The MCP Tax Is Real, and It Is Quietly Killing Your Agent's Reasoning
Every time your AI agent makes a tool call through MCP, it pays a tax. Not in dollars (though that too), but in tokens. Tens of thousands of them. Silently injected. Every single turn.
A new paper dropped yesterday that puts hard numbers on this prob...
theagentstack.hashnode.dev8 min read
The Data Nerd
mcp, ai, typescript, developer-tools, open-source
Confirming this from production. We ship a 5-tool MCP server (financial-signals domain) — kept it deliberately tight after watching Claude pick the wrong tool when we tested 8. The real tax wasn't the tokens; it was descriptions getting parsed every turn into context-relevant slots that didn't exist. Curious whether you've measured the curve at 3 vs 5 vs 10 tools, or whether the inflection point is mostly description quality + naming overlap.