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+# CLAUDE.md — Everywhere Codebase Guide
+
+## Project Overview
+
+Everywhere is a cross-platform AI assistant desktop application written in C# targeting .NET 10. It integrates multiple LLM providers (Claude, OpenAI, Google Gemini, local Ollama), supports the Model Context Protocol (MCP), provides deep OS-level integration (terminal, screen capture, accessibility), and features a plugin/strategy engine for automated task execution. The UI is built with Avalonia (XAML-based, cross-platform).
+
+Current version: **v0.7.8** (see `CHANGELOG.md`)
+
+---
+
+## Repository Layout
+
+```
+/
+├── src/                            # All production source code (9 projects)
+│   ├── Everywhere.Abstractions/    # Interfaces and core contracts (no dependencies on Core)
+│   ├── Everywhere.Core/            # Main application logic, UI, AI, plugins, chat
+│   ├── Everywhere.Cloud/           # Everywhere Cloud API integration
+│   ├── Everywhere.Windows/         # Windows entry point (Program.cs)
+│   ├── Everywhere.Mac/             # macOS entry point (Program.cs)
+│   ├── Everywhere.Linux/           # Linux entry point (Program.cs, early dev)
+│   ├── Everywhere.Watchdog/        # Background watchdog service
+│   ├── Everywhere.I18N/            # Localization resources
+│   ├── Everywhere.I18N.SourceGenerator/         # Roslyn source generator for i18n
+│   └── Everywhere.Configuration.SourceGenerator/ # Roslyn source generator for settings
+├── tests/
+│   ├── Everywhere.Abstractions.Tests/  # NUnit tests for abstractions
+│   ├── Everywhere.Core.Tests/          # NUnit tests for core
+│   └── Everywhere.Terminal.TestApp/    # Manual test app for terminal features
+├── 3rd/                            # Vendored/patched third-party libraries
+│   ├── EverythingNetCore/          # Windows Everything file search integration
+│   ├── MessagePack-CSharp/         # MessagePack with source generator
+│   ├── Porta.Pty/                  # Cross-platform PTY implementation
+│   ├── WritableJsonConfiguration/  # JSON config with file watching
+│   ├── semantic-kernel/            # Semantic Kernel fork
+│   ├── semantic-kernel-patch/      # Custom Google Gemini connector for SK
+│   └── shad-ui/                    # Custom Avalonia UI component library
+├── patches/                        # Patch files applied during build
+├── docs/                           # Developer documentation
+│   ├── build.md                    # Build prerequisites and instructions
+│   ├── patches.md                  # Documentation on applied patches
+│   ├── StrategyEngine/             # Strategy engine architecture docs
+│   └── Terminal/                   # Terminal integration docs
+├── tools/                          # Build scripts and utilities
+├── img/                            # Application icons and images
+├── .github/workflows/              # CI/CD pipelines
+├── Everywhere.slnx                 # Main solution (all platforms)
+├── Everywhere.Windows.slnx         # Windows-only solution filter
+├── Everywhere.Mac.slnx             # macOS-only solution filter
+├── Everywhere.Linux.slnx           # Linux-only solution filter
+├── Directory.Build.props           # Global MSBuild properties (applied to all projects)
+├── Directory.Packages.props        # Centralized NuGet version management (CPM)
+├── global.json                     # .NET SDK version pin (10.0.202)
+└── nuget.config                    # NuGet package sources
+```
+
+### Key directories inside `src/Everywhere.Core/`
+
+```
+Everywhere.Core/
+├── AI/                  # LLM kernel mixins (Claude, OpenAI, Ollama, Google)
+├── Chat/                # Chat context, history, service, plugins, permissions
+│   ├── Plugins/         # Chat plugin system (built-in tools + MCP)
+│   ├── Permissions/     # Tool-use permission/approval system
+│   └── VisualContext/   # Screen capture and visual element analysis
