请提供一些参考 MCP 服务器的示例，这些服务器演示了当前模型上下文协议规范中的身份验证机制。
Context7 MCP 服务器——关于大型语言模型 (LLM) 和 AI 代码编辑器的最新文档
The authentication glue you need.
Self-Hosting Guide. Learn all about locally hosting (on premises & private web servers) and managing software applications by yourself or your organization. Including Cloud, LLMs, WireGuard, Automation, Home Assistant, and Networking.
Open Policy Agent (OPA) is an open source, general-purpose policy engine.
Playwright MCP 服务器
The Open Source Firebase Alternative with GraphQL.
The most reliable AI agent framework that supports MCP.
? 史上最强云手机远程桌面逆向抓包HOOK自动化取证能力集一体的安卓 RPA 框架，下一代移动数据自动化机器人。
a coding agent with semantic retrieval & editing capabilities (MCP server)
Firebase SDK for Apple App Development
