Worked on the awslabs/mcp repository to enhance reliability in CloudWatch MCP by addressing a validation issue in the LogGroupMetadata data model. Modified the backend Python code to make the storedBytes field optional, ensuring compatibility with the AWS DescribeLogGroups API when storedBytes is omitted. This change prevented Pydantic validation errors and stabilized describe_log_groups responses for downstream tools. Developed targeted unit tests to verify correct behavior with both present and missing storedBytes values, and maintained code quality by aligning with Ruff linting standards. Demonstrated skills in API integration, backend development, and testing while focusing on maintainability and robust data handling.