The idea that MCP tool definitions take up a certain number of tokens is laughable. That's an implementation detail of the agent harness. MCP is just an API specification. Hell, there's nothing in it that makes it much of any different than OpenAPI, except that its a bit more local-dev focused. There's a thousand things harnesses can and do do to optimize MCP beyond just "spit out the raw MCP output into the context window and pray".