adding-commands

Adding Commands to Visual Studio Extensions

A command is any user-invokable action — menu items, toolbar buttons, context menu entries, keyboard shortcuts. Each command has an ID, a display name, an optional icon, a placement (where it appears in the UI), and an execution handler.

Commands are the primary way users interact with an extension — without one, your extension has no entry point.

When to use this vs. alternatives:

• Add an action to a menu, toolbar, or context menu → this skill
• Add a context menu entry specifically → combine with vs-context-menu
• Show/hide commands based on context → combine with vs-command-visibility
• Create commands that change text/state dynamically → vs-dynamic-commands
• React to existing VS commands (intercept Copy, Build, etc.) → vs-command-intercept

File organization

Every command class should be in its own .cs file inside a top-level Commands/ folder in the project:

MyExtension/
├── Commands/
│   ├── BuildSolutionCommand.cs
│   ├── FormatDocumentCommand.cs
│   └── OpenSettingsCommand.cs
├── MyExtensionPackage.cs          ← (Toolkit / VSSDK only)
├── MyExtension.csproj
└── ...

One class per file. Name the file to match the class name.

---

1. VisualStudio.Extensibility (out-of-process, recommended)

Commands are self-contained classes that extend Command. No .vsct file is needed — placement, icon, and metadata are declared in code via CommandConfiguration.

NuGet package: Microsoft.VisualStudio.Extensibility Key namespaces: Microsoft.VisualStudio.Extensibility, Microsoft.VisualStudio.Extensibility.Commands

Basic command

Commands/BuildSolutionCommand.cs:

using Microsoft.VisualStudio.Extensibility;
using Microsoft.VisualStudio.Extensibility.Commands;

namespace MyExtension.Commands;

[VisualStudioContribution]
internal class BuildSolutionCommand : Command
{
    public BuildSolutionCommand(VisualStudioExtensibility extensibility)
        : base(extensibility) { }

    public override CommandConfiguration CommandConfiguration => new("Build Solution")
    {
        Placements = [CommandPlacement.KnownPlacements.ToolsMenu],
        Icon = new(ImageMoniker.KnownValues.BuildSolution, IconSettings.IconAndText),
    };

    public override async Task ExecuteCommandAsync(IClientContext context, CancellationToken ct)
    {
        // Command logic here
        await this.Extensibility.Shell().ShowPromptAsync(
            "Build started.",
            PromptOptions.OK,
            ct);
    }
}

Command placements

Use CommandPlacement.KnownPlacements for standard locations:

Placement	Menu location
ToolsMenu	Tools menu
ViewOtherWindowsMenu	View > Other Windows
ExtensionsMenu	Extensions menu

For custom parent groups, use CommandPlacement.VsctParent with the GUID and ID of the parent group from the .vsct schema.

Icons

Use ImageMoniker.KnownValues for built-in VS icons:

Icon = new(ImageMoniker.KnownValues.BuildSolution, IconSettings.IconAndText),
Icon = new(ImageMoniker.KnownValues.Settings, IconSettings.IconOnly),
Icon = new(ImageMoniker.KnownValues.AddFile, IconSettings.IconAndText),

IconSettings:

• IconAndText — shows both the icon and the display name.
• IconOnly — shows only the icon (used in toolbars).

Custom icons

Place images as embedded resources and reference by custom moniker:

[VisualStudioContribution]
internal static ImageMoniker MyCustomIcon = new("MyCustomIcon", KnownImageIds.ImageCatalogGuid);

Shortcuts

public override CommandConfiguration CommandConfiguration => new("Format Document")
{
    Placements = [CommandPlacement.KnownPlacements.ToolsMenu],
    Shortcuts = [new CommandShortcutConfiguration(ModifierKey.Control, Key.K, ModifierKey.Control, Key.D)],
};

Conditional visibility

Show a command only when specific conditions are met:

public override CommandConfiguration CommandConfiguration => new("Analyze C# File")
{
    Placements = [CommandPlacement.KnownPlacements.ToolsMenu],
    Icon = new(ImageMoniker.KnownValues.CSFileNode, IconSettings.IconAndText),
    VisibleWhen = ActivationConstraint.ClientContext(
        ClientContextKey.Shell.ActiveSelectionFileName, @"\.cs$"),
};

Enabling/disabling at runtime

Override CommandConfiguration.EnabledWhen or toggle state in ExecuteCommandAsync:

public override CommandConfiguration CommandConfiguration => new("Debug Command")
{
    Placements = [CommandPlacement.KnownPlacements.ToolsMenu],
    EnabledWhen = ActivationConstraint.SolutionState(SolutionState.FullyLoaded),
};

---

2. VSIX Community Toolkit (in-process)

Commands extend BaseCommand<T>. Each command is its own class and file. Commands must be declared in a .vsct file, which defines the button, its parent group, its icon, and keyboard shortcut.

