# Reference / 参考手册

## Environment Variables / 环境变量

| Variable | Purpose / 用途 |
|---------|---------|
| `DWS_CONFIG_DIR` | Override default config directory / 覆盖默认配置目录 |
| `DWS_SERVERS_URL` | Point discovery at a custom server registry endpoint / 将服务发现指向自定义端点 |
| `DWS_CLIENT_ID` | OAuth client ID (DingTalk AppKey) |
| `DWS_CLIENT_SECRET` | OAuth client secret (DingTalk AppSecret) |
| `DWS_TRUSTED_DOMAINS` | Comma-separated trusted domains for bearer token (default: `*.dingtalk.com`). `*` for dev only / Bearer token 允许发送的域名白名单，默认 `*.dingtalk.com`，仅开发环境可设为 `*` |
| `DWS_ALLOW_HTTP_ENDPOINTS` | Set `1` to allow HTTP for loopback during dev / 设为 `1` 允许回环地址 HTTP，仅用于开发调试 |

## Exit Codes / 退出码

| Code | Category | Description / 描述 |
|------|----------|-------------|
| 0 | Success | Command completed successfully / 命令执行成功 |
| 1 | API | MCP tool call or upstream API failure / MCP 工具调用或上游 API 失败 |
| 2 | Auth | Authentication or authorization failure / 身份认证或授权失败 |
| 3 | Validation | Invalid input, flags, or parameter schema mismatch / 输入参数校验失败 |
| 4 | Discovery | Server discovery, cache, or protocol negotiation failure / 服务发现失败 |
| 5 | Internal | Unexpected internal error / 未预期的内部错误 |

With `-f json`, error responses include structured payloads: `category`, `reason`, `hint`, `actions`.

使用 `-f json` 时，错误响应包含结构化字段：`category`、`reason`、`hint`、`actions`。

## Output Formats / 输出格式

```bash
dws contact user search --keyword "Alice" -f table   # Table (default, human-friendly / 表格，默认)
dws contact user search --keyword "Alice" -f json    # JSON (for agents and piping / 适合 agent)
dws contact user search --keyword "Alice" -f raw     # Raw API response / 原始响应
```

## Dry Run / 试运行

```bash
dws todo task list --dry-run    # Preview MCP call without executing / 预览但不执行
```

## Output to File / 输出到文件

```bash
dws contact user search --keyword "Alice" -o result.json
```

## Shell Completion / 自动补全

```bash
# Bash
dws completion bash > /etc/bash_completion.d/dws

# Zsh
dws completion zsh > "${fpath[1]}/_dws"

# Fish
dws completion fish > ~/.config/fish/completions/dws.fish
```