Struct TokenUsage 

pub struct TokenUsage {
    pub input_tokens: u64,
    pub output_tokens: u64,
    pub cache_read_input_tokens: Option<u64>,
    pub cache_creation_input_tokens: Option<u64>,
}

Token usage statistics

Tracks the number of tokens used in a session or query. Can be parsed from SDK’s ResultMessage.usage field.

Fields

input_tokens: u64

Number of input tokens

output_tokens: u64

Number of output tokens

cache_read_input_tokens: Option<u64>

Number of tokens read from cache

cache_creation_input_tokens: Option<u64>

Number of tokens written to cache

Implementations

impl TokenUsage

pub fn new() -> Self

Create a new empty token usage

pub fn from_sdk_usage(usage: &Value) -> Self

Parse from SDK’s usage JSON value

Arguments

• usage - The usage field from ResultMessage or AssistantMessage

pub fn add(&mut self, other: &TokenUsage)

Add another usage to this one

pub fn total(&self) -> u64

Get total token count (input + output)

pub fn is_empty(&self) -> bool

Check if any tokens were used

Trait Implementations

impl Clone for TokenUsage

fn clone(&self) -> TokenUsage

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TokenUsage

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

Formats the value using the given formatter.

impl Default for TokenUsage

fn default() -> TokenUsage

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for TokenUsage

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for TokenUsage

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

where __S: Serializer,

Serialize this value into the given Serde serializer.