cost-ledger

cost-ledger is a TypeScript hooks module that runs inside Claude Code sessions to track all costs in real time: session, week, and month totals with budget progress, pace forecasting, and a detailed /costs pane showing prompt-cache breakdowns, expensive prompts, and context contributors. It provides cache lifetime awareness with warnings before re-caching, CSV export for accounting, and an optional keep-alive feature that periodically pings to hold the cache warm during idle time.