     {
         throw new InvalidOperationException("W00t?");
     }

src/Tests/Spectre.Console.Cli.Tests/Data/Commands/TurtleCommand.cs

@@ -3,7 +3,7 @@ namespace Spectre.Console.Tests.Data;
 [Description("The turtle command.")]
 public class TurtleCommand : AnimalCommand<TurtleSettings>
 {
-    public override int Execute(CommandContext context, TurtleSettings settings)
+    public override int Execute(CommandContext context, TurtleSettings settings, CancellationToken cancellationToken)
     {
         return 0;
     }

src/Tests/Spectre.Console.Cli.Tests/Data/Commands/VersionCommand.cs

@@ -9,7 +9,7 @@ public sealed class VersionCommand : Command<VersionSettings>
         _console = console;
     }
 
-    public override int Execute(CommandContext context, VersionSettings settings)
+    public override int Execute(CommandContext context, VersionSettings settings, CancellationToken cancellationToken)
     {
         _console.WriteLine($"VersionCommand ran, Version: {settings.Version ?? string.Empty}");
 

src/Tests/Spectre.Console.Cli.Tests/Expectations/OpenCli/Generate.Output.verified.txt

@@ -0,0 +1,190 @@
+{
+  "opencli": "0.1-draft",
+  "info": {
+    "title": "my-app",
+    "version": "1.2.3"
+  },
+  "commands": [
+    {
+      "name": "animals",
+      "commands": [
+        {
+          "name": "cat",
+          "options": [
+            {
+              "name": "--agility",
+              "required": false,
+              "arguments": [
+                {
+                  "name": "VALUE",
+                  "required": true,
+                  "arity": {
+                    "minimum": 1,
+                    "maximum": 1
+                  },
+                  "metadata": [
+                    {
+                      "name": "ClrType",
+                      "value": "System.Int32"
+                    }
+                  ]
+                }
+              ],
+              "description": "The agility between 0 and 100.",
+              "recursive": false,
+              "hidden": false
+            },
+            {
+              "name": "--alive",
+              "required": false,
+              "aliases": [
+                "--not-dead",
+                "-a"
+              ],
+              "description": "Indicates whether or not the animal is alive.",
+              "recursive": false,
+              "hidden": false
+            },
+            {
+              "name": "--name",
+              "required": false,
+              "aliases": [
+                "--pet-name",
+                "-n",
+                "-p"
+              ],
+              "arguments": [
+                {
+                  "name": "VALUE",
+                  "required": true,
+                  "arity": {
+                    "minimum": 1,
+                    "maximum": 1
+                  },
+                  "metadata": [
+                    {
+                      "name": "ClrType",
+                      "value": "System.String"
+                    }
+                  ]
+                }
+              ],
+              "recursive": false,
+              "hidden": false
+            }
+          ],
+          "arguments": [
+            {
+              "name": "LEGS",
+              "required": false,
+              "arity": {
+                "minimum": 1,
+                "maximum": 1
+              },
+              "description": "The number of legs.",
+              "hidden": false,
+              "metadata": [
+                {
+                  "name": "ClrType",
+                  "value": "System.Int32"
+                }
+              ]
+            }
+          ],
+          "hidden": false,
+          "examples": []
+        },
+        {
+          "name": "dog",
+          "options": [
+            {
+              "name": "--alive",
+              "required": false,
+              "aliases": [
+                "--not-dead",
+                "-a"
+              ],
+              "description": "Indicates whether or not the animal is alive.",
+              "recursive": false,
+              "hidden": false
+            },
+            {
+              "name": "--good-boy",
+              "required": false,
+              "aliases": [
+                "-g"
+              ],
+              "recursive": false,
+              "hidden": false
+            },
+            {
+              "name": "--name",
+              "required": false,
+              "aliases": [
+                "--pet-name",
+                "-n",
+                "-p"
+              ],
+              "arguments": [
+                {
+                  "name": "VALUE",
+                  "required": true,
+                  "arity": {
+                    "minimum": 1,
+                    "maximum": 1
+                  },
+                  "metadata": [
+                    {
+                      "name": "ClrType",
+                      "value": "System.String"
+                    }
+                  ]
+                }
+              ],
+              "recursive": false,
+              "hidden": false
+            }
+          ],
+          "arguments": [
+            {
+              "name": "LEGS",
+              "required": false,
+              "arity": {
+                "minimum": 1,
+                "maximum": 1
+              },
+              "description": "The number of legs.",
+              "hidden": false,
+              "metadata": [
+                {
+                  "name": "ClrType",
+                  "value": "System.Int32"
+                }
+              ]
+            },
+            {
+              "name": "AGE",
+              "required": true,
+              "arity": {
+                "minimum": 1,
+                "maximum": 1
+              },
+              "hidden": false,
+              "metadata": [
+                {
+                  "name": "ClrType",
+                  "value": "System.Int32"
+                }
+              ]
+            }
+          ],
+          "description": "The dog command.",
+          "hidden": false,
+          "examples": []
+        }
+      ],
+      "hidden": false,
+      "examples": []
+    }
+  ]
+}

