Setting up the Agent Toolkit for AWS in Kiro (and Codex, Claude Code, and Cursor)
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The Agent Toolkit for AWS is a free, AWS-supported collection of MCP-compatible tools that stops coding agents from guessing outdated API parameters by providing current documentation, vetted skills, and IAM-scoped access at request time. It includes an MCP server covering 300+ AWS services, 64 curated skills for tasks like least-privilege IAM and serverless stacks, and four plugins (aws-core, aws-agents, aws-data-analytics, aws-agents-for-devsecops) that bundle config and skills for Claude Code, Codex, and Cursor. Every API call runs through the user's IAM credentials, logs to CloudTrail, and stamps condition keys (aws:ViaAWSMCPService, aws:CalledViaAWSMCP) to distinguish agent traffic from human actions in policies.