Struct ContextConfig 

pub struct ContextConfig {
    pub max_context_tokens: usize,
    pub system_prompt_tokens: usize,
    pub compaction: CompactionConfig,
    pub token_counter: Option<Arc<dyn TokenCounter>>,
    pub keep_recent: usize,
    pub keep_first: usize,
    pub tool_output_max_lines: usize,
}

Configuration for context management — model constraints + compaction policy.

CompactionConfig is a required field: if you set a context limit, compaction is always ready with sensible defaults. Compaction as a whole is disabled by setting context_config: None on AgentLoopConfig.

Fields

max_context_tokens: usize

Maximum context tokens (the model’s context window).

system_prompt_tokens: usize

Tokens reserved for the system prompt.

compaction: CompactionConfig

Compaction policy — always present when context limits are set.

token_counter: Option<Arc<dyn TokenCounter>>

Custom token counter. When None, uses HeuristicTokenCounter (chars/4). Set to a custom TokenCounter for model-specific tokenization.

keep_recent: usize

keep_first: usize

tool_output_max_lines: usize

Implementations

impl ContextConfig

pub fn counter(&self) -> &dyn TokenCounter

Returns the configured token counter, or the default heuristic (chars/4).

Trait Implementations

impl Clone for ContextConfig

fn clone(&self) -> ContextConfig

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ContextConfig

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

Formats the value using the given formatter.

impl Default for ContextConfig

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for ContextConfig

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ContextConfig

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

where __S: Serializer,

Serialize this value into the given Serde serializer.