swiftide

Fast, streaming indexing, query, and agentic LLM applications in Rust

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Swiftide is a fast, streaming indexing and query library tailored for Retrieval Augmented Generation (RAG) in AI applications. It is built in Rust, utilizing parallel, asynchronous streams for blazingly fast performance. With Swiftide, users can easily build AI applications from idea to production in just a few lines of code. The tool addresses frustrations around performance, stability, and ease of use encountered while working with Python-based tooling. It offers features like fast streaming indexing pipeline, experimental query pipeline, integrations with various platforms, loaders, transformers, chunkers, embedders, and more. Swiftide aims to provide a platform for data indexing and querying to advance the development of automated Large Language Model (LLM) applications.

README:

Table of Contents

What is Swiftide?
- High level features
Latest updates on our blog 🔥
Examples
Vision
Features
- In detail
Getting Started
- Prerequisites
- Installation
Usage and concepts
- Indexing
- Querying
Contributing
Core Team Members
License

Swiftide

Fast, streaming indexing, query, and agentic LLM applications in Rust
Read more on swiftide.rs »

API Docs · Report Bug · Request Feature · Discord

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What is Swiftide?

Swiftide is a Rust library for building LLM applications. From performing a simple prompt completion, to building fast, streaming indexing and querying pipelines, to building agents that can use tools and call other agents.

High level features

Simple primitives for common LLM tasks
Build fast, streaming indexing and querying pipelines
Easily build agents, mix and match with previously built pipelines
A modular and extendable API, with minimal abstractions
Integrations with popular LLMs and storage providers
Ready to use pipeline transformations or bring your own
Build graph like workflows with Tasks
Langfuse support

Part of the bosun.ai project. An upcoming platform for autonomous code improvement.

We <3 feedback: project ideas, suggestions, and complaints are very welcome. Feel free to open an issue or contact us on discord.

[!CAUTION] Swiftide is under heavy development and can have breaking changes. Documentation might fall short of all features, and despite our efforts be slightly outdated. We recommend to always keep an eye on our github and api documentation. If you found an issue or have any kind of feedback we'd love to hear from you.

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Latest updates on our blog 🔥

Examples

Indexing a local code project, chunking into smaller pieces, enriching the nodes with metadata, and persisting into Qdrant:

indexing::Pipeline::from_loader(FileLoader::new(".").with_extensions(&["rs"]))
        .with_default_llm_client(openai_client.clone())
        .filter_cached(Redis::try_from_url(
            redis_url,
            "swiftide-examples",
        )?)
        .then_chunk(ChunkCode::try_for_language_and_chunk_size(
            "rust",
            10..2048,
        )?)
        .then(MetadataQACode::default())
        .then(move |node| my_own_thing(node))
        .then_in_batch(Embed::new(openai_client.clone()))
        .then_store_with(
            Qdrant::builder()
                .batch_size(50)
                .vector_size(1536)
                .build()?,
        )
        .run()
        .await?;

Querying for an example on how to use the query pipeline:

query::Pipeline::default()
    .then_transform_query(GenerateSubquestions::from_client(
        openai_client.clone(),
    ))
    .then_transform_query(Embed::from_client(
        openai_client.clone(),
    ))
    .then_retrieve(qdrant.clone())
    .then_answer(Simple::from_client(openai_client.clone()))
    .query("How can I use the query pipeline in Swiftide?")
    .await?;

Running an agent that can search code:

#[swiftide::tool(
    description = "Searches code",
    param(name = "code_query", description = "The code query")
)]
async fn search_code(
    context: &dyn AgentContext,
    code_query: &str,
) -> Result<ToolOutput, ToolError> {
    let command_output = context
        .executor()
        .exec_cmd(&Command::shell(format!("rg '{code_query}'")))
        .await?;

    Ok(command_output.into())
}

agents::Agent::builder()
    .llm(&openai)
    .tools(vec![search_code()])
    .build()?
    .query("In what file can I find an example of a swiftide agent?")
    .await?;

Agents loop over LLM calls, tool calls, and lifecycle hooks until a final answer is reached.

You can find more detailed examples in /examples

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Vision

Our goal is to create a fast, extendable platform for building LLM applications in Rust, to further the development of automated AI applications, with an easy-to-use and easy-to-extend api.

