Roo Code

A fork-descendant of Cline that pushed multi-mode agent UX further: custom modes with per-mode permissions and prompts, letting one agent switch personas (architect, coder, reviewer) with different tool rights.

View source on GitHub

Key takeaways

• 01

  Per-mode permission sets: the reviewer persona cannot write files

• 02

  Custom modes are user-defined harness configurations

Flows built on this research

Harness Engineering

Design the Permission Approval UX

Design approval prompts users actually read: diffs, risk framing, scoped grants, and pacing that prevents approval fatigue.

4 steps · 60-90 minutes