What problem does it solve? Practicing slow resonance breathing for vagal tone training and heart rate variability improvement requires consistent pacing, which is hard to maintain manually. This Skill guides you through configuring and running paced breathing sessions directly in the terminal with audio cues, visual progress, and automatic session logging. ## Core Features & Use Cases - Paced Breathing Sessions: Run guided breathing at 4.5-6.5 breaths per minute with customizable inhale-exhale ratios and durations from 1 to 60 minutes. - Time-of-Day Presets: Auto-selects balanced, extended, or calm presets based on the time of day, with support for custom routines. - Session Logging & Safety Constraints: Automatically logs sessions to a local file and enforces clinically grounded limits on breath ratios, cycle length, and exhale duration. - Use Case: A developer wants a daily 10-minute HRV training habit. They run a morning script that launches a quiet balanced session at 5s-5s ratio, logs adherence, and later tests personal resonance frequency using short sessions at different ratios alongside HRV biofeedback hardware. ## Quick Start Ask the assistant to help you install breathe-cli and start a 10-minute balanced breathing session with the default 5-5 ratio.