I guess it depends on the implementations.
When I use the Atlassian CLI vs their MCP server, I tend to see something like half the token burn with the CLI with more accurate results.
That could be an Atlassian issue but that's the results I'm seeing.
yeah MCP contains a provision for some blocktext for instructions. If your MCP has walls of text in those instructions, it will burn more tokens that a terse MCP.