Enum TurnMarker 

pub enum TurnMarker {
    Context {
        messages: usize,
        tools: usize,
        estimated_tokens: u64,
    },
    Usage {
        prompt_tokens: u64,
        completion_tokens: u64,
        total_tokens: u64,
        cached_tokens: Option<u64>,
        cost_usd: Option<f64>,
    },
    Finish {
        reason: FinishReason,
    },
    Retry {
        attempt: u32,
        delay_ms: u64,
        reason: String,
    },
    Aborted {
        source: String,
        messages: usize,
    },
    Effort {
        from: Option<String>,
        to: Option<String>,
    },
    Goal {
        objective: String,
    },
}

One bracketing marker. The marker tag is the record’s kind.

Variants

Context

Opens a round-trip: the shape of the context the request was built over, captured BEFORE the request is issued (so it survives a request that never returns).

Fields

messages: usize

Messages in the request.

tools: usize

Tool schemas advertised on the request.

estimated_tokens: u64

Estimated prompt tokens (crate::tokens’ own estimator — the same one the context guard uses, so the two never disagree).

Usage

The round-trip’s provider-reported token accounting, plus its dollar cost when the model is priceable (crate::pricing).

Fields

prompt_tokens: u64

Input tokens.

completion_tokens: u64

Output tokens.

total_tokens: u64

Provider-reported total.

cached_tokens: Option<u64>

Prompt tokens served from the provider’s cache, if reported.

cost_usd: Option<f64>

Dollar cost, None when this build cannot price the model.

Finish

Closes a round-trip (or the loop).

Fields

reason: FinishReason

Why it ended.

Retry

A transient provider failure was retried with backoff. Written from the notices the transport’s own retry loop records, so a retried request is visible in the log instead of being invisible the way the ledger’s auto-retry-on-transient-provider-errors row described.

Fields

attempt: u32

0-based attempt index that FAILED (attempt 0 is the first try).

delay_ms: u64

Backoff slept before the next attempt, milliseconds.

reason: String

One-line reason (HTTP status or transport error).

Aborted

The turn was interrupted (Ctrl-C / a cancelled send future). The partial work already appended to the transcript stands; this marker is what makes the interruption a FACT on reload rather than something a reader has to infer from a dangling tool call.

Fields

source: String

Where the interruption came from ("ctrl_c", "cancelled", …).

messages: usize

Messages in the agent’s history at the moment of the abort.

Effort

Reasoning effort changed mid-session (/effort), the extended- thinking analog of the model_change log.

Fields

from: Option<String>

Effort before the change (None = thinking off).

to: Option<String>

Effort after the change (None = thinking off).

Goal

The session’s persistent objective was set, changed, or cleared (/goal). The goal itself lives in <session>.goal.json; this is the audit trail of when it moved.

Fields

objective: String

The objective after the change; empty means cleared.

Trait Implementations

impl Clone for TurnMarker

fn clone(&self) -> TurnMarker

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TurnMarker

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for TurnMarker

fn deserialize<__D>( __deserializer: __D, ) -> Result<TurnMarker, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for TurnMarker

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for TurnMarker

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for TurnMarker