DocuGraph AI v1

Documentation RAG for coding agents: vector search, a documentation knowledge graph, agent memory, and an MCP server — with torch-free local embeddings (pure ONNX via fastembed).

The MCP stdio server is the primary surface: it plugs directly into Claude Code and other MCP clients. The CLI is for out-of-band index bootstrapping (crawl / index / search / stats / memory / graph / config).

Features

• Multi-source ingestion: crawl web docs, index local files, clone & index git repos, parse API specs
• Hybrid search: vector similarity + keyword (BM25), fused with RRF
• Documentation knowledge graph: entities/relationships over your docs (Kuzu via Graphiti)
• Agent memory: persistent, repository/branch-scoped key-value store
• Optional reranking: local multilingual cross-encoder (BAAI/bge-reranker-v2-m3), opt-in
• Torch-free: default embeddings and reranking run on ONNX — no PyTorch in the dependency tree

Quick start

Installation

pip install docugraph

Requires Python 3.11–3.13. CI runs the suite on all three, on Linux. Python 3.14 is excluded deliberately, for two independent reasons: kuzu 0.11.3 — the final release, and the version this package pins — publishes no 3.14 wheels for macOS or Windows, and fastembed's 3.14 requirement (onnxruntime>=1.24.2) cannot be satisfied alongside the onnxruntime<1.24 cap this package carries.

Or work from a checkout — clone this repository, then from its root:

# With uv (recommended)
uv sync --extra dev

# Or with pip
python -m venv .venv && source .venv/bin/activate
pip install -e '.[dev]'

First use downloads the default embedding model (BAAI/bge-small-en-v1.5, ~130 MB ONNX) and caches it under FASTEMBED_CACHE_PATH. Set that variable to keep the weights somewhere durable; unset, fastembed puts them in a fastembed_cache subdirectory of the system temp directory, which the OS is free to clear.

URL crawling needs a browser that the Python install does not include. Crawl4AI drives Playwright's Chromium, so run this once before using docugraph crawl or the crawl_url tool:

playwright install chromium
# On Linux, add --with-deps to install the browser's system libraries too:
#   playwright install --with-deps chromium

This is ~190 MB and is cached, so it is a one-off. index local, index git, search, memory and stats do not need it — only fetching a URL does.

MCP integration with Claude Code (primary surface)

The MCP server is a console script, so where it lives depends on how you installed the package. For an MCP client, an isolated tool install is the least fuss: it puts the script somewhere stable that does not move with a project directory.

pipx install docugraph      # or: uv tool install docugraph

Then ask your shell where it landed:

which docugraph-mcp         # macOS, Linux
where docugraph-mcp         # Windows

and use that exact path in your Claude Code MCP configuration:

{
  "mcpServers": {
    "docugraph": {
      "command": "<the path `which docugraph-mcp` printed>",
      "env": {}
    }
  }
}

An MCP client launches the server directly rather than through a shell, so it does not inherit your PATH: the short form "command": "docugraph-mcp" fails with No such file or directory even when that directory is on it. That is why the path is spelled out.

If you would rather not manage an install, this is equivalent and works straight from a checkout, with no path to update when it moves:

{
  "mcpServers": {
    "docugraph": {
      "command": "uv",
      "args": ["--directory", "/absolute/path/to/docugraph", "run", "docugraph-mcp"],
      "env": {}
    }
  }
}

From a checkout, clone this repository and run uv sync (pip install -e '.[dev]' works too). The script is then at .venv/bin/docugraph-mcp (Scripts\docugraph-mcp.exe on Windows), and that is the path to give the client.

The server speaks JSON-RPC over stdio and exposes nine tools:

Tool	Purpose
search_docs	Vector search over indexed documentation
hybrid_search	Vector + keyword (+ optional graph) fusion; rerank opt-in
crawl_url	Crawl a URL and index it ¹
index_git	Clone and index a git repository
memory_store	Store a value in repo/branch-scoped agent memory
memory_recall	Retrieve a stored value
graph_query	Query the documentation knowledge graph ²
graph_add	Extract entities/relationships from text into the graph ²
get_stats	Indexing statistics

¹ Needs Playwright's Chromium — see the installation step above. ² Needs an LLM configured — Ollama locally, or an OpenAI/Anthropic key. See the knowledge graph section.

CLI (index bootstrap + one-off commands)

Run these from the repository root. uv sync installs the docugraph command into the project's virtual environment but does not put that directory on your PATH, so each command below is prefixed with uv run. If you activated the virtual environment (source .venv/bin/activate, as the pip instructions do), drop the prefix and run them as bare docugraph ….

