Check grammar, style, and spelling across 25+ languages with LanguageTool. This open-source proofreading engine can run as a local Java server or via its public API, providing detailed error reports with correction suggestions for any text content.
Scanned 6/8/2026
Install via CLI
openskills install agentskillexchange/skills---
name: "LanguageTool Grammar and Style Checker"
slug: "languagetool-grammar-style-checker"
description: "Check grammar, style, and spelling across 25+ languages with LanguageTool. This open-source proofreading engine can run as a local Java server or via its public API, providing detailed error reports with correction suggestions for any text content."
github_stars: 14238
verification: "security_reviewed"
source: "https://github.com/languagetool-org/languagetool"
category: "Content Writing & SEO"
framework: "Multi-Framework"
tool_ecosystem:
github_repo: "languagetool-org/languagetool"
github_stars: 14238
---
# LanguageTool Grammar and Style Checker
Check grammar, style, and spelling across 25+ languages with LanguageTool. This open-source proofreading engine can run as a local Java server or via its public API, providing detailed error reports with correction suggestions for any text content.
## Installation
Use the upstream install or setup path that matches your environment:
- git clone --depth 5 https://github.com/languagetool-org/languagetool.git
- Install Brew for Rosetta:
Requirements and caveats from upstream:
- ## Docker
- Try one of the following projects for a community-contributed Docker file:
- github.com | hub.docker.com/r
Basic usage or getting-started notes:
- [How to run your own LanguageTool server](https://dev.languagetool.org/http-server)
- If you wish to have more options, download the install.sh script. Usage options follow:
- Options:
- Source: https://github.com/languagetool-org/languagetool
- Extracted from upstream docs: https://raw.githubusercontent.com/languagetool-org/languagetool/HEAD/README.md
## Source
- [Agent Skill Exchange](https://agentskillexchange.com/skills/languagetool-grammar-style-checker/)
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Ultra-compressed communication mode. Cuts token usage ~75% by speaking like caveman while keeping full technical accuracy. Supports intensity levels: lite, full (default), ultra, wenyan-lite, wenyan-full, wenyan-ultra. Use when user says "caveman mode", "talk like caveman", "use caveman", "less tokens", "be brief", or invokes /caveman. Also auto-triggers when token efficiency is requested.