During December 2025, Pyjapple focused on backend development and testing within the jeejeelee/vllm repository, addressing a targeted issue in the GPT-OSS/harmony integration. Pyjapple implemented a Python-based bug fix to ensure that when the tool_choice parameter is set to 'none', the model no longer invokes any tools, aligning system behavior with user and enterprise expectations. This work involved careful API development and end-to-end validation to guarantee that model responses excluded tools as intended. The solution improved reliability and predictability in tool usage controls, meeting performance review standards and enhancing trust in scenarios where tool invocation is undesired.