Enum Message 

#[non_exhaustive]
pub enum Message {
    Human(HumanMessage),
    Ai(AiMessage),
    System(SystemMessage),
    Tool(ToolMessage),
}

Top-level message enum — all message types the system handles.

REVIEW(002): #[non_exhaustive] per library-design.md

This enum will grow (e.g. FunctionMessage, ToolResultMessage, RemoveMessage). Without non_exhaustive, adding a variant is a breaking change for downstream match arms. With it, users must have a _ => arm, enabling safe evolution.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Human(HumanMessage)

Ai(AiMessage)

System(SystemMessage)

Tool(ToolMessage)

Implementations

impl Message

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

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

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

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

pub fn tool_with_metadata( content: impl Into<String>, tool_call_id: impl Into<String>, metadata: Option<HashMap<String, Value>>, duration_ms: Option<u64>, ) -> Self

Create a tool message with metadata and duration.

pub fn id(&self) -> Option<&str>

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.