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-# CLAUDE.md
-
-This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
-
-## Build Commands
-
-| Task | Command |
-|------|---------|
-| First build / NuGet restore | `tools\build\build-essentials.cmd` |
-| Build current folder | `tools\build\build.cmd` |
-| Build with options | `tools\build\build.ps1 -Platform x64 -Configuration Release` |
-
-**Build discipline:**
-- `cd` to the project folder (`.csproj`/`.vcxproj`) before building
-- Exit code 0 = success; non-zero = failure
-- On failure, check `build.<config>.<platform>.errors.log`
-- Run `build-essentials.cmd` first if NuGet packages are missing
-
-## Running Tests
-
-- Build test project first, wait for exit code 0
-- Run via VS Test Explorer (`Ctrl+E, T`) or `vstest.console.exe`
-- **Avoid `dotnet test`** - use VS Test Explorer or vstest.console.exe
-- Test projects are named `<Product>*UnitTests` or `<Product>*UITests`
-- UI tests require WinAppDriver v1.2.1 and Developer Mode enabled
-
-## Architecture
-
-PowerToys is a collection of Windows productivity utilities with a modular architecture.
-
-| Component | Location | Purpose |
-|-----------|----------|---------|
-| Runner | `src/runner/` | Main executable - module loader, tray icon, hotkey management |
-| Settings UI | `src/settings-ui/` | WinUI/WPF configuration app |
-| Modules | `src/modules/` | Individual utilities (30+ modules) |
-| Common Libraries | `src/common/` | Shared code: logging, IPC, settings, utilities |
-
-**Module types:**
-1. Simple modules - entirely in module interface DLL (e.g., Mouse Pointer Crosshairs)
-2. External application launchers - start separate executables (e.g., Color Picker)
-3. Context handler modules - File Explorer shell extensions (e.g., Power Rename)
-4. Registry-based modules - preview/thumbnail handlers (e.g., Power Preview)
-
-**IPC:** Runner ↔ Settings UI communicate via Windows Named Pipes using JSON messages.
-
-## Critical Guidelines
-
-**IPC contracts:** When modifying JSON message format between Runner and Settings UI:
-- Update both `src/runner/` and `src/settings-ui/` in the same PR
-- Add migration logic for settings schema changes
-- Test both directions of communication
-
-**Common libraries (`src/common/`):** Changes have wide impact:
-- Avoid breaking public headers/APIs; update all callers if changed
-- No logging in hot paths (hooks, timers, tight loops)
-- New dependencies require PM approval and must be added to `NOTICE.md`
-
-**Style enforcement:**
-- C++: `src/.clang-format` (run `src/codeAnalysis/format_sources.ps1`)
-- C#: `src/.editorconfig` with StyleCop.Analyzers
-- XAML: XamlStyler (run `.\.pipelines\applyXamlStyling.ps1 -Main`)
-
-**General:**
-- Atomic PRs: one logical change, no drive-by refactors
-- Preserve GPO and elevation behaviors
-- Initialize git submodules: `git submodule update --init --recursive`
-
-## Validation Checklist
-
-- [ ] Build clean with exit code 0
-- [ ] Tests updated and passing locally
-- [ ] No unintended ABI breaks or schema changes
-- [ ] IPC contracts consistent between runner and settings-ui
-- [ ] New dependencies added to `NOTICE.md`
-
-# Important
-Always response with Chinese.
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