seppegadeyne/language-mcp

A local MCP server for Dutch, US English, and French language checks, built for AI agents
(Hermes, Claude, and others) that write resumes, cover letters, blog articles,
and website copy.
Currently supported: Dutch, US English, and French. Additional languages can
be implemented by adding dictionaries, language-specific rules, and MCP tools;
they are not supported automatically by selecting an arbitrary language.
## Tools
| Tool | Source | Network | Purpose |
| check_us_english_text | hunspell en_US + British form detection (local) | No | Check text for typos and British spelling or vocabulary, with US replacements |
| check_us_english_b1_text | hunspell en_US -m + rule layers (local) | No | B1 plain-language proxies: readability (Flesch Reading Ease, Flesch-Kincaid, ARI), sentence/paragraph length, passive voice, jargon, wordy phrases, hidden verbs, filler, idioms, nominalization density, "you" address |
| validate_us_english_word | hunspell en_US + British form detection (local) | No | Check a single English word for correct US English spelling and suggest replacements |
| check_dutch_text | OpenTaal/hunspell + selected spelling rules (local) | No | Check words and selected compounds, hyphens, and calendar capitalization; return suggestions, positions, rule IDs, explanations, confidence, and source links |
| check_dutch_b1_text | OpenTaal/hunspell -m + rule layers (local) | No | B1 simplicity proxies: readability (Flesch-Douma, ARI, LIX, Brouwer Leesindex), sentence/paragraph length, passive voice, officialese jargon, filler, idioms, rare-word flags from a Zipf frequency table with plain-synonym suggestions (Open Dutch WordNet), nominalization density, je/u voice |
| validate_dutch_word | OpenTaal/hunspell (local) | No | Check a single Dutch word locally for correct spelling, with suggestions |
| check_french_text | hunspell fr (Dicollecte, "toutes variantes") (local) | No | Spell-check French text: unknown words with suggestions and positions; elisions with straight or typographic apostrophes, hyphenated words, and non-breaking spaces handled |
| check_french_b1_text | hunspell fr -m + rule layers (local) | No | B1 plain-language proxies: readability (Kandel & Moles), sentence/paragraph length, passive voice (être + participle), tu/vous address form (default vous) |
| validate_french_word | hunspell fr (local) | No | Check a single French word for correct spelling and suggest replacements |
| get_dutch_word_details | woordenlijst.org (MolexServe) | Yes | Retrieve lemma details: part of speech, pronunciation, hyphenation, paradigm, and diminutive forms |
The local tools use bundled hunspell dictionaries: OpenTaal for Dutch (v2.20.23)
and SCOWL/LibreOffice en_US for US English. The detector for British forms
catches terms that hunspell does not flag (whilst, towards, bespoke,
webshop, sole trader, findability, etc.), including categories from the
Straffe Sites US English guidelines, and provides a US replacement for each match.
French uses the Dicollecte/Grammalecte dictionary (v7.7, "toutes variantes": both traditional
and 1990 reform spellings are accepted). Details, limits, and licenses: French checks.