> ## 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.
# RAG • Rust AI Agent SDK
> RAG: Main RAG pipeline.
# RAG
> Defined in the [**RAG**](../modules/rag) module.
Rust AI Agent SDK
Main RAG pipeline.
## Fields
| Name | Type | Description |
| --------- | ------------------- | ------------------------ |
| `config` | `RAGConfig` | Configuration |
| `model` | `String` | LLM model for generation |
| `sources` | `Vec<String>` | Knowledge sources |
## Methods
### `new`
```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
fn new() -> RAGBuilder
```
Create a new RAG builder
### `query`
```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
fn query(&self, question: &str) -> Result
```
Query the RAG pipeline (placeholder)
**Parameters:**
| Name | Type |
| ---------- | ------ |
| `question` | `&str` |
### `add_source`
```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
fn add_source(&mut self, source: impl Into) -> ()
```
Add a knowledge source
**Parameters:**
| Name | Type |
| -------- | ------------------------- |
| `source` | `impl Into<String>` |
### `build_context`
```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
fn build_context(&self, chunks: &[ContextChunk]) -> String
```
Build context from chunks
**Parameters:**
| Name | Type |
| -------- | ----------------- |
| `chunks` | `&[ContextChunk]` |
### `truncate_context`
```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
fn truncate_context(&self, context: &str, max_tokens: usize) -> String
```
Truncate context to fit token budget
**Parameters:**
| Name | Type |
| ------------ | ------- |
| `context` | `&str` |
| `max_tokens` | `usize` |
## Source
`praisonai/src/rag/mod.rs` at line 467
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