Struct Message 

pub struct Message {
    pub role: Role,
    pub content: Content,
}

A message in a prompt (PromptMessage per spec).

Per MCP 2025-11-25, content is a single ContentBlock (not an array).

Fields

role: Role

The role of this message (user or assistant)

content: Content

The content of this message (single ContentBlock)

Implementations

impl Message

pub fn new(role: Role, content: Content) -> Message

Create a new message.

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

Create a user message with text content.

pub fn assistant(text: impl Into<String>) -> Message

Create an assistant message with text content.

pub fn is_user(&self) -> bool

Check if this is a user message.

pub fn is_assistant(&self) -> bool

Check if this is an assistant 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<(), Error>

Formats the value using the given formatter.

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 IntoPromptResult for Message

fn into_prompt_result(self) -> PromptResult

Convert this value into a PromptResult.

impl PartialEq for Message

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

Equality operator ==.

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

Inequality operator !=.

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.

impl StructuralPartialEq for Message