Token overhead in coding agents: the task used 0.67% but overhead used the rest

What I do to keep MCP context usage under control is:

1) Enable every MCP server you want

2) Disallow tool usage on your main agent

3) Create sub-agents that are designated to just use that MCP toolset by overriding the disallow with an allow of the MCP tool list. I have one for gitlab (which has over a hundred tools), one for sound generation, one for image generation, etc.