CaldavCAUTION
🗓️ A CalDAV Model Context Protocol (MCP) server to expose calendar operations as tools for AI assistants.
Overview
From the repository's own README, as read at the audited commit. Badges and raw HTML are left out.
🗓️ A CalDAV Model Context Protocol (MCP) server to expose calendar operations as tools for AI assistants.
[](https://github.com/dominik1001/caldav-mcp/actions/workflows/release.yml) [](https://www.npmjs.com/package/caldav-mcp) [](https://choosealicense.com/licenses/mit/) [](https://github.com/prettier/prettier) [](https://modelcontextprotocol.io) [](https://github.com/semantic-release/semantic-release)
✨ Features
- Connect to CalDAV servers
- List calendars
- List calendar events within a specific timeframe
- Create calendar events
- Update calendar events
- Delete calendar events by UID
Setup
{
"mcpServers": {
...,
"calendar": {
"command": "npx",
"args": [
"caldav-mcp"
],
"env": {
"CALDAV_BASE_URL": "",
"CALDAV_USERNAME": "",
"CALDAV_PASSWORD": ""
}
}
}
}Development
Quick Start
Run the MCP server in development mode with auto-reload:
npm run dev
This will run the TypeScript code directly with watch mode and automatically load environment variables from .env.
Manual Build
Alternatively, you can compile TypeScript to JavaScript and run it:
- Compile:
npx tsc
- Run:
node dist/index.js
Available Tools
list-calendars
List all calendars returning both name and
109e066dee51OBSERVED · 2026-10-07Connect
Built from this server's own package name, version and transport as found in its source — not copied from anyone's documentation, so it cannot drift against a page we do not control. Replace the environment placeholders with a token scoped to the least it needs.
claude mcp add caldav-mcp --env CALDAV_PASSWORD=${CALDAV_PASSWORD} -- npx -y [email protected]Exposed tools (10)
3 read · 5 write · 2 destructive. Blast radius: 2 tools can delete or overwrite — an agent that can be talked into calling a tool can be talked into calling this one.
| Tool | Risk | Description |
|---|---|---|
complete-todo | read | Marks a task (VTODO) as done. Sets its status to COMPLETED and records the completion time. |
create-event | write | Creates an event in the calendar specified by its URL. For all-day events, set |
create-todo | write | Creates a task (VTODO) in the calendar specified by its URL. Only |
delete-event | destructive | Deletes an event in the calendar specified by its URL |
delete-todo | destructive | Deletes a task (VTODO) in the calendar specified by its URL |
list-calendars | read | List all calendars returning both name and URL |
list-events | write | List all events between start and end date in the calendar specified by its URL |
list-todos | read | List tasks (VTODOs) in the calendar specified by its URL. By default returns only open tasks (NEEDS-ACTION and IN-PROCESS), sorted by manual order then due date. Use |
update-event | write | Updates an existing event in the calendar specified by its URL. Only provided fields are changed. For a one-day full-day event, set |
update-todo | write | Updates an existing task (VTODO) in the calendar specified by its URL. Only provided fields are changed. To mark a task done, prefer the |
Trust audit
CAUTIONgrade B · trust 89/100 Install with care. The audit found things worth knowing before you trust its output.
| Layer | What it checks | Result |
|---|---|---|
| L0 | Provenance & inventory | WARN |
| L1 | Static analysis of the code | PASS |
| L2 | Instruction surface (what it tells the agent) | PASS |
| L3 | Class-specific surface | WARN |
| L4 | Behavioural (sandbox) | SKIPPED |
What the source does
- Filesystem
- declared (1 observation(s))
- Network
- none-observed
- Shell
- none-observed
- Dependencies
- not all pinned
- Secrets in source
- none-found
Findings (10)
.claude/skills/review-agents-md
delete-event, delete-todo
.releaserc.json
CLAUDE.md
curl -fsS -u test:test http://127.0.0.1:5232/ >/dev/null && exit 0
http://127.0.0.1:5232/test/default/
CALDAV_BASE_URL=http://127.0.0.1:5232
@modelcontextprotocol/sdk, ts-caldav, zod, @biomejs/biome, @commitlint/cli, @commitlint/config-conventional, @semantic-release/changelog, @semantic-release/git
This will run the TypeScript code directly with watch mode and automatically load environment variables from `.env`.
read from environment variables. Never commit your `.env` file or hard-code
Gates applied: no_behavioural_pass.
109e066dee51full audit observations/trust-audit/mcp-server/dominik1001__caldav.json · Report an issue / request a re-scanAudit history
Every audit this server has had. A grade with a past is a grade somebody is still checking.
| Date | Source | Verdict | Grade | Score | Change |
|---|---|---|---|---|---|
| 2026-10-07 | 109e066dee51 | CAUTION | B | 89 | first audit |
Questions
What is the Caldav MCP server?
🗓️ A CalDAV Model Context Protocol (MCP) server to expose calendar operations as tools for AI assistants.
What tools does Caldav expose?
10 in total: 3 read-only, 5 that write, and 2 that can delete or overwrite (delete-event, delete-todo). Every one is listed on this page with its risk.
Is Caldav safe to connect to an agent?
With care. The audit graded it B (89/100) and found 10 things worth knowing before you trust this server, listed below with the exact line each was found on. Separately from the audit: 2 of its tools can destroy data, so scope the token you give it to what you actually need.
What credentials does Caldav need?
It reads CALDAV_PASSWORD from the environment. Give it a token scoped to the least it needs — an agent that can be talked into calling a tool can be talked into calling it with your credentials.
How does Caldav run?
It speaks stdio, so it runs as a local process your client starts. It is published on npm as caldav-mcp at 0.10.0.
How current is this page?
The grade is for one exact copy of the source (109e066dee51), read on 2026-10-07. The repository is watched and re-audited when it changes.