MCP Server Polyhedral exposes an MCP (Model Context Protocol) server so AI coding assistants can read and write your game data — notes, encounters, library resources, dice rolls, and more. MCP access requires Builder Access ($5/month) . Any Polyhedral AI-powered actions also consume prepaid AI credits.
Prerequisites Start an active Builder Access subscription. Open Developer Tools from your avatar menu and create an API key. Copy the key — you will not be able to see it again. Claude Code Add this to your .mcp.json:
{
"mcpServers": {
"polyhedral": {
"type": "url",
"url": "https://polyhedral.co/api/mcp",
"headers": {
"Authorization": "Bearer <YOUR_API_KEY>"
}
}
}
} Cursor / Windsurf Same configuration format — add to your project or global MCP settings:
{
"mcpServers": {
"polyhedral": {
"type": "url",
"url": "https://polyhedral.co/api/mcp",
"headers": {
"Authorization": "Bearer <YOUR_API_KEY>"
}
}
}
} Available Tools Games — list, get, create, update, delete, invite, list membersNotes — get, create, update, delete, searchLibrary — list resources, get resource, get page text, render page image, get TOC, search, update visibility, add/remove from gameChat — get history, send messageDice — roll dice with standard RPG notationRollable Tables — get, create, update, delete, roll on tableEncounters — get, create, update, deleteSheets — list fields, get/create/update/delete instancesMaps — list, get, create, update, delete, get imageTokens — list tokens, manage (create/update/delete) tokens on mapsStage — get stage state, manage player-facing presentationTurn Tracker — get tracker, manage combat flow, manage turn orderContent Organization — list all content, manage groups, tags, and content linksResources The server also exposes MCP resources for browsing game data:
polyhedral://games polyhedral://games/{gameId}/notes polyhedral://games/{gameId}/notes/{noteId} polyhedral://games/{gameId}/library polyhedral://games/{gameId}/library/{resourceId} polyhedral://games/{gameId}/chat/recent