A D&D 5e game engine plugin for Claude Code. Claude becomes your Dungeon Master - all game state lives in markdown files, with transparent dice rolling and full 5e rules.

Claude Code is Anthropic's CLI tool for working with Claude in your terminal. It supports plugins - packages that give Claude new skills and commands.

This plugin turns Claude into a D&D 5th Edition Dungeon Master. You play a solo campaign in your terminal, and the entire campaign state is stored as plain markdown files you can read, edit, and version-control with git.

• Persistent world state in markdown - Characters, NPCs, locations, quests, inventory, and session history all live in game/ as .md files. Game state is only what's written in the files.
• Full 5e rules engine - Combat, spells, ability checks, death saves, and more following Rules as Written from the Player's Handbook.
• Transparent dice rolls - A dedicated roll script handles all dice with batch support: attacks, damage, initiative, advantage/disadvantage, and ability score generation in a single call.
• Secrets-first quest design - Every quest has a pre-defined truth, evidence trail, and NPC knowledge seeds baked in at creation. Clues are seeded across locations and NPCs, producing coherent mysteries instead of improvised narratives.
• NPC sub-agent system - Each named NPC is played by a dedicated sub-agent that stays in character, only knows what the NPC would know, and maintains its own conversation history.
• Tension clocks - Off-screen threats and faction agendas advance based on triggers, even when you're not interacting with them.
• Faction reputation system - Your actions shift how organizations treat you, from Nemesis (-5) to Champion (+5), with mechanical effects at each tier.
• Random event tables - Town, road, wilderness, and dungeon encounter tables that tie into active quest threads.
• Solo-play balanced - Encounter difficulty, healing access, and safety nets tuned for a single player character.
• Session save/restore - Save mid-session and pick up where you left off, even across conversations.
• Git-friendly - Plain text means you can commit your campaign, branch timelines, or share saves.

In Claude Code, run /plugin, select Marketplace, and paste:

https://github.com/SergeyKhval/claude-dnd

Or load locally with claude --plugin-dir /path/to/claude-dnd.

/claude-dnd:new-campaign

That's it. You'll build the world and your character together, then start playing.

Between commands, just talk - the DM runs automatically during gameplay.