📦

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

🔒 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

License

MIT