Istiaq Rafi focused on enhancing test reliability and CI efficiency for the modelcontextprotocol/python-sdk repository by improving backend test utilities using Python. He implemented an HTTP readiness check within the wait_for_server function, ensuring the server was fully operational before test execution began. This approach addressed flaky startup conditions and reduced unnecessary waiting, directly improving feedback cycles and test stability. Additionally, Istiaq removed obsolete code related to server startup in SSE tests, streamlining the codebase and simplifying ongoing maintenance. His work demonstrated proficiency in Python, backend development, and testing, delivering practical improvements to the SDK’s test infrastructure and overall development workflow.