io.github.PhilflowIO/dav-mcp MCP Server

dav-mcp

Give your AI agents the power of organization — Transform them into orchestrating assistants managing calendars, contacts, and tasks.

Built on 26 production-ready tools spanning CalDAV, CardDAV, and VTODO protocols.

---

Quick Start

Claude Desktop / Cursor (Local)

Add to your MCP config file:

{
  "mcpServers": {
    "dav-mcp": {
      "command": "npx",
      "args": ["-y", "dav-mcp"],
      "env": {
        "CALDAV_SERVER_URL": "https://dav.example.com",
        "CALDAV_USERNAME": "your_username",
        "CALDAV_PASSWORD": "your_password"
      }
    }
  }
}

Config file locations:

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

Restart Claude Desktop after adding the configuration.

---

n8n (Remote HTTP)

Start the HTTP server:

CALDAV_SERVER_URL=https://dav.example.com \
CALDAV_USERNAME=your_username \
CALDAV_PASSWORD=your_password \
BEARER_TOKEN=your-secret-token \
npx dav-mcp --http

Then in n8n:

1. Add AI Agent node
2. Add MCP Client Tool node and connect to AI Agent
3. Configure:
   • MCP Endpoint: http://localhost:3000/mcp
   • Authentication: Bearer
   • Token: your-secret-token

Custom port:

npx dav-mcp --http --port=8080

---

Docker

Pull the published image (distroless, runs as non-root, no shell):

docker run -d --name dav-mcp -p 3000:3000 --env-file .env \
  ghcr.io/philflowio/dav-mcp:latest

Tags: latest, the exact release (4.0.0) and the minor line (4.0). Set PORT to serve on a different port; the healthcheck follows it.

Or build from source:

git clone https://github.com/PhilflowIO/dav-mcp.git
cd dav-mcp
cp .env.example .env
# Edit .env with your credentials
docker-compose up

---

The Orchestration

When partial tools force your AI to improvise, complete tools let it execute precise operations across all components.

Capability	dav-mcp	Most MCPs
Calendar Management	Full CRUD (12 tools)	Create + list only (2-3 tools)
Contact Management	Complete CardDAV (8 tools)	Often missing entirely
Task Management	Full VTODO support (7 tools)	Rarely included
Field-Based Updates	All RFC properties + custom fields	Rarely available
Free/Busy	Works on every server (client-side)	Native REPORT, unsupported by most
Server-Side Filtering	Efficient queries	Dumps all data
Multi-Provider	Any CalDAV/CardDAV server	Limited provider support
Total Tools	27 tools	2-6 tools

---

Available Tools (27 Total)

CalDAV Tools (12 tools)

1. list_calendars - List all available calendars
2. list_events - List ALL events (use calendar_query for filtered searches)
3. create_event - Create a new calendar event
4. update_event - PREFERRED: Update any event field (SUMMARY, LOCATION, STATUS, custom X-* properties); move or convert an event with start_date/end_date/all_day
5. update_event_raw - Update event with raw iCal data (advanced)
6. delete_event - Delete an event permanently
7. calendar_query - PREFERRED: Search and filter events efficiently by text, date range, or location
8. make_calendar - Create a new calendar collection
9. update_calendar - Update calendar properties (display name, description, color, timezone)
10. delete_calendar - Permanently delete a calendar and all its events
11. calendar_multi_get - Batch fetch multiple specific events by URLs
12. freebusy_query - Find free and busy time in a range ("when am I free?"), calculated client-side

CardDAV Tools (8 tools)

12. list_addressbooks - List all available address books
13. list_contacts - List ALL contacts (use addressbook_query for filtered searches)
14. create_contact - Create a new contact (vCard)
15. update_contact - PREFERRED: Update any contact field (FN, EMAIL, TEL, ORG, ADR, custom X-* properties)
16. update_contact_raw - Update contact with raw vCard data (advanced)
17. delete_contact - Delete a contact permanently
18. addressbook_query - PREFERRED: Search and filter contacts efficiently by name, email, or organization
19. addressbook_multi_get - Batch fetch multiple specific contacts by URLs

VTODO Tools (7 tools)

20. list_todos - List ALL todos/tasks (use todo_query for filtered searches)
21. create_todo - Create a new todo/task with optional due date, priority, status
22. update_todo - PREFERRED: Update any todo field (SUMMARY, STATUS, PRIORITY, DUE, PERCENT-COMPLETE, custom X-* properties)
23. update_todo_raw - Update todo with raw VTODO iCal data (advanced)
24. delete_todo - Delete a todo/task permanently
25. todo_query - PREFERRED: Search and filter todos efficiently by status/due date
26. todo_multi_get - Batch fetch multiple specific todos by URLs

---

Real-World Applications

n8n Automation Workflows

• Meeting Management: "Show me all Friday meetings" → calendar_query with date filter returns only relevant events
• Contact Search: "Find everyone at Google" → addressbook_query with org filter finds matches efficiently
• Task Reporting: "Show overdue high-priority tasks" → todo_query with filters returns specific results
• Scheduled Cleanup: Daily cron job deletes completed tasks using targeted queries

Claude Desktop Integration

• Quick Event Creation: "Create team meeting tomorrow 2 PM" → create_event executes immediately
• Contact Lookup: "What's Sarah's email?" → addressbook_query with name filter finds contact
• Calendar Overview: "What's on my calendar next week?" → calendar_query with date range shows events
• Calendar Management: "Create a new calendar called Project Luna" → make_calendar creates collection

---

Works Across All Major Providers

Works with any CalDAV/CardDAV server that follows RFC 4791 and RFC 6352:

• Nextcloud - Full support
• Baikal - Full support
• Radicale - Full support
• iCloud - Works with app-specific password
• Any RFC-compliant server - Standard protocol support

---

Google Calendar (OAuth2)

For Google Calendar, use OAuth2 authentication:

{
  "mcpServers": {
    "dav-mcp": {
      "command": "npx",
      "args": ["-y", "dav-mcp"],
      "env": {
        "AUTH_METHOD": "OAuth",
        "GOOGLE_USER": "your@gmail.com",
        "GOOGLE_CLIENT_ID": "your-client-id",
        "GOOGLE_CLIENT_SECRET": "your-client-secret",
        "GOOGLE_REFRESH_TOKEN": "your-refresh-token"
      }
    }
  }
}

---

Security

• Input Validation: All inputs validated with Zod schemas before execution
• Rate Limiting: 100 requests/minute per session (HTTP mode)
• Bearer Auth: Token authentication for HTTP transport
• No Credential Storage: Pass-through only, never logged or cached
• Structured Logging: Audit trail with request IDs, no PII exposure
• CORS Protection: Whitelist origins, block cross-site attacks

---

Documentation

• MCP Specification - Model Context Protocol docs
• tsdav Docs - CalDAV/CardDAV library reference
• CalDAV RFC 4791 - CalDAV protocol specification
• CardDAV RFC 6352 - CardDAV protocol specification

---

Contributing

Pull requests are welcome! Please read CONTRIBUTING.md for guidelines.

---

License

MIT License - see LICENSE for details

---

Acknowledgments

Built with:

• tsdav - Excellent TypeScript CalDAV/CardDAV library
• tsdav-utils - Field-agnostic utility layer for RFC-compliant field updates
• MCP SDK - Model Context Protocol by Anthropic
• ical.js - RFC-compliant iCalendar parser

---

Questions? Issues? Create a GitHub issue

---

Built for AI agents managing calendars, contacts, and tasks