> ## 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.

# LLM Plugin Protocol • Rust AI Agent SDK

> LLMPluginProtocol: LLM call hook plugin protocol

# LLMPluginProtocol

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

<Badge color="orange">Rust AI Agent SDK</Badge>

LLM call hook plugin protocol

## Methods

### `before_llm_call`

```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
fn before_llm_call(&self, _messages: &[LLMMessage]) -> Result<Option<Vec<LLMMessage>>, String>
```

Called before LLM call

**Parameters:**

| Name        | Type            |
| ----------- | --------------- |
| `_messages` | `&[LLMMessage]` |

## Source

<Card title="View on GitHub" icon="github" href="https://github.com/MervinPraison/PraisonAI/blob/main/src/praisonai-rust/praisonai/src/parity/plugins.rs">
  `praisonai/src/parity/plugins.rs` at line 0
</Card>

***

## Related Documentation

<CardGroup cols={2}>
  <Card title="Rust LLM" icon="microchip" href="/docs/rust/llm" />

  <Card title="Rust Providers" icon="server" href="/docs/rust/providers" />

  <Card title="Rust Failover" icon="shield" href="/docs/rust/failover" />

  <Card title="Rust Plugins" icon="plug" href="/docs/rust/plugins" />
</CardGroup>