Struct UsageMetadata 

pub struct UsageMetadata {
    pub prompt_token_count: i32,
    pub candidates_token_count: i32,
    pub total_token_count: i32,
    pub cache_read_input_token_count: Option<i32>,
    pub cache_creation_input_token_count: Option<i32>,
    pub thinking_token_count: Option<i32>,
    pub audio_input_token_count: Option<i32>,
    pub audio_output_token_count: Option<i32>,
    pub cost: Option<f64>,
    pub is_byok: Option<bool>,
    pub provider_usage: Option<Value>,
}

Core traits and types.

Always available regardless of feature flags. Includes:

• Agent - The fundamental trait for all agents
• Tool / Toolset - For extending agents with capabilities
• Session / State - For managing conversation context
• Event - For streaming agent responses
• AdkError / Result - Unified error handling

Fields

prompt_token_count: i32

candidates_token_count: i32

total_token_count: i32

cache_read_input_token_count: Option<i32>

cache_creation_input_token_count: Option<i32>

thinking_token_count: Option<i32>

audio_input_token_count: Option<i32>

audio_output_token_count: Option<i32>

cost: Option<f64>

is_byok: Option<bool>

provider_usage: Option<Value>

Trait Implementations

impl Clone for UsageMetadata

fn clone(&self) -> UsageMetadata

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for UsageMetadata

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

Formats the value using the given formatter.

impl Default for UsageMetadata

fn default() -> UsageMetadata

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for UsageMetadata

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for UsageMetadata

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.