The Agent Toolkit for AWS gives your coding agent access to the AWS MCP and curated skills, but without updating the rules file, your agent might answer from model training data instead of using its new tools. Last updated: May 13, 2026 If you're like me, sometimes you get so excited to try something new that you don't read all the way through the docs before you start using it. Last week, the Agent Toolkit for AWS had just been released, I had the README open, and two minutes later I was asking my agent to design a serverless backend in my Kiro IDE. But the agent didn't touch any of the tools I had just configured. It answered from training data and gave me a reasonable API Gateway + Lambda + DynamoDB architecture, but never reached for the MCP documentation search or the aws-core skills I had installed. I had to prompt it to use the MCP server and skills before it gave them a go.…