harn open

harn open <url> [--dry-run]

harn open opens an http or https address in the operating system’s default browser and returns at once. Nothing is attached to the browser, so the page opens in the person’s own browser with their own sign-ins, exactly as if they had clicked the link.

Agents deliver a page as a link and open it only when the person asks to see it (“show me” counts). Agent apps launch browsers in different ways, and some approval reviews refuse a bare shell launch of an address, so this one command gives every adapter the same path. The harn-computer skill routes to it.

Host	How it opens
Windows	The URL protocol handler (rundll32.exe url.dll,FileProtocolHandler), which takes the whole address as one argument
WSL	The same handler on the Windows host, so the page opens in the Windows default browser
macOS	open
Linux desktop	xdg-open

Any address that is not http or https, such as file: or javascript:, is refused with exit 1. --dry-run prints the command it would run and opens nothing.

harn open "https://example.com/search?q=manufacturing&state=MN"
harn open --dry-run https://example.com