How to secure MCP tools on AWS for AI agents with authentication, authorization, and least privilege

Model Context Protocol (or MCP) makes it easier for AI agents to access your existing backend capabilities. It allows AI agents to have access to your system's call services and to use tools such as Lambda functions. That convenience comes with a huge trade-off, a raised bar for security, because it demands a much stronger access model around those interactions. The problem is that once an agent can reach tools, you should be questioning who is calling what, on whose behalf, with which scope, th