Struct Message 

pub struct Message {
    pub role: Role,
    pub content: String,
    pub reasoning_content: String,
    pub tool_call_id: CompactString,
    pub tool_calls: SmallVec<[ToolCall; 4]>,
}

A message in the chat

Fields

role: Role

The role of the message

content: String

The content of the message

reasoning_content: String

The reasoning content

tool_call_id: CompactString

The tool call id

tool_calls: SmallVec<[ToolCall; 4]>

The tool calls

Implementations

impl Message

pub fn system(content: impl Into<String>) -> Message

Create a new system message

pub fn user(content: impl Into<String>) -> Message

Create a new user message

pub fn assistant( content: impl Into<String>, reasoning: Option<String>, tool_calls: Option<&[ToolCall]>, ) -> Message

Create a new assistant message

pub fn tool( content: impl Into<String>, call: impl Into<CompactString>, ) -> Message

Create a new tool message

pub fn builder(role: Role) -> MessageBuilder

Create a new message builder

pub fn estimate_tokens(&self) -> usize

Estimate the number of tokens in this message.

Uses a simple heuristic: ~4 characters per token.

Trait Implementations

impl Clone for Message

fn clone(&self) -> Message

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Message

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

Formats the value using the given formatter.

impl Default for Message

fn default() -> Message

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Message

fn deserialize<__D>( __deserializer: __D, ) -> Result<Message, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Message

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

where __S: Serializer,

Serialize this value into the given Serde serializer.