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Features

Simple primitives for common LLM tasks
Fast, modular streaming indexing pipeline with async, parallel processing
Experimental query pipeline
Experimental agent framework
A variety of loaders, transformers, semantic chunkers, embedders, and more
Bring your own transformers by extending straightforward traits or use a closure
Splitting and merging pipelines
Jinja-like templating for prompts
Store into multiple backends
Integrations with OpenAI, Groq, Gemini, Anthropic, Redis, Qdrant, Ollama, FastEmbed-rs, Fluvio, LanceDB, and Treesitter
Evaluate pipelines with RAGAS
Sparse vector support for hybrid search
tracing supported for logging and tracing, see /examples and the tracing crate for more information.
Tracing layer for exporting to Langfuse

In detail

Feature	Details
Supported Large Language Model providers	OpenAI (and Azure) Anthropic Gemini OpenRouter AWS Bedrock - Anthropic and Titan Groq - All models Ollama - All models
Agents	All the boiler plate for autonomous agents so you don't have to
Tasks	Build graph like workflows with tasks, combining all the above to build complex applications
Loading data	Files Scraping Fluvio Parquet Kafka Other pipelines and streams
Example and pre-build transformers and metadata generation	Generate Question and answerers for both text and code (Hyde) Summaries, titles and queries via an LLM Extract definitions and references with tree-sitter
Splitting and chunking	Markdown Text (text_splitter) Code (with tree-sitter)
Storage	Qdrant Redis LanceDB Postgres Duckdb
Query pipeline	Similarity and hybrid search, query and response transformations, and evaluation

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Getting Started

Prerequisites

Make sure you have the rust toolchain installed. rustup Is the recommended approach.

To use OpenAI, an API key is required. Note that by default async_openai uses the OPENAI_API_KEY environment variables.

Other integrations might have their own requirements.

Installation

Set up a new Rust project
Add swiftide
```
cargo add swiftide
```
Enable the features of integrations you would like to use in your Cargo.toml
Write a pipeline (see our examples and documentation)

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Usage and concepts

Before building your streams, you need to enable and configure any integrations required. See /examples.

We have a lot of examples, please refer to /examples and the Documentation

[!NOTE] No integrations are enabled by default as some are code heavy. We recommend you to cherry-pick the integrations you need. By convention flags have the same name as the integration they represent.

Indexing

An indexing stream starts with a Loader that emits Nodes. For instance, with the Fileloader each file is a Node.

You can then slice and dice, augment, and filter nodes. Each different kind of step in the pipeline requires different traits. This enables extension.

Nodes are generic over their inner type. This is a transition in progress, but when you BYO, feel free to slice and dice. The inner type can change midway through the pipeline.

from_loader (impl Loader) starting point of the stream, creates and emits Nodes
filter_cached (impl NodeCache) filters cached nodes
then (impl Transformer) transforms the node and puts it on the stream
then_in_batch (impl BatchTransformer) transforms multiple nodes and puts them on the stream
then_chunk (impl ChunkerTransformer) transforms a single node and emits multiple nodes
then_store_with (impl Storage) stores the nodes in a storage backend, this can be chained

Additionally, several generic transformers are implemented. They take implementers of SimplePrompt and EmbedModel to do their things.

[!WARNING] Due to the performance, chunking before adding metadata gives rate limit errors on OpenAI very fast, especially with faster models like gpt-5-nano. Be aware. The async-openai crate provides an exmponential backoff strategy. If that is still a problem, there is also a decorator that supports streaming in swiftide_core/indexing_decorators.

Querying

A query stream starts with a search strategy. In the query pipeline a Query goes through several stages. Transformers and retrievers work together to get the right context into a prompt, before generating an answer. Transformers and Retrievers operate on different stages of the Query via a generic statemachine. Additionally, the search strategy is generic over the pipeline and Retrievers need to implement specifically for each strategy.

That sounds like a lot but, tl&dr; the query pipeline is fully and strongly typed.

Pending The query has not been executed, and can be further transformed with transformers
Retrieved Documents have been retrieved, and can be further transformed to provide context for an answer
Answered The query is done

Additionally, query pipelines can also be evaluated. I.e. by Ragas.

Similar to the indexing pipeline each step is governed by simple Traits and closures implement these traits as well.

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Contributing

Swiftide is in a very early stage and we are aware that we lack features for the wider community. Contributions are very welcome. 🎉

If you have a great idea, please fork the repo and create a pull request. You can also simply open an issue with the tag "enhancement". Don't forget to give the project a star! Thanks again!

If you just want to contribute (bless you!), see our issues or join us on Discord.

Fork the Project
Create your Feature Branch (git checkout -b feature/AmazingFeature)
Commit your Changes (git commit -m 'feat: Add some AmazingFeature')
Push to the Branch (git push origin feature/AmazingFeature)
Open a Pull Request

See CONTRIBUTING for more

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Core Team Members

_timonv
_{open for swiftide consulting}

_tinco

License

Distributed under the MIT License. See LICENSE for more information.

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