Reduck

Official

Remote MCP server that lets agents discover, run and create browser automation scripts as tools. Scripts run in your own Chrome through an extension, so they work behind your logins without exposing credentials.

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Reduck gives AI agents a faster, more reliable way to use websites that have no API. Instead of having the model click through a browser step by step, Reduck exposes deterministic browser automation scripts as MCP tools with clear inputs and outputs. Running a script returns the same structured result every time, in milliseconds, without spending tokens on each step.

Scripts run in your own Chrome through the Reduck extension, so the agent works where you are already logged in. Credentials never leave your machine, and the scripts use your own browser fingerprint and IP. Agents can use Reduck's official script library, found with list_scripts, or ask Reduck to build new scripts for a site such as an internal ERP or a government portal. When a site changes and a script breaks, Reduck can re-run its agent to repair it. Scripts can run in parallel and can upload files.

The remote server uses Streamable HTTP with OAuth and works with Claude, Codex, ChatGPT, Cursor, Google Antigravity, n8n and other MCP clients. Reduck also offers a CLI and a REST API, and it is listed in the Official MCP Registry as ai.reduck/reduck.

What You Can Do

Download missing monthly invoices from several vendor portals in one pass.

Find LinkedIn posts in your market and shortlist the people who engaged with them.

Track posts and accounts driving a topic on X without an API key.

Search Amazon listings and read recent reviews before choosing a product.

Build a reusable script for an internal tool or portal that has no API.

Setup Guide

Create an account at https://reduck.ai/

Install the Reduck browser extension and pair it with your account

Claude Code: claude mcp add reduck --transport http --scope user https://mcp.reduck.ai

Codex: codex mcp add reduck --url https://mcp.reduck.ai

Other clients: add the remote server (registry URL https://mcp.reduck.ai/mcp, Streamable HTTP, OAuth); see docs.reduck.ai for per-client steps

Start a new session and ask the agent to run one of Reduck's official scripts

How to Connect in Antigravity

To connect to a custom MCP server in Antigravity:

Open the MCP store via the "..." dropdown at the top of the editor's agent panel.

Click on "Manage MCP Servers"

Click on "View raw config"

Modify the mcp_config.json with your custom MCP server configuration.

Here is an example configuration compatible with MCP-enabled editors like Antigravity, Windsurf, Claude Desktop, and Cursor:

{
  "mcpServers": {
    "supabase-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@supabase/mcp-server-supabase@latest",
        "--access-token",
        "add-token-here"
      ],
      "env": {}
    },
    "github-mcp-server": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "GITHUB_PERSONAL_ACCESS_TOKEN",
        "ghcr.io/github/github-mcp-server"
      ],
      "env": {
        "GITHUB_PERSONAL_ACCESS_TOKEN": "add-your-token-here"
      }
    }
  }
}

This configuration defines two servers: one running via npx (Supabase) and another via docker (GitHub). Make sure to replace the placeholder tokens with your actual API keys.

For a detailed step-by-step walkthrough, check out our MCP Tutorial or explore more in our Top 10 Essential MCP Servers guide.