A plugin that adds a complete tabletop role-playing game system, including world building, game-master play, combat, and tools for expanding or documenting a campaign.

It is for generating settings, running adventures, managing combat, expanding worlds, and producing campaign books through its RPG tools.

It brings the separate pieces needed to create and run an RPG world into one add-on.

rpg — Plugin by protoLabsAI

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Claude Code

/plugin marketplace add protoLabsAI/mythx-mcp

agentmods

npx agentmods add plugins/protolabsai/mythx-mcp/world-builder

Clone the repo

git clone --depth 1 https://github.com/protoLabsAI/mythx-mcp

Made for: Claude Code.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured The manifest loads nothing itself; its 7 skills, 5 agents, 4 hooks cost 319 tokens a session between them.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

rpg scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

world-builder/.claude-plugin/plugin.json · 18 lines

What it actually says

{
  "name": "rpg",
  "description": "RPG World Builder - Full tabletop RPG experience with parallel world generation, GM-driven gameplay, combat, book generation, and world expansion tools powered by the RPG MCP server.",
  "version": "1.4.0",
  "author": {
    "name": "MythX Engine"
  },
  "repository": "https://github.com/protoLabsAI/mythx-mcp",
  "keywords": ["rpg", "tabletop", "game-master", "world-building", "mcp"],
  "mcpServers": {
    "rpg": {
      "command": "npx",
      "args": ["-y", "@mythxengine/mcp-server@^0.3.0"]
    }
  },
  "hooks": "./hooks/hooks.json"
}

Contents

What it installs

The manifest is a name and a version. 7 skills, 5 agents, 4 hooks travel with it, and installing the plugin installs all of them — 319 tokens a session between them. Each is measured on its own page, and each can be installed alone.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2d ago First seen · 18 lines scan A 1c298a7ad223

Subscribe to this mod's changes

rpg is a plugin published in the GitHub repository protoLabsAI/mythx-mcp (2 stars, last pushed 14d ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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