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CLAUDE.md - Claude Code Extension for Visual Studio

Project Overview

Visual Studio Extension (VSIX) for VS 2022/2026 — integrates AI code assistants (Claude Code, OpenAI Codex, Cursor Agent, Open Code, Windsurf) via embedded terminal (Win32 SetParent interop).

MANDATORY: Version & Documentation Updates

Every development session that modifies code MUST update before finishing:

  1. Properties/AssemblyInfo.cs: Bump AssemblyVersion and AssemblyFileVersion
  2. source.extension.vsixmanifest: Bump Version in <Identity> tag
  3. README.md: Add ### Version X.Y entry at top of ## Version History

Build & Test

# Release
'/c/Program Files/Microsoft Visual Studio/18/Enterprise/MSBuild/Current/Bin/MSBuild.exe' ClaudeCodeExtension.sln -p:Configuration=Release -v:minimal

# Debug
'/c/Program Files/Microsoft Visual Studio/18/Enterprise/MSBuild/Current/Bin/MSBuild.exe' ClaudeCodeExtension.sln -p:Configuration=Debug -v:minimal
  • Debug: F5 in Visual Studio → experimental instance with /rootsuffix Exp
  • No automated tests — manual testing via F5 in VS 2022/2026

Publishing

When the user asks to publish the app (or any equivalent phrasing like "publish the extension", "publish to marketplace", "ship it"), run publish.cmd from the repo root. Do not invoke MSBuild or marketplace APIs manually — publish.cmd is the authoritative deployment automation.

publish.cmd performs: Clean → Rebuild Release → publish VSIX via VsixPublisher.exe with publishManifest.json. Falls back from VS 2026 to VS 2022 tool paths automatically. Uses VsixPub0038 log marker to detect success (works around VsixPublisher telemetry crash in VS 18).

publishManifest.json: Marketplace metadata — publisher dliedke, category coding, free, Q&A enabled, README.md as overview.

Project Structure

ClaudeCodeExtension/
├── Core Control (partial classes of ClaudeCodeControl):
│   ├── ClaudeCodeControl.cs             # Core initialization & orchestration
│   ├── ClaudeCodeControl.Terminal.cs    # Terminal embedding, process init, F5 forwarding
│   ├── ClaudeCodeControl.ProviderManagement.cs  # AI provider detection & switching, Caveman plugin install
│   ├── ClaudeCodeControl.TerminalIO.cs  # Terminal I/O, command execution
│   ├── ClaudeCodeControl.Diff.cs        # Diff view integration, git polling
│   ├── ClaudeCodeControl.UserInput.cs   # Keyboard input, button handlers
│   ├── ClaudeCodeControl.Workspace.cs   # Solution/workspace directory detection
│   ├── ClaudeCodeControl.ImageHandling.cs # Image paste & file attachments
│   ├── ClaudeCodeControl.Settings.cs    # Settings persistence (JSON), layout inversion
│   ├── ClaudeCodeControl.Cleanup.cs     # Resource cleanup, temp dir management
│   ├── ClaudeCodeControl.Interop.cs     # Win32 API declarations (P/Invoke)
│   ├── ClaudeCodeControl.Theme.cs       # Dark/light theme support
│   └── ClaudeCodeControl.Detach.cs      # Terminal detach/attach to separate VS tab
├── UI:
│   ├── ClaudeCodeControl.xaml / DiffViewerControl.xaml(.cs)
│   ├── ClaudeCodeToolWindow.cs / DiffViewerToolWindow.cs / DetachedTerminalToolWindow.cs
├── Diff Engine:
│   ├── Diff/DiffComputer.cs / FileChangeTracker.cs / ChangedFile.cs
├── Models & Package:
│   ├── ClaudeCodeModels.cs              # Enums & settings class
│   ├── ClaudeCodeExtensionPackage.cs    # VS package registration
│   └── SolutionEventsHandler.cs         # Solution/project open events
├── Publishing:
│   ├── publish.cmd                      # Automated marketplace deployment script
│   └── publishManifest.json             # VS Marketplace metadata

Code Style & Conventions

  • Language: C# / .NET Framework 4.7.2
  • File Headers: Every .cs file must include copyright header (Daniel Liedke, 2026)
  • Namespaces: ClaudeCodeVS (controls/models), ClaudeCodeExtension (package)
  • Naming: PascalCase public, _camelCase private fields, camelCase locals
  • Error Handling: try-catch + Debug.WriteLine; MessageBox for user-facing errors
  • Thread Safety: ThreadHelper.ThrowIfNotOnUIThread() / SwitchToMainThreadAsync()
  • Settings: JSON at %LocalAppData%\ClaudeCodeExtension\claudecode-settings.json
/* *******************************************************************************************************************
 * Application: ClaudeCodeExtension
 * Autor:  Daniel Carvalho Liedke
 * Copyright © Daniel Carvalho Liedke 2026
 * Usage and reproduction in any manner whatsoever without the written permission of Daniel Carvalho Liedke is strictly forbidden.
 * Purpose: <description>
 * *******************************************************************************************************************/

