Grocy MCP

A Model Context Protocol (MCP) server for Grocy, the self-hosted household ERP for groceries, inventory, chores, batteries, recipes, tasks, and shopping lists.

This server focuses on AI-friendly household operations that are awkward through generic REST clients:

• Inspect Grocy system/version status
• List, search, and inspect products
• Read current stock, volatile stock, product stock details, and individual stock entries
• List current shopping list items and add/remove products from shopping lists
• Look up products by barcode/Grocycode
• List and inspect any /api/objects/{entity} entity
• Create/update generic entity objects from JSON
• Add, consume, and inventory product stock
• Add/remove product amounts from shopping lists

Why this exists

Grocy has a strong REST API, but MCP coverage is sparse and usually either incomplete or tightly coupled to one client's workflow. This package gives Hermes, Claude Desktop, Cursor, and other MCP clients a small, explicit, documented tool surface.

Installation

pipx install git+https://github.com/rusty4444/grocy-mcp.git

Or from a checkout:

python -m venv .venv
source .venv/bin/activate
pip install -e .

Configuration

The server reads configuration from environment variables:

Grocy API keys are managed in Grocy under Manage API keys. The API accepts the GROCY-API-KEY header.

MCP client config

{
  "mcpServers": {
    "grocy": {
      "command": "grocy-mcp",
      "env": {
        "GROCY_BASE_URL": "https://grocy.example.com",
        "GROCY_API_KEY": "your-api-key"
      }
    }
  }
}

Tools

Development and validation

python -m venv .venv
source .venv/bin/activate
pip install -e '.[dev]'
ruff check .
pytest
python scripts/live_readonly_test.py

The live read-only test defaults to https://demo.grocy.info, avoiding mutations on shared infrastructure. It has been validated against Grocy API 4.6.0. Use a private Grocy instance plus GROCY_API_KEY for write-path testing.

Safety

Write-capable tools directly mutate Grocy data. Prefer read-only tools when using public demos. Keep GROCY_API_KEY in MCP client environment config or a secret manager, never in source control.