# Workday Calendar (remote · workday-calendar.regnotes.workers.dev)

Public holidays and business-day math (T+N, counts) for many countries; pay per call via x402

- Trust score: 72/100 (medium)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `workday-calendar.regnotes.workers.dev`: 72/100 (this document), [markdown](https://verifymcp.io/servers/dev-workers-regnotes-workday-calendar-workday-calendar/workday-calendar.md), [page](https://verifymcp.io/servers/dev-workers-regnotes-workday-calendar-workday-calendar/workday-calendar)

## Channel facts

- Endpoint: `https://workday-calendar.regnotes.workers.dev/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 74/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 456 tokens (~114/item across 4 items; 4 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 37/100
  - Stability observed for 11 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Workday Calendar MCP server?

Workday Calendar is a hosted endpoint at https://workday-calendar.regnotes.workers.dev/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http dev-workers-regnotes-workday-calendar-workday-ca 'https://workday-calendar.regnotes.workers.dev/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "dev-workers-regnotes-workday-calendar-workday-ca": {
      "url": "https://workday-calendar.regnotes.workers.dev/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "dev-workers-regnotes-workday-calendar-workday-ca": {
      "type": "http",
      "url": "https://workday-calendar.regnotes.workers.dev/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.dev-workers-regnotes-workday-calendar-workday-ca]
url = "https://workday-calendar.regnotes.workers.dev/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "dev-workers-regnotes-workday-calendar-workday-ca": {
      "type": "remote",
      "url": "https://workday-calendar.regnotes.workers.dev/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add dev-workers-regnotes-workday-calendar-workday-ca --url 'https://workday-calendar.regnotes.workers.dev/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  dev-workers-regnotes-workday-calendar-workday-ca:
    url: "https://workday-calendar.regnotes.workers.dev/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "dev-workers-regnotes-workday-calendar-workday-ca": {
      "Transport": "http",
      "Url": "https://workday-calendar.regnotes.workers.dev/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add dev-workers-regnotes-workday-calendar-workday-ca -t streamable-http -u 'https://workday-calendar.regnotes.workers.dev/mcp'
```

### Other

```json
{
  "mcpServers": {
    "dev-workers-regnotes-workday-calendar-workday-ca": {
      "type": "http",
      "url": "https://workday-calendar.regnotes.workers.dev/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-05 (score 72, +1)

No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-03 (score 71, +1)

No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-01 (score 70, +1)

- [security] Tool “business_day” rewrote its description, which is the text the model reads
- [security] Tool “business_days_add” rewrote its description, which is the text the model reads
- [security] Tool “business_days_count” rewrote its description, which is the text the model reads
- [security] Tool “holidays” rewrote its description, which is the text the model reads
- [functional regression] Schema quality: 87 → 114

### 2026-10-30 (score 69, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-28 (score 68, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-26 (score 67, +1)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-25 (score 66)

First indexed and scored.

## MCP tools (4)

### `business_day` (~98 tokens)

Whether a date is a business day in a country (holiday/weekend/make-up workday aware), plus the previous and next business day. Price: $0.001 USDC per request (fixed; one paid HTTP GET = one charge; x402 exact on Base or MPP on Tempo; 4xx errors are not charged).

Input parameters:

- `country` (string, required): ISO alpha-2
- `date` (string, required): YYYY-MM-DD

### `business_days_add` (~118 tokens)

Date that is N business days after (or before, if negative) a start date in a country. Typical use: T+2 settlement, SLA and filing deadlines. Price: $0.002 USDC per request (fixed; one paid HTTP GET = one charge; x402 exact on Base or MPP on Tempo; 4xx errors are not charged).

Input parameters:

- `country` (string, required): ISO alpha-2
- `date` (string, required): Start date YYYY-MM-DD
- `days` (integer, required): Integer -260..260

### `business_days_count` (~105 tokens)

Number of business days in [start, end] inclusive (max 3 years), with the holidays that fell on weekdays. Price: $0.002 USDC per request (fixed; one paid HTTP GET = one charge; x402 exact on Base or MPP on Tempo; 4xx errors are not charged).

Input parameters:

- `country` (string, required): ISO alpha-2
- `end` (string, required): YYYY-MM-DD
- `start` (string, required): YYYY-MM-DD

### `holidays` (~87 tokens)

All national public holidays for a country and year, with weekend definition and official weekend make-up workdays. Price: $0.002 USDC per request (fixed; one paid HTTP GET = one charge; x402 exact on Base or MPP on Tempo; 4xx errors are not charged).

Input parameters:

- `country` (string, required): ISO alpha-2
- `year` (integer, required): YYYY

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/dev-workers-regnotes-workday-calendar-workday-calendar/workday-calendar#diagnostics

## Score history

- 2026-11-05: 72
- 2026-11-04: 71
- 2026-11-03: 71
- 2026-11-02: 70
- 2026-11-01: 70
- 2026-10-31: 69
- 2026-10-30: 69
- 2026-10-29: 68
- 2026-10-28: 68
- 2026-10-27: 67
- 2026-10-26: 67
- 2026-10-25: 66

## Common questions

### What is the Workday Calendar MCP server?

Workday Calendar is an MCP server listed in the public MCP registry as dev.workers.regnotes.workday-calendar/workday-calendar. Public holidays and business-day math (T+N, counts) for many countries; pay per call via x402. This page covers its hosted endpoint (https://workday-calendar.regnotes.workers.dev/mcp).

### Is the Workday Calendar MCP server safe to use?

Workday Calendar scores 72 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Workday Calendar MCP server expose?

Workday Calendar exposes 4 tools: business_day, business_days_add, business_days_count, holidays. Their descriptions and schemas cost roughly 408 tokens of context every time the server is loaded.

### Does the Workday Calendar MCP server require authentication?

No. We connected to Workday Calendar without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Workday Calendar MCP server still maintained?

Workday Calendar is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://workday-calendar.regnotes.workers.dev/mcp
- Website: https://workday-calendar.regnotes.workers.dev/
- Changelog RSS feed: https://verifymcp.io/servers/dev-workers-regnotes-workday-calendar-workday-calendar/workday-calendar.xml
- Changelog JSON feed: https://verifymcp.io/servers/dev-workers-regnotes-workday-calendar-workday-calendar/workday-calendar.json
- HTML version of this page: https://verifymcp.io/servers/dev-workers-regnotes-workday-calendar-workday-calendar/workday-calendar