Architecture — Key Non-Obvious Details

Terminal Embedding (Terminal.cs)

  • Two terminal modes: Command Prompt (conhost) and Windows Terminal (wt.exe), via _settings.SelectedTerminalType
  • Lifecycle serialization: _terminalLifecycleSemaphore prevents overlapping start/stop transitions
  • Session ID tracking: _terminalStartupSessionId discards stale startup work when a new terminal start is triggered before the old one finishes
  • SetParent() retry: Up to 3 attempts with 200ms delay and Win32 error logging (Marshal.GetLastWin32Error()), re-applies window styles between retries
  • Conhost handle discovery: FindMainWindowHandleByConhostAsync() retries with 5s then 10s timeouts; uses ToolHelp32 (CreateToolhelp32Snapshot) for child PID lookup
  • WT embedding: Finds CASCADIA_HOSTING_WINDOW_CLASS, embeds with WS_CHILD, calculates tab bar height offset
  • Terminal hidden from taskbar: WS_EX_TOOLWINDOW + clear WS_EX_APPWINDOW
  • F5 forwarding: Low-level keyboard hook (WH_KEYBOARD_LL) intercepts F5/Ctrl+F5/Shift+F5 → VS debug commands via DTE
  • Mouse hook (WH_MOUSE_LL): Tracks Ctrl+Scroll zoom delta (persisted); converts plain left-drag to SHIFT+drag for WT text selection
  • Post-startup: SchedulePostStartupTerminalAdjustments() runs deferred resize + zoom replay; SchedulePostSolutionLoadTerminalRefresh() does 200/500/1000ms repaint passes after solution load
  • Fresh PATH from registry: GetFreshPathFromRegistry() reads PATH from HKLM and HKCU registry keys to detect newly installed tools (e.g. Windows Terminal) without requiring VS restart

Command patterns:

Windows: cmd.exe /k chcp 65001 >nul && cd /d "{dir}" && ping localhost -n 3 >nul && cls && {command}
WSL:     cmd.exe /k chcp 65001 >nul && cls && wsl bash -lic "cd {wslPath} && {command}"

WSL path conversion (ConvertToWslPath()): \\wsl.localhost\distro\path → /path, C:\... → /mnt/c/...

WSL shell mode: Uses bash -lic (login + interactive) to load .profile/.bash_profile PATH entries — applies to all WSL providers (Claude Code WSL, Codex WSL, Cursor Agent WSL, Windsurf)

Provider Detection (ProviderManagement.cs)

  • Caching: _providerCache with 5-min TTL, separate _wslCache for WSL installation status
  • Thread-safe cache: _cacheLock object for synchronized access; IsCacheValid() checks timestamp expiry
  • Claude Code detection: Two-tier — first checks native path (%USERPROFILE%\.local\bin\claude.exe), then falls back to where claude (PATHEXT-aware, finds both claude.exe from winget and claude.cmd from NPM)
  • WSL detection: bash -lc (login shell) for which commands — avoids .bashrc noise; retries 2x with 8s/20s timeouts for cold boot
  • Early-exit logic: Only stops retrying when stdout has content (ignores stderr-only shell warnings)
  • Notification flags: Static booleans (one per provider) ensure install pop-ups show only once per VS session
  • Model menus: ModelContextMenu_Opened() toggles Claude items vs Windsurf items based on active provider

Caveman Plugin (ProviderManagement.cs)

  • Not a standalone provider — a Claude Code plugin (JuliusBrussee/caveman) for ultra-compressed communication
  • Menu item: "Install Caveman" in the model context menu, visible only when Claude Code or Claude Code (WSL) is running
  • Installation flow: Sends sequential /plugin slash commands into the active Claude Code session with timed delays:
    1. /plugin marketplace add JuliusBrussee/caveman (7s wait)
    2. /plugin install caveman@caveman --scope user (4s wait)
    3. Enter key to confirm trust prompts (1.5s wait)
    4. /reload-plugins (3s wait)
    5. /caveman (2s wait)
    6. yes to confirm activation
  • Confirmation dialog: Shows all commands that will be sent before execution

