Callendar is listed as active in the registry but did not answer our last check. It exposes 4 tools.
WhatsApp® reminders and rescheduling for Calendly. Public read-only MCP endpoint.
Callendar does not always answer
Over the last week it answered 0.0% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.
Connect this server
Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 11 min ago.
claude mcp add mcp --transport http https://app.callendar.de/mcphttps://app.callendar.de/mcp[mcp_servers.mcp]
url = "https://app.callendar.de/mcp"{
"mcpServers": {
"mcp": {
"url": "https://app.callendar.de/mcp"
}
}
}{
"servers": {
"mcp": {
"type": "http",
"url": "https://app.callendar.de/mcp"
}
}
}Available tools 4
Read directly from the server with tools/list, grouped by what they act on.
If a tool disappears, we record the date.
create_callendar_contact_link
get_callendar_features
get_callendar_overview
get_callendar_pricing
Endpoints
| URL | Transport | State | Latency | Checked |
|---|---|---|---|---|
| https://app.callendar.de/mcp | streamable-http | answering | 1608 ms | 11 min ago |
Alternatives to Callendar
same job, measured the same wayRead-only WhatsApp MCP for your AI agent: it reads the chats you choose. Try the public demo.
MCP server for Microsoft Graph: Outlook mail and calendar, plus read-only Microsoft Teams
Hosted WhatsApp MCP for Claude and ChatGPT: read chats, find who awaits a reply.
WhatsApp MCP on your own number: read chats, send and schedule messages.
Schedule real phone-call reminders with WhatsApp follow-up — medication, wake-ups, family check-ins.
Schedule reminders for AI agents via email, webhook, Slack, Discord, Telegram, or Google Calendar.
Your own WhatsApp as an MCP server: read, search and send from any MCP client.
Find when public events happen and get email reminders before them, following moved matches.
Callendar — questions
Answers built from our own checks of this server.