inFlow Inventory MCP Server

A Model Context Protocol (MCP) server that provides comprehensive tools for interacting with the inFlow Inventory API. This enables AI assistants like Claude to manage your inventory, orders, customers, and more.

Current package version: 1.2.0

Features

• Products: List, search, create, update products and check inventory levels

• Sales Orders: Create customer orders and patch existing orders without dropping unmentioned lines or serial numbers

• Purchase Orders: Create vendor purchase orders, receive stock, and reverse received stock

• Customers & Vendors: Manage customer and vendor records

• Inventory Operations: Stock adjustments, transfers, counts, and manufacturing orders

• Manufacturing Orders: Create or patch work orders while preserving output/input lines and serial numbers

• Serial Numbers: Query serial numbers from orders or product inventory lines

• Reference Data: Locations, categories, pricing schemes, payment terms, currencies, tax codes

• Webhooks: Subscribe to inFlow events

Related MCP server: Skulabs MCP Server

Prerequisites

• Node.js 18 or higher

• An active inFlow Inventory subscription with API add-on

• inFlow API credentials (Company ID and API Key)

Installation

git clone https://github.com/bigl34/inflow-mcp-server.git
cd inflow-mcp-server

# Install dependencies
npm install

# Build the TypeScript
npm run build

Configuration

Getting Your API Credentials

1. Log in to your inFlow Inventory account

2. Go to Settings > Integrations

3. Find your Company ID on the integrations page

4. Click Add New API Key to generate a new key

Environment Variables

Set the following environment variables:

# Required
export INFLOW_COMPANY_ID="your-company-id"
export INFLOW_API_KEY="your-api-key"

# Optional
export INFLOW_BASE_URL="https://cloudapi.inflowinventory.com"  # Default
export INFLOW_API_VERSION="2025-06-24"  # Default API version
export INFLOW_RATE_LIMIT="60"  # Requests per minute (default: 60)
export INFLOW_REQUEST_TIMEOUT="30000"  # Request timeout in ms (default: 30000)
export INFLOW_MAX_RETRIES="3"  # Max retries on 5xx/429 errors (default: 3)
export INFLOW_RETRY_DELAY="1000"  # Initial retry delay in ms (default: 1000)
export INFLOW_DEBUG="true"  # Enable debug logging (default: false)

Claude Desktop Configuration

Add to your Claude Desktop configuration file:

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "inflow-inventory": {
      "command": "node",
      "args": ["/path/to/inflow-mcp-server/dist/index.js"],
      "env": {
        "INFLOW_COMPANY_ID": "your-company-id",
        "INFLOW_API_KEY": "your-api-key"
      }
    }
  }
}

Available Tools

Product Management

Sales Orders

Purchase Orders

Customers

Vendors

Inventory Operations

Serial Numbers

Reference Data

Webhooks

Usage Examples

List Products

List all active products in the "Electronics" category

Create a Sales Order

Create a sales order for customer "Acme Corp" with:
- 5 units of product SKU-001 at $29.99 each
- 10 units of product SKU-002 at $15.00 each
Required by next Friday

Patch a Sales Order

Update sales order SO-1001:
- change the required date to next Monday
- update line abc123 to quantity 2 with serial numbers SN-001 and SN-002
- remove line def456

Receive a Purchase Order

Receive all remaining items on purchase order PO-1001 at the Main Warehouse

Reverse a Purchase Order Receipt

Unreceive 1 unit of product SKU-001 from purchase order PO-1001 as a dry run first

Check Inventory

What's the current stock level for product "Widget Pro" across all locations?

Look Up Serial Numbers

Show all in-stock serial numbers for product "Widget Pro"

Create Stock Transfer

Transfer 50 units of "Widget Pro" from "Main Warehouse" to "Retail Store"

API Features

Filtering

Most list operations support filtering. For example:

list_products with name="Widget" and isActive=true

Pagination

Large result sets are paginated. Use skip and count parameters:

• count: Number of records to return (max 100)

• skip: Number of records to skip

Note: The default page size is 20 records. Always specify count when you need all records.

Sorting

All list operations support sorting:

• sort: Property name to sort by (e.g., "name", "modifiedDate", "orderDate")

• sortDesc: Set to true for descending order

list_products with sort="modifiedDate" and sortDesc=true

Total Count

To get the total number of matching records (useful for pagination UI), use includeCount:

list_sales_orders with status="Open" and includeCount=true

Response includes:

{
  "data": [...],
  "totalCount": 42
}

Smart Search

Some endpoints support smart parameter for fuzzy searching across multiple fields:

list_customers with smart="acme"  // Searches name, email, phone
list_sales_orders with smart="SO-2025"  // Searches order fields

Includes

Use the include parameter to fetch related data:

get_sales_order with include=["customer", "lines", "lines.product"]
get_product with include=["inventoryLines"]

Partial Updates

upsert_sales_order and upsert_manufacturing_order support safe partial updates when id is provided:

• Existing fields and lines that are not mentioned are preserved.

• Line patches merge by explicit line ID, or by product ID when there is exactly one matching line.

• Sales order lines listed in deleteLineIds are removed.

• Manufacturing order input lines listed in deleteInputLineIds are removed.

• Serial numbers can be patched without rebuilding the whole order manually.

Concurrency Control

When updating records, include the timestamp field from the original record to prevent conflicts.

Rate Limiting

The inFlow API has a rate limit of 60 requests per minute. This server implements:

• Token bucket rate limiting: Automatically paces requests to stay within limits

• Automatic retries: Retries on 5xx errors and rate limit (429) responses with exponential backoff

• Configurable limits: Override via INFLOW_RATE_LIMIT environment variable

Error Handling

The server returns descriptive error messages from the inFlow API. Common errors include:

• 401 Unauthorized: Invalid API key

• 404 Not Found: Resource doesn't exist

• 409 Conflict: Timestamp mismatch (record was modified)

• 429 Too Many Requests: Rate limit exceeded (automatically retried)

Development

# Watch mode for development
npm run dev

# Build for production
npm run build

# Run the server
npm start

# Run tests
npm test

# Run tests in watch mode
npm run test:watch

# Run tests with coverage
npm run test:coverage

API Documentation

• inFlow API Documentation

• inFlow API Support Guide

License

MIT