Struct ContextMinimizer 

pub struct ContextMinimizer {
    pub max_turns: usize,
    pub strip_system_prompts: bool,
    pub strip_prior_tool_results: bool,
    pub max_context_chars: usize,
    /* private fields */
}

Strips unnecessary context from LLM request messages to reduce attack surface.

Implements the context-minimization pattern: only the minimum necessary context is forwarded to the LLM, reducing the window for prompt injection attacks embedded in prior conversation turns.

Fields

max_turns: usize

Maximum number of conversation turns to keep.

strip_system_prompts: bool

Whether to strip system prompts from forwarded tool contexts.

strip_prior_tool_results: bool

Whether to strip prior tool results from context.

max_context_chars: usize

Maximum total context characters.

Implementations

impl ContextMinimizer

pub fn new( max_turns: usize, strip_system_prompts: bool, strip_prior_tool_results: bool, max_context_chars: usize, ) -> Self

Create a new context minimizer with custom settings.

pub fn with_strip_pattern(self, pattern: &str) -> Self

Add a custom strip pattern.

pub fn minimize_context(&self, messages: &[Message]) -> Vec<Message>

Minimize a sequence of messages according to the configured policy.

Applies the following transformations in order:

1. Strip system prompts (if configured)
2. Strip tool results (if configured)
3. Keep only the last max_turns user/assistant pairs
4. Apply strip patterns to all remaining content
5. Truncate to max_context_chars total

pub fn minimize_text(&self, text: &str) -> String

Strip patterns from a single text string.

Trait Implementations

impl Debug for ContextMinimizer

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

Formats the value using the given formatter.

impl Default for ContextMinimizer

fn default() -> Self

Create a context minimizer with sensible defaults.

• Keep last 10 turns
• Strip system prompts from tool contexts
• Do not strip tool results by default
• 50,000 character maximum