agent/harmonia_agent/model_catalog.py is the versioned pricing catalog. Unknown model prices fail closed. Each eligible invocation reserves an estimated amount before dispatch and resolves the reservation afterward as observed, not invoked, or uncertain.
UsageRecord in src/lib/types.ts records job, operation, stage, role, model, units, estimated and observed cost, pricing version, policy snapshot, trace ID, and timestamp. Job budgets track estimated, observed, reserved, limit, and approval-threshold USD values.
See Usage and budget tracking for the implementation map.