LexiLint MCP — Offline Spell Check & BYOK Grammar for AI Assista…

Name: LexiLint MCP — Offline Spell Check & BYOK Grammar for AI Assistants
Author: raunakkathuria

@raunakkathuria

About LexiLint MCP — Offline Spell Check & BYOK Grammar for AI Assista…

Spell and grammar checking for AI assistants via Model Context Protocol. 100% offline spell check (zero tokens, zero API calls) using nspell. BYOK grammar checking with your own Gemini, OpenAI, or Claude API key. Works with Claude Desktop, Cursor, ChatGPT, and any MCP-compatible

#spell-check #grammar #privacy #offline #byok #writing #productivity

Config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "lexilint": {
      "command": "npx",
      "args": [
        "-y",
        "lexilint-mcp"
      ]
    }
  }
}

Tools

Check text for spelling errors. 100% offline — no API key needed. Supports en-US and en-GB.

Check text for grammar, style, and clarity issues. Free with Google Gemini (BYOK — get a free key at aistudio.google.com). OpenAI and Anthropic require LexiLint Premium.

Run spell check and optionally grammar check. Spell check (en-US/en-GB) is free and offline. Grammar with Gemini is free (BYOK). Multi-language and OpenAI/Anthropic require LexiLint Premium.

Overview

What is LexiLint MCP?

LexiLint MCP provides spell and grammar checking for AI assistants via the Model Context Protocol. It offers 100% offline spell check using nspell and a bring-your-own-key (BYOK) grammar check with support for Gemini, OpenAI, or Anthropic Claude. It is designed for developers and users who want to reduce token waste on typo detection and keep grammar data private.

How to use LexiLint MCP?

Install by adding the server configuration to your mcpServers JSON object with the command npx -y lexilint-mcp. After configuration, the assistant can perform offline spell checks and grammar checks using your own API key.

Key features of LexiLint MCP

Offline spell check with zero token consumption.
BYOK grammar check using Gemini, OpenAI, or Anthropic Claude.
Supports 8 languages: English (US/UK), Spanish, French, German, Polish, Russian, Turkish.
Works without internet for spell checking.
No API calls or recurring costs for spell check.

Use cases of LexiLint MCP

Reduce AI token costs by handling spell checks locally.
Grammar-check sensitive text without sending data to third-party services.
Support multilingual AI assistants with offline spelling correction.
Enable spell and grammar checking in air-gapped or low-connectivity environments

Comments

Basic information

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