UAE Calendar Oracle

tech.noahsarch/uae-calendar-oraclenoahsarch.techstreamable-httpv0.1.0Scanned 52 minutes ago

UAE working days, holidays with confirmation status, Hijri dates, Ramadan hours, deadlines.

10 tools: 6 change things and 4 only read.

Reads private data · 0
Reads text others write · 1
Can send data out · 0
3 findings

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

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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.

10 tools

Changes things 6Creates or changes something that can be changed back.Claude Code: ask

add_working_daysCompute the date N working days after (or before, if N is negative) a start date for a UAE emirate/sector, skipping weekends and public holidays, and list every skipped day with it…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
Compute the date N working days after (or before, if N is negative) a start date for a UAE emirate/sector, skipping weekends and public holidays, and list every skipped day with its reason. Use for SLAs, delivery promises, HR processing times and 'within X business days' wording. Example: {start_date:'2026-05-21', days:3, emirate:'federal', sector:'public'} → end_date 2026-06-02 (Eid Al Adha week skipped). Response always includes data_confidence ('high' = all dates officially announced/confirmed, 'medium' = something is estimated), estimated_items[], sources[] (official URLs) and data_version.
Annotations the server declares
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- readOnlyHint: true
compute_deadlineCompute a deadline from a start date and a period in calendar days, working days, Gregorian months or Hijri months, applying the counting rules YOU specify (exclude start day, exte…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 a deadline from a start date and a period in calendar days, working days, Gregorian months or Hijri months, applying the counting rules YOU specify (exclude start day, extend past weekends/holidays, half-day handling, estimated-holiday handling). Returns the deadline, the raw date before extension, every skipped day and a step-by-step explanation. Use when drafting contract, notice, appeal or payment deadlines in the UAE. This is date arithmetic only; it does not state what any law requires, and every response carries a disclaimer field. Example: {start_date:'2026-11-26', period:7, unit:'calendar_days', emirate:'federal', sector:'public'} → raw 2026-12-03 (National Day, estimated) → deadline 2026-12-04, data_confidence 'medium'. Response always includes data_confidence ('high' = all dates officially announced/confirmed, 'medium' = something is estimated), estimated_items[], sources[] (official URLs) and data_version.
Annotations the server declares
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- readOnlyHint: true
gregorian_to_hijriConvert a Gregorian date to the Hijri (Islamic) calendar using the Umm al-Qura tables, with month names in English and Arabic.1 finding
Why it is in this group
- The description's first verb is "convert": 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 "gregorian_to_hijri" 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 "convert": a word for a change.
  What this check looks for
Description, as the server wrote it
Convert a Gregorian date to the Hijri (Islamic) calendar using the Umm al-Qura tables, with month names in English and Arabic. The result is COMPUTED: the official UAE date is set by moon sighting and may differ by ±1 day, so data_confidence is 'medium'. Use for Hijri-dated documents and to estimate Islamic holidays. Example: {date:'2026-03-20'} → 1 Shawwal 1447 AH. Response always includes data_confidence ('high' = all dates officially announced/confirmed, 'medium' = something is estimated), estimated_items[], sources[] (official URLs) and data_version.
Annotations the server declares
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- readOnlyHint: true
hijri_to_gregorianConvert a Hijri date 'YYYY-MM-DD' (1343–1500 AH) to Gregorian using the Umm al-Qura tables, with the weekday.1 finding
Why it is in this group
- The description's first verb is "convert": 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 "hijri_to_gregorian" 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 "convert": a word for a change.
  What this check looks for
Description, as the server wrote it
Convert a Hijri date 'YYYY-MM-DD' (1343–1500 AH) to Gregorian using the Umm al-Qura tables, with the weekday. COMPUTED, ±1 day versus the moon-sighted UAE date; data_confidence 'medium'. Example: {hijri_date:'1448-01-01'} → 2026-06-16 (Tue). Response always includes data_confidence ('high' = all dates officially announced/confirmed, 'medium' = something is estimated), estimated_items[], sources[] (official URLs) and data_version.
Annotations the server declares
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- readOnlyHint: true
is_working_dayTell whether a date is a working day in the UAE for a given emirate and sector, and why not (weekend, named public holiday with its status, or Friday half day).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
Tell whether a date is a working day in the UAE for a given emirate and sector, and why not (weekend, named public holiday with its status, or Friday half day). Call this before scheduling, promising delivery, booking, or filing anything on a UAE date. Islamic holidays depend on moon sighting: the result says whether the holiday is 'estimated' (not yet announced) or 'confirmed'. Example: {date:'2026-05-25', emirate:'federal', sector:'public'} → is_working_day=false, reason 'Eid Al Adha (extended federal break)', status confirmed; the same date for sector 'private' → true. Response always includes data_confidence ('high' = all dates officially announced/confirmed, 'medium' = something is estimated), estimated_items[], sources[] (official URLs) and data_version.
Annotations the server declares
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- readOnlyHint: true
working_hoursTell whether a specific datetime falls within standard working hours for an emirate/sector, taking into account weekends, holidays, the federal Friday half day (07:30–12:00) and of…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
Tell whether a specific datetime falls within standard working hours for an emirate/sector, taking into account weekends, holidays, the federal Friday half day (07:30–12:00) and official Ramadan hours. Private-sector hours are employer-specific; a default schedule is used and flagged. Use before calling a government office, scheduling a meeting or promising same-day action. Example: {datetime:'2026-03-05T13:00:00+04:00', emirate:'federal', sector:'public'} → within_working_hours true, hours_today 09:00–14:30 (Ramadan). Response always includes data_confidence ('high' = all dates officially announced/confirmed, 'medium' = something is estimated), estimated_items[], sources[] (official URLs) and data_version.
Annotations the server declares
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- readOnlyHint: true