Terminal I/O (TerminalIO.cs)

  • Paste mechanism: Saves full clipboard state → sets text → right-clicks terminal center → sends Enter → restores clipboard
  • Clipboard retry: Up to 10 retries with 100ms delay for CLIPBRD_E_CANT_OPEN
  • Enter key varies by provider: WM_CHAR (Claude/OpenCode), KEYDOWN/KEYUP (WSL), double-Enter (Codex)

Settings (Settings.cs)

  • _isInitializing guard: Prevents SaveSettings() during LoadSettings()
  • [JsonExtensionData]: Preserves unknown JSON properties across DLL versions
  • Layout inversion: ApplyLayout() swaps prompt and terminal grid rows, adjusts MinHeights (Terminal 20px, Prompt 80px), hides/shows terminal GroupBox header, reorders prompt section controls

Workspace (Workspace.cs)

Priority: DTE solution dir → active project dir → IVsSolution dir → current dir with .sln/.csproj → My Documents

Detach (Detach.cs)

Re-parents terminal to/from DetachedTerminalToolWindow via SetParent(). Auto-reattaches when detached tab is closed.

Data Models (ClaudeCodeModels.cs)

enum AiProvider { ClaudeCode, ClaudeCodeWSL, Codex, CodexNative, CursorAgent, CursorAgentNative, OpenCode, Windsurf }
enum ClaudeModel { Opus, Sonnet, Haiku }
enum WindsurfModel { ClaudeOpus, ClaudeSonnet, Codex, GeminiPro }
enum EffortLevel { Auto, Low, Medium, High, Max }
enum TerminalType { CommandPrompt, WindowsTerminal }

Key settings: SendWithEnter, SplitterPosition (236px default), SelectedProvider, SelectedClaudeModel, SelectedWindsurfModel, PromptHistory (max 50), AutoOpenChangesOnPrompt, ClaudeDangerouslySkipPermissions, CodexFullAuto, CursorAgentAutoRun, WindsurfDangerousMode, SelectedEffortLevel, CustomWorkingDirectory, SelectedTerminalType, IsTerminalDetached, PromptFontSize (8–24pt), TerminalZoomDelta, InvertLayout

Supported AI Providers

Provider Enum Platform Executable Exit Command
Claude Code ClaudeCode Windows claude exit
Claude Code (WSL) ClaudeCodeWSL WSL claude exit
Codex CodexNative Windows codex Double CTRL+C
Codex (WSL) Codex WSL codex Double CTRL+C
Cursor Agent CursorAgentNative Windows agent.exe / agent.cmd exit
Cursor Agent (WSL) CursorAgent WSL cursor-agent exit
Open Code OpenCode Windows opencode exit
Windsurf (WSL) Windsurf WSL devin exit

Plugin: Caveman (JuliusBrussee/caveman) — installable into Claude Code sessions via model menu

Key GUIDs

Identifier GUID
Package 3fa29425-3add-418f-82f6-0c9b7419b2ca
VSIX Identity 87de5d13-743e-46b3-b05e-24e1cbeca0c3
Command Set 11111111-2222-3333-4444-555555555555
Detached Terminal Window B2C3D4E5-F6A7-8901-BCDE-FA2345678901
Tool Window Command ID 0x0100

Key Dependencies

Package Version Purpose
Microsoft.VisualStudio.SDK 17.0.32112.339 VS extensibility APIs
Microsoft.VSSDK.BuildTools 17.14.2101 VSIX build tools
Newtonsoft.Json 13.0.3 Settings serialization
DiffPlex 1.7.2 Diff computation

Adding a New AI Provider (Checklist)

  1. ClaudeCodeModels.cs: Add to AiProvider enum; add settings property if needed
  2. ProviderManagement.cs: Add detection method, cache logic, install instructions, notification flag, menu handlers, UpdateProviderSelection(), ProviderContextMenu_Opened()
  3. Terminal.cs: Add command building in StartEmbeddedTerminalAsync() (both CMD and WT paths), providerTitle switch, InitializeTerminalAsync(), RestartTerminalWithSelectedProviderAsync(), UpdateAgentButton_Click(), Get{Provider}Command()
  4. TerminalIO.cs: Add Enter key behavior in SendEnterKey(); add to isOtherWSLProvider if WSL
  5. UserInput.cs: Add to isWSLProvider check for WSL path conversion
  6. Detach.cs: Add to GetCurrentProviderName() switch
  7. ClaudeCodeControl.xaml: Add context menu item; add settings item if provider has flags
  8. README.md: Document in Features, System Requirements, AI Provider Menu, Updating sections