Read and write CalDAV calendars: events, tasks and journal entries over the open standard
To add CalDAV calendars to Claude, run the install command below or copy the ready-made config for Claude Code, Claude Desktop, Cursor and VS Code further down. Restart your client after adding it and its tools show up in your next conversation. It needs 14 environment variables, listed below.
Install
npx -y @ni-c/caldav-mcp@0.1.5Environment variables
CALDAV_URLSet in your MCP configCALDAV_USERNAMESet in your MCP configCALDAV_PASSWORDSet in your MCP configCALDAV_TOKENSet in your MCP configCALDAV_CALENDARSSet in your MCP configCALDAV_TIMEZONESet in your MCP configCALDAV_USER_EMAILSet in your MCP configCALDAV_MAX_EVENTSSet in your MCP configCALDAV_READ_ONLYSet in your MCP configCALDAV_INSECURE_TLSSet in your MCP configCALDAV_ALLOW_PLAINTEXTSet in your MCP configCALDAV_ALLOW_TOOLSSet in your MCP configCALDAV_DENY_TOOLSSet in your MCP configELICITATIONSet in your MCP configInstall with your client
claude mcp add caldav-calendars --env CALDAV_URL=<YOUR_CALDAV_URL> --env CALDAV_USERNAME=<YOUR_CALDAV_USERNAME> --env CALDAV_PASSWORD=<YOUR_CALDAV_PASSWORD> --env CALDAV_TOKEN=<YOUR_CALDAV_TOKEN> --env CALDAV_CALENDARS=<YOUR_CALDAV_CALENDARS> --env CALDAV_TIMEZONE=<YOUR_CALDAV_TIMEZONE> --env CALDAV_USER_EMAIL=<YOUR_CALDAV_USER_EMAIL> --env CALDAV_MAX_EVENTS=<YOUR_CALDAV_MAX_EVENTS> --env CALDAV_READ_ONLY=<YOUR_CALDAV_READ_ONLY> --env CALDAV_INSECURE_TLS=<YOUR_CALDAV_INSECURE_TLS> --env CALDAV_ALLOW_PLAINTEXT=<YOUR_CALDAV_ALLOW_PLAINTEXT> --env CALDAV_ALLOW_TOOLS=<YOUR_CALDAV_ALLOW_TOOLS> --env CALDAV_DENY_TOOLS=<YOUR_CALDAV_DENY_TOOLS> --env ELICITATION=<YOUR_ELICITATION> -- npx -y @ni-c/caldav-mcp@0.1.5
Run this in a terminal to add the server to Claude Code.
What this does
CalDAV calendars exposes a set of tools to Claude over the Model Context Protocol. After you add it to claude_desktop_config.json (snippet above) and restart Claude Desktop, those tools become callable inside any conversation.
Requirements
This server needs the following environment variables to be set before it can run:
CALDAV_URL CALDAV_USERNAME CALDAV_PASSWORD CALDAV_TOKEN CALDAV_CALENDARS CALDAV_TIMEZONE CALDAV_USER_EMAIL CALDAV_MAX_EVENTS CALDAV_READ_ONLY CALDAV_INSECURE_TLS CALDAV_ALLOW_PLAINTEXT CALDAV_ALLOW_TOOLS CALDAV_DENY_TOOLS ELICITATION
Set these via the env object in your MCP config (see claude_desktop_config.json snippet above).
Frequently asked questions
How do I install CalDAV calendars?
Run the Claude Code command in the install section to add CalDAV calendars to Claude Code, or copy the ready-made config for your client from the install section on this page. Restart your client afterwards and the tools appear in your next conversation.
Which clients work with CalDAV calendars?
This page carries setup and config for Claude Code, Claude Desktop, Cursor and VS Code. Any other MCP client that accepts a standard server config can connect to CalDAV calendars as well.
Does CalDAV calendars need an API key?
Yes. Before it can run, set these environment variables: CALDAV_URL, CALDAV_USERNAME, CALDAV_PASSWORD, CALDAV_TOKEN, CALDAV_CALENDARS, CALDAV_TIMEZONE, CALDAV_USER_EMAIL, CALDAV_MAX_EVENTS, CALDAV_READ_ONLY, CALDAV_INSECURE_TLS, CALDAV_ALLOW_PLAINTEXT, CALDAV_ALLOW_TOOLS, CALDAV_DENY_TOOLS, ELICITATION. They go in the env block of your MCP config.
Imported from the Official MCP Registry. The details above come from the registry entry; the maker can claim this listing to correct them, add docs, and see its traffic.
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