You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
SDKArea: what it touches
ImprovementsKind: in v2.1.239,
ImprovementsSection of the release
What
The schema shipped to SDK consumers now documents that a result withheld while background subagents finish still carries its total cost, API duration and per-model usage as of the moment it was written, not just the subagent counters.
Evidence
as do its total_cost_usd, duration_api_ms and modelUsage
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
