OSR plugins

A plugin marketplace for AI-powered Old-School Renaissance tabletop RPG tools for Copilot CLI, Claude Code, and other harnesses that can use agent skills.

Install

# Add the marketplace and install a plugin
/plugin marketplace add mmacy/osr-plugins
/plugin install bx-referee@osr-plugins
/reload-plugins

Local development

git clone https://github.com/mmacy/osr-plugins.git
cd osr-plugins
claude --plugin-dir ./plugins/bx-referee

Plugins

B/X Referee

Your coding agent acts as the referee by running adventures from adventure module files (PDF or Markdown), resolving encounters, adjudicating combat, and tracking party state while you make the characters' decisions. /plugin install bx-referee@osr-plugins Type Let's play OSE. or /bx-referee:referee to start playing.

Ironsworn Referee

A solo/co-op play tool for Ironsworn by Shawn Tomkin. The agent identifies which move triggers from your fiction, calls a deterministic Python CLI for every dice roll and oracle, and narrates outcomes from the move's own text. No prepared module needed — Ironsworn's content emerges from your character's vows and oracle rolls.

/plugin install ironsworn-referee@osr-plugins

Type Let's play Ironsworn. or /ironsworn-referee:referee to start playing.

Extensions

OSR Game Client

A Copilot CLI extension that spawns a native webview for OSR referee plugins in this repository. It brings the table state, party roster, locations, dice, rules lookup, and referee chat into one desktop window. /osr-game-client