Fabrizio Rinaldi, founder of Typefully, has released Cogito, a native macOS Markdown editor built to work with AI agents. The app stores everything as plain Markdown files on disk. No database or proprietary format. No sync service getting in the way. Any script or agent can read and write your notes directly, and changes show up instantly in the editor.
Most writing tools lock your content in databases or cloud services. Cogito does the opposite. Your file system is the source of truth. If an agent creates or edits a Markdown file in your working directory, you see it in real time. The editor also supports wiki links and Obsidian-style embeds, so it fits into existing personal knowledge management setups.
Rinaldi is building Cogito as a side project while focusing on Typefully, his Twitter management platform for creators. The editor is free during beta, with pricing to be determined later.
It requires macOS Tahoe 26, which limits the potential user base for now. But for developers already running Apple's latest OS and working with coding agents, Cogito addresses a real friction point: the gap between what your agents write and what you can actually see and edit.
The app includes syntax highlighting for over 20 languages, tabbed editing, Quick Open for file search, and synced scrolling between source and preview. It uses the iA Writer Quattro typeface and ships with hand-tuned color palettes for light and dark modes. Agents write to files on disk. You see the changes. That's the whole idea.