Struct ContextCompactionPolicy 

#[non_exhaustive]
pub struct ContextCompactionPolicy {
    pub max_input_tokens: u32,
    pub keep_recent_turns: usize,
}

Available on crate feature conversation only.

Policy controlling when and how Conversation drops older turns to stay under a token budget.

v0.3 first cut implements truncation: oldest complete user→assistant roundtrips are dropped until either the estimated input is under Self::max_input_tokens or only Self::keep_recent_turns complete roundtrips remain. Tool-use / tool-result pairs are preserved as a unit (an assistant turn with tool_use blocks is never dropped without its matching tool_result user turn and follow-up assistant text).

Token estimation is a fast local heuristic (~4 chars/token); for exact counts use Conversation::estimate_input_tokens only as a hint, and configure max_input_tokens with some headroom.

Future work (v0.4): callback-based summarization that replaces a span of old turns with a single text summary instead of dropping them.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

max_input_tokens: u32

Compact when the estimated input would exceed this many tokens.

keep_recent_turns: usize

After compaction, keep at least this many complete roundtrips.

Trait Implementations

impl Clone for ContextCompactionPolicy

fn clone(&self) -> ContextCompactionPolicy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ContextCompactionPolicy

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

Formats the value using the given formatter.

impl Default for ContextCompactionPolicy

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for ContextCompactionPolicy

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for ContextCompactionPolicy

fn eq(&self, other: &ContextCompactionPolicy) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for ContextCompactionPolicy

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for ContextCompactionPolicy

impl StructuralPartialEq for ContextCompactionPolicy