Korean holidays, business days & legal deadlines, won amounts in words, NEIS/SMS byte counts
Scored across 15 tools
Most tools target a clear, distinct task (address split, name split, phone format, PII masking, text count, amount conversion in each direction). The one soft cluster is date arithmetic — kr_business_day, kr_add_business_days, kr_count_business_days, kr_relative_date and kr_legal_deadline all touch business-day logic, and an agent could hesitate between 'add N business days' and 'legal deadline' without reading the descriptions carefully. The detailed descriptions largely resolve this, but the overlap keeps it below a 5.
All 15 tools share a consistent kr_ prefix and snake_case style with no camelCase or abbreviation drift. The internal word order varies (kr_add_business_days vs kr_address_split vs kr_amount_to_korean), so the verb/noun pattern is not uniform, but every name is predictable and readable.
15 tools sits squarely in the well-scoped range for a multi-domain utility kit. Each tool covers a distinct Korean-specific capability (holidays, business days, ages, amounts, addresses, names, phones, PII, text metrics) rather than duplicating functionality.
The surface covers the core Korean localization chores an agent would hit: date/holiday math, currency in both directions, age systems, address and name parsing, phone normalization, PII masking, and text counting. Minor gaps remain — no resident-registration-number validation (only masking), no forward Korean date-to-text rendering, and holiday data limited to 2024-2027 — but these are workable limits rather than dead ends.
Move forward (or back, with negative days) a number of South Korean business days from a start date, skipping weekends and public holidays. The start date itself is not counted. Use for deadlines like "within 7 business days". Holiday data covers 2024-2027 (source: KASI; updated 2026-11-12). It includes substitute holidays and election days, and the 2026 additions Labor Day (May 1) and Constitution Day (Jul 17).
Inputs: days (required), start, extra_closed_dates.
Split South Korean addresses into province/city (시도, normalized to the official name such as 서울특별시), district (시군구, including 일반구 like 수원시 영통구), base address (road name + building number) and detail (unit). Handles leading postal codes and addresses written without spaces. Rule-based; does not look up a database.
Inputs: addresses (required).
Compute international age (만 나이, the legal standard in Korea since June 2023) and year age (연 나이, used by the Youth Protection Act and military service) on a reference date. Input a birth date, or the first 7 digits of a resident registration number (YYMMDD-G) to also get sex and century. Feb 29 birthdays turn a year older on Mar 1 in common years. The input is not stored.
Inputs: birth (required), on.
Write a won amount in Korean words exactly: reading form ("백이십삼만 사천오백육십칠 원", spaced every 만 per Korean orthography), contract/receipt form ("일금 일백이십삼만사천오백육십칠원정"), and mixed form ("123만 4,567원"). Whole numbers below 10^20.
Inputs: amount (required).
Check whether a date is a business day in South Korea (not a weekend and not a public holiday), and give the previous and next business days. Holiday data covers 2024-2027 (source: KASI; updated 2026-11-12). It includes substitute holidays and election days, and the 2026 additions Labor Day (May 1) and Constitution Day (Jul 17).
Inputs: date, extra_closed_dates.
Validate the format and check digit of South Korean business registration numbers (사업자등록번호, 10 digits, NTS weights 1,3,7,1,3,7,1,3,5) and format them as 123-45-67890. This is an offline checksum test only: it does not tell whether the business is open or closed.
Inputs: numbers (required).
Count South Korean business days between two dates (both ends included by default). Also returns weekend and weekday-holiday counts. Holiday data covers 2024-2027 (source: KASI; updated 2026-11-12). It includes substitute holidays and election days, and the 2026 additions Labor Day (May 1) and Constitution Day (Jul 17).
Inputs: to (required), from (required), include_end, include_start, +1 more.
List South Korean public holidays (공휴일) for a year or a date range, with Korean names. Holiday data covers 2024-2027 (source: KASI; updated 2026-11-12). It includes substitute holidays and election days, and the 2026 additions Labor Day (May 1) and Constitution Day (Jul 17).
Inputs: to, from, year.
Read a Korean money expression as an exact number: "1억 2천만 원", "삼백오십만원", "일금 일백만원정", "2.5억", "12만3천". Returns digits and comma form.
Inputs: text (required).
Compute when a period expires under the Korean Civil Act (arts. 155-161), the default rule when a law or contract does not say otherwise: the first day is not counted unless the period starts at 00:00; weeks, months and years follow the calendar and end the day before the corresponding date (or at month end if that date does not exist); if the last day is a Saturday, Sunday or public holiday the deadline moves to the next working day. Use for "within 14 days of receipt", "1 month from notice", contract terms. Not legal advice; some statutes set their own rules. Holiday data covers 2024-2027 (source: KASI; updated 2026-11-12). It includes substitute holidays and election days, and the 2026 additions Labor Day (May 1) and Constitution Day (Jul 17).
Inputs: unit (required), amount (required), event_date (required), extra_closed_dates, +1 more.
Mask Korean personal data before you store, log or share it. Text mode finds and masks resident registration numbers (900101-1******), phone numbers (010--5678), emails (ab@x.com) and 16-digit card numbers inside free text. Item mode masks given values by kind, including names (홍*동). Nothing is stored or logged.
Inputs: text, items.
Split Korean full names into family name and given name, recognizing two-character surnames (남궁, 황보, 제갈, 선우 …). Flags names that are ambiguous from the characters alone (선우진 = 선 + 우진 or 선우 + 진). Latin-script names use the last word as family name.
Inputs: names (required).
Normalize South Korean phone numbers (mobile 010, Seoul 02, regional 031-064, 070, 050x safe numbers, 15xx/16xx/18xx company numbers) to one style. Restores a leading 0 dropped by Excel, converts +82, keeps extensions. Unknown shapes return null.
Inputs: numbers (required), style.
Turn a Korean relative date expression into an exact date and weekday, counted from a base date in Korea time: 오늘/내일/모레/내일모레/글피, 어제/그제, "3일 뒤", "이틀 후", "2주 후", "한 달 뒤", "3영업일 후", "다음 주 화요일", "지난주 금요일", "이번 주말", "금요일", "다음 달 말일", "이번 달 25일", "내년 3월 1일", "연말". Weeks start on Monday. Also says whether the result is a Korean business day. Use this instead of working out weekdays yourself.
Inputs: expressions (required), base_date.
Count Korean text exactly: characters with and without spaces (as Korean job sites count 자기소개서), lines, words, UTF-8 bytes, NEIS school-record bytes (Hangul 3, ASCII 1), and SMS/LMS bytes with the message type. Models see tokens, not characters, so use this instead of estimating length.
Inputs: text (required).
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Korean personal tax, payroll, labor, real estate and calendar calculators. Code, no LLM.
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