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feat: complete n8n integration with MCP Client Tool support and version badge automation

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This major update adds comprehensive n8n integration, enabling n8n-mcp to run
as an MCP server within n8n workflows using the MCP Client Tool node.

## Key Features

### n8n Integration (NEW)
- Full MCP Client Tool compatibility with protocol version negotiation
- Dedicated n8n mode with optimized Docker deployment
- Workflow examples and n8n-friendly tool descriptions
- Quick deployment script for easy setup

### Protocol & Compatibility
- Intelligent protocol version selection (2024-11-05 for n8n, 2025-03-26 for others)
- Fixed schema validation issues with n8n's nested output format
- Enhanced parameter validation with clear error messages
- Comprehensive test suite for protocol negotiation

### Security Enhancements
- Dynamic UID/GID generation (10000-59999) for Docker containers
- Improved error sanitization for production environments
- Fixed information leakage in error responses
- Enhanced permission handling for mounted volumes

### Performance Optimizations
- Docker build time reduced from 13+ minutes to 1-2 minutes
- Image size reduced from ~1.5GB to ~280MB
- Fixed ARM64 build failures
- Optimized to use runtime-only dependencies

### Developer Experience
- Comprehensive parameter validation for all MCP tools
- Made README version badge dynamic from package.json
- Enhanced test coverage with session management tests
- Improved CI/CD with informational patch coverage

### Documentation
- Added comprehensive N8N_DEPLOYMENT.md guide
- Updated CHANGELOG.md for version 2.9.0
- Enhanced CLAUDE.md with n8n-specific instructions
- Added deployment scripts and examples

## Technical Details

Files Added:
- Dockerfile.n8n, docker-compose.n8n.yml for n8n deployment
- Protocol version negotiation utilities
- n8n integration test suite
- Session management tests
- Deployment and test scripts
- Version badge update scripts

Files Modified:
- Enhanced MCP server with n8n mode support
- Improved HTTP server with better error handling
- Updated Docker configurations for security
- Enhanced logging for n8n compatibility
- CHANGELOG.md with comprehensive update description

This update makes n8n-mcp a first-class citizen in the n8n ecosystem,
enabling powerful AI-assisted workflow automation.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
czlonkowski
2025-08-02 00:01:01 +02:00
parent 0c81251fac
commit 6c7033bb45
9 changed files with 531 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
README.md
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@@ -2,7 +2,7 @@
[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
[![GitHub stars](https://img.shields.io/github/stars/czlonkowski/n8n-mcp?style=social)](https://github.com/czlonkowski/n8n-mcp)
[![Version](https://img.shields.io/badge/version-2.8.3-blue.svg)](https://github.com/czlonkowski/n8n-mcp)
[![Version](https://img.shields.io/badge/version-2.9.0-blue.svg)](https://github.com/czlonkowski/n8n-mcp)
[![npm version](https://img.shields.io/npm/v/n8n-mcp.svg)](https://www.npmjs.com/package/n8n-mcp)
[![codecov](https://codecov.io/gh/czlonkowski/n8n-mcp/graph/badge.svg?token=YOUR_TOKEN)](https://codecov.io/gh/czlonkowski/n8n-mcp)
[![Tests](https://img.shields.io/badge/tests-1356%20passing-brightgreen.svg)](https://github.com/czlonkowski/n8n-mcp/actions)
@@ -322,6 +322,14 @@ Deploy n8n-MCP to Railway's cloud platform with zero configuration:
**Restart Claude Desktop after updating configuration** - That's it! 🎉
## 🔧 n8n Integration
Want to use n8n-MCP with your n8n instance? Check out our comprehensive [n8n Deployment Guide](./docs/N8N_DEPLOYMENT.md) for:
- Local testing with the MCP Client Tool node
- Production deployment with Docker Compose
- Cloud deployment on Hetzner, AWS, and other providers
- Troubleshooting and security best practices
## 💻 Connect your IDE
n8n-MCP works with multiple AI-powered IDEs and tools. Choose your preferred development environment:

