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by modelcontextprotocol
by xuzexin-hz
LexiLint
FreeNot checkedOffline spell check and BYOK grammar checking for AI assistants. 100% offline spell check via nspell (zero tokens, zero API calls). BYOK grammar checking with y
About
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.
README
Spell and grammar checking for AI assistants via Model Context Protocol (MCP).
Works with Claude Desktop, Cursor, ChatGPT, and any MCP-compatible tool.
Features
- 🔒 100% offline spell check — uses nspell with local dictionaries. Zero tokens consumed. Zero API calls. Works without internet.
- 🤖 BYOK grammar check — bring your own Gemini (free tier), OpenAI, or Claude API key. Your text goes directly to your chosen provider.
- 💰 Zero token cost for spell check — stop wasting AI tokens on typo detection
- 🌍 8 languages — English (US/UK), Spanish, French, German, Polish, Russian, Turkish
- ⚡ Instant results — 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_check— check text for spelling errors (100% offline)grammar_check— 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 — 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
License
MIT
Install LexiLint in Claude Desktop, Claude Code & Cursor
Run in your terminal:
claude mcp add lexilint-mcp -- npx FAQ
Is LexiLint MCP free?
Yes, LexiLint MCP is free — one-click install via Unyly at no cost.
Does LexiLint need an API key?
No, LexiLint runs without API keys or environment variables.
Is LexiLint hosted or self-hosted?
A hosted option is available: Unyly runs the server in the cloud, no local setup required.
How do I install LexiLint in Claude Desktop, Claude Code or Cursor?
Open LexiLint on unyly.org, pick your client tab (Claude Desktop, Claude Code, Cursor) and press Install — the config is generated automatically, no JSON editing.
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