caldav-mcp

An MCP server that enables agents to read and write CalDAV calendars, including events, tasks, and journal entries. It supports recurring event expansion, tool filtering via environment variables, and destructive action elicitation for safety. It communicates over stdio to the client and WebDAV over HTTPS to the calendar server.

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

Community listingLocal stdioSource reviewed; not executedPublished by Willi Thiel

Vendor documentation

What you can do with it

List calendars and events
Create and update calendar events
Search for events and free/busy times
Manage tasks and journal entries

Source and maintenance

Community listingRegistry 0.1.5

mcp-registry: io.github.ni-c/caldav-mcp@0.1.5 Source repository Project website

Maintenance checked: Oct 31, 2026, 10:27 PM UTC

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

@ni-c/caldav-mcp 0.1.5

npm

@ni-c/caldav-mcp package definition

{
  "version": "0.1.5",
  "transport": "stdio",
  "identifier": "@ni-c/caldav-mcp",
  "registryType": "npm",
  "environmentVariables": [
    {
      "name": "CALDAV_URL",
      "format": "string",
      "isRequired": true,
      "description": "Root of the CalDAV server, e.g. https://dav.example.net. A calendar collection URL also works."
    },
    {
      "name": "CALDAV_USERNAME",
      "format": "string",
      "description": "Account name. Most hosted services want an app-specific password with it."
    },
    {
      "name": "CALDAV_PASSWORD",
      "format": "string",
      "description": "Password or app-specific password. Deleted from the environment once read."
    },
    {
      "name": "CALDAV_TOKEN",
      "format": "string",
      "description": "Bearer token, as an alternative to username and password. Not both."
    },
    {
      "name": "CALDAV_CALENDARS",
      "format": "string",
      "description": "Comma-separated calendars this server may touch, by path or final path segment. Default: all of them."
    },
    {
      "name": "CALDAV_TIMEZONE",
      "format": "string",
      "description": "IANA zone for timestamps that carry no offset, e.g. Europe/Berlin (default: UTC)"
    },
    {
      "name": "CALDAV_USER_EMAIL",
      "format": "string",
      "description": "The address you are invited as, so respond_to_event can find your own attendee line"
    },
    {
      "name": "CALDAV_MAX_EVENTS",
      "format": "number",
      "description": "Entries a listing returns by default, 1 to 500 (default: 100)"
    },
    {
      "name": "CALDAV_READ_ONLY",
      "format": "boolean",
      "description": "Set to true to register only the read tools (default: false)"
    },
    {
      "name": "CALDAV_INSECURE_TLS",
      "format": "boolean",
      "description": "Set to true to accept a self-signed certificate on the configured host only (default: false)"
    },
    {
      "name": "CALDAV_ALLOW_PLAINTEXT",
      "format": "boolean",
      "description": "Set to true to allow a plain http:// URL to a host that is not loopback, which sends the credentials unencrypted (default: false)"
    },
    {
      "name": "CALDAV_ALLOW_TOOLS",
      "format": "string",
      "description": "Comma-separated tool names or list_* prefixes to register; 'essential' selects a curated preset (default: all tools)"
    },
    {
      "name": "CALDAV_DENY_TOOLS",
      "format": "string",
      "description": "Comma-separated tool names or list_* prefixes to remove from whatever the allow list left"
    },
    {
      "name": "ELICITATION",
      "format": "boolean",
      "description": "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)"
    }
  ]
}

Tools

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No tool definitions available.

Connect from your client

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Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.

Cursor configuration

{
  "mcpServers": {
    "caldav-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@ni-c/caldav-mcp@0.1.5"
      ],
      "env": {
        "CALDAV_URL": "<YOUR_CALDAV_URL>",
        "CALDAV_USERNAME": "<YOUR_CALDAV_USERNAME>",
        "CALDAV_PASSWORD": "<YOUR_CALDAV_PASSWORD>",
        "CALDAV_TOKEN": "<YOUR_CALDAV_TOKEN>",
        "CALDAV_CALENDARS": "<YOUR_CALDAV_CALENDARS>",
        "CALDAV_TIMEZONE": "<YOUR_CALDAV_TIMEZONE>",
        "CALDAV_USER_EMAIL": "<YOUR_CALDAV_USER_EMAIL>",
        "CALDAV_MAX_EVENTS": "<YOUR_CALDAV_MAX_EVENTS>",
        "CALDAV_READ_ONLY": "<YOUR_CALDAV_READ_ONLY>",
        "CALDAV_INSECURE_TLS": "<YOUR_CALDAV_INSECURE_TLS>",
        "CALDAV_ALLOW_PLAINTEXT": "<YOUR_CALDAV_ALLOW_PLAINTEXT>",
        "CALDAV_ALLOW_TOOLS": "<YOUR_CALDAV_ALLOW_TOOLS>",
        "CALDAV_DENY_TOOLS": "<YOUR_CALDAV_DENY_TOOLS>",
        "ELICITATION": "<YOUR_ELICITATION>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.

