During March 2026, Alex enhanced the awslabs/mcp repository by implementing flexible AWS credential and region handling for the HealthOmics MCP server. He introduced optional per-call aws_profile and aws_region parameters across all AWS API tools, enabling dynamic multi-account and multi-region workflows while preserving default behaviors when overrides are not specified. This work required deep integration with Python, AWS, and API development practices, including propagating parameters through utility modules, client factories, and orchestrators. Alex expanded test coverage with nine new tests, improved CI stability, and optimized code quality by introducing caching strategies and refining type handling, demonstrating thorough engineering depth.