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EC2 + IAM + STS via AWS Query protocol (Signature V4), 9 commands: describe instances/security-groups, authorize/revoke security-group ingress, modify instance security groups (isolate), stop instances, list/update IAM access keys (deactivate compromised key), STS caller identity. Stdlib-only. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>