Worked on stabilizing the Anthropic client streaming flow within the microsoft/agent-framework repository, focusing on backend reliability. Addressed a critical bug by ensuring that streaming updates consistently set the role to 'assistant' during message start events, which prevented tool-use blocks from being misclassified as user-role messages. This solution involved implementing targeted regression tests to validate the new behavior and documenting the previous issue for future reference. Utilized Python for backend development, API integration, and comprehensive unit testing. The work improved the consistency of streaming interactions and enhanced downstream tool integrations, contributing to better test coverage and overall system observability.