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patissierMongs

Dice MCP Server

Dice MCP Server

A Model Context Protocol (MCP) server for TRPG dice rolling across multiple game systems.

Quick Start

{
  "mcpServers": {
    "dice": {
      "command": "uvx",
      "args": ["roleplaying-dice-mcp"]
    }
  }
}

Config: macOS ~/Library/Application Support/Claude/claude_desktop_config.json / Windows %APPDATA%\Claude\claude_desktop_config.json

pip / Docker

pip install roleplaying-dice-mcp
roleplaying-dice-mcp
docker build -t dice-mcp-server . && docker run -i dice-mcp-server

Tools

Tool

Purpose

Key Params

roll_dice

Roll dice using standard notation (NdM+X, kh/kl, dF)

notation, advantage, bonus_dice, target, degrees

roll_pool

Dice pool with success counting (WoD, Shadowrun)

pool, target, explode, count_ones

reroll

Re-roll last roll with same params

get_history

Retrieve recent roll log

limit

clear_history

Clear roll history

See CONTEXT.md for system-specific parameter mappings and invariants.


Parameter Reference

roll_dice

Parameter

Type

Default

Description

notation

string

required

Dice expression: 1d20+5, 4d6kh3, 4dF+2, 1d100

advantage

bool

false

Roll d20 twice, take higher (1d20 only)

disadvantage

bool

false

Roll d20 twice, take lower (1d20 only)

bonus_dice

int

0

CoC bonus dice (0–2, 1d100 only) — extra tens, keep lowest

penalty_dice

int

0

CoC penalty dice (0–2, 1d100 only) — extra tens, keep highest

target

int

DC/AC/skill value for success check

target_mode

enum

"at_least"

"at_least" (D&D: ≥) or "at_most" (CoC: ≤)

critical

bool

false

Nat 20/1 detection. With degrees="pf2e", shifts degree ±1 step

degrees

enum

"coc" / "pf2e" / "pbta" — enables degree calculation

roll_pool

Parameter

Type

Default

Description

pool

int

required

Number of dice (1–50)

sides

int

10

Sides per die

target

int

8

Minimum value for a success (≥)

explode

bool

false

Reroll on max value

double_on

int

Double success at this value or higher (must be ≥ target)

count_ones

bool

false

Enable botch/glitch detection

get_history

Parameter

Type

Default

Description

limit

int

10

Number of recent rolls to retrieve (1–100)

System Coverage

System

Coverage

Key Features Used

D&D 5e

95%

notation, advantage, critical, target, 4d6kh3

CoC 7e

85%

d100, bonus/penalty dice, degrees=coc, at_most

PF2e

85%

d20+mod, degrees=pf2e, critical (nat 20/1 shift)

PbtA

90%

2d6+mod, degrees=pbta

FATE

95%

4dF+mod

WoD

90%

roll_pool, explode, count_ones (botch)

Shadowrun

85%

roll_pool (d6), count_ones (glitch)

Savage Worlds

50%

Exploding works, but no wild die or raise counting

Project Structure

├── server.py              # MCP server — tools & handlers
├── dice_parser.py         # Notation parser (NdM, NdF, kh/kl)
├── history.py             # Roll history manager
├── src/roleplaying_dice_mcp/  # PyPI package
├── tests/test_trpg_scenario.py
├── pyproject.toml
├── Dockerfile
└── README.md

License

MIT

Install Server
A
security – no known vulnerabilities
F
license - not found
A
quality - A tier

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