Sounds right. Is it real?

step 1 of 3

Install the browser extension

Works today in Chrome, Edge, Brave - any Chromium browser. Live on the Chrome Web Store:

Add to Chrome - free

Prefer to run from source instead?

1. Clone the repo: git clone https://github.com/multimodeai/ground-truth.git
2. Open chrome://extensions (or edge://extensions, brave://extensions)
3. Toggle Developer mode on, top right
4. Click Load unpacked
5. Select the repo’s extension/ folder

Also works without any of the seven supported sites: select any text on any page, right-click, choose “Check with Ground Truth” - or paste text directly into the toolbar popup.

step 2 of 3 · optional, or alongside step 1

Install the MCP server

Building with an agent instead of (or alongside) a browser? The MCP server exposes the exact same checking engine as a tool any MCP-compatible client can call on its own drafted answer, before a citation ever reaches you.

1. Already on npm as @hududed/ground-truth-mcp - no clone needed:

   npx -y @hududed/ground-truth-mcp

2. Claude Code, one line:

   claude mcp add ground-truth -- npx -y @hududed/ground-truth-mcp

3. Claude Desktop - add this to your config (~/Library/Application Support/Claude/claude_desktop_config.json on macOS):

   {
     "mcpServers": {
       "ground-truth": {
         "command": "npx",
         "args": ["-y", "@hududed/ground-truth-mcp"]
       }
     }
   }

4. Restart Claude Desktop (or reload Claude Code) - it’s live.

Working from a local checkout instead of the published package? Point command at node /absolute/path/to/ground-truth/mcp-server/server.js. To verify it yourself against the real MCP transport: cd mcp-server && npm install && node test.js.

step 3 of 3

Try it

However you installed it, the test is the same: give an AI a reason to cite a verse, then watch what happens.