# Reported issues for caldav-mcp

Pod holds 9 of 9 problems reported by people outside the maintainer team. Issues filed by the project's own owners, members and collaborators are excluded entirely — a maintainer's release checklist is not a warning to a prospective user.

Back to [caldav-mcp](/mcp/caldav-mcp).

## Most discussed

### Second update-event on the same event fails with HTTP 412

Reporting rather than fixing, since the cause looks like it sits in `ts-caldav` rather than here, and I have not pinned it down far enough to propose a patch.

## What happens

The second `update-event` on the same event fails, reliably:

```
create-event  → ok
update-event  (change only the location) → ok
update-event  (change only the summary)  → Error: Event with the specified uid does not match.
```

A freshly created event can then be updated exactly once again, so it tracks the event, not 

[Read the thread](https://github.com/dominik1001/caldav-mcp/issues/96) · 2026-08-16 · open · external user · 1 comment

### [BUG] wholeDay events are stored one day early for timezones ahead of UTC (UTC date truncation after Date conversion)

## Summary

When creating (or updating) an all-day event with `wholeDay: true` and passing local-midnight ISO datetimes with a positive UTC offset (e.g. Asia/Seoul, `+09:00`), the event is stored on the **previous calendar day** on the server. The tool description says "For a single-day all-day event, use `start` and `end` datetimes on the same calendar date", which is exactly what triggers it.

## Environment

- caldav-mcp 0.10.0 (latest), bundled ts-caldav 0.3.7 — the same code is present in t

[Read the thread](https://github.com/dominik1001/caldav-mcp/issues/89) · 2026-07-23 · open · external user · 0 comments

### create-event and list-events missing description and location fields (present in update-event)

## Bug / Feature Request

Two tools have incomplete field coverage compared to \`update-event\`:

### 1. \`create-event\` — cannot set description or location at creation time

\`create-event\` only accepts: \`summary\`, \`start\`, \`end\`, \`calendarUrl\`, \`recurrenceRule\`.
The only workaround is a two-step call: \`create-event\` then immediately \`update-event\`.

### 2. \`list-events\` — silently drops description and location from results

\`list-events\` fetches full event objects but map

[Read the thread](https://github.com/dominik1001/caldav-mcp/issues/48) · 2026-04-27 · closed · external user · 3 comments

### Ontheia listed as compatible client — works great with caldav-mcp

> Hi,
>
> We've been testing your MCP server with [Ontheia](https://ontheia.ai) — a self-hosted, open-source AI agent platform — and it works great out of the box.
>
> We've added it to our [Compatible MCP Servers](https://docs.ontheia.ai/getting-started/03_compatible-mcp-servers/) page to help our users discover it.
>
> If you'd like to list Ontheia as a compatible client in your README, we'd be happy about that — but no obligation at all.
>
> Thanks for building this!
> — Wolfgang, founder of 

[Read the thread](https://github.com/dominik1001/caldav-mcp/issues/47) · 2026-04-21 · closed · external user · 1 comment

### Possibility of CardDAV

Hello Dominik, 

Love to see a calendar connector MCP server that supports a proper open standard (vs existing e.g. Google Calendar specific ones).

I'd also like to wire up my address book. Since CalDAV and CardDAV are closely related, I was wondering if you could see such code living in this repo? I'd also be open to submitting PRs, but have to honestly admit that due to time constraints it would mostly be vibe coded.

Happy to hear your thoughts.
David

[Read the thread](https://github.com/dominik1001/caldav-mcp/issues/38) · 2026-03-02 · closed · external user · 2 comments

### Issue: end parameter required but causes inconsistent -32602 validation errors when omitted; recommend making it optional

Summary: The list-events tool's end parameter is required by the Zod schema, but when an LLM caller omits it (passing null), the MCP gateway sometimes strips the null silently (returning []) and sometimes passes it through (triggering a -32602 validation error). Making end optional with a sensible default would eliminate the inconsistency and make the tool significantly more ergonomic for multi-calendar workflows.

Observed behaviour
When calling list-events with end: null — which LLMs naturally

[Read the thread](https://github.com/dominik1001/caldav-mcp/issues/33) · 2026-02-23 · closed · external user · 2 comments

### [BUG] No events found in nextcloud calenders

Hi there,

Just tried this MCP Server and it does connect to my Nextcloud instance after correcting the path from `/remote.php/dav` to `/remote.php/undefined` 
However it only discovers my calender but it cannot fetch any events from there. Neither add new events to a calender.
Do you have an Idea what is going on? How can i debug this issue?

Cheers!

[Read the thread](https://github.com/dominik1001/caldav-mcp/issues/9) · 2026-01-06 · closed · external user · 3 comments

### [FEATURE] Support skipping certificate validation

Hey! Could support for skipping certificate validation be added please? I am personally just using local IP addresses for connecting to CalDAV and am just using self-signed certificates since it's just my own internal infrastructure. I suspect a lot of people hosting MCP servers are doing something similar.

<details><summary>Logs for context</summary>
<pre><code>2025-08-02 14:02:32,263 - INFO - Initiating connection for server: 'calendar'...
npm warn exec The following package was not found an

[Read the thread](https://github.com/dominik1001/caldav-mcp/issues/5) · 2025-08-02 · open · external user · 3 comments

## Most recent

### list-events: 'end' parameter is unnecessarily required

# `list-events`: `end` parameter is unnecessarily required

## Summary

The `end` parameter in the `list-events` tool's `inputSchema` is defined as required, but the underlying `ts-caldav` library's `getEvents` treats `end` as optional. This prevents AI models from querying events without specifying `end`, and when `null` or `undefined` is passed, it causes unpredictable behavior.

> **Disclaimer**: I'm not a developer, so the technical analysis below may not be entirely accurate. I investigated

[Read the thread](https://github.com/dominik1001/caldav-mcp/issues/34) · 2026-03-01 · closed · external user · 0 comments

The remaining reports are on [the project's issue tracker](https://github.com/dominik1001/caldav-mcp/issues).