Token Tracker

Token usage tracking per task and agent.

Rate limit window tracking with sliding time windows.

RateLimitWindow implements a simple token-bucket algorithm per time period (per-minute, per-hour, per-day). When token consumption within the current window reaches the configured maximum, is_exceeded() returns True and the orchestrator pauses task assignment for that agent type until the window resets.

This is used to detect when agents should back off to avoid API rate limits, not to enforce hard quotas (the API itself handles that).