It sounds like a House of Cards. Is it?

说明与用途

许多 MCP 服务器和 A2A 代理缺乏或错误实现其数字名片，导致发现不可靠。作者对 50 台服务器进行采样，发现仅有一台符合规范，识别缺失的头信息，修复后验证符合 SEP‑2127 规范。

问题

Many MCP servers and A2A agents lack or misimplement their digital business cards (Server Cards/Agent Cards), leading to unreliable discovery and connection.

结果

The author demonstrated that a small sample of MCP servers largely lacked compliant Server Cards, identified specific header failures, corrected them, and verified compliance, illustrating the importance of checking and maintaining card validity.

工作流

• Sample MCP Registry for public servers
• Request each server’s card at the spec‑reserved URL
• Validate card against SEP‑2127 required headers
• Identify missing headers
• Fix server configuration to include required headers
• Redeploy server
• Re‑validate card to ensure compliance

证据

I took a sample of the official MCP Registry: about 50 servers with a public address. I asked each one for its card at the address the spec reserves for it.

来源

One had one. And it was a good one: small and tidy, listed in the site's own AI Catalog, with an AGENTS.md for agents to read.

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It failed two of the spec's required checks. Two headers a browser needs, to read the card and to ask politely whether it had changed, were both missing.

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I fixed them and redeployed the same day. Checked again: no required failures.

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