Skip to content
anlyon.devby Anlyon

Business-Day Oracle

tech.noahsarch/business-day-oraclenoahsarch.techstreamable-httpv0.1.0Scanned

Working days, ISDA conventions and deadlines for 250 countries and 30 financial markets.

8 tools: 5 change things and 3 only read.

Tools: 0 delete, 0 irreversible, 5 write, 3 read.
  • Reads private data · 1
  • Reads text others write · 0
  • Can send data out · 0
  • 2 findings

Anlyon alternative

5 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

Import an OpenAPI spec →
Compare with similar serversMarkdownJSONReport this listing

Tools

Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.

8 tools

Changes things 5Claude Code: ask
  • add_working_daysMove N working days from a date, skipping weekends and holidays; returns the end date and every skipped day with its reason.1 finding

    Why it is in this group

    • The name "add_working_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_working_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_working_days" says "add": a word for a change.

      What this check looks for
    Description, as the server wrote it
    Move N working days from a date, skipping weekends and holidays; returns the end date and every skipped day with its reason. Delivery promises, SLA clocks, payment terms in business days. Example: start_date '2026-12-23', days 5, country 'DE', subdivision 'BY'. Calendar selection: country (ISO 3166-1 alpha-2, e.g. 'SA', 'DE', 'US') or market (MIC, e.g. 'XNYS', 'XLON'); optional subdivision (state/province/emirate code from list_calendars), categories (e.g. ['public','bank']), weekend override (['FRI','SAT']), extra_holidays (company/contract dates). Weekend defaults to the country's legal weekend. Response: result plus data_confidence (high = fixed-date calendar; medium = a lunar/moon-sighted or projected holiday is involved, or the caller overrode the weekend), estimated_items[] naming each projected date, sources[] (public references behind the calendar), data_version and warnings[].

    Annotations the server declares

    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
    • readOnlyHint: true
  • compute_deadlineCompute the end of a period ('within 30 calendar days', '10 working days', '3 months') from a start date under explicit counting rules, roll it by the chosen convention when it lan…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
    Compute the end of a period ('within 30 calendar days', '10 working days', '3 months') from a start date under explicit counting rules, roll it by the chosen convention when it lands on a non-working day, and return raw vs final deadline, skipped days and a step-by-step explanation plus a disclaimer. Pass the rules the contract/law states; defaults are the common ones. Example: start_date '2026-11-26', period 7, unit 'calendar_days', country 'GB'. Calendar selection: country (ISO 3166-1 alpha-2, e.g. 'SA', 'DE', 'US') or market (MIC, e.g. 'XNYS', 'XLON'); optional subdivision (state/province/emirate code from list_calendars), categories (e.g. ['public','bank']), weekend override (['FRI','SAT']), extra_holidays (company/contract dates). Weekend defaults to the country's legal weekend. Response: result plus data_confidence (high = fixed-date calendar; medium = a lunar/moon-sighted or projected holiday is involved, or the caller overrode the weekend), estimated_items[] naming each projected date, sources[] (public references behind the calendar), data_version and warnings[].

    Annotations the server declares

    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
    • readOnlyHint: true
  • is_working_daySay whether a date is a working day in a country/subdivision or market, and why not (weekend, holiday name, holiday observed, projected lunar holiday).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
    Say whether a date is a working day in a country/subdivision or market, and why not (weekend, holiday name, holiday observed, projected lunar holiday). Example: date '2027-03-10', country 'SA'. Calendar selection: country (ISO 3166-1 alpha-2, e.g. 'SA', 'DE', 'US') or market (MIC, e.g. 'XNYS', 'XLON'); optional subdivision (state/province/emirate code from list_calendars), categories (e.g. ['public','bank']), weekend override (['FRI','SAT']), extra_holidays (company/contract dates). Weekend defaults to the country's legal weekend. Response: result plus data_confidence (high = fixed-date calendar; medium = a lunar/moon-sighted or projected holiday is involved, or the caller overrode the weekend), estimated_items[] naming each projected date, sources[] (public references behind the calendar), data_version and warnings[].

