# Harper Offline Privacy-First Grammar Checker by Automattic

> Harper is an offline, privacy-first grammar checker written in Rust by Automattic. It runs locally with sub-10ms response times, supports LSP for editor integration, compiles to WebAssembly for browser use, and provides grammar, spelling, and style checking without sending text to external servers.

- Skill: `agentskillexchange/harper-offline-privacy-first-grammar-checker-by-automattic` (Agent Skill)
- Install (CLI): `npx skillmds@latest add agentskillexchange/harper-offline-privacy-first-grammar-checker-by-automattic`
- Raw SKILL.md: https://api.skillmd.com/api/skills/agentskillexchange/harper-offline-privacy-first-grammar-checker-by-automattic/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Integrations & APIs
- Author: agentskillexchange (https://skillmd.com/u/agentskillexchange)
- Updated: 2026-09-08
- Page: https://skillmd.com/skills/agentskillexchange/harper-offline-privacy-first-grammar-checker-by-automattic

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# Harper Offline Privacy-First Grammar Checker by Automattic

Harper is an offline, privacy-first grammar checker written in Rust by Automattic. It runs locally with sub-10ms response times, supports LSP for editor integration, compiles to WebAssembly for browser use, and provides grammar, spelling, and style checking without sending text to external servers.

## Installation

No source-backed install or usage instructions could be extracted automatically. Review the upstream project before running this skill in a sensitive workflow.

- Source: https://github.com/Automattic/harper

## Source

- [Agent Skill Exchange](https://agentskillexchange.com/skills/harper-offline-grammar-checker-automattic/)