Split-pane preview.
You have tried a dozen browser Markdown editors, and they all want something: your email, a login, a subscription for the export button, or they quietly go offline and take your drafts with them. Writing Markdown is a solved problem that keeps getting re-monetized. A textarea, a preview pane, and a bit of syntax highlighting do not need a SaaS account. This blueprint builds the editor and puts it in your repository, so it works offline, keeps your drafts local, and never asks you to sign in to your own notes.
A browser-based Markdown editor with a live split-pane preview: you type on the left, formatted output updates on the right as you go. It includes syntax highlighting in the editor pane, automatic saving to local storage so a refresh or a closed tab never costs you a draft, and a "Copy HTML" button that hands you clean markup ready to paste into a CMS or an email.
You watch it happen in the task workspace: the agent scaffolds the project, wires the live preview and auto-save, checks the panes render and the copy button works, and hands you a live preview. The code lands on a branch in your repository with a pull request ready.
The first version is a base you steer with plain follow-up messages:
Each follow-up wakes the same repository and the agent continues on its own code.
Do I need to know how to code? No. You describe the editor you want; the agent builds it, verifies the preview and auto-save work, and ships the code to your repository.
Where are my drafts stored? In your browser's local storage, on your machine. Nothing is uploaded, and it keeps working offline.
Can I host it myself? Yes. It is your code, so deploy it anywhere or just open the file locally.