beam_usage

beam_usage limits what each user may run and counts what they used.

beam_usage = { path = "../riverbeam/crates/beam_usage" }

Item	Role
UsagePlan	name, limits, overage_policy; UsagePlan::unlimited(name)
UsageLimits	Daily request and token limits, per-request tokens, allowed agents, modalities and models
OveragePolicy	HardBlock (default), SoftWarn, Throttle
UsageGuard	check(user_id, plan, input) -> GuardResult
GuardResult	allowed, reason, overage_policy
UsageTracker	record(user_id, event), get_usage(user_id) -> UsageSummary
UsageEvent, UsageSummary	What was used; totals for the current period
UsageStore	Counter storage trait; periods are UTC days
InMemoryUsageStore	The shipped store

There are no feature flags.

What each limit does, and which ones are not enforced yet, is in Usage quotas.