Struct ContextModifier 

pub struct ContextModifier {
    pub system_injection: Option<String>,
    pub max_tokens_override: Option<u32>,
    pub custom_context: Vec<(String, Value)>,
    pub max_steps_delta: Option<i32>,
}

Modifier that a tool can return to change agent runtime behavior.

Attach to ToolOutput via .with_modifier(). The agent loop applies these after tool execution — injecting system messages, adjusting token limits, etc.

Fields

system_injection: Option<String>

Inject a message into context for the next LLM call.

max_tokens_override: Option<u32>

Override max_tokens for subsequent calls.

custom_context: Vec<(String, Value)>

Add key-value pairs to AgentContext.custom.

max_steps_delta: Option<i32>

Adjust remaining max_steps (positive = more steps allowed).

Implementations

impl ContextModifier

pub fn system(msg: impl Into<String>) -> ContextModifier

pub fn max_tokens(tokens: u32) -> ContextModifier

pub fn custom(key: impl Into<String>, value: Value) -> ContextModifier

pub fn extra_steps(delta: i32) -> ContextModifier

pub fn is_empty(&self) -> bool

Trait Implementations

impl Clone for ContextModifier

fn clone(&self) -> ContextModifier

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ContextModifier

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

Formats the value using the given formatter.

impl Default for ContextModifier

fn default() -> ContextModifier

Returns the “default value” for a type.