BCD

Command-line tools › H

Run harper from ChatGPT or Claude

Grammar Checker for Developers. With BCD, ChatGPT, Claude and other AI apps can install and run harper on your own computer and read what it prints.

Works on

About harper

Version
3.1.0
License
Apache-2.0
Installs (last 365 days)
7,279 · #999 in Homebrew
Homepage
writewithharper.com
Install
brew install harper

Try asking

“Install harper with Homebrew and show me its version”
“Read harper --help and give me three useful examples for my files”
“Update harper and tell me what changed”

Questions

Can ChatGPT run harper on my computer?
Yes. With BCD on your Mac or Linux computer and command permission turned on for it, ChatGPT runs harper there and reads the output. Claude and other apps with MCP connectors can too.

Do I need to install harper first?
No. If Homebrew is installed, the AI can run brew install harper for you.

Is it safe?
A new computer starts read-only: running commands is turned on per computer, and BCD reaches only the folders you allow.

Try it on your computer

BCD connects ChatGPT, Claude and other AI apps to your own Mac, Windows or Linux computer. One computer is free, with 20,000 tool calls a month and no card.

Program data from Homebrew, updated 2026-11-11. Installs are Homebrew's installs on request over the last 365 days.