> ## Documentation Index
> Fetch the complete documentation index at: https://docs.instructorphp.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

# Retrieval

InstructorPHP Retrieval provides one replaceable store contract for direct
vector persistence, bounded similarity search, document indexing, and RAG.

The package bundles in-memory, Pgvector, Qdrant, Typesense, Meilisearch,
Weaviate, and Milvus drivers behind one registry and store contract. Indexing
composes Polyglot embeddings through `Vectorizer`; semantic queries use the same
declared embedding space and remain lazy through `PendingRetrieval`.
`ContextAssembler` creates citation-labelled textual evidence under hard byte,
token, evidence, and excerpt budgets. Generation remains an explicit
`Inference` or `StructuredOutput` call.

See the [package README](https://github.com/cognesy/instructor-php/tree/main/packages/retrieval)
for installation, complete examples, driver options and capabilities,
large-corpus traversal, live-test setup, Agents integration, observability,
and the current multimodal support boundary.