Struct MessageSegment 

pub struct MessageSegment {
    pub messages: Vec<Message>,
    pub tool_call_ids: HashSet<String>,
    pub is_tool_chain: bool,
    pub token_estimate: u32,
}

A segment of conversation that should be treated as atomic during truncation.

Ensures tool-call relationships are preserved: an assistant’s tool_call and the corresponding tool results form a single segment.

Fields

messages: Vec<Message>

Messages in this segment

tool_call_ids: HashSet<String>

Unique tool call IDs referenced in this segment

is_tool_chain: bool

Whether this segment contains a tool call chain (assistant call + results)

token_estimate: u32

Approximate token count (for sorting/filtering)

Implementations

impl MessageSegment

pub fn from_message(message: Message) -> Self

Create a new segment containing a single message.

pub fn merge(&mut self, other: MessageSegment)

Merge another segment into this one.

pub fn contains_tool_result(&self, tool_call_id: &str) -> bool

Check if this segment contains a tool result for the given tool call ID.

pub fn contains_tool_call(&self, tool_call_id: &str) -> bool

Check if this segment contains the tool call (assistant message) for the given ID.

pub fn get_missing_results(&self) -> Vec<&str>

Get the IDs of tool calls that are missing their results in this segment.

Trait Implementations

impl Clone for MessageSegment

fn clone(&self) -> MessageSegment

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MessageSegment

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

Formats the value using the given formatter.