Struct Message 

pub struct Message {
    pub role: Role,
    pub content: Option<String>,
    pub tool_calls: Vec<ToolCall>,
    pub tool_call_id: Option<String>,
}

A single message in a conversation.

Fields

role: Role

Who produced this message.

content: Option<String>

Text content of the message (may be None for tool-call-only messages).

tool_calls: Vec<ToolCall>

Tool calls requested by the assistant.

tool_call_id: Option<String>

The tool call ID this message is responding to (for Role::Tool).

Implementations

impl Message

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

Create a system message.

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

Create a user message.

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

Create an assistant message with text content.

pub fn assistant_with_tool_calls(tool_calls: Vec<ToolCall>) -> Self

Create an assistant message that contains tool calls (no text).

pub fn assistant_with_text_and_tool_calls( content: impl Into<String>, tool_calls: Vec<ToolCall>, ) -> Self

Create an assistant message that carries both text and tool calls.

Models such as Anthropic and Gemini emit reasoning text alongside a tool call in the same turn; preserving both keeps replayed history faithful to what the model produced.

pub fn tool_result( tool_call_id: impl Into<String>, content: impl Into<String>, ) -> Self

Create a tool result message.

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<'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.