FDKEY — AI-agent verification SDK for MCP servers.
This is a name-reservation placeholder. The real `fdkey` Rust SDK lands
shortly — it will provide a `with_fdkey()` middleware that gates any
[MCP](https://modelcontextprotocol.io) server behind an LLM-only
verification challenge, mirroring the TypeScript SDK at
[`@fdkey/mcp`](https://www.npmjs.com/package/@fdkey/mcp) and the Python
SDK at [`fdkey`](https://pypi.org/project/fdkey/).
See [https://fdkey.com](https://fdkey.com).