Worked on the modelcontextprotocol/python-sdk repository to enhance authentication reliability by developing robust Bearer Authentication Header Handling in the Python SDK. Focused on backend development and API security, the work involved implementing case-insensitive processing for both Authorization headers and the Bearer prefix, ensuring consistent token extraction across diverse client formats. Updated the header retrieval logic in Python to address edge cases and reduce authentication failures. Comprehensive tests were added to validate various header scenarios, strengthening the SDK’s security posture. This feature lays the foundation for future improvements in token workflows and improves authentication consistency across downstream services in the ecosystem.