Mcp Dice

Overview

MCP Dice is a lightweight Model Context Protocol server that gives large language models the ability to perform dice rolls in a standardized, reproducible way. By exposing a simple JSON API that accepts classic tabletop notation—such as , , or —the server returns both the individual die outcomes and the calculated total. This functionality is especially valuable for developers building role‑playing game (RPG) assistants, simulation tools, or any application that requires random number generation tied to user‑defined expressions.

Why Dice Rolling Matters for AI Workflows

Randomness is a core mechanic in many game systems and probabilistic simulations. Traditionally, an AI assistant would have to embed a random number generator or rely on external services, which can lead to inconsistent results and harder debugging. MCP Dice solves this by centralizing the logic in a single, well‑tested service that can be called from any MCP‑compatible client. The server’s deterministic handling of modifiers, multiple dice, and timestamps ensures that the same input will always produce the same output unless explicitly re‑rolled, making it ideal for turn‑based game logic or iterative design processes.

Key Features

• Standard Dice Notation Support – Handles single and multiple dice, plus optional modifiers (e.g., ).
• Granular Output – Returns an array of individual rolls, the sum before and after modifiers, and a timestamp for traceability.
• Seamless Integration – Works out of the box with Claude Desktop, Smithery installations, and any client that can consume MCP servers.
• Debugging Friendly – Compatible with the MCP Inspector, allowing developers to visualize requests and responses in real time.

Real‑World Use Cases

• RPG Game Masters – Automate combat calculations, skill checks, and loot rolls directly within a chat interface.
• Game Development – Test character stats or AI decision trees that depend on random outcomes without hardcoding values.
• Educational Tools – Demonstrate probability concepts to students through interactive simulations powered by an LLM.
• Creative Writing – Generate unpredictable plot twists or character actions in collaborative storytelling sessions.

Integration into AI Workflows

A typical workflow involves the assistant sending a JSON payload with the desired notation to the MCP Dice server. The response is then parsed and incorporated into the assistant’s narrative or logic layer. Because MCP Dice follows the same protocol conventions as other servers, developers can chain it with calculation or database servers to build complex decision trees—all while keeping the codebase modular and maintainable.

Standout Advantages

MCP Dice stands out for its simplicity and reliability. It removes the need to implement custom random number logic in every client, reduces duplication of effort across projects, and provides a single source of truth for dice mechanics. Its compatibility with popular tools like Claude Desktop and MCP Inspector makes it a plug‑and‑play component in any modern AI‑driven application that requires randomness.