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But the spec is on the transport level. So for the specification, the transport layer is very important.

This is the spec that counts: https://github.com/modelcontextprotocol/modelcontextprotocol...

How exactly those messages get transported is not really relevant for implementing an mcp server, and easy to switch, as long as there is some standard.

You’re ignoring the power of network effects - “shitty but widely adopted” makes “better but just starting adoption harder” to grow. Think about how long it takes to create a new HTTP standard - we’ve had 3 HTTP standards in the past 30 years, the first 19 of which so no major changes. HTTP/2 kind of saw no adoption in practice and HTTP/3 is still a mixed bag. In fact, most of the servers pretend HTTP/1 with layers in front converting the protocols.

Underestimate network effects and ossification at your own peril.

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