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+# AI Agent Guidelines
+
+This repository contains development environment configuration scripts (dotfiles/setup scripts) intended to automate the installation and configuration of developer tools (Zsh, Node.js, Python, Rust, Go, Vim, VSCode) across different machines.
+
+When assisting with this repository, please adhere to the following guidelines:
+
+## 1. Cross-Platform Compatibility
+- The scripts (like `setup.sh` and `zsh.sh`) should primarily support macOS (Darwin) and Linux (especially Debian/Ubuntu-based distributions).
+- Always use conditional checks (e.g., `if [[ "$OSTYPE" == "darwin"* ]]`) when performing OS-specific operations, such as installing packages via `brew` vs `apt`.
+
+## 2. Proxy and Mirrors (`$USE_PROXY`)
+- This repository supports an optional domestic proxy/mirror feature for users in mainland China.
+- When adding support for a new programming language, package manager, or tool, always check if `$USE_PROXY` is enabled.
+- If `$USE_PROXY` is set, configure the tool to use a reliable Chinese mirror source (e.g., Aliyun, rsproxy, goproxy.cn, npmmirror) to speed up downloads.
+
+## 3. Shell Script Best Practices
+- **Strict Mode**: Ensure bash/zsh scripts start with `set -euo pipefail` to catch errors early.
+- **Idempotency**: Scripts should be safe to run multiple times. Check if a tool or directory already exists before downloading or installing (e.g., `if ! command -v tool &> /dev/null; then ...`).
+- **Formatting**: Shell scripts should ideally be formatted. Avoid trailing spaces and use consistent indentation (4 spaces or 2 spaces depending on the existing code, default here is 4 spaces).
+- Ensure safe file handling. When creating symbolic links, use `ln -snf` to overwrite existing links safely without creating recursive loops.
+
+## 4. Modifying Tool Configurations
+- **Zsh**: Global environment variables should be injected into `~/.zshenv`, while interactive configurations go into `~/.zshrc`.
+- **VSCode**: Settings are located in `editors/vscode/settings.json`. Make sure to handle all platform paths (macOS, Linux, VSCodium, VSCode Insiders).
+- **Vim**: Vim configurations are based on `amix/vimrc`. Customizations go to `config/my_configs.vim`.
+- **Git**: Ensure the global `.gitignore` is correctly linked to the repo's `.gitignore`.
+
+## 5. Adding New Tools
+- Try to use lightweight, fast version/package managers when possible (e.g., `fnm` for Node, `uv` for Python).
+- Do not add heavy dependencies unless strictly necessary.
+
+## 6. Testing
+- If possible, verify script behavior locally without permanently disrupting the user's environment, or prompt the user for confirmation.