dtrpg-mcp

An MCP server that lets an LLM search your DriveThruRPG library and the public DriveThruRPG catalog for tabletop RPG products, returning structured details (title, description, publisher, authors, game system, and DriveThruRPG product id) for each match.

It speaks MCP over stdio and exposes two tools: search_library (your purchased products) and search_products (the general public catalog).

Requirements

• Python >= 3.12
• A DriveThruRPG Application Key (see Getting an API key below)

Installation

pip install dtrpg-mcp

or, to run it without installing anything permanently:

uvx dtrpg-mcp

Configuration

The server needs one environment variable:

Variable	Required	Description
DTRPG_API_KEY	Yes	Your DriveThruRPG Application Key, used to authenticate against the API.

You can set it directly in your shell/MCP client config, or drop a .env file next to your project (the server walks up from its own install location looking for .env, so a .env in your working directory or a parent of it will be picked up automatically via python-dotenv).

Getting a DriveThruRPG API key

1. Log in to drivethrurpg.com.
2. Go to My Account -> Application Keys (or open https://www.drivethrurpg.com/en/account/application-keys directly).
3. Click Generate New Key, give it a name (e.g. "dtrpg-mcp"), and create it.
4. Copy the generated key — this is your DTRPG_API_KEY.

The key only grants access to your library and to the public product catalog search; it does not expose your payment details or let anything make purchases on your behalf.

Using it with an MCP client

Add it to your client's MCP server config. For example, in Claude Desktop's claude_desktop_config.json:

{
  "mcpServers": {
    "dtrpg": {
      "command": "uvx",
      "args": ["dtrpg-mcp"],
      "env": {
        "DTRPG_API_KEY": "your-application-key-here"
      }
    }
  }
}

If installed via pip instead of uvx, use "command": "dtrpg-mcp" with no args.

Tools

Both tools return a list of product detail objects with the same shape:

Field	Description
product_id	The DriveThruRPG product id.
order_product_id	The id of your specific purchased order/product; null for search_products results (not necessarily owned).
title	Product title.
description	A short description/blurb of the product.
publisher	Publisher name.
authors	List of author names (only populated by search_products — DriveThruRPG's library endpoint does not include author data).
game_system	Game system tag, when DriveThruRPG's API surfaces one for the product; otherwise null.

search_library

Search products you've already purchased in your DriveThruRPG library.

Parameters

Name	Type	Default	Description
query	string	—	Text to match against product titles (case-insensitive substring match).
max_values	integer	10	Maximum number of results to return.

Example call — anything in your library with "dungeon" in the title:

{"query": "dungeon"}

Performance note: DriveThruRPG's library endpoint has no server-side title filter and is capped at 50 items per page, with each page taking several seconds to return. A query that matches nothing (or matches only late in a large library) can take tens of seconds to resolve, since pages are fetched in concurrent batches rather than one huge request. This is a limitation of the underlying API, not something a client-side change can fully eliminate.

search_products

Search the general public DriveThruRPG catalog for products — not limited to your library, so this also finds things you don't own.

Parameters

Name	Type	Default	Description
query	string	—	Text to match against product titles (keyword match).
max_values	integer	10	Maximum number of results to return.

Example call — search the catalog for "bardo", capped to 5 results:

{"query": "bardo", "max_values": 5}

Notes on the DriveThruRPG API

DriveThruRPG does not publish official API documentation. This client's endpoint usage was reverse-engineered from the community projects glujan/drpg and quickwick/drivethrurpg-calibre-plugin, and verified empirically against the live API. Notably, the per-product detail endpoint (GET products/{id}) returns 403 for Application Keys like the one this tool uses (it appears to require a different auth scope), so search_library and search_products build product details from the library (order_products) and catalog search (products) list endpoints instead, both of which work with a standard Application Key.

Development

uv sync
uv run pytest

Run the server directly for manual/stdio testing:

uv run dtrpg-mcp