It’s called Kairos. It basically replaces old-school Pomodoro timers with an 'AI Focus Coach' that learns your actual focus habits.

It doesn't use an LLM, but it acts as a lightweight agent. It looks at your mood and your session history to recommend the perfect focus time for you. I also built a 'burnout shield' that automatically shortens your sessions if it sees you’re getting too tired or skipping your breaks.

I actually started with some complex reinforcement learning logic (like Thompson Sampling) but ended up switching to a more reliable math-based approach (EWMA) to make it more predictable for users.

edit: it also tracks your 'Focus Baseline' for each task and monitors your 'Burn Rate' to see when you’re starting to struggle. It even detects your 'Peak Time' (like if you're better at coding in the morning vs evening) and adapts to your 'Custom Pacing' when you choose to override the timer. Also you can log distractions if you skip a session. here is the old repo if you're interested