Enum Message 

pub enum Message {
    System(String),
    User(String),
    Assistant {
        text: Option<String>,
        tool_calls: Vec<ToolCall>,
    },
    ToolResult {
        id: String,
        content: String,
        is_error: bool,
    },
}

One conversation message. Assistant may carry tool calls; ToolResult feeds a tool’s output back into the conversation as the next observation.

Variants

System(String)

User(String)

Assistant

Fields

text: Option<String>

tool_calls: Vec<ToolCall>

ToolResult

A tool/exec result fed back into the loop. is_error carries the MCP isError: true signal: the tool ran and reported a domain failure the model should see and react to. A transport error never reaches here — it fails the call instead of becoming an observation.

Fields

id: String

content: String

is_error: bool

Implementations

impl Message

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

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

pub fn tool_result( id: impl Into<String>, content: impl Into<String>, is_error: bool, ) -> 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 PartialEq for Message

fn eq(&self, other: &Message) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Message