CalDAV calendars runs on your own machine — the client starts it, so there is no endpoint to ping. 138 installs a week from npm. Last commit 24 Oct 2026.
Read and write CalDAV calendars: events, tasks and journal entries over the open standard
Nothing serious here today
Today is the operative word: we check CalDAV calendars every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.
Connect this server
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add caldav-mcp -e 'CALDAV_URL=<CALDAV_URL>' -- npx -y @ni-c/caldav-mcp{
"mcpServers": {
"caldav-mcp": {
"command": "npx",
"args": [
"-y",
"@ni-c/caldav-mcp"
],
"env": {
"CALDAV_URL": "<CALDAV_URL>"
}
}
}
}[mcp_servers.caldav-mcp]
command = "npx"
args = ["-y", "@ni-c/caldav-mcp"]
env = { CALDAV_URL = "<CALDAV_URL>" }{
"mcpServers": {
"caldav-mcp": {
"command": "npx",
"args": [
"-y",
"@ni-c/caldav-mcp"
],
"env": {
"CALDAV_URL": "<CALDAV_URL>"
}
}
}
}{
"servers": {
"caldav-mcp": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@ni-c/caldav-mcp"
],
"env": {
"CALDAV_URL": "<CALDAV_URL>"
}
}
}
}Put your own value in place of
<CALDAV_URL> (Root of the CalDAV server, e.g. https://dav.example.net. A calendar collection URL also works).
The author’s registry entry marks it as required.
Optional settings from the registry entry, left out of the block above:
CALDAV_USERNAME (Account name. Most hosted services want an app-specific password with it), CALDAV_PASSWORD (Password or app-specific password. Deleted from the environment once read), CALDAV_TOKEN (Bearer token, as an alternative to username and password. Not both), CALDAV_CALENDARS (Comma-separated calendars this server may touch, by path or final path segment. Default: all of them), CALDAV_TIMEZONE (IANA zone for timestamps that carry no offset, e.g. Europe/Berlin (default: UTC)), CALDAV_USER_EMAIL (The address you are invited as, so respond_to_event can find your own attendee line), CALDAV_MAX_EVENTS (Entries a listing returns by default, 1 to 500 (default: 100)), CALDAV_READ_ONLY (Set to true to register only the read tools (default: false)), CALDAV_INSECURE_TLS (Set to true to accept a self-signed certificate on the configured host only (default: false)), CALDAV_ALLOW_PLAINTEXT (Set to true to allow a plain http:// URL to a host that is not loopback, which sends the credentials unencrypted (default: false)), CALDAV_ALLOW_TOOLS (Comma-separated tool names or list_* prefixes to register; 'essential' selects a curated preset (default: all tools)), CALDAV_DENY_TOOLS (Comma-separated tool names or list_* prefixes to remove from whatever the allow list left), ELICITATION (Deliberately unprefixed, and reaches every MCP server in the environment. Set to false to make guarded tools use the two-call token instead of a dialog (default: true)).
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CalDAV calendars — questions
Answers built from our own checks of this server.