Kitbench

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

Exact Japanese text & date tools: char count, business days with JP holidays, era, tax, units.

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Copy this into your MCP client config:

{
  "mcpServers": {
    "Kitbench": {
      "url": "https://kitbench.net/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (7)

• count_characters read-only

  Count characters in a text exactly as KitBench's character counter does. Counts user-perceived characters (grapheme clusters: emoji sequences, combining marks and flags count as 1), plus counts excluding newlines and whitespace, half-width characters counted as 0.5, lines, paragraphs, Japanese manuscript paper (genkō yōshi, 20x20) sheets, UTF-8 bytes, English words, and a breakdown into hiragana, katakana, kanji, Latin letters, digits and other. Strong for Japanese text and character limits. Text up to 200,000 characters.

  Parameters:

  • text (required) — string — The text to count (max 200,000 characters).
  • limit — integer — Optional character limit; the result then shows how many characters remain or are over.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• days_between read-only

  Count the days between two dates: total days (optionally including the start day), weeks and days, years/months/days, Japanese business days (excluding weekends and Japanese national holidays from the Cabinet Office list) and weekdays (Mon-Fri). Exact calendar arithmetic, no time zones. Dates 1873-01-01 to 2200-12-31.

  Parameters:

  • start_date (required) — string — Date in YYYY-MM-DD (1873-01-01 to 2200-12-31)
  • end_date (required) — string — Date in YYYY-MM-DD (1873-01-01 to 2200-12-31)
  • lang — string — Language of the user. Use "ja" when the user writes in Japanese (affects the source link and notes). Default "en".
  • include_start_day — boolean — Count the start day too (e.g. 2026-01-01 to 2026-01-01 = 1 day). Default false.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• add_days read-only

  Find the date N days (or N business days) after or before a date, with its weekday and Japanese era date (wareki). unit "business" skips Saturdays, Sundays and Japanese national holidays; "weekdays" skips only weekends. Good for deadlines in Japan. N from 0 to 100,000.

  Parameters:

  • start_date (required) — string — Date in YYYY-MM-DD (1873-01-01 to 2200-12-31)
  • days (required) — integer — How many days to move.
  • lang — string — Language of the user. Use "ja" when the user writes in Japanese (affects the source link and notes). Default "en".
  • unit — string — "calendar" (default), "business" (Japan: skip weekends and national holidays) or "weekdays" (skip weekends only).
  • direction — string — Default "after".

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• calculate_age read-only

  Calculate exact age from a birth date: age in years, years/months/days, Japanese kazoedoshi (traditional age), days since birth, next birthday and days until it, weekday of birth, Japanese era (wareki) of the birth date and the zodiac animal (eto). February 29 birthdays move to March 1 in non-leap years. Reference date defaults to today in Japan.

  Parameters:

  • birth_date (required) — string — Date in YYYY-MM-DD (1873-01-01 to 2200-12-31)
  • lang — string — Language of the user. Use "ja" when the user writes in Japanese (affects the source link and notes). Default "en".
  • reference_date — string — Date in YYYY-MM-DD (1873-01-01 to 2200-12-31)

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• convert_japanese_era read-only

  Convert between Western (Gregorian) dates and Japanese era dates (wareki: Meiji, Taisho, Showa, Heisei, Reiwa), using exact era start dates and "gannen" (元年) for year 1. Give either date (YYYY-MM-DD), or wareki such as "令和元年5月1日" / "R1.5.1", or era + year + month + day. Rejects dates that do not exist in that era (e.g. Heisei 31-05-01). Range 1873-01-01 to 2200-12-31.

  Parameters:

  • day — integer
  • era — string — 明治/大正/昭和/平成/令和 or Meiji/Taisho/Showa/Heisei/Reiwa (use with year, month, day).
  • date — string — Date in YYYY-MM-DD (1873-01-01 to 2200-12-31)
  • year — ['integer', 'string'] — Year in the era (1 or "元" for the first year).
  • month — integer
  • wareki — string — Japanese era date to convert to Western, e.g. "令和元年5月1日", "平成31年4月30日", "S64.1.7".

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• consumption_tax read-only

  Calculate Japanese consumption tax with exact integer arithmetic: tax-excluded to tax-included or tax-included to tax-excluded, at 10% (standard), 8% (reduced) or any rate from 0 to 100 with up to 2 decimals, rounding down (floor, default), half up (round) or up (ceil). Returns the tax amount, both prices and the formula. Amounts are whole yen up to 13 digits.

  Parameters:

  • amount (required) — ['integer', 'string'] — Amount in yen (whole number, up to 13 digits).
  • rate — ['number', 'string'] — Tax rate in percent. Default 10. 8 for the reduced rate (food, newspapers).
  • rounding — string — How to round fractions of a yen in the tax. Default "floor" (most common in Japan).
  • amount_type — string — Is amount tax-excluded (default; adds tax) or tax-included (extracts tax)?

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• convert_units read-only

  Convert units with official exact factors (NIST etc.), including Japanese units (tsubo, jo/tatami, shaku, sun, go, Japanese cups and spoons), temperature and fuel economy. Returns the exact result, a rounded display value, the factor, and extras such as feet-and-inches, inch fractions (1/16) and pounds-and-ounces. Unit ids by category - length: mm, cm, m, km, in, ft, yd, mi, nmi, shaku, sun; mass: mg, g, kg, t, oz, lb, st, ons, kwintal; temp: c, f, k; volume: ml, l, m3, tsp, tbsp, floz, cup, pt, qt, gal, flozuk, galuk, cupjp, tbspjp, tspjp, go; area: cm2, m2, ha, km2, sqin, sqft, sqyd, ac, sqmi, tsubo, jo, donum; speed: mps, kmh, mph, kn, fps; fuel: kml, l100, mpg, mpguk; pressure: pa, kpa, mpa, bar, psi, atm, mmhg; energy: j, kj, cal, kcal, wh, kwh, btu; power: w, kw, hp, ps; data: b, kb, mb, gb, tb, kib, mib, gib, tib.

  Parameters:

  • value (required) — ['number', 'string'] — Number to convert. Strings may use "," as thousands separator or fractions like "5 1/4".
  • from (required) — string — Unit id to convert from.
  • to (required) — string — Unit id to convert to (same category).
  • lang — string — Language of the user. Use "ja" when the user writes in Japanese (affects the source link and notes). Default "en".
  • category — string — Optional; inferred from the units.
  • significant_digits — integer — Significant digits of result_formatted. Default 6.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

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