Worked on the langchain4j repository to deliver a robust fix for PartsMapper Tool Response Parsing, addressing failures caused by escaped quotes and diverse JSON formats. Refactored the parsing logic by introducing a dedicated helper to attempt multiple strategies, ensuring tool responses could be reliably converted to Struct. Expanded both unit and integration test coverage, with all tests passing across core and main modules. Maintained API compatibility throughout, reducing reliability risks in automated workflows such as Gemini integration. Utilized Java for implementation, focusing on API development and comprehensive unit testing to enhance the stability and automation confidence of tool-based processes.