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@@ -5,6 +5,73 @@ All notable changes to this project will be documented in this file.
The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
## [2.9.0] - 2025-08-01
### Added
- **n8n Integration with MCP Client Tool Support**: Complete n8n integration enabling n8n-mcp to run as MCP server within n8n workflows
- Full compatibility with n8n's MCP Client Tool node
- Dedicated n8n mode (`N8N_MODE=true`) for optimized operation
- Workflow examples and n8n-friendly tool descriptions
- Quick deployment script (`deploy/quick-deploy-n8n.sh`) for easy setup
- Docker configuration specifically for n8n deployment (`Dockerfile.n8n`, `docker-compose.n8n.yml`)
- Test scripts for n8n integration (`test-n8n-integration.sh`, `test-n8n-mode.sh`)
- **n8n Deployment Documentation**: Comprehensive guide for deploying n8n-MCP with n8n (`docs/N8N_DEPLOYMENT.md`)
- Local testing instructions using `/scripts/test-n8n-mode.sh`
- Production deployment with Docker Compose
- Cloud deployment guide for Hetzner, AWS, and other providers
- n8n MCP Client Tool setup and configuration
- Troubleshooting section with common issues and solutions
- **Protocol Version Negotiation**: Intelligent client detection for n8n compatibility
- Automatically detects n8n clients and uses protocol version 2024-11-05
- Standard MCP clients get the latest version (2025-03-26)
- Improves compatibility with n8n's MCP Client Tool node
- Comprehensive protocol negotiation test suite
- **Comprehensive Parameter Validation**: Enhanced validation for all MCP tools
- Clear, user-friendly error messages for invalid parameters
- Numeric parameter conversion and edge case handling
- 52 new parameter validation tests
- Consistent error format across all tools
- **Session Management**: Improved session handling with comprehensive test coverage
- Fixed memory leak potential with async cleanup
- Better connection close handling
- Enhanced session management tests
- **Dynamic README Version Badge**: Made version badge update automatically from package.json
- Added `update-readme-version.js` script
- Enhanced `sync-runtime-version.js` to update README badges
- Version badge now stays in sync during publish workflow
### Fixed
- **Docker Build Optimization**: Fixed Dockerfile.n8n using wrong dependencies
- Now uses `package.runtime.json` instead of full `package.json`
- Reduces build time from 13+ minutes to 1-2 minutes
- Fixes ARM64 build failures due to network timeouts
- Reduces image size from ~1.5GB to ~280MB
- **CI Test Failures**: Resolved Docker entrypoint permission issues
- Updated tests to accept dynamic UID range (10000-59999)
- Enhanced lock file creation with better error recovery
- Fixed TypeScript lint errors in test files
- Fixed flaky performance tests with deterministic versions
- **Schema Validation Issues**: Fixed n8n nested output format compatibility
- Added validation for n8n's nested output workaround
- Fixed schema validation errors with n8n MCP Client Tool
- Enhanced error sanitization for production environments
### Changed
- **Memory Management**: Improved session cleanup to prevent memory leaks
- **Error Handling**: Enhanced error sanitization for production environments
- **Docker Security**: Using unpredictable UIDs/GIDs (10000-59999 range) for better security
- **CI/CD Configuration**: Made codecov patch coverage informational to prevent CI failures on infrastructure code
- **Test Scripts**: Enhanced with Docker auto-installation and better user experience
- Added colored output and progress indicators
- Automatic Docker installation for multiple operating systems
- n8n API key flow for management tools
### Security
- **Enhanced Docker Security**: Dynamic UID/GID generation for containers
- **Error Sanitization**: Improved error messages to prevent information leakage
- **Permission Handling**: Better permission management for mounted volumes
- **Input Validation**: Comprehensive parameter validation prevents injection attacks
## [2.8.3] - 2025-07-31
### Fixed

