caldav-mcp

An MCP server for CalDAV calendars that allows agents to read and write events, tasks, and journal entries. It handles recurring event expansion locally to ensure consistent behavior across different CalDAV servers, manages time zones explicitly, and supports tool filtering via environment variables. It operates over stdio for local clients or via mcp-hub for web-based clients.

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

Checks and signals

Each line is separate evidence, not a trust score.

Popularity 1 GitHub star

What you can do with it

Read calendar events and tasks
Create and modify calendar entries
Find free time slots
Expand recurring events into individual occurrences

Source and maintenance

Community listingRegistry 0.1.5MIT

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

Last repository push: Nov 2, 2026, 11:05 AM UTC
Latest release: v0.1.5
Maintenance checked: Nov 2, 2026, 3:20 PM UTC

Packages and installation

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

ghcr.io/ni-c/caldav-mcp:0.1.5

oci

ghcr.io/ni-c/caldav-mcp:0.1.5 package definition

{
  "transport": "stdio",
  "identifier": "ghcr.io/ni-c/caldav-mcp:0.1.5",
  "registryType": "oci",
  "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

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

Nov 2, 2026, 3:20 PM UTC · repository · passed · metadata changed · updated
Nov 2, 2026, 3:20 PM UTC · backfill · recorded · Pre-expansion baseline; unobserved rich metadata remains unknown

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

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-0-1-5": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "CALDAV_URL=<YOUR_CALDAV_URL>",
        "-e",
        "CALDAV_USERNAME=<YOUR_CALDAV_USERNAME>",
        "-e",
        "CALDAV_PASSWORD=<YOUR_CALDAV_PASSWORD>",
        "-e",
        "CALDAV_TOKEN=<YOUR_CALDAV_TOKEN>",
        "-e",
        "CALDAV_CALENDARS=<YOUR_CALDAV_CALENDARS>",
        "-e",
        "CALDAV_TIMEZONE=<YOUR_CALDAV_TIMEZONE>",
        "-e",
        "CALDAV_USER_EMAIL=<YOUR_CALDAV_USER_EMAIL>",
        "-e",
        "CALDAV_MAX_EVENTS=<YOUR_CALDAV_MAX_EVENTS>",
        "-e",
        "CALDAV_READ_ONLY=<YOUR_CALDAV_READ_ONLY>",
        "-e",
        "CALDAV_INSECURE_TLS=<YOUR_CALDAV_INSECURE_TLS>",
        "-e",
        "CALDAV_ALLOW_PLAINTEXT=<YOUR_CALDAV_ALLOW_PLAINTEXT>",
        "-e",
        "CALDAV_ALLOW_TOOLS=<YOUR_CALDAV_ALLOW_TOOLS>",
        "-e",
        "CALDAV_DENY_TOOLS=<YOUR_CALDAV_DENY_TOOLS>",
        "-e",
        "ELICITATION=<YOUR_ELICITATION>",
        "ghcr.io/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-0-1-5": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "CALDAV_URL=<YOUR_CALDAV_URL>",
        "-e",
        "CALDAV_USERNAME=<YOUR_CALDAV_USERNAME>",
        "-e",
        "CALDAV_PASSWORD=<YOUR_CALDAV_PASSWORD>",
        "-e",
        "CALDAV_TOKEN=<YOUR_CALDAV_TOKEN>",
        "-e",
        "CALDAV_CALENDARS=<YOUR_CALDAV_CALENDARS>",
        "-e",
        "CALDAV_TIMEZONE=<YOUR_CALDAV_TIMEZONE>",
        "-e",
        "CALDAV_USER_EMAIL=<YOUR_CALDAV_USER_EMAIL>",
        "-e",
        "CALDAV_MAX_EVENTS=<YOUR_CALDAV_MAX_EVENTS>",
        "-e",
        "CALDAV_READ_ONLY=<YOUR_CALDAV_READ_ONLY>",
        "-e",
        "CALDAV_INSECURE_TLS=<YOUR_CALDAV_INSECURE_TLS>",
        "-e",
        "CALDAV_ALLOW_PLAINTEXT=<YOUR_CALDAV_ALLOW_PLAINTEXT>",
        "-e",
        "CALDAV_ALLOW_TOOLS=<YOUR_CALDAV_ALLOW_TOOLS>",
        "-e",
        "CALDAV_DENY_TOOLS=<YOUR_CALDAV_DENY_TOOLS>",
        "-e",
        "ELICITATION=<YOUR_ELICITATION>",
        "ghcr.io/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-0-1-5": {
      "type": "stdio",
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "CALDAV_URL=<YOUR_CALDAV_URL>",
        "-e",
        "CALDAV_USERNAME=<YOUR_CALDAV_USERNAME>",
        "-e",
        "CALDAV_PASSWORD=<YOUR_CALDAV_PASSWORD>",
        "-e",
        "CALDAV_TOKEN=<YOUR_CALDAV_TOKEN>",
        "-e",
        "CALDAV_CALENDARS=<YOUR_CALDAV_CALENDARS>",
        "-e",
        "CALDAV_TIMEZONE=<YOUR_CALDAV_TIMEZONE>",
        "-e",
        "CALDAV_USER_EMAIL=<YOUR_CALDAV_USER_EMAIL>",
        "-e",
        "CALDAV_MAX_EVENTS=<YOUR_CALDAV_MAX_EVENTS>",
        "-e",
        "CALDAV_READ_ONLY=<YOUR_CALDAV_READ_ONLY>",
        "-e",
        "CALDAV_INSECURE_TLS=<YOUR_CALDAV_INSECURE_TLS>",
        "-e",
        "CALDAV_ALLOW_PLAINTEXT=<YOUR_CALDAV_ALLOW_PLAINTEXT>",
        "-e",
        "CALDAV_ALLOW_TOOLS=<YOUR_CALDAV_ALLOW_TOOLS>",
        "-e",
        "CALDAV_DENY_TOOLS=<YOUR_CALDAV_DENY_TOOLS>",
        "-e",
        "ELICITATION=<YOUR_ELICITATION>",
        "ghcr.io/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-0-1-5": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "CALDAV_URL=<YOUR_CALDAV_URL>",
        "-e",
        "CALDAV_USERNAME=<YOUR_CALDAV_USERNAME>",
        "-e",
        "CALDAV_PASSWORD=<YOUR_CALDAV_PASSWORD>",
        "-e",
        "CALDAV_TOKEN=<YOUR_CALDAV_TOKEN>",
        "-e",
        "CALDAV_CALENDARS=<YOUR_CALDAV_CALENDARS>",
        "-e",
        "CALDAV_TIMEZONE=<YOUR_CALDAV_TIMEZONE>",
        "-e",
        "CALDAV_USER_EMAIL=<YOUR_CALDAV_USER_EMAIL>",
        "-e",
        "CALDAV_MAX_EVENTS=<YOUR_CALDAV_MAX_EVENTS>",
        "-e",
        "CALDAV_READ_ONLY=<YOUR_CALDAV_READ_ONLY>",
        "-e",
        "CALDAV_INSECURE_TLS=<YOUR_CALDAV_INSECURE_TLS>",
        "-e",
        "CALDAV_ALLOW_PLAINTEXT=<YOUR_CALDAV_ALLOW_PLAINTEXT>",
        "-e",
        "CALDAV_ALLOW_TOOLS=<YOUR_CALDAV_ALLOW_TOOLS>",
        "-e",
        "CALDAV_DENY_TOOLS=<YOUR_CALDAV_DENY_TOOLS>",
        "-e",
        "ELICITATION=<YOUR_ELICITATION>",
        "ghcr.io/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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