According to Server::$supportedProtocolVersion protocol version 2025-06-18 is supported.

However some of the server features described in that spec are missing:

• ResourceTemplates (see [Add] Resource Template Implementation #80 & Add resource template support #82)
• Completion
• Logging
• Pagination (See comment by alankpax)

as well as all of the client features:

• Roots
• Sampling
• Elicitation

In order for this package to continue being useful, we should consider implementing all those features not only for the sake of being compliant with the spec because those features yield actual real-world benefits that developers are going to want to have.