Struct CacheConfig 

pub struct CacheConfig {
    pub strategy: CacheStrategy,
    pub static_ttl: CacheTtl,
    pub message_ttl: CacheTtl,
}

Cache configuration for prompt caching.

Implements Anthropic’s prompt caching best practices:

• Static content (system prompt, CLAUDE.md) uses longer TTL (1 hour default)
• Dynamic content (messages) uses shorter TTL (5 minutes default)
• Long TTL content must come before short TTL content in requests

Fields

strategy: CacheStrategy

Cache strategy determining which content types to cache

static_ttl: CacheTtl

TTL for static content (system prompt, tools, CLAUDE.md)

message_ttl: CacheTtl

TTL for message content (last user turn)

Implementations

impl CacheConfig

pub fn disabled() -> Self

Create a disabled cache configuration

pub fn system_only() -> Self

Create a system-only cache configuration

pub fn messages_only() -> Self

Create a messages-only cache configuration

pub fn with_strategy(self, strategy: CacheStrategy) -> Self

Set the cache strategy

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

Set the TTL for static content

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

Set the TTL for message content

pub fn message_ttl_option(&self) -> Option<CacheTtl>

Get message TTL if message caching is enabled, None otherwise.

This is a convenience method to avoid duplicating the cache_messages() check at every call site.

Trait Implementations

impl Clone for CacheConfig

fn clone(&self) -> CacheConfig

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CacheConfig

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

Formats the value using the given formatter.

impl Default for CacheConfig

fn default() -> Self

Returns the “default value” for a type.