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> I somewhat agree with author’s comments, but also want to note that the protocol is in the extremely early stages of development, and it will likely evolve a lot over the next year.

And that's why it's so important to spec with humility. When you make mistakes early in protocol design, you live with them FOREVER. Do you really want to live with a SSE Rube Goldberg machine forever? Who the hell does? Do you think you can YOLO a breaking change to the protocol? That might work in NPM but enterprise customers will scream like banshees if you do, so in practice, you're stuck with your mistakes.

discuss

jes5199|9 months ago

they already did though. the late-2024 version and the early-2025 version have completely incompatible SSE rube goldberg machines

punkpeye|9 months ago

Just focusing on worst-case scenarios tends to spread more FUD than move things forward. If you have specific proposals for how the protocol could be designed differently, I’m sure the community would love to hear them – https://github.com/orgs/modelcontextprotocol/discussions

ethical_source|9 months ago

The worst case scenario being, what, someone implementing the spec instead of using the SDK and doing it in a way you didn't anticipate? Security and interoperability will not yield to concerns about generating FUD. These concerns are important whether you like them or not. You might as well be whispering that ill news is a ill guest.

At the least, MCP needs to clarify things like "SHOULD rate limit" in more precise terms. Imagine someone who is NOT YOU, someone who doesn't go to your offsites, someone who doesn't give a fuck about your CoC, implementing your spec TO THE LETTER in a way you didn't anticipate. You going to sit there and complain that you obviously didn't intend to do the things that weird but compliant server is doing? You don't have a recourse.

The recent MCP annotations work is especially garbage. What the fuck is "read only"? What's "destructive"? With respect to what? And hoo boy, "open world". What the fuck? You expect people to read your mind?

What would be the point of creating GH issues to discuss these problems? The kind of mind that writes things like this isn't the kind of mind that will understand why they need fixing.