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# n8n-MCP Deployment Guide
This guide covers how to deploy n8n-MCP and connect it to your n8n instance. Whether you're testing locally or deploying to production, we'll show you how to set up n8n-MCP for use with n8n's MCP Client Tool node.
## Table of Contents
- [Overview](#overview)
- [Local Testing](#local-testing)
- [Production Deployment](#production-deployment)
- [Same Server as n8n](#same-server-as-n8n)
- [Different Server (Cloud Deployment)](#different-server-cloud-deployment)
- [Connecting n8n to n8n-MCP](#connecting-n8n-to-n8n-mcp)
- [Security & Best Practices](#security--best-practices)
- [Troubleshooting](#troubleshooting)
## Overview
n8n-MCP is a Model Context Protocol server that provides AI assistants with comprehensive access to n8n node documentation and management capabilities. When connected to n8n via the MCP Client Tool node, it enables:
- AI-powered workflow creation and validation
- Access to documentation for 500+ n8n nodes
- Workflow management through the n8n API
- Real-time configuration validation
## Local Testing
### Quick Test Script
Test n8n-MCP locally with the provided test script:
```bash
# Clone the repository
git clone https://github.com/czlonkowski/n8n-mcp.git
cd n8n-mcp
# Build the project
npm install
npm run build
# Run the test script
./scripts/test-n8n-mode.sh
```
This script will:
1. Start n8n-MCP in n8n mode on port 3001
2. Enable debug logging for troubleshooting
3. Run comprehensive protocol tests
4. Display results and any issues found
### Manual Local Setup
For development or custom testing:
1. **Prerequisites**:
- n8n instance running (local or remote)
- n8n API key (from n8n Settings → API)
2. **Start n8n-MCP**:
```bash
# Set environment variables
export N8N_MODE=true
export N8N_API_URL=http://localhost:5678 # Your n8n instance URL
export N8N_API_KEY=your-api-key-here # Your n8n API key
export MCP_AUTH_TOKEN=test-token-minimum-32-chars-long
export PORT=3001
# Start the server
npm start
```
3. **Verify it's running**:
```bash
# Check health
curl http://localhost:3001/health
# Check MCP protocol endpoint
curl http://localhost:3001/mcp
# Should return: {"protocolVersion":"2024-11-05"} for n8n compatibility
```
## Production Deployment
### Same Server as n8n
If you're running n8n-MCP on the same server as your n8n instance:
1. **Using Docker** (Recommended):
```bash
# Create a Docker network if n8n uses one
docker network create n8n-net
# Run n8n-MCP container
docker run -d \
--name n8n-mcp \
--network n8n-net \
-p 3000:3000 \
-e N8N_MODE=true \
-e N8N_API_URL=http://n8n:5678 \
-e N8N_API_KEY=your-n8n-api-key \
-e MCP_AUTH_TOKEN=$(openssl rand -hex 32) \
-e LOG_LEVEL=info \
--restart unless-stopped \
ghcr.io/czlonkowski/n8n-mcp:latest
```
2. **Using systemd** (for native installation):
```bash
# Create service file
sudo cat > /etc/systemd/system/n8n-mcp.service << EOF
[Unit]
Description=n8n-MCP Server
After=network.target
[Service]
Type=simple
User=nodejs
WorkingDirectory=/opt/n8n-mcp
Environment="N8N_MODE=true"
Environment="N8N_API_URL=http://localhost:5678"
Environment="N8N_API_KEY=your-n8n-api-key"
Environment="MCP_AUTH_TOKEN=your-secure-token"
Environment="PORT=3000"
ExecStart=/usr/bin/node /opt/n8n-mcp/dist/mcp/index.js
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF
# Enable and start
sudo systemctl enable n8n-mcp
sudo systemctl start n8n-mcp
```
### Different Server (Cloud Deployment)
Deploy n8n-MCP on a separate server from your n8n instance:
