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WorkdayAPI

by workdayapi.mike-tusa.workers.dev · remote · no sign-in to list tools · v0.2.0 · published by dev.workers.mike-tusa.workdayapi

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

Changes · 2
CompareRegistry entry

5 tools: 2 change things and 3 only read.

Scanned Oct 21, 2026

1 check matched something in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http workdayapi https://workdayapi.mike-tusa.workers.dev/mcp

Findings

Matches of fixed checks, with the text they matched.

1 warn
  • Warnadd_business_days

    The server marks "add_business_days" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

    Matched text

    annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "add_business_days" says "add": a word for a change.

    What this check looks for

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

5 tools

Changes things 2Claude Code: ask
  • add_business_daysAdd (or, with a negative number, subtract) business days to a date, skipping weekends and public holidays of the country (and region).1 finding

    Why it is in this group

    • The name "add_business_days" says "add": a word for a change.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    Findings

    • Warn

      The server marks "add_business_days" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

      Matched text

      annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "add_business_days" says "add": a word for a change.

      What this check looks for
    Description, as the server wrote it
    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.

    Annotations the server declares

    • title: Add business days
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • is_business_dayCheck whether a date is a business day in a country (and region), considering weekends and public holidays.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • title: Is business day
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
Only reads 3Claude Code: allow
  • business_days_betweenCount business days between two dates in a country (and region), excluding weekends and public holidays.No findings

    Why it is in this group

    • The description's first verb is "count": a word for reading.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • title: Business days between
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • get_holidaysList 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.No findings

    Why it is in this group

    • The name "get_holidays" says "get": a word for reading.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • title: Get holidays
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • list_countriesList the supported countries (ISO codes), their regions and the supported year range.No findings

    Why it is in this group

    • The name "list_countries" says "list": a word for reading.
    Description, as the server wrote it
    List the supported countries (ISO codes), their regions and the supported year range. Read-only. Same data and limits as GET /v1/countries.

    Annotations the server declares

    • title: List countries
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 0.2.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http workdayapi https://workdayapi.mike-tusa.workers.dev/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__workdayapi__get_holidays",
      "mcp__workdayapi__business_days_between",
      "mcp__workdayapi__list_countries"
    ],
    "ask": [
      "mcp__workdayapi__is_business_day",
      "mcp__workdayapi__add_business_days"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as workdayapi. Review it before you use it.