# Crawl and index documentation (needs the Chromium install from above)
uv run docugraph crawl https://fastapi.tiangolo.com/tutorial/first-steps/

# Index a local docs directory
uv run docugraph index local ./docs

# Search indexed content
uv run docugraph search "how to create a path operation"
uv run docugraph search "async error handling" --top-k 10

# Rerank with the local multilingual cross-encoder (downloads about 2 GB once)
uv run docugraph search "path operations" --rerank

# Documentation knowledge graph — needs an LLM (Ollama locally, or an
# OPENAI_API_KEY/ANTHROPIC_API_KEY); see "The documentation knowledge graph"
uv run docugraph graph add "FastAPI depends on Starlette and Pydantic."
uv run docugraph graph search "what does FastAPI depend on?"

# Agent memory
uv run docugraph memory set build.status green
uv run docugraph memory get build.status

# Stats + reset
uv run docugraph stats
uv run docugraph clear

# Configuration
uv run docugraph config show
uv run docugraph config init

# Run the MCP server manually (usually launched by the MCP client)
uv run docugraph mcp-server

Python API

import asyncio
from docugraph.ingestion.crawler import DocCrawler
from docugraph.ingestion.chunker import Chunker
from docugraph.storage.vector_store import VectorStore


async def main():
    crawler = DocCrawler()
    doc = await crawler.crawl_single("https://docs.python.org/3/tutorial/")

    chunker = Chunker()
    chunks = chunker.chunk_document(doc)

    store = VectorStore()  # embeds with fastembed by default
    store.add_chunks(chunks)

    results = store.search("how to use lists", top_k=5)
    for r in results:
        print(f"{r.score:.4f}: {r.chunk.content[:100]}...")


asyncio.run(main())

Configuration

Create ~/.docugraph/config.yaml (all fields optional — defaults shown):

storage:
  data_dir: ~/.docugraph/data

embeddings:
  provider: auto            # auto | fastembed | openai | ollama | cohere
  model: BAAI/bge-small-en-v1.5   # fastembed's default; see the note below
  # dimensions: auto-detected from the model
  batch_size: 32

crawler:
  max_concurrent: 5
  rate_limit: 2.0
  respect_robots: true

provider: auto resolves to fastembed (local ONNX) — nothing about your environment changes that, so documents are not sent anywhere for embedding unless you name a cloud provider. Set provider: openai (or cohere) to send them there; that is the request, and it needs a model named with it: the entry above is fastembed's own default and no cloud provider has one. Any field can be overridden by environment variable, e.g. DOCUGRAPH_EMBEDDINGS__MODEL or DOCUGRAPH_EMBEDDINGS__PROVIDER.

See docs/configuration.md for the full reference, including the embedding-model consistency guard and the graph LLM requirement.

The documentation knowledge graph

DocuGraph builds a temporal entity/relationship graph over your docs (Kuzu, via Graphiti). Embeddings for the graph are served by the same torch-free fastembed adapter — no embedding service required. However, Graphiti performs entity extraction with an LLM, so graph add / graph_query need an LLM configured (Ollama locally, or an OpenAI/Anthropic key). Without one, the graph tools degrade gracefully with a clear message; vector and keyword search are unaffected.

KuzuDB version

kuzu is pinned to ==0.11.3 in pyproject.toml (reached through graphiti-core[kuzu], which requires kuzu>=0.11.3). Kuzu is archived upstream — 0.11.3 is the final release — and its on-disk format is not stable before 1.0, so a database written by one Kuzu version may not be readable by another. Treat the pin as a migration boundary, not a floor: to move versions, upgrade and then re-ingest rather than pointing the new version at the old graph file.

Architecture

┌─────────────────────────────────────────────────────────────┐
│                      Interfaces                             │
│                 MCP server  │  CLI                          │
├─────────────────────────────────────────────────────────────┤
│                      Retrieval Layer                        │
│        Hybrid Search  │  Optional Rerank  │  Context        │
├─────────────────────────────────────────────────────────────┤
│                      Storage Layer                          │
│        LanceDB (Vectors)  │  Kuzu (Graph)  │  Memory        │
├─────────────────────────────────────────────────────────────┤
│                      Ingestion Pipeline                     │
│           Crawl4AI  │  Chunker  │  Graphiti extraction      │
└─────────────────────────────────────────────────────────────┘

Technology stack

• Embeddings & reranking: fastembed (pure ONNX, no torch) — default bge-small-en-v1.5; opt-in reranker bge-reranker-v2-m3
• Vector database: LanceDB (embedded)
• Graph database: Kuzu via Graphiti (temporal knowledge graphs)
• Web crawler: Crawl4AI (JS rendering, clean Markdown)
• MCP: Model Context Protocol for Claude Code integration
• Optional cloud/local backends: OpenAI, Cohere, Ollama (extras)

Acknowledgements

This project uses Crawl4AI (https://github.com/unclecode/crawl4ai) for web data extraction.

• fastembed — local ONNX embeddings, and the optional reranker.
• Graphiti — temporal knowledge-graph extraction.
• LanceDB — the embedded vector store.
• Kùzu — the embedded graph database.

License

Apache-2.0 — see LICENSE, and NOTICE for the Crawl4AI attribution.