src/Tests/Spectre.Console.Cli.Tests/Properties/Usings.cs

@@ -5,6 +5,7 @@ global using System.Diagnostics.CodeAnalysis;
 global using System.Globalization;
 global using System.Linq;
 global using System.Runtime.CompilerServices;
+global using System.Threading;
 global using System.Threading.Tasks;
 global using Shouldly;
 global using Spectre.Console.Cli;

src/Tests/Spectre.Console.Cli.Tests/Unit/CommandAppTests.Async.cs

@@ -53,7 +53,7 @@ public sealed partial class CommandAppTests
             });
 
             // When
-            var result = await Record.ExceptionAsync(async () =>
+            var exception = await Record.ExceptionAsync(async () =>
                     await app.RunAsync(new[]
                         {
                         "--ThrowException",
@@ -61,10 +61,64 @@ public sealed partial class CommandAppTests
                         }));
 
             // Then
-            result.ShouldBeOfType<Exception>().And(ex =>
+            exception.ShouldBeOfType<Exception>().And(ex =>
             {
                 ex.Message.ShouldBe("Throwing exception asynchronously");
             });
         }
+
+        [Fact]
+        public async Task Should_Throw_OperationCanceledException_When_Propagated_And_Cancelled()
+        {
+            // Given
+            var app = new CommandAppTester();
+            app.SetDefaultCommand<AsynchronousCommand>();
+            app.Configure(config =>
+            {
+                config.PropagateExceptions();
+            });
+
+            // When
+            var exception = await Record.ExceptionAsync(async () =>
+                await app.RunAsync(cancellationToken: new CancellationToken(canceled: true)));
+
+            // Then
+            exception.ShouldNotBeNull();
+            exception.ShouldBeAssignableTo<OperationCanceledException>();
+        }
+
+        [Fact]
+        public async Task Should_Return_Default_Exit_Code_When_Cancelled()
+        {
+            // Given
+            var app = new CommandAppTester();
+            app.SetDefaultCommand<AsynchronousCommand>();
+
+            // When
+            var result = await app.RunAsync(cancellationToken: new CancellationToken(canceled: true));
+
+            // Then
+            result.ExitCode.ShouldBe(130);
+            result.Output.ShouldBeEmpty();
+        }
+
+        [Fact]
+        public async Task Should_Return_Custom_Exit_Code_When_Cancelled()
+        {
+            // Given
+            var app = new CommandAppTester();
+            app.SetDefaultCommand<AsynchronousCommand>();
+            app.Configure(config =>
+            {
+                config.CancellationExitCode(123);
+            });
+
+            // When
+            var result = await app.RunAsync(cancellationToken: new CancellationToken(canceled: true));
+
+            // Then
+            result.ExitCode.ShouldBe(123);
+            result.Output.ShouldBeEmpty();
+        }
     }
 }

src/Tests/Spectre.Console.Cli.Tests/Unit/CommandAppTests.Constructor.cs

@@ -28,12 +28,12 @@ public sealed partial class CommandAppTests
 
     public class NullableCommand : Command<NullableSettings>
     {
-        public override int Execute(CommandContext context, NullableSettings settings) => 0;
+        public override int Execute(CommandContext context, NullableSettings settings, CancellationToken cancellationToken) => 0;
     }
 
     public class NullableWithInitCommand : Command<NullableWithInitSettings>
     {
-        public override int Execute(CommandContext context, NullableWithInitSettings settings) => 0;
+        public override int Execute(CommandContext context, NullableWithInitSettings settings, CancellationToken cancellationToken) => 0;
     }
 
     [Fact]

src/Tests/Spectre.Console.Cli.Tests/Unit/CommandAppTests.Injection.Settings.cs

@@ -19,7 +19,7 @@ public sealed partial class CommandAppTests
                     _dep = dep;
                 }
 
