Offline spell checker + BYOK grammar for AI assistants. Works with Claude Desktop, ChatGPT, Cursor.
Connect Runs on your machine
claude mcp add lexilint -e GEMINI_API_KEY=<GEMINI_API_KEY> -e OPENAI_API_KEY=<OPENAI_API_KEY> -e ANTHROPIC_API_KEY=<ANTHROPIC_API_KEY> -- npx -y [email protected]{
"mcpServers": {
"lexilint": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"GEMINI_API_KEY": "<GEMINI_API_KEY>",
"OPENAI_API_KEY": "<OPENAI_API_KEY>",
"ANTHROPIC_API_KEY": "<ANTHROPIC_API_KEY>"
}
}
}
}{
"mcpServers": {
"lexilint": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"GEMINI_API_KEY": "<GEMINI_API_KEY>",
"OPENAI_API_KEY": "<OPENAI_API_KEY>",
"ANTHROPIC_API_KEY": "<ANTHROPIC_API_KEY>"
}
}
}
}{
"servers": {
"lexilint": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"GEMINI_API_KEY": "<GEMINI_API_KEY>",
"OPENAI_API_KEY": "<OPENAI_API_KEY>",
"ANTHROPIC_API_KEY": "<ANTHROPIC_API_KEY>"
}
}
}
}Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
GEMINI_API_KEYOptional, secret | Google Gemini API key for grammar checking; optional when api_key is supplied per call. |
OPENAI_API_KEYOptional, secret | OpenAI API key for Premium grammar checking; optional when api_key is supplied per call. |
ANTHROPIC_API_KEYOptional, secret | Anthropic API key for Premium grammar checking; optional when api_key is supplied per call. |
Details
| Package | [email protected] (NPM, stdio) |
| First published | 3 Oct 2026 |
| Last updated | 3 Oct 2026 |
| Registry name | io.github.raunakkathuria/lexilint |
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