NuGet package: Community.VisualStudio.Toolkit Key namespace: Community.VisualStudio.Toolkit

Step 1: Define the command in the .vsct file

The .vsct file declares the command table — symbols, groups, buttons, and their placements. Every command button needs an entry here.

MyExtensionPackage.vsct:

<?xml version="1.0" encoding="utf-8"?>
<CommandTable xmlns="http://schemas.microsoft.com/VisualStudio/2005-10-18/CommandTable"
              xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <Extern href="stdidcmd.h"/>
  <Extern href="vsshlids.h"/>
  <Include href="KnownImageIds.vsct"/>

  <Commands package="guidMyExtensionPackage">

    <!-- Define a command group -->
    <Groups>
      <Group guid="guidMyExtensionCmdSet" id="MyMenuGroup" priority="0x0600">
        <!-- Parent the group under the Tools menu -->
        <Parent guid="guidSHLMainMenu" id="IDM_VS_MENU_TOOLS"/>
      </Group>
    </Groups>

    <!-- Define the command buttons -->
    <Buttons>
      <Button guid="guidMyExtensionCmdSet" id="BuildSolutionCommandId" priority="0x0100" type="Button">
        <Parent guid="guidMyExtensionCmdSet" id="MyMenuGroup"/>
        <Icon guid="ImageCatalogGuid" id="BuildSolution"/>
        <CommandFlag>IconIsMoniker</CommandFlag>
        <Strings>
          <ButtonText>Build Solution</ButtonText>
        </Strings>
      </Button>

      <Button guid="guidMyExtensionCmdSet" id="FormatDocumentCommandId" priority="0x0200" type="Button">
        <Parent guid="guidMyExtensionCmdSet" id="MyMenuGroup"/>
        <Icon guid="ImageCatalogGuid" id="FormatDocument"/>
        <CommandFlag>IconIsMoniker</CommandFlag>
        <Strings>
          <ButtonText>Format Document</ButtonText>
        </Strings>
      </Button>

      <Button guid="guidMyExtensionCmdSet" id="OpenSettingsCommandId" priority="0x0300" type="Button">
        <Parent guid="guidMyExtensionCmdSet" id="MyMenuGroup"/>
        <Icon guid="ImageCatalogGuid" id="Settings"/>
        <CommandFlag>IconIsMoniker</CommandFlag>
        <Strings>
          <ButtonText>Open Settings</ButtonText>
        </Strings>
      </Button>
    </Buttons>

  </Commands>

  <!-- Symbol definitions -->
  <Symbols>
    <GuidSymbol name="guidMyExtensionPackage" value="{YOUR-PACKAGE-GUID}" />

    <GuidSymbol name="guidMyExtensionCmdSet" value="{YOUR-CMDSET-GUID}">
      <IDSymbol name="MyMenuGroup" value="0x1020" />
      <IDSymbol name="BuildSolutionCommandId" value="0x0100" />
      <IDSymbol name="FormatDocumentCommandId" value="0x0101" />
      <IDSymbol name="OpenSettingsCommandId" value="0x0102" />
    </GuidSymbol>
  </Symbols>

</CommandTable>

Key rules for .vsct buttons with KnownMonikers icons

1. Include the image catalog: Add <Include href="KnownImageIds.vsct"/> at the top of the <CommandTable>.
2. Reference the moniker: On the <Icon> element, use guid="ImageCatalogGuid" and set id to the KnownMoniker name (e.g., BuildSolution, Settings, FormatDocument).
3. Add the IconIsMoniker flag: Inside each <Button>, add <CommandFlag>IconIsMoniker</CommandFlag>. Without this flag, VS treats the icon reference as a legacy bitmap strip and the icon won't display.

Common KnownMonikers for commands

KnownMoniker name	Use case
BuildSolution	Build / compile actions
FormatDocument	Formatting commands
Settings	Settings / configuration
AddFile	Add or create file
Delete	Remove / delete
Refresh	Refresh / reload
Search	Search / find
Save	Save operations
RunOutline	Run / execute
CSFileNode	C# file operations
StatusInformation	Information / about
StatusWarning	Warnings
StatusError	Error indicators

To browse the full list of 3,800+ KnownMonikers, install the KnownMonikers Explorer extension from the Visual Studio Marketplace. It adds a tool window (View > Other Windows > KnownMonikers Explorer) that lets you search and preview all available monikers.