+├── Configuration/       # Settings, API keys, persistent configuration
+├── Database/            # EF Core SQLite context, migrations, interceptors
+├── Initialization/      # App startup and DI composition (Entrance.cs)
+├── StrategyEngine/      # Automated workflow execution engine
+├── Terminal/            # PTY-based terminal integration
+├── ViewModels/          # MVVM ViewModels (CommunityToolkit.Mvvm)
+├── Views/               # Avalonia XAML views (.axaml + .axaml.cs)
+├── Web/                 # Web search and page content extraction
+├── Interop/             # Platform interop helpers
+└── Extensions/          # Extension methods and utilities
+```
+
+---
+
+## Technology Stack
+
+| Category | Technology |
+|---|---|
+| Language | C# 12+ (LangVersion: preview) |
+| Runtime | .NET 10.0 |
+| UI Framework | Avalonia 11.x (cross-platform XAML) |
+| Text Editor | AvaloniaEdit |
+| Markdown Rendering | LiveMarkdown.Avalonia |
+| UI Components | ShadUI (vendored in `3rd/shad-ui`) |
+| LLM Orchestration | Microsoft.SemanticKernel 1.75.x |
+| LLM Abstractions | Microsoft.Extensions.AI 10.5.x |
+| Claude Integration | Anthropic SDK 12.x |
+| OpenAI Integration | Microsoft.Extensions.AI.OpenAI |
+| Local LLM | OllamaSharp |
+| MCP Protocol | ModelContextProtocol 1.2.x |
+| Data Persistence | Entity Framework Core 10 + SQLite |
+| Configuration | WritableJsonConfiguration (vendored) |
+| Terminal | Porta.Pty (vendored, cross-platform PTY) |
+| Web Automation | PuppeteerSharp |
+| Secrets | GnomeStack.Os.Secrets (OS credential manager) |
+| Logging | Serilog |
+| Error Tracking | Sentry |
+| MVVM | CommunityToolkit.Mvvm |
+| Reactive Collections | DynamicData |
+| Testing | NUnit 4 + NSubstitute + coverlet |
+
+---
+
+## Build Prerequisites
+
+- **Git** with LFS and submodule support
+- **.NET SDK 10.0.202** (pinned in `global.json`)
+- **Windows 10 19041+** / **macOS 12+** / **Linux with X11**
+- **JetBrains Rider 2026.1 Nightly+** (recommended IDE; required for `.axaml` IntelliSense)
+- **Xcode Command Line Tools** (macOS only)
+- **Inno Setup** (Windows installer builds only, handled in CI)
+
+---
+
+## Development Workflows
+
+### Initial Setup
+
+```bash
+# Clone with submodules and LFS
+git clone https://github.com/Sylinko/Everywhere.git --recursive
+
+# If already cloned without submodules
+git submodule update --init --recursive
+git lfs pull
+
+# Windows only: enable long paths (run as admin)
+git config --global core.longpaths true
+
+# macOS only: install Xcode CLI tools
+xcode-select --install
+```
+
+### Restore and Build
+
+```bash
+# Restore .NET workloads (Avalonia needs specific workloads)
+dotnet workload restore Everywhere.slnx
+
+# Restore NuGet packages (includes vendored local packages)
+dotnet restore Everywhere.slnx
+
+# Build a specific platform
+dotnet build src/Everywhere.Windows/Everywhere.Windows.csproj -c Debug
+dotnet build src/Everywhere.Mac/Everywhere.Mac.csproj -c Debug
+dotnet build src/Everywhere.Linux/Everywhere.Linux.csproj -c Debug
+```
+
+### Run
+
+```bash
+dotnet run --project src/Everywhere.Windows/Everywhere.Windows.csproj -c Debug
+```
+
+Windows output: `src/Everywhere.Windows/bin/Debug/net10.0-windows10.0.19041.0/win-x64/Everywhere.exe`
+
+Using Rider is strongly preferred — it sets the correct working directory and environment automatically.
+
+### Kill Stale Build Servers
+
+If build fails due to locked files:
+
+```bash
+dotnet build-server shutdown
+```
+
+### Run Tests
+
+```bash
+dotnet test
+dotnet test --collect:"XPlat Code Coverage"
+```
+
+Tests live under `tests/`. The `Everywhere.Terminal.TestApp` is a manual test harness, not automated.
+
+---
+
+## Solution Files
+
+| File | Purpose |
+|---|---|
+| `Everywhere.slnx` | Full solution — all platforms |
+| `Everywhere.Windows.slnx` | Windows builds only |
+| `Everywhere.Mac.slnx` | macOS builds only |
+| `Everywhere.Linux.slnx` | Linux builds only |
+
+Use platform-specific `.slnx` files for CI. Use `Everywhere.slnx` in your IDE.
