Claude Code Router (CCR) is a cross-platform desktop application built with Electron and React that functions as a local gateway and router for AI agent traffic. It intercepts requests from local AI agents (Claude Code, Codex, ZCode) and routes them to various LLM providers (OpenAI, Anthropic, DeepSeek, etc.) through a configurable proxy. The application manages API keys, routing rules, fallback strategies, and provides detailed usage observability via a system tray and dashboard. It supports complex features like Fusion models (combining base models with tools), IM bot relay integrations (WeChat, Slack, etc.), and deep linking for provider provisioning. The architecture follows a standard Electron pattern with a Main process handling system-level tasks (proxy, SQLite storage, process management) and a Renderer process for the React UI. Data persistence relies on SQLite for configuration and usage logs. The codebase demonstrates significant engineering effort in handling cross-platform differences (macOS/Windows/Linux) for proxy installation, certificate management, and agent profile injection. While the code is well-structured with clear separation of concerns, it carries medium technical drift due to heavy reliance on native dependencies (better-sqlite3) and OS-specific commands for proxy and certificate management.