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]>,
    pub sender: CompactString,
}

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

sender: CompactString

The sender identity (runtime-only, never serialized to providers).

Convention: empty = local/owner, "tg:12345" = Telegram user, "dc:67890" = Discord user.

Implementations

impl Message

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

Create a new system message

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

Create a new user message

pub fn user_with_sender( content: impl Into<String>, sender: impl Into<CompactString>, ) -> Self

Create a new user message with sender identity.

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

Create a new assistant message

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

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

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<Self, __D::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::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.