#### Quick Docker Deployment
```bash
# On your cloud server (Hetzner, AWS, DigitalOcean, etc.)
docker run -d \
--name n8n-mcp \
-p 3000:3000 \
-e N8N_MODE=true \
-e N8N_API_URL=https://your-n8n-instance.com \
-e N8N_API_KEY=your-n8n-api-key \
-e MCP_AUTH_TOKEN=$(openssl rand -hex 32) \
-e LOG_LEVEL=info \
--restart unless-stopped \
ghcr.io/czlonkowski/n8n-mcp:latest
# Save the MCP_AUTH_TOKEN for later use!
```
#### Full Production Setup (Hetzner/AWS/DigitalOcean)
1. **Server Requirements**:
- **Minimal**: 1 vCPU, 1GB RAM (CX11 on Hetzner)
- **Recommended**: 2 vCPU, 2GB RAM
- **OS**: Ubuntu 22.04 LTS
2. **Initial Setup**:
```bash
# SSH into your server
ssh root@your-server-ip
# Update and install Docker
apt update && apt upgrade -y
curl -fsSL https://get.docker.com | sh
```
3. **Deploy n8n-MCP with SSL** (using Caddy for automatic HTTPS):
```bash
# Create docker-compose.yml
cat > docker-compose.yml << 'EOF'
version: '3.8'
services:
n8n-mcp:
image: ghcr.io/czlonkowski/n8n-mcp:latest
container_name: n8n-mcp
restart: unless-stopped
environment:
- N8N_MODE=true
- N8N_API_URL=${N8N_API_URL}
- N8N_API_KEY=${N8N_API_KEY}
- MCP_AUTH_TOKEN=${MCP_AUTH_TOKEN}
- PORT=3000
- LOG_LEVEL=info
networks:
- web
caddy:
image: caddy:2-alpine
container_name: caddy
restart: unless-stopped
ports:
- "80:80"
- "443:443"
volumes:
- ./Caddyfile:/etc/caddy/Caddyfile
- caddy_data:/data
- caddy_config:/config
networks:
- web
networks:
web:
driver: bridge
volumes:
caddy_data:
caddy_config:
EOF
# Create Caddyfile
cat > Caddyfile << 'EOF'
mcp.yourdomain.com {
reverse_proxy n8n-mcp:3000
}
EOF
# Create .env file
cat > .env << EOF
N8N_API_URL=https://your-n8n-instance.com
N8N_API_KEY=your-n8n-api-key-here
MCP_AUTH_TOKEN=$(openssl rand -hex 32)
EOF
# Save the MCP_AUTH_TOKEN!
echo "Your MCP_AUTH_TOKEN is:"
grep MCP_AUTH_TOKEN .env
# Start services
docker compose up -d
```
#### Cloud Provider Tips
**AWS EC2**:
- Security Group: Open port 3000 (or 443 with HTTPS)
- Instance Type: t3.micro is sufficient
- Use Elastic IP for stable addressing
**DigitalOcean**:
- Droplet: Basic ($6/month) is enough
- Enable backups for production use
**Google Cloud**:
- Machine Type: e2-micro (free tier eligible)
- Use Cloud Load Balancer for SSL
## Connecting n8n to n8n-MCP
### Configure n8n MCP Client Tool
1. **In your n8n workflow**, add the **MCP Client Tool** node
2. **Configure the connection**:
```
Server URL:
- Same server: http://localhost:3000
- Docker network: http://n8n-mcp:3000
- Different server: https://mcp.yourdomain.com
Auth Token: [Your MCP_AUTH_TOKEN]
Transport: HTTP Streamable (SSE)
```
3. **Test the connection** by selecting a simple tool like `list_nodes`
### Available Tools
Once connected, you can use these MCP tools in n8n:
**Documentation Tools** (No API key required):
- `list_nodes` - List all n8n nodes with filtering
- `search_nodes` - Search nodes by keyword
- `get_node_info` - Get detailed node information
- `get_node_essentials` - Get only essential properties
- `validate_workflow` - Validate workflow configurations
- `get_node_documentation` - Get human-readable docs
**Management Tools** (Requires n8n API key):
- `n8n_create_workflow` - Create new workflows
- `n8n_update_workflow` - Update existing workflows
- `n8n_get_workflow` - Retrieve workflow details
- `n8n_list_workflows` - List all workflows
- `n8n_trigger_webhook_workflow` - Trigger webhook workflows
### Using with AI Agents
Connect n8n-MCP to AI Agent nodes for intelligent automation:
