Worked on the anthropics/claude-agent-sdk-python repository, focusing on backend development using Python. Delivered a targeted code cleanup by removing the unused mcp_tools field from the ClaudeCodeOptions class, which improved code clarity and reduced future maintenance overhead. This change streamlined the codebase, making it easier for other developers to understand and extend the relevant components. All modifications were validated against existing tests, ensuring stability and minimal risk to ongoing development. No major bugs were reported or fixed during this period, reflecting a stable code environment. The work demonstrated attention to maintainability and effective use of Python for backend engineering tasks.