Enum StopReason 

pub enum StopReason {
    EndTurn,
    MaxTokens,
    StopSequence,
    ToolUse,
    ContentFilter,
    Other(String),
}

Normalized reason the model stopped generating.

Maps the per-provider stop-reason strings into one shared enum so downstream consumers can distinguish “ran out of room” (MaxTokens) from “finished naturally” (EndTurn) without knowing which provider produced the response. Without this, a truncated completion might otherwise surface as a parse error with no hint that the model ran out of max_tokens.

Variants

EndTurn

Model finished generating naturally. Anthropic end_turn, OpenAI stop, Bedrock end_turn.

MaxTokens

Generation hit the max_tokens budget and was truncated. Anthropic max_tokens, OpenAI length, Bedrock max_tokens.

StopSequence

A configured stop sequence appeared in the output. Anthropic stop_sequence, OpenAI stop with a sequence match, Bedrock stop_sequence.

ToolUse

Model emitted a tool-use block as its terminal action. Anthropic tool_use, Bedrock tool_use. OpenAI uses tool_calls.

ContentFilter

Provider-side safety / content filter aborted generation. OpenAI content_filter, Bedrock content_filtered or guardrail_intervened.

Other(String)

An upstream-specific stop-reason value we don’t normalize. Carries the raw string so logs and downstream parsing can still see what the provider sent.

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 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