You'll notice
Useful2 Signal2
The stream-JSON schema now documents that a held-back result still carries cost and usage.
What's wrong with this entry?
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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.