+
+---
+
+## Code Conventions
+
+### Nullability
+
+Nullable reference types are **enabled** everywhere (`<Nullable>enable</Nullable>`). Nullable warnings are treated as **errors** (`<WarningsAsErrors>nullable</WarningsAsErrors>`). Never suppress nullability warnings without a clear justification.
+
+### Language Version
+
+C# preview features are enabled (`<LangVersion>preview</LangVersion>`). Use modern C# idioms freely.
+
+### Unsafe Code
+
+`<AllowUnsafeBlocks>true</AllowUnsafeBlocks>` is set globally. Unsafe code is used in PTY and platform interop. Keep it isolated and well-commented.
+
+### Implicit Usings
+
+`<ImplicitUsings>enable</ImplicitUsings>` is set. `NUnit.Framework` is globally included in test projects.
+
+### Conditional Compilation
+
+Platform-specific code uses preprocessor constants defined in `Directory.Build.props`:
+
+| Constant | When active |
+|---|---|
+| `WINDOWS` / `IsWindows` | Building on Windows |
+| `LINUX` / `IsLinux` | Building on Linux |
+| `OSX` / `MACOS` / `IsOSX` / `IsMacOS` | Building on macOS |
+| `UNIX` / `IsUnix` | Linux or macOS |
+| `DESKTOP` / `IsDesktop` | Any desktop platform |
+| `X64` / `ARM64` / `X86` / `ARM` | Architecture-specific |
+
+Use `#if WINDOWS` style guards for platform-specific code paths.
+
+### MVVM Pattern
+
+- ViewModels use `CommunityToolkit.Mvvm` source generators (`[ObservableProperty]`, `[RelayCommand]`, etc.).
+- Views are Avalonia `.axaml` files with code-behind `.axaml.cs`.
+- Bindings use compiled bindings by default (`<AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>`).
+- Reactive collections use `DynamicData`.
+
+### Dependency Injection
+
+- `Microsoft.Extensions.DependencyInjection` is the DI container.
+- Services are registered in platform entry points and `Entrance.cs` (`src/Everywhere.Core/Initialization/`).
+- Use constructor injection; avoid `ServiceLocator` except at composition roots.
+
+### Naming
+
+- Follow standard C# conventions (PascalCase types, camelCase locals, `_camelCase` private fields).
+- Interfaces are prefixed with `I` (e.g., `IChatService`).
+- Source-generated configuration classes use `SettingsAttributes` conventions.
+
+### Avalonia XAML
+
+- UI files use the `.axaml` extension (not `.xaml`).
+- Older versions of Rider may show errors in `.axaml` files — use Rider 2026.1 Nightly+.
+- Resources and assets are declared in `Everywhere.Core.csproj` as `<AvaloniaResource>`.
+
+---
+
+## Package Management
+
+Package versions are centralized in `Directory.Packages.props` (Central Package Management). **Do not specify versions in individual `.csproj` files** — add/update versions only in `Directory.Packages.props`.
+
+---
+
+## Vendored Dependencies (`3rd/`)
+
+These are Git submodules with custom patches applied at build time via `src/Build.Patches.targets`.
+
+- `Porta.Pty` — cross-platform PTY; local NuGet output goes to `3rd/Porta.Pty/nuget/`
+- `shad-ui` — Avalonia UI component library (ShadUI)
+- `semantic-kernel-patch` — adds Google Gemini connector to Semantic Kernel
+- `WritableJsonConfiguration` — JSON config with live reload
+- `MessagePack-CSharp` — used as a source generator analyzer only
+- `EverythingNetCore` — Windows-only Everything file search integration
+
+When modifying vendored code, understand which patch file (in `patches/`) governs it and update accordingly. See `docs/patches.md`.
+
+---
+
+## Internationalization (I18N)
+
+- Localization strings live in `src/Everywhere.Core/I18N/*.resx` files.
+- These are consumed by the `Everywhere.I18N.SourceGenerator` Roslyn analyzer to generate type-safe accessors.
+- The `sync-i18n.yml` CI workflow syncs translations.
+- Add new strings to the base `.resx` file; the source generator handles the rest.
+
+---
+
+## Configuration System
+
+- Settings are persisted as JSON via `WritableJsonConfiguration`.