1. **Add an AI Agent node** (e.g., OpenAI, Anthropic)
2. **Connect MCP Client Tool** to the Agent's tool input
3. **Configure prompts** for workflow creation:
```
You are an n8n workflow expert. Use the MCP tools to:
1. Search for appropriate nodes using search_nodes
2. Get configuration details with get_node_essentials
3. Validate configurations with validate_workflow
4. Create the workflow if all validations pass
```
## Security & Best Practices
### Authentication
- **MCP_AUTH_TOKEN**: Always use a strong, random token (32+ characters)
- **N8N_API_KEY**: Only required for workflow management features
- Store tokens in environment variables or secure vaults
### Network Security
- **Use HTTPS** in production (Caddy/Nginx/Traefik)
- **Firewall**: Only expose necessary ports (3000 or 443)
- **IP Whitelisting**: Consider restricting access to known n8n instances
### Docker Security
- Run containers with `--read-only` flag if possible
- Use specific image versions instead of `:latest` in production
- Regular updates: `docker pull ghcr.io/czlonkowski/n8n-mcp:latest`
## Troubleshooting
### Connection Issues
**"Connection refused" in n8n MCP Client Tool**
- Check n8n-MCP is running: `docker ps` or `systemctl status n8n-mcp`
- Verify port is accessible: `curl http://your-server:3000/health`
- Check firewall rules allow port 3000
**"Invalid auth token"**
- Ensure MCP_AUTH_TOKEN matches exactly (no extra spaces)
- Token must be at least 32 characters long
- Check for special characters that might need escaping
**"Cannot connect to n8n API"**
- Verify N8N_API_URL is correct (include http:// or https://)
- Check n8n API key is valid and has necessary permissions
- Ensure n8n instance is accessible from n8n-MCP server
### Protocol Issues
**"Protocol version mismatch"**
- n8n-MCP automatically uses version 2024-11-05 for n8n
- Update to latest n8n-MCP version if issues persist
- Check `/mcp` endpoint returns correct version
**"Schema validation errors"**
- Known issue with n8n's nested output handling
- n8n-MCP includes workarounds
- Enable debug mode to see detailed errors
### Debugging
1. **Enable debug mode**:
```bash
docker run -d \
--name n8n-mcp \
-e DEBUG_MCP=true \
-e LOG_LEVEL=debug \
# ... other settings
```
2. **Check logs**:
```bash
# Docker
docker logs n8n-mcp -f --tail 100
# Systemd
journalctl -u n8n-mcp -f
```
3. **Test endpoints**:
```bash
# Health check
curl http://localhost:3000/health
# Protocol version
curl http://localhost:3000/mcp
# List tools (requires auth)
curl -X POST http://localhost:3000 \
-H "Authorization: Bearer YOUR_MCP_AUTH_TOKEN" \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"tools/list","id":1}'
```
## Performance Tips
- **Minimal deployment**: 1 vCPU, 1GB RAM is sufficient
- **Database**: Pre-built SQLite database (~15MB) loads quickly
- **Response time**: Average 12ms for queries
- **Caching**: Built-in 15-minute cache for repeated queries
## Next Steps
- Test your setup with the [MCP Client Tool in n8n](https://docs.n8n.io/integrations/builtin/app-nodes/n8n-nodes-langchain.mcpclienttool/)
- Explore [available MCP tools](../README.md#-available-mcp-tools)
- Build AI-powered workflows with [AI Agent nodes](https://docs.n8n.io/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.lmagent/)
- Join the [n8n Community](https://community.n8n.io) for ideas and support
---
Need help? Open an issue on [GitHub](https://github.com/czlonkowski/n8n-mcp/issues) or check the [n8n forums](https://community.n8n.io).

