Struct PromptCacheConfig 

#[non_exhaustive]
pub struct PromptCacheConfig {
    pub enabled: bool,
    pub default_ttl: CacheTtl,
    pub auto_breakpoints: bool,
    pub min_system_tokens: usize,
}

Prompt caching configuration.

Controls automatic placement of cache breakpoints in the context pipeline. Active only when the provider advertises prompt_caching = true in ProviderCapabilities.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

enabled: bool

Master switch. When false, the context pipeline never adds cache markers regardless of the per-adapter settings. Default: true.

default_ttl: CacheTtl

Default TTL for automatically placed cache breakpoints. Default: CacheTtl::FiveMinutes.

auto_breakpoints: bool

When true, the context pipeline automatically inserts cache markers at three stable regions (system end, tools end, conversation tail). When false, only explicit per-ContentPart markers from adapters are honored. Default: true.

min_system_tokens: usize

Minimum estimated system-prompt token count before the system-end breakpoint is placed. Avoids wasting cache writes on tiny prompts. Default: 1024.

Implementations

impl PromptCacheConfig

pub fn new() -> Self

Creates a new PromptCacheConfig with defaults.

pub fn disabled() -> Self

Disables prompt caching entirely.

pub fn with_default_ttl(self, ttl: CacheTtl) -> Self

Sets the default TTL for auto-placed cache markers.

pub fn with_auto_breakpoints(self, enabled: bool) -> Self

Sets whether to auto-place cache breakpoints.

pub fn with_min_system_tokens(self, tokens: usize) -> Self

Sets the minimum system-prompt token count for the system breakpoint.

Trait Implementations

impl Clone for PromptCacheConfig

fn clone(&self) -> PromptCacheConfig

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PromptCacheConfig

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for PromptCacheConfig

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for PromptCacheConfig

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for PromptCacheConfig

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.