Struct UsageRecord 

pub struct UsageRecord {
    pub turn: usize,
    pub model: String,
    pub prompt_tokens: u64,
    pub completion_tokens: u64,
    pub total_tokens: u64,
    pub cached_tokens: Option<u64>,
    pub timestamp_ms: i64,
}

One model round-trip’s token accounting, with the context a bare Usage lacks: which turn it was and which model served it (D9 “model provenance” — obligation 6’s “served-model provenance” row). Deliberately flat/typed (not a formatted string) so it survives a save/load round trip byte-for-byte in the fields that matter, and so a future reader (a doctor/inspect stats command, a cost dashboard) can aggregate it without re-parsing text.

Fields

turn: usize

0-based index of the model round-trip this record covers (one per crate::AgentEvent::TurnCompleted, the same cadence UX-23 already uses).

model: String

The model id that served this turn (Config.model, or the mid-session-switched model once obligation 10 lands — recorded per-turn rather than once per session so a handoff is visible in the log, not just implied).

prompt_tokens: u64

Input tokens.

completion_tokens: u64

Output tokens.

total_tokens: u64

Total tokens (provider-reported; not always prompt + completion exactly, so kept as its own field rather than derived).

cached_tokens: Option<u64>

Prompt tokens served from the provider’s cache (B7), if reported.

timestamp_ms: i64

Unix-ms wall-clock time the record was created.

Implementations

impl UsageRecord

pub fn from_usage( turn: usize, model: &str, usage: &Usage, timestamp_ms: i64, ) -> UsageRecord

Build a record from a provider Usage plus the per-turn context a bare Usage doesn’t carry.

Trait Implementations

impl Clone for UsageRecord

fn clone(&self) -> UsageRecord

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for UsageRecord

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

Formats the value using the given formatter.

impl Default for UsageRecord

fn default() -> UsageRecord

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for UsageRecord

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for UsageRecord

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for UsageRecord

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 UsageRecord