During December 2024, Suzuki Shunsuke focused on improving the reliability of Terraform automation in the suzuki-shunsuke/tfaction repository. He addressed a persistent issue with Terraform plan output handling by ensuring the tfplan.binary file is always written to an explicit path in the current working directory, rather than relying on relative paths that could fail across CI/CD runners and local scripts. This DevOps-oriented fix, implemented using Shell scripting and Terraform, reduced environmental inconsistencies and made automated plan generation more predictable. Suzuki validated the solution through targeted testing and code review, demonstrating careful attention to cross-environment compatibility and operational stability.