OpenReview

A native git diff viewer with AI-powered code review via MCP. Open any repository, browse staged and unstaged changes, and let Claude (or any MCP-compatible AI) leave inline comments directly in the UI.

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Features

• Git diff viewer — staged and unstaged changes side by side, syntax highlighted, virtualised for large diffs
• Inline comments — click any diff line to annotate it; comments survive refreshes until the line disappears
• File tree sidebar — collapse/expand files, see addition/deletion counts at a glance
• Copy review — export all comments as plain text (file path + line + text) for pasting into PRs or tickets
• MCP server — full Model Context Protocol server running locally at http://127.0.0.1:27182/mcp; connect Claude Desktop, Cursor, or any MCP client and let the AI read the diff and post comments without leaving your editor

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Getting started

npm install
npm run dev

Click open in the toolbar to pick a git repository. The MCP server starts automatically alongside the app.

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MCP setup

The app exposes an MCP server on http://127.0.0.1:27182/mcp (Streamable HTTP transport). Click mcp url in the toolbar to copy the URL to your clipboard.

Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "openreview": {
      "url": "http://127.0.0.1:27182/mcp"
    }
  }
}

Cursor

Add to .cursor/mcp.json in your project (or globally in ~/.cursor/mcp.json):

{
  "mcpServers": {
    "openreview": {
      "url": "http://127.0.0.1:27182/mcp"
    }
  }
}

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MCP capabilities

Tools

Tool	Description
get_comments	Returns all review comments. Optional filePath filter.
add_comment	Adds an inline comment to a diff line by lineRef.
update_comment	Edits the text of an existing comment by id.
delete_comment	Removes a comment by id.

Resources

URI	Description
comments://all	Live snapshot of all current comments (subscribable).

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Tech stack

Electron · React · Zustand · Tailwind CSS · Shiki · @modelcontextprotocol/sdk