Calensync MCP Server

by calensync Your server? Claim it

answering

Calensync is answering right now. Last checked 5 min ago.

Manage Google, Outlook & Apple calendars and create private sync rules from chat.

Uptime history 16 hours of history

16 hours agonow

100.0%

Uptime 24h

59 of 59 checks

—

Tools

hidden behind auth

713 ms

Response time

average over 24h

OAuth sign-in

Access

streamable-http

Nothing serious here today

Today is the operative word: we check Calensync every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 5 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add calensync --transport http https://api.calensync.live/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "calensync": {
      "url": "https://api.calensync.live/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.calensync]
url = "https://api.calensync.live/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "calensync": {
      "url": "https://api.calensync.live/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "calensync": {
      "url": "https://api.calensync.live/mcp"
    }
  }
}

This endpoint answered with an authorization challenge — the server is running, but you need an API key or OAuth to use it.

Endpoints

URL	Transport	State	Latency	Checked
https://api.calensync.live/mcp	streamable-http	needs key	574 ms	5 min ago

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Calensync — questions

Answers built from our own checks of this server.

Why is there no tool list for Calensync?

The server answered our handshake with an authorization challenge, so it is running — but it will not describe its tools to an anonymous client. To see them you need to connect with your own credentials. We record it as alive, not as broken: 100.0% of checks in the last 24 hours got a reply.

Is Calensync working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 59 of 59 checks got a reply (100.0%), average response time 713 ms. The bar chart above shows every period we have measured.

How do I connect Calensync?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address. You sign in through your browser once and the client keeps the session: no key to copy, and it refuses anonymous clients.

How do you sign in to Calensync?

No API key is involved. Calensync answers our knock with an OAuth challenge, so you authorise it once in your browser and the client keeps the session. That is also why we see no tool list: it will not describe itself to an anonymous client, and that is the server working as intended, not a fault.

How fast is Calensync?

It answers our handshake in 713 ms on average, which is faster than 18% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.