Enum StopReason 

#[non_exhaustive]
pub enum StopReason {
    EndTurn,
    ToolUse,
    MaxTokens,
    Refusal,
    ContentFiltered,
    PauseTurn,
}

Why the model stopped generating.

Marked #[non_exhaustive]: providers keep introducing new stop reasons, so downstream matches must include a wildcard arm and adding a variant is not a breaking change.

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.

EndTurn

The model finished its response naturally.

ToolUse

The model wants to call one or more tools.

MaxTokens

The response was truncated due to max token limits.

Refusal

The model declined to answer, e.g. for safety reasons.

ContentFiltered

A provider-side guardrail or content filter blocked the output.

PauseTurn

The provider paused mid-turn (e.g. during a server-tool loop); the turn can be continued with a follow-up request.

Trait Implementations

impl Clone for StopReason

fn clone(&self) -> StopReason

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for StopReason

impl Debug for StopReason

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

Formats the value using the given formatter.

impl Eq for StopReason

impl PartialEq for StopReason

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for StopReason