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Korean Character Count

nomadamas/k-skill
1.7k installs5.3k stars
Summary

If you've ever had a Korean college application or job form reject your carefully written essay because you were off by three characters, this is for you. It counts Korean text deterministically using Unicode grapheme clusters, not LLM guesses. You get exact character, line, and byte counts with two profiles: default uses UTF-8 encoding, while neis follows the byte rules used by Korea's education records system. It doesn't trim or normalize your input, just counts what's actually there. Runs as a Node.js helper script with no API keys needed. Honestly, it's solving a very specific problem, Korean form limits with exact counting requirements, but it solves it correctly.

Install to Claude Code

npx -y skills add nomadamas/k-skill --skill korean-character-count --agent claude-code

Installs into .claude/skills of the current project.

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SKILL.mdView on GitHub

한국어 글자 수 세기

What this skill does

자기소개서, 지원서, 자유서술형 폼처럼 글자 수 제한이 중요한 한국어 텍스트를 대상으로 LLM 추정 없이 결정론적으로 카운트한다.

  • 기본 글자 수: Intl.Segmenter 기반 Unicode extended grapheme cluster
  • 줄 수: CRLF, LF, CR, U+2028, U+2029 를 줄바꿈 1회로 계산
  • 기본 byte 수: UTF-8 실제 인코딩 길이
  • 호환 프로필: neis byte 규칙

When to use

  • "이 자기소개서 1000자 넘는지 정확히 세줘"
  • "이 텍스트를 UTF-8 byte 기준으로 계산해줘"
  • "줄 수랑 byte 수도 같이 알려줘"
  • "한글/영문/이모지 섞인 문장을 추정 말고 코드로 세줘"

Why this skill exists

  • 글자 수 제한은 1자 차이도 민감하다.
  • LLM이 글자 수를 눈대중으로 예측하면 재현성이 없다.
  • 이 스킬은 입력을 임의로 trim/정규화하지 않고, 문서화된 계약으로만 센다.

Contracts

default profile

  • characters: Intl.Segmenter("ko", { granularity: "grapheme" })
  • bytes: Buffer.byteLength(text, "utf8")
  • lines:
    • empty string => 0
    • non-empty => 줄바꿈 시퀀스 수 + 1
    • CRLF 는 2줄바꿈이 아니라 1줄바꿈으로 센다.

neis profile

  • characters: default 와 동일
  • lines: default 와 동일
  • bytes:
    • 한글 grapheme => 3B
    • ASCII grapheme => 1B
    • Enter/줄바꿈 시퀀스 => 2B
    • 그 외 문자는 UTF-8 byte 길이로 fallback

Prerequisites

  • node 18+
  • 설치된 skill payload 안에 scripts/korean_character_count.js helper 포함
  • 별도 API 키 없음

Workflow

  1. 텍스트를 직접 받거나 파일/STDIN으로 읽는다.
  2. node scripts/korean_character_count.js 로 결정론적 카운트를 실행한다.
  3. 필요한 프로필(default/neis)과 출력 형식(json/text)을 고른다.
  4. 결과를 그대로 반환하고, 어떤 계약으로 셌는지 함께 알려준다.

CLI examples

node scripts/korean_character_count.js --text "가나다"
node scripts/korean_character_count.js --text $'첫 줄\r\n둘째 줄🙂'
node scripts/korean_character_count.js --text $'첫 줄\n둘째 줄🙂' --profile neis --format text
node scripts/korean_character_count.js --file ./essay.txt --profile default
cat essay.txt | node scripts/korean_character_count.js --stdin --profile neis

Response policy

  • 추정하지 말고 helper 결과를 그대로 쓴다.
  • 어떤 profile로 셌는지 함께 보여준다.
  • 기본값이 필요하면 default profile을 사용한다.
  • 제출처가 NEIS/학교생활기록부 같은 별도 계약을 요구할 때만 neis 를 쓴다.

Done when

  • 글자 수, 줄 수, byte 수가 함께 반환된다.
  • default 와 neis 계약 차이가 문서에 명시된다.
  • node scripts/korean_character_count.js --help 가 동작한다.
  • 혼합 한국어/영문/공백/개행/emoji 입력에 대한 테스트가 있다.

Notes

  • Unicode grapheme clusters: https://www.unicode.org/reports/tr29/
  • WHATWG Encoding Standard: https://encoding.spec.whatwg.org/
  • Node Buffer.byteLength: https://nodejs.org/api/buffer.html
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First SeenMay 16, 2026
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