    Annotations the server declares

    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
    • readOnlyHint: true
  • next_holidayThe next N holidays on or after a date with days_until and projection flags.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
    The next N holidays on or after a date with days_until and projection flags. Example: from_date '2026-11-01', country 'JP', count 3. Calendar selection: country (ISO 3166-1 alpha-2, e.g. 'SA', 'DE', 'US') or market (MIC, e.g. 'XNYS', 'XLON'); optional subdivision (state/province/emirate code from list_calendars), categories (e.g. ['public','bank']), weekend override (['FRI','SAT']), extra_holidays (company/contract dates). Weekend defaults to the country's legal weekend. Response: result plus data_confidence (high = fixed-date calendar; medium = a lunar/moon-sighted or projected holiday is involved, or the caller overrode the weekend), estimated_items[] naming each projected date, sources[] (public references behind the calendar), data_version and warnings[].

    Annotations the server declares

    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
    • readOnlyHint: true
  • roll_dateApply a business-day convention (following, modified following, preceding, modified preceding) to a date on a country or market calendar — payment dates, coupon dates, settlement, …1 finding

    Why it is in this group

    • The description's first verb is "apply": 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 "roll_date" 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 description's first verb is "apply": a word for a change.

      What this check looks for
    Description, as the server wrote it
    Apply a business-day convention (following, modified following, preceding, modified preceding) to a date on a country or market calendar — payment dates, coupon dates, settlement, SLA due dates. Example: date '2026-05-31', convention 'modified_following', market 'XLON'. Calendar selection: country (ISO 3166-1 alpha-2, e.g. 'SA', 'DE', 'US') or market (MIC, e.g. 'XNYS', 'XLON'); optional subdivision (state/province/emirate code from list_calendars), categories (e.g. ['public','bank']), weekend override (['FRI','SAT']), extra_holidays (company/contract dates). Weekend defaults to the country's legal weekend. Response: result plus data_confidence (high = fixed-date calendar; medium = a lunar/moon-sighted or projected holiday is involved, or the caller overrode the weekend), estimated_items[] naming each projected date, sources[] (public references behind the calendar), data_version and warnings[].

    Annotations the server declares

    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
    • readOnlyHint: true
Only reads 3Show 3 read-only tools
  • list_calendarsDiscover calendars: without arguments, all 250 countries and 30 markets; with a country code, its legal weekend, subdivision codes, holiday categories, languages, year range and pu…Reads private dataNo findings

    Why it is in this group

    • The name "list_calendars" says "list": a word for reading.

    What it can reach

    • private-dataThe name "list_calendars" says "list" and "calendar": it reads calendars.
    • private-dataThe description's first sentence says "calendar": it reads calendars.
    Description, as the server wrote it
    Discover calendars: without arguments, all 250 countries and 30 markets; with a country code, its legal weekend, subdivision codes, holiday categories, languages, year range and public sources. Free. Example: country 'US'. Response: result plus data_confidence (high = fixed-date calendar; medium = a lunar/moon-sighted or projected holiday is involved, or the caller overrode the weekend), estimated_items[] naming each projected date, sources[] (public references behind the calendar), data_version and warnings[].

    Annotations the server declares

    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
    • readOnlyHint: true
  • list_holidaysAll holidays of a year for a country/subdivision/categories or a market, each with local and English names, whether it is observed/shifted, projected (lunar), on a weekend, and whe…No findings

    Why it is in this group

    • The name "list_holidays" says "list": a word for reading.
    Description, as the server wrote it
    All holidays of a year for a country/subdivision/categories or a market, each with local and English names, whether it is observed/shifted, projected (lunar), on a weekend, and whether it counts as non-working. Example: year 2027, country 'IN', subdivision 'KA'. Calendar selection: country (ISO 3166-1 alpha-2, e.g. 'SA', 'DE', 'US') or market (MIC, e.g. 'XNYS', 'XLON'); optional subdivision (state/province/emirate code from list_calendars), categories (e.g. ['public','bank']), weekend override (['FRI','SAT']), extra_holidays (company/contract dates). Weekend defaults to the country's legal weekend. Response: result plus data_confidence (high = fixed-date calendar; medium = a lunar/moon-sighted or projected holiday is involved, or the caller overrode the weekend), estimated_items[] naming each projected date, sources[] (public references behind the calendar), data_version and warnings[].

