CalDAV
An MCP server that exposes CalDAV calendar operations as tools for AI assistants. It enables users to connect to CalDAV servers to create and list calendar events within specific timeframes.
What is CalDAV?
CalDAV is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to mcp server that exposes caldav calendar operations as tools for ai assistants. it enables users to connect to caldav servers to create and list calendar events within specific timeframes.
An MCP server that exposes CalDAV calendar operations as tools for AI assistants. It enables users to connect to CalDAV servers to create and list calendar events within specific timeframes.
This server falls under the Communication category on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- An MCP server that exposes CalDAV calendar operations as too
Use Cases
Maintainer
Works with
Installation
NPM
npx -y caldavManual Installation
npx -y caldavConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use CalDAV
The CalDAV MCP server exposes CalDAV calendar operations as tools for AI assistants, enabling them to list calendars, create and update events, list events within date ranges, and delete events on any CalDAV-compatible server. It works with self-hosted solutions like Nextcloud, Baikal, and Radicale, as well as hosted services that expose a CalDAV endpoint, giving users natural-language control over their calendar from any MCP client.
Prerequisites
- Node.js 18 or later installed
- A CalDAV server URL (e.g. Nextcloud, iCloud, Baikal, Radicale, or any CalDAV provider)
- CalDAV username and password credentials
- An MCP-compatible client such as Claude Desktop or Claude Code
Locate your CalDAV server URL
Find the CalDAV base URL for your calendar provider. For Nextcloud it is typically https://your-nextcloud.example.com/remote.php/dav. For iCloud it is https://caldav.icloud.com. Your hosting provider's documentation will have the exact URL.
Configure your MCP client
Add the caldav-mcp server to your MCP client configuration with the three required environment variables: CALDAV_BASE_URL, CALDAV_USERNAME, and CALDAV_PASSWORD.
{
"mcpServers": {
"caldav": {
"command": "npx",
"args": ["-y", "caldav"],
"env": {
"CALDAV_BASE_URL": "https://your-caldav-server.example.com",
"CALDAV_USERNAME": "your_username",
"CALDAV_PASSWORD": "your_password"
}
}
}
}Restart your MCP client
Restart Claude Desktop or reload your MCP client to load the CalDAV server with your credentials.
List your calendars
Ask your AI assistant to list your calendars. The list-calendars tool returns all available calendars with their names and URLs, which you can reference for subsequent event operations.
Create or retrieve events
Use natural language to create events with summaries, date/time, location, description, and recurrence rules, or list events within a specific date range using ISO 8601 format dates.
CalDAV Examples
Client configuration
Complete claude_desktop_config.json entry for the CalDAV MCP server with required environment variables.
{
"mcpServers": {
"caldav": {
"command": "npx",
"args": ["-y", "caldav"],
"env": {
"CALDAV_BASE_URL": "https://your-caldav-server.example.com",
"CALDAV_USERNAME": "your_username",
"CALDAV_PASSWORD": "your_password"
}
}
}
}Prompts to try
Example prompts to use once the CalDAV MCP server is connected to your AI assistant.
- "List all my calendars"
- "Show me all events from June 1 to June 30, 2026"
- "Create a team meeting event on June 20 at 2 PM titled 'Sprint Review'"
- "Add a recurring weekly standup every Monday at 9 AM"
- "Delete the event with UID abc123 from my work calendar"Troubleshooting CalDAV
Authentication failed connecting to CalDAV server
Double-check CALDAV_USERNAME and CALDAV_PASSWORD. Some providers (like iCloud) require an app-specific password rather than your main account password. Generate an app-specific password in your account security settings.
No calendars returned from list-calendars
Verify the CALDAV_BASE_URL is the correct CalDAV principal or home-set URL, not just the general server URL. For Nextcloud, ensure the URL includes /remote.php/dav/principals/users/your_username/ or the correct dav path.
Event creation succeeds but events do not appear in calendar app
CalDAV clients may cache calendar data. Force a sync in your calendar app. Also ensure the calendar URL used in create-event matches a URL returned by list-calendars for your writable calendar.
Frequently Asked Questions about CalDAV
What is CalDAV?
CalDAV is a Model Context Protocol (MCP) server that mcp server that exposes caldav calendar operations as tools for ai assistants. it enables users to connect to caldav servers to create and list calendar events within specific timeframes. It connects AI assistants to external tools and data sources through a standardized interface.
How do I install CalDAV?
Install via npm with the command: npx -y caldav. Then add the server configuration to your AI client's JSON config file (e.g., claude_desktop_config.json or .cursor/mcp.json).
Which AI clients work with CalDAV?
CalDAV works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is CalDAV free to use?
Yes, CalDAV is open source and available under the MIT License license. You can use it freely in both personal and commercial projects.
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Quick Config Preview
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