# WorkdayAPI (remote · workdayapi.mike-tusa.workers.dev)

Business-day and public-holiday math for 29 countries: add business days, days between, holidays.

- Trust score: 73/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-24

## Components

- remote · `workdayapi.mike-tusa.workers.dev`: 73/100 (this document), [markdown](https://verifymcp.io/servers/dev-workers-mike-tusa-workdayapi-workdayapi/workdayapi.md), [page](https://verifymcp.io/servers/dev-workers-mike-tusa-workdayapi-workdayapi/workdayapi)

## Channel facts

- Endpoint: `https://workdayapi.mike-tusa.workers.dev/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.2.0`

## 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 2026-10-24.

- **Endpoint Security**: 69/100
  - 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.
  - The HSTS (Strict-Transport-Security) header is present.
  - 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**: 64/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 1104 tokens (~220/item across 5 items; 5 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 40/100
  - Stability observed for 12 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.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 5 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 6 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### How do I install the WorkdayAPI MCP server?

WorkdayAPI is a hosted endpoint at https://workdayapi.mike-tusa.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-mike-tusa-workdayapi-workdayapi 'https://workdayapi.mike-tusa.workers.dev/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "dev-workers-mike-tusa-workdayapi-workdayapi": {
      "url": "https://workdayapi.mike-tusa.workers.dev/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "dev-workers-mike-tusa-workdayapi-workdayapi": {
      "type": "http",
      "url": "https://workdayapi.mike-tusa.workers.dev/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.dev-workers-mike-tusa-workdayapi-workdayapi]
url = "https://workdayapi.mike-tusa.workers.dev/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "dev-workers-mike-tusa-workdayapi-workdayapi": {
      "type": "remote",
      "url": "https://workdayapi.mike-tusa.workers.dev/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add dev-workers-mike-tusa-workdayapi-workdayapi --url 'https://workdayapi.mike-tusa.workers.dev/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  dev-workers-mike-tusa-workdayapi-workdayapi:
    url: "https://workdayapi.mike-tusa.workers.dev/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "dev-workers-mike-tusa-workdayapi-workdayapi": {
      "Transport": "http",
      "Url": "https://workdayapi.mike-tusa.workers.dev/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add dev-workers-mike-tusa-workdayapi-workdayapi -t streamable-http -u 'https://workdayapi.mike-tusa.workers.dev/mcp'
```

### Other

```json
{
  "mcpServers": {
    "dev-workers-mike-tusa-workdayapi-workdayapi": {
      "type": "http",
      "url": "https://workdayapi.mike-tusa.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.

### 2026-10-24 (score 73, +1)

No change was recorded against any check on this day. Stability & Change Management went from 37 to 40. That category is still filling its 30-day observation window: 11 days of observed history at the previous scan, 12 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-22 (score 72, +1)

No change was recorded against any check on this day. Stability & Change Management went from 30 to 33. That category is still filling its 30-day observation window: 9 days of observed history at the previous scan, 10 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-20 (score 71, +1)

No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-19 (score 70, 0)

- [functional] Server version: 0.2.1 → 0.2.2

### 2026-10-17 (score 70, +1)

- [functional] Server version: 0.2.0 → 0.2.1

### 2026-10-15 (score 69, +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.

### 2026-10-13 (score 68, +1)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-12 (score 67)

First indexed and scored.

## MCP tools (5)

### `get_holidays` (~171 tokens)

List public holidays for a country and year

List the public (and optionally bank/observance) holidays for one country (and region) in one year, 2020-2035, with local names, types and official source links. Read-only. Same data, cache and limits as GET /v1/holidays.

Input parameters:

- `country` (string, required): ISO 3166-1 alpha-2 country code, e.g. US, DE, GB. See list_countries.
- `region` (string): Optional region/state code for countries with regional holidays, e.g. DE-BY, US-CA (or just BY).
- `types` (string): Optional comma list of public, bank, observance, or "all" (default: all).
- `year` (integer, required): Year, 2020-2035.

Output parameters:

- `count` (integer)
- `country` (string)
- `country_name` (string)
- `data_version` (string)
- `holidays` (array)
- `notes` (string)
- `region` (string)
- `region_name` (string)
- `scope` (string)
- `sources` (array)
- `year` (integer)

### `is_business_day` (~216 tokens)

Check whether a date is a business day

Check whether a date is a business day in a country (and region), considering weekends and public holidays. Returns the reason (weekend or holiday name) plus the previous and next business days. Read-only. Same engine, cache and limits as GET /v1/is-business-day.

Input parameters:

- `country` (string, required): ISO 3166-1 alpha-2 country code, e.g. US, DE, GB. See list_countries.
- `date` (string, required): Date to check, YYYY-MM-DD (2020-2035).
- `region` (string): Optional region/state code for countries with regional holidays, e.g. DE-BY, US-CA (or just BY).
- `types` (string): Optional holiday types that close business days: comma list of public, bank (default: public; "all" = public,bank).
- `weekend` (string): Optional weekend days, comma list of day names like "sat,sun" (default) or "fri,sat", or "none".

