LexiLint MCP
Offline spell check and BYOK grammar checking for AI assistants. 100% offline spell check via nspell (zero tokens, zero API calls). BYOK grammar checking with your own Gemini, OpenAI, or Claude API key. Works with Claude Desktop, Cursor, ChatGPT, and any MCP-compatible tool. 8 languages supported.
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LexiLint MCP
Spell and grammar checking for AI assistants via Model Context Protocol (MCP).
Works with Claude Desktop, Cursor, ChatGPT, and any MCP-compatible tool.
Features
- π 100% offline spell check β uses nspell with local dictionaries. Zero tokens consumed. Zero API calls. Works without internet.
- π€ BYOK grammar check β bring your own Gemini (free tier), OpenAI, or Claude API key. Your text goes directly to your chosen provider.
- π° Zero token cost for spell check β stop wasting AI tokens on typo detection
- π 8 languages β English (US/UK), Spanish, French, German, Polish, Russian, Turkish
- β‘ Instant results β no latency, no rate limits, unlimited usage
Installation
Claude Desktop / Cursor / ChatGPT
Add to your MCP config:
{
"mcpServers": {
"lexilint": {
"command": "npx",
"args": ["-y", "lexilint-mcp"]
}
}
}
npm
npm install -g lexilint-mcp
Usage
Once installed, your AI assistant can use these tools:
spell_checkβ check text for spelling errors (100% offline)grammar_checkβ check text for grammar issues (requires API key)
Example
"Use the spell_check tool to check this text: 'Ths is a tset'"
The spell check runs locally β no tokens consumed.
Token Cost Comparison
| Method | Cost per 500-word check |
|---|---|
| Ask AI directly ("fix typos in this") | ~$0.02 (GPT-4) / ~$0.015 (Claude) |
| LexiLint MCP spell_check | $0.00 |
Grammar Check Setup
Grammar checking uses your own API key (BYOK):
- Get a free Google Gemini API key
- Set the environment variable:
{
"mcpServers": {
"lexilint": {
"command": "npx",
"args": ["-y", "lexilint-mcp"],
"env": {
"GEMINI_API_KEY": "your-key-here"
}
}
}
}
Supported providers: GEMINI_API_KEY, OPENAI_API_KEY, ANTHROPIC_API_KEY
Links
- π¦ npm package
- π Website & docs
- π§© Chrome Extension
- π MCP Registry
License
MIT
