Connect OpenClaw

In OpenClaw you add Kalender Sync as a remote MCP server. Optionally you also add our skill so the agent knows how to work with your calendars.

1. Create the access and key in Kalender Sync

No account yet? Create one at app.kalender-sync.de (7 days of Professional free, no credit card) and connect your calendars.

In the app, open AI assistant → Connect the assistant and choose Something else. As with every access, you pick the calendars one by one and set the detail level per calendar — calendars you don’t share don’t exist for OpenClaw.

Create key gives you your access key (a token starting with ksa_). It is shown only once. Treat it like a password: whoever holds the key holds exactly the access you gave this connection. Never paste it into a chat.

Why a key and not a sign-in window?

Sign-in through a browser window (OAuth) is currently available for Claude and ChatGPT only. OpenClaw therefore connects with an access key. Your permissions work exactly the same: you still decide per calendar what is visible and whether events may be created.

2. Add Kalender Sync in OpenClaw

Store the key as the environment variable KALENDER_SYNC_KEY and add the server. The single quotes make OpenClaw resolve ${KALENDER_SYNC_KEY} itself, so the key doesn’t end up in the configuration:

export KALENDER_SYNC_KEY="ksa_…"
openclaw mcp set kalender-sync '{"url":"https://app.kalender-sync.de/mcp","transport":"streamable-http","headers":{"Authorization":"Bearer ${KALENDER_SYNC_KEY}"}}'

Ideally set KALENDER_SYNC_KEY permanently in your shell profile rather than only in the current session.

3. Optional: install the skill

The skill tells the agent how to use Kalender Sync (call list_calendars first, pass on warnings, write only to writable calendars). Run in your OpenClaw workspace:

mkdir -p skills/kalender-sync
curl --fail --silent --show-error \
  'https://kalender-sync.de/skills/kalender-sync/SKILL.md' \
  --output skills/kalender-sync/SKILL.md

Then ask OpenClaw to use the kalender-sync skill.

Then dive right in, e.g.: “Which calendars are shared via Kalender Sync?”, “Where do I have two hours in one block this week?” or “When is my dentist appointment?”

Revoke access

In Kalender Sync under AI assistant, click Revoke on the access — effective immediately; the key is dead regardless of what is stored in OpenClaw. More under Revoke access.