Fluent Korean 🤖 Agent Open source

What it does

Fluent Korean is a small Claude Code plugin that ships output styles for writing clear Korean. Coding agents are often tuned to be terse, and in Korean that tends to produce dropped particles and verb endings, strings of bare nouns and odd vocabulary that are hard to read and easy to misread. This plugin adds instructions at the system-prompt level that tell the model to restore those elements and prefer plain, commonly used words, aiming for unambiguous meaning over elegant prose. The author, who studied Korean literature, wrote the guideline text and the Korean parts of the README by hand.

What is inside

• fluent-korean: an output style that keeps Claude Code's coding instructions, for normal development work
• fluent-korean-not-coding: a variant with the coding instructions removed, for sessions where Claude is not editing code
• Optional add-on lines in the README for extra behaviour, such as explaining things for beginner developers, using honorifics, avoiding rare dictionary words, applying the rules to all Korean output, or always answering in Korean
• Guidance for using the same text as custom instructions in Claude's web and desktop apps or in other AI tools

Works with

It is packaged as a Claude Code plugin. Because the core is a Markdown instruction file, it can be pasted into CLAUDE.md, project instructions or other assistants' settings, though that is a manual step.

How to install

/plugin marketplace add snflkd/fluent-korean
/plugin install fluent-korean@fluent-korean

After installing, pick one of the two styles in /config and start a new session or run /clear.

Maintenance and safety

The plugin is MIT-licensed, recently updated and contains only instruction text, with no scripts. The author notes that it uses slightly more tokens, that adherence weakens in long or instruction-heavy sessions, and that subagent behaviour should be checked. The README is mostly in Korean with a short English summary.

Who should use it

Korean-speaking developers who prompt Claude Code in Korean or produce Korean documentation, commit messages or reports and find the default output hard to read. It does nothing for English-only work.