We literally just did something like this on Gram, not exactly what you're saying, but it's pretty close... https://www.speakeasy.com/blog/how-we-reduced-token-usage-by...

We have a platform (Gram) which is serverless MCP. Now users can launch MCP servers that only have 3 tools, search, describe, execute. Gram handles the tool routing, and execution (acting sort of like the sandbox). So the client only ever needs to know about those three tools. Everything else is abstracted.