Cline configuration

{
  "mcpServers": {
    "caldav-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@ni-c/caldav-mcp@0.1.5"
      ],
      "env": {
        "CALDAV_URL": "<YOUR_CALDAV_URL>",
        "CALDAV_USERNAME": "<YOUR_CALDAV_USERNAME>",
        "CALDAV_PASSWORD": "<YOUR_CALDAV_PASSWORD>",
        "CALDAV_TOKEN": "<YOUR_CALDAV_TOKEN>",
        "CALDAV_CALENDARS": "<YOUR_CALDAV_CALENDARS>",
        "CALDAV_TIMEZONE": "<YOUR_CALDAV_TIMEZONE>",
        "CALDAV_USER_EMAIL": "<YOUR_CALDAV_USER_EMAIL>",
        "CALDAV_MAX_EVENTS": "<YOUR_CALDAV_MAX_EVENTS>",
        "CALDAV_READ_ONLY": "<YOUR_CALDAV_READ_ONLY>",
        "CALDAV_INSECURE_TLS": "<YOUR_CALDAV_INSECURE_TLS>",
        "CALDAV_ALLOW_PLAINTEXT": "<YOUR_CALDAV_ALLOW_PLAINTEXT>",
        "CALDAV_ALLOW_TOOLS": "<YOUR_CALDAV_ALLOW_TOOLS>",
        "CALDAV_DENY_TOOLS": "<YOUR_CALDAV_DENY_TOOLS>",
        "ELICITATION": "<YOUR_ELICITATION>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.

VS Code configuration

{
  "servers": {
    "caldav-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@ni-c/caldav-mcp@0.1.5"
      ],
      "env": {
        "CALDAV_URL": "<YOUR_CALDAV_URL>",
        "CALDAV_USERNAME": "<YOUR_CALDAV_USERNAME>",
        "CALDAV_PASSWORD": "<YOUR_CALDAV_PASSWORD>",
        "CALDAV_TOKEN": "<YOUR_CALDAV_TOKEN>",
        "CALDAV_CALENDARS": "<YOUR_CALDAV_CALENDARS>",
        "CALDAV_TIMEZONE": "<YOUR_CALDAV_TIMEZONE>",
        "CALDAV_USER_EMAIL": "<YOUR_CALDAV_USER_EMAIL>",
        "CALDAV_MAX_EVENTS": "<YOUR_CALDAV_MAX_EVENTS>",
        "CALDAV_READ_ONLY": "<YOUR_CALDAV_READ_ONLY>",
        "CALDAV_INSECURE_TLS": "<YOUR_CALDAV_INSECURE_TLS>",
        "CALDAV_ALLOW_PLAINTEXT": "<YOUR_CALDAV_ALLOW_PLAINTEXT>",
        "CALDAV_ALLOW_TOOLS": "<YOUR_CALDAV_ALLOW_TOOLS>",
        "CALDAV_DENY_TOOLS": "<YOUR_CALDAV_DENY_TOOLS>",
        "ELICITATION": "<YOUR_ELICITATION>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.

Claude Desktop configuration

{
  "mcpServers": {
    "caldav-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@ni-c/caldav-mcp@0.1.5"
      ],
      "env": {
        "CALDAV_URL": "<YOUR_CALDAV_URL>",
        "CALDAV_USERNAME": "<YOUR_CALDAV_USERNAME>",
        "CALDAV_PASSWORD": "<YOUR_CALDAV_PASSWORD>",
        "CALDAV_TOKEN": "<YOUR_CALDAV_TOKEN>",
        "CALDAV_CALENDARS": "<YOUR_CALDAV_CALENDARS>",
        "CALDAV_TIMEZONE": "<YOUR_CALDAV_TIMEZONE>",
        "CALDAV_USER_EMAIL": "<YOUR_CALDAV_USER_EMAIL>",
        "CALDAV_MAX_EVENTS": "<YOUR_CALDAV_MAX_EVENTS>",
        "CALDAV_READ_ONLY": "<YOUR_CALDAV_READ_ONLY>",
        "CALDAV_INSECURE_TLS": "<YOUR_CALDAV_INSECURE_TLS>",
        "CALDAV_ALLOW_PLAINTEXT": "<YOUR_CALDAV_ALLOW_PLAINTEXT>",
        "CALDAV_ALLOW_TOOLS": "<YOUR_CALDAV_ALLOW_TOOLS>",
        "CALDAV_DENY_TOOLS": "<YOUR_CALDAV_DENY_TOOLS>",
        "ELICITATION": "<YOUR_ELICITATION>"
      }
    }
  }
}

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