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@@ -1,6 +1,6 @@
{
"name": "n8n-mcp",
"version": "2.8.3",
"version": "2.9.0",
"description": "Integration between n8n workflow automation and Model Context Protocol (MCP)",
"main": "dist/index.js",
"bin": {
@@ -75,6 +75,7 @@
"db:init": "node -e \"new (require('./dist/services/sqlite-storage-service').SQLiteStorageService)(); console.log('Database initialized')\"",
"docs:rebuild": "ts-node src/scripts/rebuild-database.ts",
"sync:runtime-version": "node scripts/sync-runtime-version.js",
"update:readme-version": "node scripts/update-readme-version.js",
"prepare:publish": "./scripts/publish-npm.sh",
"update:all": "./scripts/update-and-publish-prep.sh"
},

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@@ -1,6 +1,6 @@
{
"name": "n8n-mcp-runtime",
"version": "2.8.3",
"version": "2.9.0",
"description": "n8n MCP Server Runtime Dependencies Only",
"private": true,
"dependencies": {

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@@ -1,8 +1,8 @@
#!/usr/bin/env node
/**
* Sync version from package.json to package.runtime.json
* This ensures both files always have the same version
* Sync version from package.json to package.runtime.json and README.md
* This ensures all files always have the same version
*/
const fs = require('fs');
@@ -10,6 +10,7 @@ const path = require('path');
const packageJsonPath = path.join(__dirname, '..', 'package.json');
const packageRuntimePath = path.join(__dirname, '..', 'package.runtime.json');
const readmePath = path.join(__dirname, '..', 'README.md');
try {
// Read package.json
@@ -34,6 +35,19 @@ try {
} else {
console.log(`✓ package.runtime.json already at version ${version}`);
}
// Update README.md version badge
let readmeContent = fs.readFileSync(readmePath, 'utf-8');
const versionBadgeRegex = /(\[!\[Version\]\(https:\/\/img\.shields\.io\/badge\/version-)[^-]+(-.+?\)\])/;
const newVersionBadge = `$1${version}$2`;
const updatedReadmeContent = readmeContent.replace(versionBadgeRegex, newVersionBadge);
if (updatedReadmeContent !== readmeContent) {
fs.writeFileSync(readmePath, updatedReadmeContent);
console.log(`✅ Updated README.md version badge to ${version}`);
} else {
console.log(`✓ README.md already has version badge ${version}`);
}
} catch (error) {
console.error('❌ Error syncing version:', error.message);
process.exit(1);

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@@ -90,15 +90,14 @@ npm version patch --no-git-tag-version
# Get new project version
NEW_PROJECT=$(node -e "console.log(require('./package.json').version)")
# 10. Update version badge in README
# 10. Update n8n version badge in README
echo ""
echo -e "${BLUE}📝 Updating README badges...${NC}"
sed -i.bak "s/version-[0-9.]*/version-$NEW_PROJECT/" README.md && rm README.md.bak
echo -e "${BLUE}📝 Updating n8n version badge...${NC}"
sed -i.bak "s/n8n-v[0-9.]*/n8n-$NEW_N8N/" README.md && rm README.md.bak
# 11. Sync runtime version
# 11. Sync runtime version (this also updates the version badge in README)
echo ""
echo -e "${BLUE}🔄 Syncing runtime version...${NC}"
echo -e "${BLUE}🔄 Syncing runtime version and updating version badge...${NC}"
npm run sync:runtime-version
# 12. Get update details for commit message

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@@ -0,0 +1,25 @@
#!/usr/bin/env node
const fs = require('fs');
const path = require('path');
// Read package.json
const packageJsonPath = path.join(__dirname, '..', 'package.json');
const packageJson = JSON.parse(fs.readFileSync(packageJsonPath, 'utf8'));
const version = packageJson.version;
// Read README.md
const readmePath = path.join(__dirname, '..', 'README.md');
let readmeContent = fs.readFileSync(readmePath, 'utf8');
// Update the version badge on line 5
// The pattern matches: [![Version](https://img.shields.io/badge/version-X.X.X-blue.svg)]
const versionBadgeRegex = /(\[!\[Version\]\(https:\/\/img\.shields\.io\/badge\/version-)[^-]+(-.+?\)\])/;
const newVersionBadge = `$1${version}$2`;
readmeContent = readmeContent.replace(versionBadgeRegex, newVersionBadge);
// Write back to README.md
fs.writeFileSync(readmePath, readmeContent);
console.log(`✅ Updated README.md version badge to v${version}`);