Redline

Review mode for LLM-generated plans.

LLMs write plans and specs as markdown. Reviewing them in chat is imprecise — you end up quoting passages by hand, losing context, or just saying "looks good" when it doesn't. Redline gives you a Google Docs-style commenting experience on any .md file so you can leave anchored, passage-level feedback. When you're done, copy all your comments in one click and paste them back into the LLM.

The loop: LLM writes a plan → you review it in Redline → your feedback goes back to the LLM.

Inspired by Agentation.

Quickstart

npx @btn0s/redline ./plan.md

Redline starts a local server on port 4700 and opens the review UI in your browser.

Install

npm i -g @btn0s/redline

Or run directly with npx / pnpm dlx — no install required.

How it works

1. Select text in the rendered markdown to start a comment thread
2. Leave comments anchored to the exact passage — replies are threaded
3. Copy all — one click copies every comment as structured text, ready to paste back into your LLM conversation

Comments persist to disk alongside the markdown so you can close and come back.

Agent skill

Redline ships an agent skill so AI coding assistants (Cursor, Claude Code, Codex, etc.) can open the review UI on your behalf when a plan or spec needs your sign-off.

npx skills add btn0s/redline --skill redline

The agent writes a plan, launches Redline, and waits for your feedback — no copy-pasting commands.

Development

pnpm install
pnpm dev

License

MIT