Worked on the aws/amazon-ssm-agent repository to address a critical issue with IP address field handling, focusing on robust parsing and validation to prevent downstream errors in IP-related workflows. Applied expertise in Go to implement the fix, ensuring that the agent correctly processes and validates IP addresses. Updated release notes in Markdown to document the changes and refreshed project dependencies to maintain compatibility and stability. Reorganized and integrated tests to improve validation coverage and traceability, enhancing the reliability of future releases. The work resulted in fewer customer-facing incidents and clearer documentation, demonstrating a methodical approach to bug fixing and testing.