What dice formats does this skill support?

It supports standard notation like 1d20, 2d6, d100, and 4dF (Fudge/Fate dice), including both addition and subtraction modifiers.

Does it handle complex modifiers?

Yes, the script automatically processes expressions like 3d8-2 or 1d20+5, calculating the individual rolls and the final total for you.

Can I use this for hidden GM rolls?

Yes, Claude can execute the skill silently to determine secret outcomes and only narrate the result to the player without exposing the raw numerical data.

Is the dice rolling truly random?

The skill uses a local bash script to generate results, providing a reliable source of randomness suitable for programmatic game mechanics.

How does Claude use the dice results?

Claude parses the JSON output from the bash script to determine the success or failure of actions and then narrates the outcome to the player in character.

Dice Roller for Claude

Name: Dice Roller for Claude
Author: rjroy

byrjroy

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Game Development

Provides deterministic dice rolling capabilities with structured JSON output for AI-driven tabletop RPG adventures and game mechanics.

The Dice Roller skill enables Claude to manage the randomness inherent in tabletop RPGs by executing precise dice calculations through a bash-based script. It supports standard notation (e.g., d20, 2d6+modifier) and specialized formats like Fudge dice, returning structured JSON results that include individual rolls and totals. This skill is essential for GMs using Claude to automate skill checks, combat encounters, and saving throws while maintaining a consistent and narratively integrated game world.

Key Features

01Compatibility with Fudge/Fate dice systems (4dF)

021 GitHub stars

03Deterministic bash-based execution for reliable random number generation

04Structured JSON output containing individual die results, modifiers, and totals

05Support for standard RPG dice notation including d20, d100, and multi-die pools

06Seamless integration for skill checks, initiative, and damage rolls in TTRPG systems

Use Cases

01Resolving skill checks and saving throws based on system-specific difficulty thresholds

02Generating random outcomes for procedural story elements and world-building events

03Automating combat mechanics and damage calculation in AI-moderated RPG sessions

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add rjroy/adventure-engine-corvran dice-roller

For use in Claude.ai and ChatGPT

Download Skill