Output parameters:

- `business_day` (boolean)
- `country` (string)
- `date` (string)
- `holiday` (object)
- `holiday_types` (array)
- `next_business_day` (string)
- `previous_business_day` (string)
- `reason` (string)
- `region` (string)
- `weekday` (string)
- `weekend` (string)

### `add_business_days` (~227 tokens)

Add or subtract business days from a date

Add (or, with a negative number, subtract) business days to a date, skipping weekends and public holidays of the country (and region). Returns the result date and the holidays skipped. Read-only. Same engine, cache and limits as GET /v1/add.

Input parameters:

- `country` (string, required): ISO 3166-1 alpha-2 country code, e.g. US, DE, GB. See list_countries.
- `date` (string, required): Start date, YYYY-MM-DD (2020-2035).
- `days` (integer, required): Business days to add; negative counts backwards.
- `region` (string): Optional region/state code for countries with regional holidays, e.g. DE-BY, US-CA (or just BY).
- `types` (string): Optional holiday types that close business days: comma list of public, bank (default: public; "all" = public,bank).
- `weekend` (string): Optional weekend days, comma list of day names like "sat,sun" (default) or "fri,sat", or "none".

Output parameters:

- `calendar_days` (integer)
- `country` (string)
- `date` (string)
- `days` (integer)
- `holiday_types` (array)
- `region` (string)
- `result` (string)
- `result_weekday` (string)
- `skipped_holidays` (array)
- `skipped_holidays_truncated` (boolean)
- `weekend` (string)

### `business_days_between` (~253 tokens)

Count business days between two dates

Count business days between two dates in a country (and region), excluding weekends and public holidays. The end date is excluded unless inclusive is true. Returns business, weekend and holiday day counts and the holidays in the range. Read-only. Same engine, cache and limits as GET /v1/between.

Input parameters:

- `country` (string, required): ISO 3166-1 alpha-2 country code, e.g. US, DE, GB. See list_countries.
- `from` (string, required): Start date, YYYY-MM-DD (2020-2035).
- `inclusive` (boolean): Count the end date too (default false).
- `region` (string): Optional region/state code for countries with regional holidays, e.g. DE-BY, US-CA (or just BY).
- `to` (string, required): End date, YYYY-MM-DD (2020-2035).
- `types` (string): Optional holiday types that close business days: comma list of public, bank (default: public; "all" = public,bank).
- `weekend` (string): Optional weekend days, comma list of day names like "sat,sun" (default) or "fri,sat", or "none".

Output parameters:

- `business_days` (integer)
- `calendar_days` (integer)
- `country` (string)
- `from` (string)
- `holiday_days` (integer)
- `holiday_types` (array)
- `holidays` (array)
- `holidays_truncated` (boolean)
- `inclusive` (boolean)
- `region` (string)
- `to` (string)
- `weekend` (string)
- `weekend_days` (integer)

### `list_countries` (~40 tokens)

List supported countries and regions

List the supported countries (ISO codes), their regions and the supported year range. Read-only. Same data and limits as GET /v1/countries.

Output parameters:

- `count` (integer)
- `countries` (array)
- `data_version` (string)
- `years` (object)

## Diagnostics

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

## Score history

- 2026-10-24: 73
- 2026-10-23: 72
- 2026-10-22: 72
- 2026-10-21: 71
- 2026-10-20: 71
- 2026-10-19: 70
- 2026-10-18: 70
- 2026-10-17: 70
- 2026-10-16: 69
- 2026-10-15: 69
- 2026-10-14: 68
- 2026-10-13: 68
- 2026-10-12: 67

## Common questions

### What is the WorkdayAPI MCP server?

WorkdayAPI is an MCP server listed in the public MCP registry as dev.workers.mike-tusa.workdayapi/workdayapi. Business-day and public-holiday math for 29 countries: add business days, days between, holidays. This page covers its hosted endpoint (https://workdayapi.mike-tusa.workers.dev/mcp).

### Is the WorkdayAPI MCP server safe to use?

WorkdayAPI scores 73 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 WorkdayAPI MCP server expose?

WorkdayAPI exposes 5 tools: get_holidays, is_business_day, add_business_days, business_days_between, list_countries. Their descriptions and schemas cost roughly 907 tokens of context every time the server is loaded.

### Does the WorkdayAPI MCP server require authentication?

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

### Is the WorkdayAPI MCP server still maintained?

WorkdayAPI is still listed as active in the MCP registry. We last reached this channel on 24 October 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://workdayapi.mike-tusa.workers.dev/mcp
- Website: https://workdayapi.mike-tusa.workers.dev/
- Changelog RSS feed: https://verifymcp.io/servers/dev-workers-mike-tusa-workdayapi-workdayapi/workdayapi.xml
- Changelog JSON feed: https://verifymcp.io/servers/dev-workers-mike-tusa-workdayapi-workdayapi/workdayapi.json
- HTML version of this page: https://verifymcp.io/servers/dev-workers-mike-tusa-workdayapi-workdayapi/workdayapi