suomi-finnish-skill
A skill that teaches Claude and Codex to write Finnish by official rules: compound words, cases, punctuation and tone.
- 78 ★ on the repository
- Last commit
- MIT
Install
- Works in
In your terminal, with SkillFoxx CLI
npx skillfoxx add skills/suomi-finnish-skillDetects the agents on your machine, shows the access level and pins the version.
Other ways to install
Access and checks
How we reviewMinimal accessThe tool runs nothing and makes no network calls.
- The skill holds text rules only and runs nothing
This is third-party code. Review the repository files before installing.
What it does
The skill collects Finnish language rules from the Kielitoimiston ohjepankki guide (Institute for the Languages of Finland): spelling, grammar, punctuation, compound words and style. It fixes typical model errors: split compound words (verkko sivusto instead of `verkkosivu`), anglicisms, decimal points instead of commas, Oxford commas, capitalized weekdays and months, wrong case endings and lost `ä` and `ö`. The main `SKILL.md` holds the rules and six reference files in `references/` cover lists, sentence structure, inflection, punctuation, conventional notation and word choice in more detail. It activates automatically when Claude Code sees Finnish text work. The authors used it for hundreds of pages of web content.
Who it is for. Authors and translators who prepare Finnish texts with AI and want correct language without editing every sentence by hand.
Good fit when
- Pages for a Finnish site are written and the model confuses cases and compound words.
- A text is translated into Finnish without anglicisms.
- The model drops the dots over `a` and `o`, changing word meanings.
- An official publication is prepared where punctuation and accepted number notation matter.
Not a fit when
- The text is not in Finnish: the rules target this language only.
- A final read by a native speaker is needed: the skill lowers errors but does not replace an editor.
- Translation with client terminology control is needed: the skill does not know a project glossary.
Example request
Write a Finnish page about our support service and check compound words and cases.Limitations
The skill corrects Finnish only and follows the Institute for the Languages of Finland guide, it knows no rules of other languages. It lowers the model error rate but does not guarantee a flawless text: legal and official publications are still read by a native speaker. Installation is manual, by copying `SKILL.md` and the `references/` folder, and `SKILL.md` alone without the references works with the general rules only. A packaged archive and a combined file `suomi-finnish-full.md` exist. The license is MIT.
How to disable. Delete the `suomi-finnish` folder from the Claude Code or Codex skills directory. Texts already written do not change.
FAQ
How do I install the skill?
Copy `SKILL.md` and `references/` into `.claude/skills/suomi-finnish/` of a project or `~/.claude/skills/suomi-finnish/` for all projects.
Can one file be enough?
Yes, `SKILL.md` works alone but without the reference files. For the full set there is `suomi-finnish-full.md`.
Which errors does the skill catch?
Split compound words, anglicisms, decimal points, extra commas, capitalized weekdays and months, wrong cases and lost `ä` and `ö`.
Does it work in claude.ai?
Yes: upload the ready archive through Settings, Skills, Create skill.
What are the rules based on?
On the official Kielitoimiston ohjepankki guide maintained by the Institute for the Languages of Finland.
Discussion
No questions or reviews yet.
Related
SkillsThe "เขียนไทย" skill teaches Claude to write Thai that native readers find natural rather than machine-translated.
A skill that teaches an agent to write Turkish without English calques: it fixes sentence structure, collocations and UI copy
A Codex and Claude skill for short Chinese fiction from topic choice to release and review: the human decides, AI speeds up
Humanities Writing Companion walks a humanities paper through 12 modes: from sharpening the research question to a blind read and AI-use disclosure
A skill that translates and polishes English into Chinese by the Ye Zinan method, removes translationese and pairs paragraphs.
A set of 25 skills for Codex and Claude Code: articles, research, Remotion video, interfaces, GitHub and pre-release verification
README in short
The README explains frequent model mistakes in Finnish, six install options and the reference files. The rules rest on the official guide.