Hey I am the one Lead maintainer of the MCP protocol.

I agree and hear you that file uploads are a pain. As the core maintainer group we have deferred the work on this for this release and hope to pick it up soon.

Now is the moment to engage with the respective working group to make your case heard so we can ensure it’s on the roadmap.

I concur. Most of my MCP pain is dealing with client's differing ability to handle images. Some clients (old codex) would even truncate the base64 data regardless of how it was json-wrapped. And sometimes they just ingest the base64 date directly into their context window. Not sure if this is an MCP thing or a clients-poorly-implementing-MCP thing.