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Automattic/harper

Automattic / harper

Dev Agents & ProgramsRustApache-2.0
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Offline, privacy-first grammar checker. Fast, open-source, Rust-powered

16.1kstars
697forks
964open issues
2026-10-01last pushed
Apache-2.0license

What it is, and how people use it

Offline, privacy-first grammar checker. Fast, open-source, Rust-powered It sits on the Dev Agents & Programs shelf of the catalog, maintained by @Automattic.

✓Drop-in for Claude Code, Codex CLI and Cursor - install and it just runs.
✓Read the SKILL.md / README first; most setups are one command from the docs.
✓Teams use it to standardise how agents behave across every repo in the org.
chrome-extensiondeveloper-toolsenglish-languagegrammar-checkernodejs
writewithharper.com

Why builders keep it installedDev Agents & Programs benefits

Day-one leverage

These CLIs and dashboards solve one job well and install with a single command. Value shows up in the first hour, not after a config weekend.

Composes with your agent

Most of them ship an MCP server, skill or hooks - so the same tool you use manually becomes an action your agent can call safely.

Built under real workloads

Star counts here track repos people actually run daily: the issue history shows bug classes fixed under production pressure, not demo-week polish.

Free and open source

Every tool on this page ships under an open license and can be self-hosted. Your usage data and your configs stay yours.

Contributorsloading from GitHub…

AUAutomdev1337AUAutomdev2303AUAutomdev3269AUAutomdev4236AUAutomdev5202AUAutomdev6168AUAutomdev7135AUAutomdev8101

Languagesestimated from snapshot

  • Rust 81.0%
  • Shell 12.0%
  • Go 7.0%

Community pulsesnapshot ratios, normalized

starsforksissues ×3watchers