Haystack.

TL;DR — Haystack is a modular framework for search and RAG pipelines with retrievers, readers, routers, and evaluation.

What it is

It offers composable nodes for ingestion, indexing, retrieval, and generation across many backends.

Why it exists

You need explicit, debuggable RAG pipeline construction with pluggable components.

Install

pip install farm-haystack

Basic usage

from haystack import Pipeline
# add retriever and generator nodes
# run query pipeline

When to use, when to skip

Use it when this category is a bottleneck in your agent stack and you want faster delivery with fewer custom components.

Skip it when your workload is tiny, requirements are fixed, or a plain provider SDK plus a few local functions is enough.

Alternatives

Compare with adjacent tools in the same AI Native category and choose based on interface style, deployment model (hosted vs self-hosted), and team familiarity.

Verified against project documentation, June 2026.