Struct SystemPrompt 

pub struct SystemPrompt { /* private fields */ }

A structured system prompt with cache control breakpoints.

The system prompt is divided into a static prefix (stable across turns) and dynamic content. Cache control breakpoints mark positions where the provider should cache token computations.

Implementations

impl SystemPrompt

pub fn full_text(&self) -> &str

Returns the complete system prompt text.

pub fn cache_control_breakpoints(&self) -> &[usize]

Returns the byte positions where cache control markers should be inserted.

pub fn to_anthropic_format(&self) -> Value

Formats this system prompt for the Anthropic Messages API with cache_control markers at the appropriate breakpoints.

The output follows the Anthropic format:

{
  "system": [
    {"type": "text", "text": "...", "cache_control": {"type": "ephemeral"}},
    {"type": "text", "text": "..."}
  ]
}

Each section between breakpoints becomes a separate content block. The last block before each breakpoint gets a cache_control marker.

Trait Implementations

impl Clone for SystemPrompt

fn clone(&self) -> SystemPrompt

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SystemPrompt

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

Formats the value using the given formatter.