+- Settings classes use `SettingsAttributes` (from `Everywhere.Configuration.SourceGenerator`) for source-generated boilerplate.
+- API keys are stored in the OS credential manager via `GnomeStack.Os.Secrets`.
+- Settings migrations are supported — add a migration class when changing the schema.
+- Configuration categories live in `src/Everywhere.Core/Configuration/`.
+
+---
+
+## Database
+
+- SQLite database managed by Entity Framework Core 10.
+- `DbContext` is in `src/Everywhere.Core/Database/`.
+- Add migrations with `dotnet ef migrations add <Name> --project src/Everywhere.Core`.
+- The database stores chat history and related metadata.
+
+---
+
+## AI Integration
+
+- `src/Everywhere.Core/AI/` contains per-provider "kernel mixin" classes that extend `IKernelBuilder`.
+- The abstraction layer is `Microsoft.Extensions.AI` (`IChatClient`).
+- Semantic Kernel (`IKernel`) orchestrates multi-step tool use.
+- MCP servers are integrated via the `ModelContextProtocol` package.
+- Token counting uses `Microsoft.ML.Tokenizers` (O200k base for GPT-family).
+- For Claude specifically, the `Anthropic` SDK is used directly in some paths.
+
+---
+
+## Plugin System
+
+- Chat plugins live in `src/Everywhere.Core/Chat/Plugins/`.
+- Plugins are SK functions exposed to the LLM via tool calling.
+- A `ChatPluginManager` manages registration and lifecycle.
+- User-facing permission prompts are handled via `src/Everywhere.Core/Chat/Permissions/`.
+- MCP servers can be connected as external plugin sources.
+
+---
+
+## Strategy Engine
+
+- Location: `src/Everywhere.Core/StrategyEngine/`
+- Automates multi-step workflows without continuous user interaction.
+- Architecture documented in `docs/StrategyEngine/`.
+
+---
+
+## Terminal Integration
+
+- PTY-based via `Porta.Pty` (cross-platform).
+- Shell integration scripts: `src/Everywhere.Core/Assets/Terminal/shellIntegration.{ps1,zsh,bash}`.
+- Architecture documented in `docs/Terminal/`.
+- Windows ConPTY requires `conpty.dll` copied to the output directory (handled by a build target in the test project).
+
+---
+
+## CI/CD Pipelines
+
+| Workflow | Trigger | Purpose |
+|---|---|---|
+| `windows-release.yml` | Tag `v*.*.*` or manual | Build Windows MSI installer |
+| `macos-release.yml` | Tag `v*.*.*` or manual | Build macOS DMG/app bundle |
+| `linux-release.yml` | Tag `v*.*.*` or manual | Build Linux AppImage |
+| `aur-publish.yml` | Release | Publish to AUR (Arch Linux) |
+| `sync-i18n.yml` | Push | Sync translation files |
+| `close-stale-issues.yml` | Schedule | Automated issue hygiene |
+
+Releases are triggered by pushing a `v*.*.*` tag. Workflows can also be triggered manually (`workflow_dispatch`) — they validate that the current commit is tagged before proceeding.
+
+---
+
+## Key Files Quick Reference
+
+| File | Purpose |
+|---|---|
+| `global.json` | SDK version pin |
+| `Directory.Build.props` | Global MSBuild properties, platform constants |
+| `Directory.Packages.props` | Centralized NuGet version management |
+| `src/Everywhere.Core/Initialization/Entrance.cs` | App startup and DI registration |
+| `src/Everywhere.Core/App.axaml.cs` | Avalonia Application class |
+| `src/Everywhere.Core/Global.cs` | Global constants and helpers |
+| `src/Everywhere.Windows/Program.cs` | Windows entry point |
+| `src/Everywhere.Mac/Program.cs` | macOS entry point |
+| `src/Everywhere.Linux/Program.cs` | Linux entry point |
+| `src/Everywhere.Core/Chat/ChatService.cs` | Core chat orchestration |
+| `src/Everywhere.Core/Configuration/` | App settings and API key storage |
+| `src/Everywhere.Core/Database/` | EF Core DbContext and migrations |
+| `docs/build.md` | Full build instructions |
+| `CHANGELOG.md` | Version history and release notes |