mhr shows a markdown file in a native window and re-renders it every time the file changes on disk. Your scroll position stays where it was. There is no editing surface, and mhr never writes to the file it opens.

It is built for reading files you did not write, such as a plan produced by an AI agent or a README from a repository you just cloned:

• No network access. The window blocks every outgoing request, so a document renders the same way with the network disconnected.
• No server and no port. Most markdown previewers render to a localhost page that any other process on the machine can read. mhr opens a window instead.
• Raw HTML inside a document is displayed as text, never executed.

It renders GitHub Flavored Markdown, including tables, task lists, footnotes and alerts, plus syntax-highlighted code blocks, math converted to MathML, Mermaid diagrams and front matter. Images do not display, because mhr reads only the single file you name.

• Open a file from a terminal with: mhr notes.md
• Or right-click a markdown file in your file manager and choose mhr from the "Open With" menu.