Openworkdays MCP Server

by solvohq Your server? Claim it

answering

Openworkdays is answering right now. Last checked 6 min ago. It exposes 1 tools. Last commit 17 May 2026.

Zero-signup business-day date-math API: add days, count days between dates, is-business-day.

Uptime history 48 days of history · worst day 82%

48 days agonow

81.5%

Uptime 24h

75 of 92 checks

Tools

read from the server

366 ms

Response time

average over 24h

Stars

last commit 17 May 2026

Openworkdays does not always answer

Over the last week it answered 97.3% 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 6 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add openworkdays --transport http https://openworkdays.vercel.app/api/mcp

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

{
  "mcpServers": {
    "openworkdays": {
      "url": "https://openworkdays.vercel.app/api/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.openworkdays]
url = "https://openworkdays.vercel.app/api/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "openworkdays": {
      "url": "https://openworkdays.vercel.app/api/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "openworkdays": {
      "url": "https://openworkdays.vercel.app/api/mcp"
    }
  }
}

Available tools 1

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

businessdays

businessdays

Business-day date math. Three modes inferred from params: add (start+days -> the date N business days away, negative days = before), diff (start+end -> count of business days between, inclusive of both endpoints), is (date -> is it a business day). Optional weekend (default sat,sun) and holidays (comma list of YYYY-MM-DD you supply). No signup, no API key. Pure UTC date-only math; no time-of-day/DST/timezone.

Endpoints

URL	Transport	State	Latency	Checked
https://openworkdays.vercel.app/api/mcp	streamable-http	answering	598 ms	6 min ago

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Openworkdays — questions

Answers built from our own checks of this server.

What can Openworkdays do?

It exposes 1 tools, read directly from the server on our last check. Among them: businessdays. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Openworkdays working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 75 of 92 checks got a reply (81.5%), average response time 366 ms. The bar chart above shows every period we have measured.

How do I connect Openworkdays?

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.

Does Openworkdays need an API key?

No. Openworkdays completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 1 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Openworkdays?

It answers our handshake in 366 ms on average, which is faster than 42% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Openworkdays open source?

Yes — it is published under the MIT licence, written in JavaScript and 0 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.