-                public override int Execute(CommandContext context, CustomInheritedCommandSettings settings)
+                public override int Execute(CommandContext context, CustomInheritedCommandSettings settings, CancellationToken cancellationToken)
                 {
                     return 0;
                 }

src/Tests/Spectre.Console.Cli.Tests/Unit/CommandAppTests.Interceptor.cs

@@ -10,7 +10,7 @@ public sealed partial class CommandAppTests
             {
             }
 
-            public override int Execute(CommandContext context, Settings settings)
+            public override int Execute(CommandContext context, Settings settings, CancellationToken cancellationToken)
             {
                 return 0;
             }

src/Tests/Spectre.Console.Cli.Tests/Unit/CommandAppTests.OpenCli.cs

@@ -0,0 +1,33 @@
+namespace Spectre.Console.Tests.Unit.Cli;
+
+public sealed partial class CommandAppTests
+{
+    [ExpectationPath("OpenCli")]
+    public sealed partial class OpenCli
+    {
+        [Fact]
+        [Expectation("Generate")]
+        public Task Should_Output_OpenCli_Description()
+        {
+            // Given
+            var fixture = new CommandAppTester();
+            fixture.Configure(config =>
+            {
+                config.SetApplicationName("my-app");
+                config.SetApplicationVersion("1.2.3");
+
+                config.AddBranch("animals", animals =>
+                {
+                    animals.AddCommand<DogCommand>("dog");
+                    animals.AddCommand<CatCommand>("cat");
+                });
+            });
+
+            // When
+            var result = fixture.Run(Constants.OpenCliOption);
+
+            // Then
+            return Verifier.Verify(result.Output);
+        }
+    }
+}

src/Tests/Spectre.Console.Cli.Tests/Unit/CommandAppTests.cs

@@ -1117,7 +1117,7 @@ public sealed partial class CommandAppTests
             {
                 config.PropagateExceptions();
                 config.AddDelegate<DogSettings>(
-                    "foo", (context, settings) =>
+                    "foo", (context, settings, _) =>
                     {
                         dog = settings;
                         data = (int)context.Data;
@@ -1145,7 +1145,7 @@ public sealed partial class CommandAppTests
             {
                 cfg.AddBranch("a", d =>
                 {
-                    d.AddDelegate("b", _ => 0);
+                    d.AddDelegate("b", (_, _) => 0);
                 });
             });
 
@@ -1165,7 +1165,7 @@ public sealed partial class CommandAppTests
             var app = new CommandAppTester();
             app.Configure(cfg =>
             {
-                cfg.AddDelegate("a", _ => 0);
+                cfg.AddDelegate("a", (_, _) => 0);
             });
 
             // When
@@ -1189,7 +1189,7 @@ public sealed partial class CommandAppTests
             {
                 config.PropagateExceptions();
                 config.AddAsyncDelegate<DogSettings>(
-                    "foo", (context, settings) =>
+                    "foo", (context, settings, _) =>
                     {
                         dog = settings;
                         data = (int)context.Data;
@@ -1222,7 +1222,7 @@ public sealed partial class CommandAppTests
                 config.AddBranch<AnimalSettings>("foo", foo =>
                 {
                     foo.AddDelegate<DogSettings>(
-                        "bar", (context, settings) =>
+                        "bar", (context, settings, _) =>
                         {
                             dog = settings;
                             data = (int)context.Data;
@@ -1256,7 +1256,7 @@ public sealed partial class CommandAppTests
                 config.AddBranch<AnimalSettings>("foo", foo =>
                 {
                     foo.AddAsyncDelegate<DogSettings>(
-                        "bar", (context, settings) =>
+                        "bar", (context, settings, _) =>
                         {
                             dog = settings;
                             data = (int)context.Data;

src/Tests/Spectre.Console.Cli.Tests/Unit/Testing/CommandAppTesterTests.cs

@@ -14,7 +14,7 @@ public sealed class CommandAppTesterTests
             _console = console;
         }
 
-        public override int Execute(CommandContext context, OptionalArgumentWithDefaultValueSettings settings)
+        public override int Execute(CommandContext context, OptionalArgumentWithDefaultValueSettings settings, CancellationToken cancellationToken)
         {
             _console.Write(settings.Greeting);
             return 0;

src/Tests/Spectre.Console.Cli.Tests/Unit/Testing/InteractiveCommandTests.cs

@@ -11,7 +11,7 @@ public sealed class InteractiveCommandTests
             _console = console;
         }
 
-        public override int Execute(CommandContext context)
+        public override int Execute(CommandContext context, CancellationToken cancellationToken)
         {
             var fruits = _console.Prompt(
                 new MultiSelectionPrompt<string>()