Enum MessageItem 

pub enum MessageItem {
    Output(InputOutputMessage),
    Input(InputMessage),
}

Message item within Item. Untagged; disambiguated by the role field: the Output variant requires role: "assistant" (via AssistantRole, which is a single-variant enum) and Input requires role in "user" | "system" | "developer" (via InputRole). A payload with an unknown role (e.g. "tool") or a missing role produces the generic untagged-enum error — callers are expected to send a valid role. If you see the “data did not match any variant of untagged enum” failure on this type, it is almost always a role mismatch.

Variants

Output(InputOutputMessage)

Prior assistant output echoed back (role: assistant). Tried first — its role constraint excludes user/system/developer inputs.

Input(InputMessage)

User / system / developer input message.

Trait Implementations

impl Clone for MessageItem

fn clone(&self) -> MessageItem

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for MessageItem

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for MessageItem

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for MessageItem

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for MessageItem

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for MessageItem