VS Code Extension

Annotate the plan.
Before you write
a single line.

Redline Mark brings inline, line-level review to any Claude-generated document — implementation plans, specs, RFCs — directly in VS Code. Comment, refine, send back.

Install Extension See how it works

Free · Works with Claude Code · No GitHub required

auth-implementation.md

1# Auth Implementation Plan

3## Overview

4The API will use token-based auth.

5 Users authenticate via /auth/login

you question · just now

JWT or session tokens? Need to decide before we touch the DB schema.

6Tokens stored in localStorage.

7 Rate limiting: handled at infra level.

⚠

claude warning

No rate limiting defined in this plan. Recommend explicit limits per endpoint.

9## Endpoints

10POST /auth/login → returns token

How it works

Three steps.
Zero friction.

From generated document to refined plan — without leaving your editor or switching context.

Open any doc

Claude generates a plan in your terminal or chat. Run /redline plans/auth.md or click the link in Claude.ai. The file opens instantly in VS Code review mode.

Annotate inline

Click any line to leave a comment. Mark severity as info, question, warning, or blocker. Thread replies. Resolve when done.

Send to Claude

Hit Send to Claude in the sidebar. Choose to revise the plan, open a conversation, or generate a new parallel version. Claude processes your annotations.

Features

Built for the
document layer.

Line-level comment threads

Uses VS Code's native Comment Thread API — the same one GitHub PR reviews use. Threads, replies, resolve states. No custom UI to learn.

Smart anchor repair

When Claude revises a file, line numbers shift. Redline Mark's 4-tier anchor engine finds where your comment moved — hash match, context match, fuzzy search — and repairs automatically.

Any markdown file

Not just code. Not just PRs. Implementation plans, specs, RFCs, design docs — if it's a .md file in .claude/, you can review it.

Two entry points, one experience

Trigger from Claude Code terminal with /redline, or click a link straight from Claude.ai chat. Both open the same VS Code review interface via a vscode:// URI handler.

Three feedback modes

Tell Claude how to handle your comments: Revise the plan in place, Converse about the issues in chat, or create a clean New Version alongside the original.

Persistent review history

All comments are stored as JSON in .claude/reviews/. Gitignore them or commit them — your choice. Review state survives restarts, file edits, and Claude revisions.

Compare

Not code review.
Document review.

Claude Code's built-in review is powerful — for GitHub PRs on Teams/Enterprise. Redline Mark is for every developer reviewing every document Claude writes.

Capability	Claude Code Review	Redline Mark
Inline line comments	✓ GitHub only	✓ Any file
Works on .md docs	✗	✓
Human annotates back	✗	✓
Local / offline	✗	✓
Free for individuals	✗ $15–25/review	✓ Always free
Requires GitHub	Required	Not needed
Sends feedback to Claude	✗	✓ 3 modes

Install

Up in 60 seconds.

Install from the VS Code marketplace, open any .claude/ markdown file, and start annotating.

VS Code Command Palette

> ext install redline-mark

Or via CLI

$ code --install-extension redline-mark

Requires VS Code 1.85+ · Claude Code optional but recommended · MIT License

Annotate the plan.Before you writea single line.

Three steps.Zero friction.