Adding a keyboard shortcut in .vsct

<KeyBindings>
  <KeyBinding guid="guidMyExtensionCmdSet" id="FormatDocumentCommandId"
              editor="guidVSStd97"
              key1="K" mod1="Control"
              key2="D" mod2="Control" />
</KeyBindings>

Place the <KeyBindings> block as a sibling of <Commands> inside <CommandTable>.

Parenting buttons under different menus

Change the <Parent> on the <Group> to target a different menu:

Menu	guid	id
Tools	guidSHLMainMenu	IDM_VS_MENU_TOOLS
Edit	guidSHLMainMenu	IDM_VS_MENU_EDIT
View	guidSHLMainMenu	IDM_VS_MENU_VIEW
Extensions	guidSHLMainMenu	IDM_VS_MENU_EXTENSIONS
Solution Explorer context menu	guidSHLMainMenu	IDM_VS_CTXT_SOLNNODE
Code window context menu	guidSHLMainMenu	IDM_VS_CTXT_CODEWIN
Project context menu	guidSHLMainMenu	IDM_VS_CTXT_PROJNODE

Step 2: Create the command class

Each command gets its own file in the Commands/ folder.

Commands/BuildSolutionCommand.cs:

using Community.VisualStudio.Toolkit;
using Microsoft.VisualStudio.Shell;

namespace MyExtension.Commands;

[Command(PackageIds.BuildSolutionCommandId)]
internal sealed class BuildSolutionCommand : BaseCommand<BuildSolutionCommand>
{
    protected override async Task ExecuteAsync(OleMenuCmdEventArgs e)
    {
        await VS.MessageBox.ShowAsync("Build Solution", "Starting build...");
    }
}

Commands/FormatDocumentCommand.cs:

using Community.VisualStudio.Toolkit;
using Microsoft.VisualStudio.Shell;

namespace MyExtension.Commands;

[Command(PackageIds.FormatDocumentCommandId)]
internal sealed class FormatDocumentCommand : BaseCommand<FormatDocumentCommand>
{
    protected override async Task ExecuteAsync(OleMenuCmdEventArgs e)
    {
        await VS.MessageBox.ShowAsync("Format Document", "Formatting...");
    }
}

Commands/OpenSettingsCommand.cs:

using Community.VisualStudio.Toolkit;
using Microsoft.VisualStudio.Shell;

namespace MyExtension.Commands;

[Command(PackageIds.OpenSettingsCommandId)]
internal sealed class OpenSettingsCommand : BaseCommand<OpenSettingsCommand>
{
    protected override async Task ExecuteAsync(OleMenuCmdEventArgs e)
    {
        await VS.MessageBox.ShowAsync("Settings", "Opening settings...");
    }
}

Step 3: Register commands in the package

using System;
using System.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
using Community.VisualStudio.Toolkit;
using Microsoft.VisualStudio.Shell;

[PackageRegistration(UseManagedResourcesOnly = true, AllowsBackgroundLoading = true)]
[InstalledProductRegistration(Vsix.Name, Vsix.Description, Vsix.Version)]
[ProvideMenuResource("Menus.ctmenu", 1)]
[Guid(PackageGuids.MyExtensionPackageString)]
public sealed class MyExtensionPackage : ToolkitPackage
{
    protected override async Task InitializeAsync(CancellationToken cancellationToken, IProgress<ServiceProgressData> progress)
    {
        await this.RegisterCommandsAsync();
    }
}

RegisterCommandsAsync() discovers all BaseCommand<T> subclasses in the assembly and registers them automatically.

Enabling/disabling at runtime (Community Toolkit)

Override BeforeQueryStatus to toggle the enabled or visible state:

protected override void BeforeQueryStatus(EventArgs e)
{
    Command.Enabled = /* your condition */;
    Command.Visible = /* your condition */;
}

---

3. VSSDK (in-process, legacy)

Commands are registered manually with OleMenuCommandService. Like the Toolkit, commands must be declared in a .vsct file (see the .vsct example in section 2 — the file format is identical).

