Worked on the pydantic-ai repository to enhance the robustness of MCPServer’s lifecycle management using Python. Focused on context managers and error handling, the developer introduced a safety mechanism in the MCPServer context manager’s exit flow to raise a ValueError if an exit is attempted without a corresponding entry or after an exit has already occurred. This change aimed to prevent resource leaks and silent misuse, improving reliability for downstream services. The update was validated with dedicated unit tests, ensuring correct error behavior and comprehensive coverage. The work demonstrated careful attention to lifecycle integrity and thorough testing practices throughout the process.