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Astrocal MCP Server

answering

Astrocal is answering right now. Last checked 8 min ago. 82 installs a week from npm. Last commit 12 Aug 2026.

AI-native scheduling: check availability, book meetings, cancel and reschedule via MCP

Installs per day peak 24 · avg 14 · +27% w/w
a month agotoday
Uptime history 47 days of history
47 days agonow
100.0%
Uptime 24h
92 of 92 checks
Tools
hidden behind auth
172 ms
Response time
average over 24h
82
Installs / week
npm and PyPI

Nothing serious here today

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

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 8 min ago.

run in your terminal
claude mcp add mcp-server --transport http https://api.astrocal.dev/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "mcp-server": {
      "url": "https://api.astrocal.dev/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.mcp-server]
url = "https://api.astrocal.dev/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "mcp-server": {
      "url": "https://api.astrocal.dev/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "mcp-server": {
      "url": "https://api.astrocal.dev/mcp"
    }
  }
}

This one needs environment variables set before it will start: ASTROCAL_API_KEY (Your Astrocal API key (create one at https://astrocal.dev/dashboard/connect)), ASTROCAL_API_URL (Custom API base URL (defaults to https://api.astrocal.dev)), ASTROCAL_DEFAULT_EVENT_TYPE_ID (Default event type ID when not specified in tool calls). The author declared them in the registry entry; get the values from the project itself.

This endpoint answered with an authorization challenge. The server is running, and it signs you in through your browser: there is no API key to paste.

Endpoints

URLTransportStateLatencyChecked
https://api.astrocal.dev/mcp streamable-http sign-in 173 ms 8 min ago

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Astrocal — questions

Answers built from our own checks of this server.

Why is there no tool list for Astrocal?
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 Astrocal working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 172 ms. The bar chart above shows every period we have measured.
How do I connect Astrocal?
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 Astrocal?
No API key is involved. Astrocal 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 Astrocal?
It answers our handshake in 172 ms on average, which is faster than 72% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.
How many people use Astrocal?
The npm package @astrocal/mcp-server was installed 82 times in the last week. Week over week that is +27%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is Astrocal open source?
Yes — it is published under the MIT licence, written in TypeScript and 1 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.