NuGet package: Microsoft.VisualStudio.SDK Key namespaces: Microsoft.VisualStudio.Shell, Microsoft.VisualStudio.Shell.Interop

Step 1: Define buttons in the .vsct file

Use the same .vsct structure shown in section 2. The button definitions, <Include href="KnownImageIds.vsct"/>, guid="ImageCatalogGuid", and <CommandFlag>IconIsMoniker</CommandFlag> rules are identical.

Step 2: Create the command class

Each command is a standalone class with a static Initialize method and a private constructor. Keep each in its own file under Commands/.

Commands/BuildSolutionCommand.cs:

using System;
using System.ComponentModel.Design;
using Microsoft.VisualStudio.Shell;

namespace MyExtension.Commands;

internal sealed class BuildSolutionCommand
{
    public static readonly Guid CommandSet = new("YOUR-CMDSET-GUID");
    public const int CommandId = 0x0100;

    private readonly AsyncPackage _package;

    private BuildSolutionCommand(AsyncPackage package, OleMenuCommandService commandService)
    {
        _package = package ?? throw new ArgumentNullException(nameof(package));
        commandService = commandService ?? throw new ArgumentNullException(nameof(commandService));

        var menuCommandId = new CommandID(CommandSet, CommandId);
        var menuItem = new MenuCommand(Execute, menuCommandId);
        commandService.AddCommand(menuItem);
    }

    public static async Task InitializeAsync(AsyncPackage package)
    {
        await ThreadHelper.JoinableTaskFactory.SwitchToMainThreadAsync(package.DisposalToken);

        var commandService = await package.GetServiceAsync(typeof(IMenuCommandService)) as OleMenuCommandService;
        _ = new BuildSolutionCommand(package, commandService);
    }

    private void Execute(object sender, EventArgs e)
    {
        ThreadHelper.ThrowIfNotOnUIThread();

        VsShellUtilities.ShowMessageBox(
            _package,
            "Starting build...",
            "Build Solution",
            OLEMSGICON.OLEMSGICON_INFO,
            OLEMSGBUTTON.OLEMSGBUTTON_OK,
            OLEMSGDEFBUTTON.OLEMSGDEFBUTTON_FIRST);
    }
}

Commands/FormatDocumentCommand.cs:

using System;
using System.ComponentModel.Design;
using Microsoft.VisualStudio.Shell;

namespace MyExtension.Commands;

internal sealed class FormatDocumentCommand
{
    public static readonly Guid CommandSet = new("YOUR-CMDSET-GUID");
    public const int CommandId = 0x0101;

    private readonly AsyncPackage _package;

    private FormatDocumentCommand(AsyncPackage package, OleMenuCommandService commandService)
    {
        _package = package ?? throw new ArgumentNullException(nameof(package));
        commandService = commandService ?? throw new ArgumentNullException(nameof(commandService));

        var menuCommandId = new CommandID(CommandSet, CommandId);
        var menuItem = new MenuCommand(Execute, menuCommandId);
        commandService.AddCommand(menuItem);
    }

    public static async Task InitializeAsync(AsyncPackage package)
    {
        await ThreadHelper.JoinableTaskFactory.SwitchToMainThreadAsync(package.DisposalToken);

        var commandService = await package.GetServiceAsync(typeof(IMenuCommandService)) as OleMenuCommandService;
        _ = new FormatDocumentCommand(package, commandService);
    }

    private void Execute(object sender, EventArgs e)
    {
        ThreadHelper.ThrowIfNotOnUIThread();

        VsShellUtilities.ShowMessageBox(
            _package,
            "Formatting document...",
            "Format Document",
            OLEMSGICON.OLEMSGICON_INFO,
            OLEMSGBUTTON.OLEMSGBUTTON_OK,
            OLEMSGDEFBUTTON.OLEMSGDEFBUTTON_FIRST);
    }
}

Step 3: Initialize commands in the package

using System;
using System.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.VisualStudio.Shell;

[PackageRegistration(UseManagedResourcesOnly = true, AllowsBackgroundLoading = true)]
[InstalledProductRegistration("#110", "#112", "1.0")]
[ProvideMenuResource("Menus.ctmenu", 1)]
[Guid("YOUR-PACKAGE-GUID")]
public sealed class MyExtensionPackage : AsyncPackage
{
    protected override async Task InitializeAsync(CancellationToken cancellationToken, IProgress<ServiceProgressData> progress)
    {
        await BuildSolutionCommand.InitializeAsync(this);
        await FormatDocumentCommand.InitializeAsync(this);
        await OpenSettingsCommand.InitializeAsync(this);
    }
}

Each command must be initialized explicitly — there is no auto-discovery in raw VSSDK.

