Struct Message 

pub struct Message {
    pub role: MessageRole,
    pub content: String,
    pub metadata: MessageMeta,
    pub tool_name: Option<String>,
    pub tool_call_id: Option<String>,
    pub tool_calls: Option<Vec<ToolCallInfo>>,
}

A conversation message with dual serialization format support.

Fields

role: MessageRole

Message role (system, user, assistant, tool).

content: String

Main text content of the message.

metadata: MessageMeta

Metadata tagging for tracking and budget decisions.

tool_name: Option<String>

Tool name associated with the message, if it is a tool response.

tool_call_id: Option<String>

Tool call identifier paired with this message.

tool_calls: Option<Vec<ToolCallInfo>>

List of tool call invocations, if this is an assistant message.

Implementations

impl Message

pub fn new( role: MessageRole, content: impl Into<String>, metadata: MessageMeta, ) -> Self

Creates a new Message.

pub fn with_tool_name(self, name: impl Into<String>) -> Self

Sets the tool name.

pub fn with_tool_call_id(self, id: impl Into<String>) -> Self

Sets the tool call ID.

pub fn with_tool_calls(self, calls: Vec<ToolCallInfo>) -> Self

Sets the list of tool calls.

pub fn serialize(&self, format: &str) -> Value

Serialize this message for an LLM API.

Format “ollama” (default): tool calls have no id/type, args as dict. Format “openai”: tool calls have id, type=“function”, args as JSON string.

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.