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Kalender Sync

Official registry Productivity

EU-hosted calendar MCP: Google, Outlook, iCloud, GMX, WEB.DE, CalDAV. Read, book, RSVP, sync.

Website

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http kalender-sync 'https://app.kalender-sync.de/mcp' --header 'Authorization: <Not needed for Claude and ChatGPT, which sign in via OAuth. All other clients: create an access key in the Kalender Sync app under AI assistant → Connect assistant → Something else → Create key, and send it as '\''Bearer ksa_…'\''.>'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "kalender-sync": {
            "type": "http",
            "url": "https://app.kalender-sync.de/mcp",
            "headers": {
                "Authorization": "<Not needed for Claude and ChatGPT, which sign in via OAuth. All other clients: create an access key in the Kalender Sync app under AI assistant → Connect assistant → Something else → Create key, and send it as 'Bearer ksa_…'.>"
            }
        }
    }
}

Frequently asked questions

What is Kalender Sync?

EU-hosted calendar MCP: Google, Outlook, iCloud, GMX, WEB.DE, CalDAV. Read, book, RSVP, sync.

How do I install Kalender Sync?

It runs as a remote server. In Claude Code: claude mcp add --transport http kalender-sync 'https://app.kalender-sync.de/mcp' --header 'Authorization: <Not needed for Claude and ChatGPT, which sign in via OAuth. All other clients: create an access key in the Kalender Sync app under AI assistant → Connect assistant → Something else → Create key, and send it as '\''Bearer ksa_…'\''.>'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Kalender Sync need an API key?

Yes. It expects Authorization, which you set in its configuration.

Who maintains Kalender Sync?

It is published by de.kalender-sync. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.