The PalmClaw framework, open-sourced by ModalityDance (GitHub 1.1k stars), was submitted to arXiv (2607.13027) on July 14. It abstracts phone sensors, app data, and device capabilities as device tools with explicit inputs and boundaries, freeing on-device LLM Agents from long chains of GUI clicks. Against the strongest baseline, it achieves an 11.5% task-success-rate improvement and 94.9% completion-time compression, providing a reproducible open-source chassis for on-device Agent engineering.