Interface: ReceiptCacheMarker

Defined in: src/lib/time-travel/receipt.ts:221

One cache_control breakpoint the cache strategy actually APPLIED — three scalars, no bytes.

cache.transformHash collapses a whole rewrite into one bit ("something changed"), and a digest over the whole prepared request is not comparable across epochs. The question that decides an Anthropic bill is narrower and concrete: did the breakpoints move between call 3 and call 4? Two receipts' markersApplied answer it by inspection.

APPLIED, not offered: scope.cacheMarkers holds the CANDIDATES the strategy was given, and a strategy clamps them to what the provider allows. The candidates are on the record; which survived is not, which is why they ride here.

Example

did the breakpoints move between two turns?

import { receiptAt } from 'agentfootprint';

const at = (k: number) =>
  JSON.stringify(receiptAt(agent.getSnapshot()!, k)?.cache.markersApplied);
at(3) === at(4); // false ⇒ the cached prefix moved, and the bill with it