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AI usage covers billable work Darwin performs for a goal: AI execution rounds, runner time, paid tools, and skills. It appears as one expandable quote line with public dollar subcharges. Clarification, scoping questions, quote review, approvals, status checks, and ordinary human input are free. Darwin snapshots the applicable public usage catalog into the approved quote. A later catalog change cannot alter an existing authorization. Usage is captured when billable work runs, even if no seller deal ultimately settles. Darwin reverses usage for Darwin-caused failures or another explicit billing correction. AI usage is not included in the Network-fee base. If expected usage would exceed the approved ceiling, execution pauses with overage_approval_required.