PhoneHarness: Harnessing Phone-Use Agents through Mixed GUI, CLI, and Tool Actions

In three linesPhoneHarness is a benchmark and execution harness for evaluating phone agents on real mobile workflows. It combines GUI, CLI, and structured tool actions with auditable execution traces. The benchmark achieves 75.0% pass rate, outperforming non-PhoneHarness settings by 12.9 percentage points. Focus is on verifiable side effects, not screen predictions alone.

Summary generated by Claude — human-verified