Enum StreamEvent 

pub enum StreamEvent {
    Delta(String),
    Reasoning(String),
    ThinkingBlock {
        text: String,
        signature: String,
    },
    ToolCallStart {
        id: String,
        name: String,
    },
    ToolCallDelta(String),
    ToolCallDone(ToolCall),
    Usage(TokenUsage),
    Done {
        truncated: bool,
    },
    Error(String),
    Warning(String),
}

Variants

Delta(String)

Reasoning(String)

Reasoning-model thinking content (e.g. MiniMax-M2.7, DeepSeek-R1, o1-series). Some OpenAI-compatible gateways route the full response here when content is empty — TurnRunner promotes it to the final text on Done if content ends up empty, which keeps us from silently returning 0-token “Nailed it” responses for reasoning models.

ThinkingBlock

One complete Anthropic extended-thinking content block. Emitted at content_block_stop by claude.rs after both thinking_delta and signature_delta have streamed in for a given block. The runner accumulates these into MessageContent::AssistantWithToolCalls. thinking_blocks so the next request can echo them back verbatim (Anthropic 400s otherwise: The content[].thinking in the thinking mode must be passed back to the API). Atomic per-block (vs streaming text + signature separately) keeps the runner from having to pair up out-of-order deltas across content blocks.

Fields

text: String

signature: String

ToolCallStart

Fields

id: String

name: String

ToolCallDelta(String)

ToolCallDone(ToolCall)

Usage(TokenUsage)

Done

Stream finished. truncated = true means finish_reason was “length” (model hit max_tokens and was cut off, should continue).

Fields

truncated: bool

Error(String)

Warning(String)

Non-fatal advisory the provider wants surfaced to the user. Unlike Error, the stream and the turn continue normally — the warning is a heads-up (e.g. “your proxy looks like it’s truncating input”), not a failure. The runner forwards it to TurnEvent::Warning so the TUI can render it without aborting.

Trait Implementations

impl Clone for StreamEvent

fn clone(&self) -> StreamEvent

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for StreamEvent

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

Formats the value using the given formatter.