During April 2026, Sebastian Roecker focused on backend development and API integration for the NousResearch/hermes-agent repository. He addressed a stability issue affecting Open WebUI tool interactions by updating the API server’s tool_progress callback signature, ensuring correct processing and display of tool start events within the chat stream. This Python-based fix resolved argument-positioning errors in streaming, enabling real-time visualization of tool usage and improving the user experience for tool-assisted workflows. The work was delivered as a focused, low-risk change, validated end-to-end, and maintained code quality by minimizing the surface area and regression risk associated with the update.