Show HN: agent-usage-guard – a Claude Code mod to protect your usage window

agent-usage-guard is a Claude Code modification designed to protect the user's five-hour usage window. It prevents rapid consumption of the window by implementing various rules and limits. These include approval thresholds for new agents based on window fullness (80% asks, 95% refuses), limits on agents running concurrently (4 asks), agents started per 10 minutes (12 asks), and tokens processed by subagents (10M asks). It also manages context size, tool calls, and handles repetitive failures to optimize usage.