# Cayley Graph Database MCP

> Open-source graph database MCP server for Cayley, providing AI agents with multi-backend graph storage, flexible query languages, and lightweight graph operations.

- **URL:** https://cayley.io/
- **Category:** Database & Messaging Mcp Servers
- **Tags:** Graph Database, Open Source, Multi Backend
- **Updated:** 2026-03-25 20:41
- **Canonical page:** https://mcpserver.ever.works/ar/items/cayley-graph-database-mcp

## Details

## Overview

Cayley MCP server provides AI-powered access to an open-source graph database with support for multiple storage backends and query languages.

## Features

- **Multiple Backends**: Use PostgreSQL, MongoDB, or in-memory storage
- **Flexible Queries**: Support for multiple query languages
- **Lightweight**: Minimal dependencies and resource usage
- **RESTful API**: HTTP API for graph operations
- **Open Source**: Apache 2.0 licensed

## Platform Capabilities

Cayley is an open-source graph database inspired by Google's Knowledge Graph, offering flexibility in storage backends and query interfaces.

## Use Cases

- Knowledge graphs
- Linked data applications
- Semantic web projects
- Lightweight graph storage
- Research and prototyping

## Key Benefits

- Backend flexibility (swap storage engines)
- Simple deployment
- Language-agnostic API
- Active open-source community
- Low overhead

## MCP Integration

Enables AI assistants to query graphs, manage data relationships, switch backends, and build knowledge graphs through conversational interfaces.

## Query Languages

Supports Gizmo (JavaScript-like) and MQL (influenced by Freebase) for graph queries.

## Use Case

Ideal for developers wanting graph database capabilities without heavy enterprise features or infrastructure requirements.

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