Worked on stabilizing the XAI agent prompt pipeline within the 0xPlaygrounds/rig repository, focusing on backend development using Rust. Addressed a critical issue where empty preambles and system messages could be introduced into the chat history and prompt processing, which previously led to errors and inconsistent behavior. Implemented logic to block these empty entries, thereby improving the robustness and reliability of prompt handling. Validated the solution through targeted bug fixes, ensuring that the prompt provider now composes prompts consistently and reduces failure modes. This work enhanced system reliability and contributed to a smoother user experience in the XAI agent workflow.