open rpg system designer

    1

    Architect original RPG systems and mechanics with built-in SRD provenance tracking and licensing compliance.

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    open rpg system designer

    Example session with this skill installed

    Design a tactical sci-fi RPG system focused on ship-to-ship boarding actions using SRD 5.2.1 as a mechanical reference for combat scaling.

    • Read your context and instructions
    • Compiled the open rpg system
    • Generated the UI component

    I have drafted the core engine and design pillars for 'Hull Breach,' a tactical sci-fi RPG. This system adapts the SRD 5.2.1 proficiency and scaling patterns while introducing an original 'Oxygen-as-Action' economy.

    Hull Breach: Core System Design

    ComponentDesign SpecificationSRD Influence
    Design PillarsHigh lethality, resource scarcity, 3D tactical movement.N/A (Original)
    Core LoopBreach > Secure Compartment > Loot/Repair > Extract.N/A (Original)
    Resolution2d10 + Modifier vs Difficulty Class (DC).Adapted (DC Scaling)
    Action Economy3 AP per turn; Oxygen depletion reduces max AP.Modified (Bonus Actions)
    ScalingProficiency Bonus applied to specialized tech/weapons.Reused (SRD 5.2.1)
    ConsequencesVacuum exposure, system failure, permanent injury.Inspired (Conditions)

    Mechanical Highlight: The Breach Procedure

    Instead of traditional initiative, the 'Breaching' party acts in a coordinated burst. Defenders utilize 'Reaction Fire' pools. Combat is resolved using a d10-based system to tighten the variance compared to a d20, ensuring that tactical positioning (cover and elevation) outweighs luck.

    Provenance & Attribution

    This work includes material taken from the System Reference Document 5.2.1 (“SRD 5.2.1”) by Wizards of the Coast LLC and available at https://dnd.wizards.com/resources/systems-reference-document. The SRD 5.2.1 is licensed under the Creative Commons Attribution 4.0 International License available at https://creativecommons.org/licenses/by/4.0/legalcode.

    Next steps

    1. Review the 'Oxygen-as-Action' subsystem for potential death spirals.
    2. Run the game-design-fairness-frustration-audit on the Reaction Fire mechanics.
    3. Define the 'Class' equivalents for specialized boarding roles (Technician, Breacher, Medic).

    open-rpg-system-designer.tsx

    TSX · React component

    Generated

    Example file from a real run - the skill writes it into your workspace.

    Connects securely to your tools. The creator never sees your data.

    What you get

    Draft a complete RPG core engine with original resolution mechanics.Generate legally compliant attribution blocks for SRD-based projects.Create a provenance ledger to track mechanical inspiration and adaptations.Build specialized subsystems for social, magic, or crafting mechanics.

    About this skill

    The problem

    Designing a balanced RPG system from scratch is a massive undertaking that often leads to mechanical bloat or accidental copyright infringement. Developers struggle to maintain consistency between core loops and subsystems while navigating complex SRD licensing requirements.

    What it does

    • Drafts original RPG engines including resolution mechanics, character advancement, and consequence systems.
    • Maps design decisions to SRD 5.1 or 5.2.1 patterns for mechanical inspiration without verbatim copying.
    • Generates structured provenance ledgers to track whether mechanics are original, adapted, or inspired.
    • Builds modular subsystems for combat, social interaction, magic, and downtime tailored to specific design pillars.
    • Automates correct attribution blocks for Creative Commons (CC BY 4.0) or OGL 1.0a compliance.

    Why this beats prompting it yourself

    General prompts often produce generic D&D clones or hallucinate legal permissions. This skill enforces a rigorous design methodology that separates mechanical patterns from protected IP, ensures your core loop supports your design pillars, and maintains a professional audit trail for commercial release.

    Use cases

    • Building a standalone d20-based tabletop RPG for commercial publication.
    • Designing a lightweight narrative system for an indie digital RPG.
    • Creating a specialized magic or crafting subsystem for an existing game.
    • Refactoring legacy homebrew rules into a clean, legally compliant document.

    Known limitations

    Does not provide legal advice or live rules adjudication during gameplay. Requires external research skills for deep competitive source comparison.

    How to install

    Works the same in every agent - Claude, Cursor, Codex, Copilot and 20+ more.

    ~30 seconds
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    Dndbeyond

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