Rulvar API reference / @rulvar/core / CachePolicy
Interface: CachePolicy
Defined in: packages/core/src/l0/messages.ts:110
The prompt-cache policy (RV2006): whether and how the agent loop compiles CacheHint onto every turn of its tool cycle. 'auto' (the default when no policy is declared anywhere) attaches breakpoints after tools, after system, and after the deepest message (sliding each turn) on adapters that declare ModelCaps.promptCaching: 'explicit'; adapters without the declaration, and providers whose caching is implicit server-side, never see a hint, so their wire traffic stays byte identical. 'off' is the opt-out. The hint is transport-level cost optimization only: it never enters identity, journals, or cassette keys. The third parity rerun priced the absence: every turn of a ~550k-token worker context re-paid the full input rate because nothing in the core ever populated the hint the adapter could compile.
Properties
| Property | Type | Description | Defined in |
|---|---|---|---|
mode? | "auto" | "off" | - | packages/core/src/l0/messages.ts:111 |
ttl? | CacheTtl | Breakpoint TTL; default '5m'. | packages/core/src/l0/messages.ts:113 |