> ## 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.

# Estimate Messages Tokens • Rust AI Agent SDK

> estimate_messages_tokens: Estimate tokens for messages.

# estimate\_messages\_tokens

<div className="flex items-center gap-2">
  <Badge color="teal">Function</Badge>
</div>

> This function is defined in the [**context**](../modules/context) module.

Estimate tokens for messages.

## Signature

```python theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
def estimate_messages_tokens(messages: &[serde_json::Value]) -> usize
```

## Parameters

<ParamField query="messages" type="&" required={true}>
  No description available.
</ParamField>

### Returns

<ResponseField name="Returns" type="usize">
  The result of the operation.
</ResponseField>

## Uses

* `get`
* `estimate_tokens_heuristic`

## Source

<Card title="View on GitHub" icon="github" href="https://github.com/MervinPraison/PraisonAI/blob/main/src/praisonai-rust/praisonai/src/context/mod.rs#L325">
  `praisonai/src/context/mod.rs` at line 325
</Card>

***

## Related Documentation

<CardGroup cols={2}>
  <Card title="Rust Token Management" icon="coins" href="/docs/rust/token-management" />

  <Card title="Rust Budget" icon="wallet" href="/docs/rust/budget" />
</CardGroup>