Only reads 4Looks things up and changes nothing.Show 4 read-only tools

list_holidaysList all public holidays for a Gregorian year, emirate and sector, with English and Arabic names, dates, status (estimated | announced | confirmed | moved, with original dates when…Reads text others writeNo findings
Why it is in this group
- The name "list_holidays" says "list": a word for reading.
What it can reach
- untrusted-inputThe description's first sentence says "list" and "url": it reads web pages, which anyone can write.
Description, as the server wrote it
List all public holidays for a Gregorian year, emirate and sector, with English and Arabic names, dates, status (estimated | announced | confirmed | moved, with original dates when moved), official source URL and last-checked time. Use for annual planning, HR calendars and to show users which dates are still provisional. Example: {year:2026, emirate:'federal', sector:'private'} → 8 holidays, National Day still 'estimated'. Response always includes data_confidence ('high' = all dates officially announced/confirmed, 'medium' = something is estimated), estimated_items[], sources[] (official URLs) and data_version.
Annotations the server declares
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- readOnlyHint: true
next_holidayReturn the next public holiday on or after a date for an emirate/sector: names (EN/AR), dates, status, days until, source.No findings
Why it is in this group
- The description's first verb is "return": a word for reading.
Description, as the server wrote it
Return the next public holiday on or after a date for an emirate/sector: names (EN/AR), dates, status, days until, source. Use for 'when is the next long weekend / holiday' questions and to warn about upcoming closures. Example: {from_date:'2026-10-31', emirate:'federal', sector:'public'} → Eid Al Etihad 2–3 Dec 2026, estimated, 32 days away. Response always includes data_confidence ('high' = all dates officially announced/confirmed, 'medium' = something is estimated), estimated_items[], sources[] (official URLs) and data_version.
Annotations the server declares
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- readOnlyHint: true
ramadan_infoReturn Ramadan start/end for a Gregorian year (observed or estimated) and the officially published reduced working-hour rules for the emirate/sector (e.g.No findings
Why it is in this group
- The description's first verb is "return": a word for reading.
Description, as the server wrote it
Return Ramadan start/end for a Gregorian year (observed or estimated) and the officially published reduced working-hour rules for the emirate/sector (e.g. federal 09:00–14:30 Mon–Thu, 09:00–12:00 Fri; private sector −2 hours/day). If no rule has been published for that profile the response says 'not_announced' instead of guessing. Use for scheduling during Ramadan and for HR policy questions. Example: {year:2026, emirate:'federal', sector:'public'} → 18 Feb–19 Mar 2026, confirmed, FAHR Circular 1/2026 hours. Response always includes data_confidence ('high' = all dates officially announced/confirmed, 'medium' = something is estimated), estimated_items[], sources[] (official URLs) and data_version.
Annotations the server declares
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
- readOnlyHint: true
working_days_betweenCount working days between two dates for a UAE emirate/sector (choose which endpoints to include), with the number of Friday half days and the list of non-working days in the range…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 for a UAE emirate/sector (choose which endpoints to include), with the number of Friday half days and the list of non-working days in the range. Use for leave calculations, payroll, project durations and lateness. Example: {start_date:'2026-05-18', end_date:'2026-06-05', emirate:'federal', sector:'public'} → working_days 10, of_which_half_days 2. Response always includes data_confidence ('high' = all dates officially announced/confirmed, 'medium' = something is estimated), estimated_items[], sources[] (official URLs) and data_version.
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 private-data or outbound.

Reads private data0: Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write1: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.; list_holidays
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.

3 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
Warngregorian_to_hijri
The server marks "gregorian_to_hijri" 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 "convert": a word for a change.
What this check looks for
Warnhijri_to_gregorian
The server marks "hijri_to_gregorian" 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 "convert": 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 uae-calendar-oracle https://oracle.noahsarch.tech/mcp

claude mcp add --transport http uae-calendar-oracle https://oracle.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__uae-calendar-oracle__working_days_between",
      "mcp__uae-calendar-oracle__list_holidays",
      "mcp__uae-calendar-oracle__next_holiday",
      "mcp__uae-calendar-oracle__ramadan_info"
    ],
    "ask": [
      "mcp__uae-calendar-oracle__is_working_day",
      "mcp__uae-calendar-oracle__add_working_days",
      "mcp__uae-calendar-oracle__compute_deadline",
      "mcp__uae-calendar-oracle__gregorian_to_hijri",
      "mcp__uae-calendar-oracle__hijri_to_gregorian",
      "mcp__uae-calendar-oracle__working_hours"
    ],
    "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 uae-calendar-oracle. Review it before you use it.

Capability tags behind 1 rule

mcp__uae-calendar-oracle__list_holidays untrusted-input

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/uae-calendar-oracle/verify?hash=852b9f440f6346fc18b4888bed20b9ecd376077b79a019bed16bea39e14fa0e2" | jq -e '.changed == false'

Pinned hash 852b9f440f63, 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/uae-calendar-oracle/changes.xml

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