This is a delightful little find for anyone working with Claude Code and markdown-heavy workflows. annotate-skill is a self-contained Claude Code skill that generates a Tufte-styled HTML review surface for marking up markdown documents with inline suggestions, comments, and deletions.

If you've spent any time editing prose, technical documentation, or AI-generated drafts, you know that markdown's plain-text nature makes collaborative review awkward. GitHub PRs work for code, but reviewing a long-form document — adding margin notes, suggesting deletions, leaving questions — is genuinely painful. This skill solves that by rendering a beautiful, Edward Tufte–inspired side-margin annotation surface right in HTML.

What makes it interesting:

• Self-contained output — no server, no dependencies, just an HTML file you can share or commit alongside the source.
• Tufte styling — sidenotes and margin notes are a natural fit for review comments, and the typography signals "thoughtful editorial work" rather than "JIRA ticket."
• Skill-shaped — it's packaged as a Claude Code skill, meaning Claude can invoke it on demand to produce review surfaces from any markdown file in your project.
• Composable workflow — pairs naturally with AI-assisted writing: draft in markdown, have Claude annotate, review the HTML, accept or reject changes.

Who would find this useful:

• Technical writers who want a lightweight review loop without dragging documents into Google Docs.
• Bloggers and essayists using Claude as an editor and wanting to see suggested edits in context.
• Skill authors looking at a clean reference for how to ship a focused, presentation-layer Claude Code skill.

It's a small, opinionated tool that does one thing well — exactly the kind of thing that tends to get buried under flashier repos. Worth a star and a try.