C411 MCP Server

An MCP (Model Context Protocol) server for searching torrents on c411.org, fetching torrent metadata and comments, and downloading .torrent files.

Table of Contents

• Features

• Installation

• Usage

  • Running the server

  • Authentication

  • Auth failure behavior

  • MCP Client Configuration

• Tools

  • search_c411

  • get_c411_torrent_info

  • get_c411_torrent_comments

  • download_c411_torrent

• Project structure

• Development

• Notes

Related MCP server: RuTracker MCP Server

Features

• Search torrents on c411.org

• Get detailed torrent metadata by infoHash

• Get paginated torrent comments by infoHash

• Download .torrent files by infoHash

• Reuse authenticated sessions automatically

• Retry expired auth with a small delay and bounded retry count

• Distinguish missing credentials, invalid credentials, and maintenance-mode failures

• Return structured search results with titles, sizes, seed counts, and infoHash when available

Installation

npm install

Usage

Running the server

The server uses stdio transport by default:

npm run dev

Or build and run:

npm run build
npm start

Authentication

C411.org requires authentication to access torrent listings. To enable login:

1. Set the following environment variables:

   • C411_USERNAME: Your c411.org username

   • C411_PASSWORD: Your c411.org password

2. The server will automatically log in and maintain the session.

Without credentials, the server may not be able to retrieve search results.

Auth failure behavior

The server tries to return a more specific error when authentication fails:

• Missing credentials: asks for C411_USERNAME and C411_PASSWORD

• Invalid credentials: reports that the username/password were rejected

• Maintenance mode: reports that c411.org is temporarily unavailable

• Network or timeout issues: returns a sanitized transport error without logging credentials

HTTP requests time out after 10 seconds.

MCP Client Configuration

To use this server with an MCP client (like Claude Desktop), add to your client configuration:

{
  "mcpServers": {
    "c411": {
      "command": "node",
      "args": ["/path/to/c411-mcp-server/build/index.js"],
      "env": {
        "C411_USERNAME": "your_username",
        "C411_PASSWORD": "your_password"
      }
    }
  }
}

For OpenCode, configure the server in your OpenCode config under mcp using a local MCP entry:

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "c411": {
      "type": "local",
      "command": ["node", "/path/to/c411-mcp-server/build/index.js"],
      "enabled": true,
      "environment": {
        "C411_USERNAME": "your_username",
        "C411_PASSWORD": "your_password"
      }
    }
  }
}

OpenCode documents MCP servers under the mcp key, with local servers using type: "local", a command array, and environment for env vars.

You can also add it from the OpenCode CLI:

opencode mcp add

Then choose a local MCP server and enter the equivalent values:

• name: c411

• type: local

• command: node /path/to/c411-mcp-server/build/index.js

• environment:

  • C411_USERNAME=your_username

  • C411_PASSWORD=your_password

Afterward, you can verify it was added with:

opencode mcp list

Tools

search_c411

Search for torrents on c411.org.

Parameters:

• query (string, required): Search query, trimmed, 1 to 200 characters

• category (string, optional): Category filter. One of 1, 2, 3, 4, 5, 6, 7, 10.

• subcat (string, optional): Sub-category filter. Only valid when category is 1.

• sortBy (string, optional): Sort criteria. One of relevance, seeders, leechers, size, createdAt, name, completions, comments, category. Defaults to relevance.

• sortOrder (string, optional): Sort order. One of asc, desc. Defaults to desc.

• page (number, optional): Result page number. Defaults to 1.

• perPage (number, optional): Number of results per page. Defaults to 25, maximum 100.

Returns: List of torrent results with titles, sizes, seed counts, and infoHash when available.

list_my_c411_uploads

List torrents uploaded by the current authenticated c411.org user.

Parameters:

• query (string, optional): Search query, trimmed, 1 to 200 characters.

• category (string, optional): Category filter. One of 1, 2, 3, 4, 5, 6, 7, 10.

• subcat (string, optional): Sub-category filter. Only valid when category is 1.

• sortBy (string, optional): Sort criteria. One of relevance, seeders, leechers, size, createdAt, name, completions, comments, category. Defaults to relevance.

• sortOrder (string, optional): Sort order. One of asc, desc. Defaults to desc.

• page (number, optional): Result page number. Defaults to 1.

• perPage (number, optional): Number of results per page. Defaults to 100, maximum 100.

Returns: List of torrent results for the current user's uploads, using the same structure as search_c411.

get_c411_torrent_info

Get detailed metadata for a torrent on c411.org.

Parameters:

• infoHash (string, required): The 40-character hex infoHash of the torrent

Returns: Structured torrent metadata including title, category, size, seeder and leecher counts, completion count, uploader, creation date, file list, TMDB data when available, and trust information.

get_c411_torrent_comments

Get paginated comments for a torrent on c411.org.

Parameters:

• infoHash (string, required): The 40-character hex infoHash of the torrent

• page (number, optional): Comment page number. Defaults to 1.

• limit (number, optional): Number of comments per page. Defaults to 20, maximum 100.

Returns: Structured comment results with pagination metadata and normalized comment entries, including HTML content, plain-text content, author info, timestamps, and reply targets when present.

download_c411_torrent

Download a .torrent file from c411.org and save it to disk.

Parameters:

• infoHash (string, required): The 40-character hex infoHash of the torrent

• outputDir (string, optional): Directory where the .torrent file should be saved. Defaults to /tmp.

Returns: The full path of the saved .torrent file.

Example:

infoHash: "178a3516f248e45f9857abbc2cbc8a8b20f29815"
outputDir: "/tmp"

Project structure

• src/index.ts: bootstrap only; creates the MCP server and starts stdio

• src/c411-client.ts: c411 auth, retries, search, torrent info, comments, and download logic

• src/register-tools.ts: MCP tool registration

• src/formatters.ts: formatting and normalization helpers for search, torrent info, and comments

• src/http-response-utils.ts: response parsing and maintenance detection helpers

• src/http-client.ts: isolated Axios + cookie-jar setup

• src/schemas.ts: Zod tool schemas

• src/types.ts: shared TypeScript types

Development

• npm run dev: Run in development mode with hot reload

• npm run build: Compile TypeScript to JavaScript

• npm start: Run the compiled server

Notes

• This server is for personal use only

• Respect c411.org's terms of service

• Keep your credentials secure

• The scraper may need updates if the website structure changes