A unit of work should be meaningful to the business and specific enough to measure. It might be a qualified account research packet, a governed support resolution, a reconciled supplier invoice, a tested release candidate, or an approved contract comparison. Counting prompts or tokens alone describes technical consumption, not the business object being produced. The unit needs a clear start, terminal state, owner, customer or function where relevant, and quality criteria.
The ledger should connect the unit to stable identifiers: organization, customer, package, entitlement, workflow, run, approval, provider request, usage event, supplier account, and outcome. Not every workflow needs every identifier, but the grain must remain clear. If costs are aggregated by month before they are linked to work, finance may know total spend while remaining unable to explain margin by customer, product, or operating function.
Status is part of the economic record. Drafted, validated, approved, attempted, provider-accepted, delivered, refunded, failed, and reconciled units consume different resources and create different value. Failed work is still economically real. Capturing it allows the company to see whether retries, provider errors, poor source data, or unclear approvals are driving expense without useful output.