diff --git a/CLAUDE.md b/CLAUDE.md
index 78afff1..047f73d 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -13,7 +13,32 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 5. **Branch naming** - Use format: `type/scope/short-description` (e.g., `feat/ui/settings-dialog`)
 6. **Working an issue** - Always create a new branch from an updated main branch
 7. **Check branch status before pushing** - Verify the remote tracking branch still exists. If a PR was merged/deleted, create a new branch from main instead
-8. **WPF for all UI** - All UI must be implemented using WPF (XAML/C#). No web-based technologies (HTML, JavaScript, WebView)
+8. **Microsoft coding guidelines** - Follow [Microsoft C# coding conventions](https://learn.microsoft.com/en-us/dotnet/csharp/fundamentals/coding-style/coding-conventions) and [.NET library design guidelines](https://learn.microsoft.com/en-us/dotnet/standard/design-guidelines/)
+9. **WPF for all UI** - All UI must be implemented using WPF (XAML/C#). No web-based technologies (HTML, JavaScript, WebView)
+
+---
+
+### GitHub CLI Commands
+
+```bash
+gh issue list                    # List open issues
+gh issue view <number>           # View details
+gh issue create --title "type(scope): description" --body "..."
+gh issue close <number>
+```
+
+### Conventional Commit Types
+
+| Type | Description |
+|------|-------------|
+| `feat` | New feature |
+| `fix` | Bug fix |
+| `docs` | Documentation only |
+| `refactor` | Code change that neither fixes a bug nor adds a feature |
+| `test` | Adding or updating tests |
+| `chore` | Maintenance tasks |
+| `perf` | Performance improvement |
+| `ci` | CI/CD changes |
 
 ### VSIX Development Rules
 
@@ -25,7 +50,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 **Build Configuration:**
 - Configurations: Debug and Release
-- Platform: AnyCPU
+- Platform: AnyCPU (or x64 where required)
 - Build Tools: Latest 17.* release
 - VSSDK: Latest 17.* release
 
@@ -45,44 +70,25 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 **Development Environment:**
 - Required extension: Extensibility Essentials 2022
-- Helper library: VsixCommunity Toolkit
+- Helper library: Community.VisualStudio.Toolkit (where applicable)
 
 **Documentation:**
 - README should be exciting and use emojis
 
 ---
 
-### GitHub CLI Commands
-
-```bash
-gh issue list                    # List open issues
-gh issue view <number>           # View details
-gh issue create --title "type(scope): description" --body "..."
-gh issue close <number>
-```
-
-### Conventional Commit Types
-
-| Type | Description |
-|------|-------------|
-| `feat` | New feature |
-| `fix` | Bug fix |
-| `docs` | Documentation only |
-| `refactor` | Code change that neither fixes a bug nor adds a feature |
-| `test` | Adding or updating tests |
-| `chore` | Maintenance tasks |
-
----
-
 ## Project Overview
 
 This is a Visual Studio extension that adds a right-click context menu command to open solution files, project files, or individual files in Notepad++. It targets .NET Framework 4.8 and uses the VS SDK.
 
 ## Build Commands
 
-Build the extension (requires Visual Studio with VS SDK or .NET Framework 4.8 targeting pack):
-```
-msbuild src\CodingWithCalvin.OpenInNotepadPlusPlus.slnx
+```bash
+# Build the solution
+dotnet build src/CodingWithCalvin.OpenInNotepadPlusPlus/CodingWithCalvin.OpenInNotepadPlusPlus.csproj
+
+# Build Release
+dotnet build src/CodingWithCalvin.OpenInNotepadPlusPlus/CodingWithCalvin.OpenInNotepadPlusPlus.csproj -c Release
 ```
 
 Debug by pressing F5 in Visual Studio - this launches the VS Experimental Instance (`/rootsuffix Exp`).
@@ -106,6 +112,13 @@ Path resolution in `ProjectHelpers.GetSelectedPath()` handles three selection ty
 
 The extension auto-detects Notepad++ in the default install location but allows custom paths via Tools > Options.
 
+## CI/CD
+
+GitHub Actions workflows in `.github/workflows/`:
+
+- **build.yml** - Triggered on push to main or PR. Builds and uploads VSIX artifact.
+- **publish.yml** - Manual trigger to publish to VS Marketplace.
+
 ## Development Requirements
 
 Install the [Extensibility Essentials 2022](https://marketplace.visualstudio.com/items?itemName=MadsKristensen.ExtensibilityEssentials2022) extension for Visual Studio.