MCP Strategies on AWS, Part 1: Reading the Whole Guide

Mon, 15 Jun 2026 00:00:00 +0000

TL;DR: AWS published a Prescriptive Guidance paper, “Model Context Protocol strategies on AWS,” that organizes MCP into three pillars: tool design, hosting, and governance. The most useful parts are concrete: keep tools to eight parameters or fewer, bundle any workflow that needs three or more calls into one tool, split a server past fifty tools, and remember each tool definition costs 250 to 500 tokens on every single model call. The paper is a guide-tier document (it tells you how to think, not which buttons to click), so this is the start of a four-part series where I turn each pillar into runnable code. This first post covers what the guidance contains, why it matters, and how it lines up with the security concerns the wider MCP community has been raising. The headline accuracy numbers come from external research, not an AWS benchmark, so I treat them as cited research rather than a guarantee.

A customer asked me last month why their internal agent kept picking the wrong tool. They had wired up forty-odd MCP tools to a single agent and assumed more capability meant more usefulness. The opposite happened. The model spent its context budget reading tool descriptions and still guessed. That conversation is the reason I read the new AWS guidance the day it landed, and the reason I am writing this series.

schristoph.online

MCP Strategies on AWS, Part 1: Reading the Whole Guide