Redline — Redline Your AI's Code Before It Ships

Redline is a VS Code extension that brings a structured, intuitive, and automated code review process to AI-generated code. Instead of fragmented feedback, review changes like a real GitHub Pull Request — with inline comments, file-level tracking, and an AI-powered fix loop that works natively in your IDE's chat.

📺 Demo

Watch the Redline demo

🚀 Key Features

• GitHub-Style Sidebar — See all changed files at a glance with status icons (Added, Modified, Deleted, Renamed) and line stats.
• Side-by-Side Diffs — Native VS Code diff experience for every changed file.
• Inline Commenting — Add comments directly on code lines with a dedicated severity picker:
  • 🔴 Must Fix — Blockers that must be resolved
  • 🟡 Suggestion — Best practices and improvements
  • 🔵 Nitpick — Styling and minor issues
  • ❓ Question — Clarification needed
• Review Tracking — Mark files as "Reviewed ✓" as you go. They sort to the bottom automatically.
• TOML Export — Generates structured, AI-readable review results in .redline/latest.toml.
• @redline Chat Participant — Integrated AI assistant with /fix and /review commands that work directly in your IDE's chat panel.
• ⚡ Auto-Fix — Click "Submit & Auto-Fix" to open @redline /fix in the chat, where the AI reads your review and applies all fixes.
• History — Browse and revisit past review cycles.

🤖 @redline Chat Participant

Redline registers a native chat participant that works directly in your IDE's chat panel. No clipboard hacks, no terminal commands — it talks to the LLM natively.

Commands

How it works

1. You submit a review (with or without "Auto-Fix")
2. The review is saved to .redline/latest.toml
3. Typing @redline /fix in chat sends the full TOML to the LLM with structured instructions
4. The AI streams back the exact code changes needed, file by file

Supported IDEs

The chat participant uses the VS Code Chat Participant API (stable since VS Code 1.93), which is supported by:

• ✅ VS Code (with GitHub Copilot Chat)
• ✅ Cursor
• ✅ Antigravity
• ✅ Windsurf
• ✅ Any VS Code fork that supports the Chat Participant API

🛠️ Installation

From VSIX

code --install-extension redline-0.1.0.vsix

Or use the "Extensions: Install from VSIX..." command in VS Code.

Requirements

• VS Code 1.93+ (or compatible fork like Cursor, Antigravity, Windsurf)
• A chat-capable AI extension (e.g. GitHub Copilot Chat, or the built-in AI of your IDE)

📖 Usage Guide

1. Start a Review

• Press Ctrl+Shift+R or run "Redline: Start Review" from the command palette.
• Pick a commit to review — the extension shows all changes introduced by that commit.

2. Review Files

• Select files from the Redline sidebar to open the diff view.
• Click the + icon on any line to add an inline comment.
• Choose a severity level and type your feedback.
• Use Alt+Shift+R to mark a file as reviewed.

3. Submit Review

• Press Ctrl+Shift+S to open the Submit Review panel.
• See your review stats at a glance — files reviewed, comment counts by severity, and a progress bar.
• Write a summary, choose a decision (Approve / Comment / Request Changes).
• Click Submit Review or ⚡ Submit & Auto-Fix.

4. Auto-Fix with AI

When you click ⚡ Submit & Auto-Fix:

1. The review is saved to .redline/latest.toml
2. The chat panel opens with @redline /fix pre-populated
3. The @redline participant reads the TOML and sends it to the LLM
4. The AI streams back actionable code fixes

You can also use @redline /fix manually at any time — it always reads the latest review file.

⌨️ Keyboard Shortcuts

🤖 AI Agent Integration

The extension outputs structured state in TOML format for any AI agent to consume.

Example .redline/latest.toml:

[review]
decision = "request_changes"
summary = "Fix error handling and use design tokens"

[[comments]]
file = "src/utils/parser.ts"
line = 42
severity = "must_fix"
body = "Add null check before accessing .length"
codeContext = "const len = input.length;"
resolved = false

[[reviewedFiles]]
path = "src/utils/parser.ts"
status = "modified"
reviewed = true

Using @redline /fix (Recommended)

The easiest way to auto-fix is through the chat participant:

@redline /fix

The AI reads .redline/latest.toml automatically and applies all fixes. You can add extra instructions too:

@redline /fix Only fix the must_fix items, skip suggestions

Using a custom script (Advanced)

If you prefer a script-based workflow, set redline.autoFixCommand in settings and add the script to your project:

"scripts": {
  "redline:fix": "your-custom-fix-script"
}

⚙️ Configuration

📋 Changelog

• Latest: 0.2.3 (2026-02-25) — Unified Git Status mode, live line metrics, and improved auto-fix workflow.

See CHANGELOG.md for the full release history.

License

MIT

Built for developers who want to trust AI code, but verify it properly.