Dynamic enable/disable (VSSDK)

Use OleMenuCommand instead of MenuCommand to get BeforeQueryStatus:

var menuCommandId = new CommandID(CommandSet, CommandId);
var menuItem = new OleMenuCommand(Execute, menuCommandId);
menuItem.BeforeQueryStatus += (s, e) =>
{
    ThreadHelper.ThrowIfNotOnUIThread();
    menuItem.Enabled = /* your condition */;
    menuItem.Visible = /* your condition */;
};
commandService.AddCommand(menuItem);

---

Key guidance

• One command per file. Place all command files in a root Commands/ folder. Name the file after the class.
• VisualStudio.Extensibility — No .vsct file needed. Placement, icons, and shortcuts are declared in CommandConfiguration. Use ImageMoniker.KnownValues for icons.
• Community Toolkit & VSSDK — Both require a .vsct file. To use KnownMonikers as icons: (1) add <Include href="KnownImageIds.vsct"/>, (2) set guid="ImageCatalogGuid" on <Icon>, and (3) add <CommandFlag>IconIsMoniker</CommandFlag> to the button.
• [ProvideMenuResource("Menus.ctmenu", 1)] is required on the package for Toolkit and VSSDK — without it, VS won't load the command table.
• Prefer AsyncPackage with AllowsBackgroundLoading = true for VSSDK. The Toolkit uses ToolkitPackage which already handles this.
• Never run heavy logic on the UI thread inside Execute. Offload to a background thread and switch back with JoinableTaskFactory.SwitchToMainThreadAsync() only when needed.

Troubleshooting

• Command doesn't appear in any menu: For Extensibility, verify the [VisualStudioContribution] attribute is on the command class and that Placements is set in CommandConfiguration. For Toolkit/VSSDK, verify [ProvideMenuResource("Menus.ctmenu", 1)] is on the package, the .vsct button definition exists, and the GUID/ID symbols match between .vsct and code.
• Icon doesn't display (Toolkit / VSSDK): Ensure all three pieces are in the .vsct button: <Include href="KnownImageIds.vsct"/> at the top of the command table, guid="ImageCatalogGuid" on the <Icon> element, and <CommandFlag>IconIsMoniker</CommandFlag> on the button. Missing any one of these causes a blank icon with no error.
• Command is visible but always disabled: For Extensibility, check EnabledWhen constraints in CommandConfiguration. For Toolkit/VSSDK, check your BeforeQueryStatus handler — it may be setting Enabled = false unconditionally.
• "Command already registered" exception at startup: Two commands share the same GUID + ID pair. Each command must have a unique CommandID. Check for duplicate IDSymbol values in your .vsct file.
• Command handler never fires: For Toolkit, confirm the [Command(PackageIds.XYZ)] attribute references the correct generated constant. For VSSDK, confirm InitializeAsync calls your command's InitializeAsync and that the CommandID matches the .vsct symbol.
• Keyboard shortcut doesn't work: For Extensibility, verify the Shortcuts array in CommandConfiguration. For .vsct, ensure the <KeyBinding> element uses editor="guidVSStd97" for global scope and that the key combo doesn't conflict with an existing VS binding.

What NOT to do

Do NOT do heavy work in Execute/ExecuteCommandAsync on the UI thread — offload with Task.Run or await TaskScheduler.Default. See vs-async-threading.

Do NOT forget [ProvideMenuResource("Menus.ctmenu", 1)] on the package class (Toolkit/VSSDK) — without it, all buttons silently fail to appear.

Do NOT reuse GUID + ID pairs across commands — duplicates cause a startup exception. Each command needs a unique CommandID.

Do NOT hard-code command GUIDs/IDs as inline strings. Use constants in a shared class or Toolkit's generated PackageIds/PackageGuids.

Do NOT use synchronous Package — use AsyncPackage (VSSDK) or ToolkitPackage (Toolkit). Sync packages degrade IDE launch time.

See also

• vs-context-menu
• vs-command-visibility
• vs-dynamic-commands
• vs-command-intercept
• vs-async-threading
• vs-error-handling

References

• Commands (VisualStudio.Extensibility)
• Menus and Commands (VSSDK)
• Visual Studio Command Table (.vsct) Files
• KnownMonikers (ImageLibrary)
• VSIX Community Toolkit Commands Recipe