xby-dice

In conversational workflows, an LLM is often asked to roll a die to determine an outcome, yet it cannot natively produce true random numbers. xby-dice is a lightweight MCP plugin that wraps standard dice-notation parsing and random rolling into a single tool call, so the model can simply say roll 2d6+3 and receive each individual result along with the total.

It handles common face counts like d20 and d6, supports modifiers such as 1d20-2, and can throw multiple dice in one call. The API key only needs to be set once and is persisted automatically across restarts, removing repeated setup friction.

Ideal for tabletop RPG players who want to replace physical dice mid-session, game-prototype developers testing random events, and any builder who wants a touch of fate in a chat flow.