SpellChecker

A fast, multilingual MCP server that adds spell-checking capabilities to your language models. It can check text, files, and whole projects with syntax-aware parsing for code, helping you consistently catch misspellings while respecting code structure and documentation.

How to use

You connect this server to an MCP-compatible client to perform spell checks across text, code comments, strings, and documentation. Enable only the languages you need, and run checks against individual files or entire folders. Use the provided tools to check text, verify word correctness, fetch suggestions, and extend your personal dictionaries.

How to install

Prerequisites: Node.js 16 or newer and a preferred package manager.

# Install dependencies
yarn install

# Build for production
yarn build

# Start the server (example)
node dist/index.js

Configuration and usage notes

Enable languages you want to support by configuring the SPELLCHECKER_LANGUAGES environment variable during startup. You can also provide a config file path or edit the default configuration before building.

Example startup with languages enabled via environment variable:

SPELLCHECKER_LANGUAGES="en-US,es,fr" node dist/index.js

Notes on syntax-aware checking

When syntax-aware parsing is enabled, the server checks only human-readable text within comments, strings, and documentation while ignoring identifiers, code keywords, URLs, file paths, and similar non-text content.

Troubleshooting

If you encounter missing dictionaries, run the post-install step or rebuild the dictionaries as needed.

Tools and capabilities overview

You can perform a range of spell-check related actions: check text, verify single words, fetch suggestions, and manage personal dictionaries, as well as list available languages and run file or folder checks with optional syntax-aware parsing.

Available tools

check_spelling

Checks a text string for spelling errors and returns misspellings with suggested corrections.

is_correct

Determines whether a single word is spelled correctly.

get_suggestions

Provides spelling suggestions for a given word.

add_to_dictionary

Adds a word to the personal dictionary for a selected language.

list_languages

Lists all available languages supported by the server.

check_file

Checks spelling within a single file with optional syntax-aware parsing.

check_folder

Checks spelling across all files in a folder, with optional recursion and file type filtering.