Struct Turn 

pub struct Turn {
    pub request_id: Option<String>,
    pub ts: Option<Timestamp>,
    pub model: Option<String>,
    pub usage: Usage,
    pub cost_usd: Option<f64>,
    pub sidechain: bool,
    pub summary: Option<String>,
    pub tools: Vec<String>,
    pub has_thinking: bool,
    pub thinking_chars: u64,
    pub thinking_encrypted: bool,
}

One deduplicated API request in a session, enriched for display.

usage is the finalized per-request usage (post-dedup); cost_usd is None when the model is unpriced (§8.7 — never guessed). summary/tools are display-only and may be empty without affecting the numbers.

Fields

request_id: Option<String>

ts: Option<Timestamp>

model: Option<String>

usage: Usage

cost_usd: Option<f64>

USD cost of this request, or None when the model is unpriced.

sidechain: bool

The request came from a sub-agent (sidechain) transcript folded into this session (§8.3).

summary: Option<String>

Short visible-text snippet for display (first non-empty across the request’s lines), when available.

tools: Vec<String>

Tool names invoked in this request, in first-seen order (deduplicated).

has_thinking: bool

Thinking blocks were present (measurable or encrypted).

thinking_chars: u64

Visible thinking chars in this request — already inside usage.output (Claude Code), surfaced for attribution, never billed again (§8.2).

thinking_encrypted: bool

Thinking present but encrypted/unmeasurable: the thinking share of output is unknown (absence ≠ zero, §8.5).

Trait Implementations

impl Clone for Turn

fn clone(&self) -> Turn

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Turn

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

Formats the value using the given formatter.

impl Serialize for Turn

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

where __S: Serializer,

Serialize this value into the given Serde serializer.