Observed arrival · 2026-09-23
Couplet gives AI agents a live Markdown notebook
A free, open-source macOS Markdown editor that lets coding agents navigate, edit, and ask questions inside an open document.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- macOS users coordinating coding agents through Markdown files
- Worth noticing
- Agent edits are diffed into the live buffer, highlighted, and remain ordinary undo steps; ⌘Z rejects them.
Field notes
The listed editor features include inline Mermaid diagrams, draggable GFM table rows and columns, collapsible headings, and masking for secrets in .env and shell configuration files. The page describes agent access as a one-time MCP server registration to a local socket, without a daemon or cloud service. It also says comments on document fragments can wake the agent, and identifies Claude Code as the best fit.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue