> ## Documentation Index
> Fetch the complete documentation index at: https://praison.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Usage Event • AI Agent SDK

> UsageEvent: Token usage update.

# UsageEvent

> Defined in the [**events**](../modules/events) module.

<Badge color="blue">AI Agent</Badge>

Token usage update.

Attributes:
input\_tokens: Number of input tokens consumed.
output\_tokens: Number of output tokens generated.
cache\_creation\_input\_tokens: Tokens used for cache creation.
cache\_read\_input\_tokens: Tokens read from cache.

## Properties

<ResponseField name="input_tokens" type="int">
  No description available.
</ResponseField>

<ResponseField name="output_tokens" type="int">
  No description available.
</ResponseField>

<ResponseField name="cache_creation_input_tokens" type="int">
  No description available.
</ResponseField>

<ResponseField name="cache_read_input_tokens" type="int">
  No description available.
</ResponseField>

## Source

<Card title="View on GitHub" icon="github" href="https://github.com/MervinPraison/PraisonAI/blob/main/src/praisonai-agents/praisonaiagents/managed/events.py#L186">
  `praisonaiagents/managed/events.py` at line 186
</Card>