Per-agent caps still let a multi-agent run overspend in aggregate: ten threads each "under budget" blow past the total, and a sub-agent or compaction call drawing context after the work is done is invisible to any single counter. Settle every thread, sub-agent, and compaction call against ONE shared ledger, abort each turn at its next usage-accounting boundary when the ledger hits zero, and feed the remaining balance back into the model's context so it steers its own spend.
Run Every Agent Thread Off One Shared Token Ledger That Aborts at the Budget Line
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