Tony Kay developed dynamic Arista EOS version handling for AMI build automation in the ansible/workshops repository, focusing on cloud automation and infrastructure as code. He introduced the arista_eos_version variable and updated the ec2_info filter, enabling EC2 launches to select the appropriate EOS version automatically. This approach, implemented using YAML, aligned AMI creation with current EOS releases and reduced manual intervention. By ensuring the correct EOS version was applied during AMI builds, Tony improved reliability and accelerated multi-region deployment pipelines. His work demonstrated careful version control and traceability, addressing version-mismatch issues and enhancing the maintainability of the automation workflow.