Struct Usage 

#[non_exhaustive]
pub struct Usage {
    pub input_tokens: Option<u64>,
    pub output_tokens: Option<u64>,
    pub cache_read_tokens: Option<u64>,
    pub cache_write_tokens: Option<u64>,
    pub cost_usd: Option<f64>,
    pub premium_requests: Option<u64>,
}

Token and cost accounting for a run.

Every field is optional because the three agents report different subsets: Claude reports full token counts and a dollar cost, Codex reports tokens, Copilot reports premium requests and no tokens at all. An absent field means “this agent did not say”, never zero.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

input_tokens: Option<u64>

Non-cached input tokens.

output_tokens: Option<u64>

Generated tokens.

cache_read_tokens: Option<u64>

Input tokens served from the prompt cache.

cache_write_tokens: Option<u64>

Input tokens written into the prompt cache.

cost_usd: Option<f64>

Cost in USD, when the agent priced the run itself. Never inferred from a local price table, because a guessed cost is worse than no cost.

premium_requests: Option<u64>

Copilot’s premium-request count, its only usage unit.

Implementations

impl Usage

pub fn is_empty(&self) -> bool

Whether the agent reported anything at all.

Trait Implementations

impl Clone for Usage

fn clone(&self) -> Usage

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Usage

impl Debug for Usage

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

Formats the value using the given formatter.

impl Default for Usage

fn default() -> Usage

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Usage

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Usage

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for Usage

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Usage