Check token usage and cost for the session
slash commands
// what it does
/usage (and its alias /cost) shows token usage and cost for the current session, plus how much of your plan's rate limits you have consumed. In headless mode the same numbers come from --output-format json, whose payload includes total_cost_usd and a per-model breakdown. Use it to spot a runaway task before it burns budget.
// shell
$ /usage$ /cost// gotcha
On a subscription plan the cost figure is an estimate of equivalent API spend, not a bill — your usage is capped by plan rate limits, not charged per token. Console/API auth is the case where /usage reflects real money.