Enum OutputItem 

pub enum OutputItem {
    Message(MessageItem),
    Reasoning(ReasoningItem),
    FunctionCall(FunctionCallItem),
    FunctionCallOutput(FunctionCallOutputItem),
    Custom(CustomItem),
}

Output items generated by the model.

Per the Open Responses specification, items are polymorphic (discriminated by type), state machines (with status transitions), and streamable (through delta events).

Custom items serialize with their custom_type as the actual type field value (e.g., "type": "vtcode:file_change"), per the extension convention.

Variants

Message(MessageItem)

A message from the assistant, user, system, or developer.

Reasoning(ReasoningItem)

Model reasoning/thinking content.

FunctionCall(FunctionCallItem)

A function/tool call request from the model.

FunctionCallOutput(FunctionCallOutputItem)

Output from a function/tool call execution.

Custom(CustomItem)

Custom/extension item type (prefixed with implementor slug).

Implementations

impl OutputItem

pub fn id(&self) -> &str

Returns the unique identifier for this item.

pub fn status(&self) -> ItemStatus

Returns the current status of this item.

pub fn type_name(&self) -> &str

Returns the type name for this item.

pub fn message( id: impl Into<String>, role: MessageRole, content: Vec<ContentPart>, ) -> Self

Creates a new message item with the given parameters (status: InProgress).

pub fn completed_message( id: impl Into<String>, role: MessageRole, content: Vec<ContentPart>, ) -> Self

Creates a new completed message item with the given parameters.

pub fn reasoning(id: impl Into<String>) -> Self

Creates a new reasoning item.

pub fn function_call( id: impl Into<String>, name: impl Into<String>, arguments: Value, ) -> Self

Creates a new function call item.

pub fn function_call_output( id: impl Into<String>, call_id: Option<String>, output: impl Into<String>, ) -> Self

Creates a new function call output item (status: InProgress).

Use this for streaming scenarios. For completed tool results, use completed_function_call_output.

pub fn completed_function_call_output( id: impl Into<String>, call_id: Option<String>, output: impl Into<String>, ) -> Self

Creates a new completed function call output item.

Use this when the tool execution has finished and the output is final.

Trait Implementations

impl Clone for OutputItem

fn clone(&self) -> OutputItem

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for OutputItem

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for OutputItem

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for OutputItem

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for OutputItem

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 OutputItem