    Annotations the server declares

    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
    • readOnlyHint: true
  • working_days_betweenCount working days between two dates with endpoint control; lists the non-working days.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 working days between two dates with endpoint control; lists the non-working days. Leave cost, lateness, elapsed business days. Example: '2026-05-18' → '2026-06-05', country 'AE', inclusive 'both'. Calendar selection: country (ISO 3166-1 alpha-2, e.g. 'SA', 'DE', 'US') or market (MIC, e.g. 'XNYS', 'XLON'); optional subdivision (state/province/emirate code from list_calendars), categories (e.g. ['public','bank']), weekend override (['FRI','SAT']), extra_holidays (company/contract dates). Weekend defaults to the country's legal weekend. Response: result plus data_confidence (high = fixed-date calendar; medium = a lunar/moon-sighted or projected holiday is involved, or the caller overrode the weekend), estimated_items[] naming each projected date, sources[] (public references behind the calendar), data_version and warnings[].

    Annotations the server declares

    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
    • readOnlyHint: true

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.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged untrusted-input or outbound.

Reads private data1
Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write0
Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out0
Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Findings

Matches of fixed checks, with the text they matched.

2 warn
  • Warnadd_working_days

    The server marks "add_working_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_working_days" says "add": a word for a change.

    What this check looks for
  • Warnroll_date

    The server marks "roll_date" 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 description's first verb is "apply": a word for a change.

    What this check looks for

History

Changes to its tool definitions and to its remote endpoint, newest first.

No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.

All changes to this server

Install

Pinned to version 0.1.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http business-day-oracle https://bizday.noahsarch.tech/mcp
claude mcp add --transport http business-day-oracle https://bizday.noahsarch.tech/mcp

Run in a terminal.

Claude Code permissions

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

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__business-day-oracle__working_days_between",
      "mcp__business-day-oracle__list_holidays",
      "mcp__business-day-oracle__list_calendars"
    ],
    "ask": [
      "mcp__business-day-oracle__is_working_day",
      "mcp__business-day-oracle__add_working_days",
      "mcp__business-day-oracle__roll_date",
      "mcp__business-day-oracle__compute_deadline",
      "mcp__business-day-oracle__next_holiday"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as business-day-oracle. Review it before you use it.

Capability tags behind 1 rule
  • mcp__business-day-oracle__list_calendars private-data

Pin

Keep the decision: fail CI when the tools change, follow every change, or show a badge.

Pin in CI

Fail a build when the tools you reviewed are not the tools the server serves today.

curl -s "https://anlyon.dev/api/v1/servers/tech.noahsarch/business-day-oracle/verify?hash=5ac9c7867c16d62269417f3c33648f096b1c1711416095210a6837045b7920c3" | jq -e '.changed == false'

Pinned hash 5ac9c7867c16, from Oct 31, 2026, 21:18 UTC.

Watch

Get told when its tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/tech.noahsarch/business-day-oracle/changes.xml

An Atom feed. Works in any feed reader or Slack's RSS app.

Badge

anlyon.dev badge for tech.noahsarch/business-day-oracle
[![anlyon.dev](https://anlyon.dev/badge/tech.noahsarch/business-day-oracle.svg)](https://anlyon.dev/servers/tech.noahsarch/business-day-oracle)

Source: MCP Registry. Synced Oct 31, 2026, 21:18 UTC.