Struct TokenCounts 

pub struct TokenCounts {
    pub input_tokens: u64,
    pub cache_creation_input_tokens: u64,
    pub cache_read_input_tokens: u64,
    pub output_tokens: u64,
    pub reasoning_output_tokens: u64,
    pub total_tokens: u64,
    pub cost_usd: f64,
}

Immutable token count snapshot with pre-computed total.

This is the serialisable form of UsageAccumulator, used in report output (JSON, table rows, etc.). The total_tokens field is eagerly computed so consumers do not need to sum the components themselves.

Implements Serialize + Deserialize for JSON round-tripping.

Fields

input_tokens: u64

Fresh (non-cached) prompt tokens.

cache_creation_input_tokens: u64

Tokens written to the prompt cache.

cache_read_input_tokens: u64

Tokens served from the prompt cache.

output_tokens: u64

Model output tokens (includes reasoning tokens unless billed separately).

reasoning_output_tokens: u64

Reasoning/chain-of-thought tokens (subset of output).

total_tokens: u64

Pre-computed input + cache_creation + cache_read + output.

cost_usd: f64

Estimated cost in US dollars.

Implementations

impl TokenCounts

pub fn add_assign(&mut self, other: TokenCounts)

Accumulate another TokenCounts into this one (mutable addition).

Trait Implementations

impl Clone for TokenCounts

fn clone(&self) -> TokenCounts

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TokenCounts

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

Formats the value using the given formatter.

impl Default for TokenCounts

fn default() -> TokenCounts

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for TokenCounts

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for TokenCounts

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

where __S: Serializer,

Serialize this value into the given Serde serializer.