rpg-mcp

import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js"; import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js"; import { ToolRegistry } from "./registry.js"; export class RpgMcpServer { private server: McpServer; private registry: ToolRegistry; constructor(registry: ToolRegistry) { this.registry = registry; this.server = new McpServer({ name: "rpg-mcp", version: "1.0.0" }); this.registerTools(); } private registerTools(): void { const tools = this.registry.getRegisteredTools(); for (const tool of tools) { this.server.tool( tool.name, tool.description, // The SDK expects a Zod schema shape or a Zod schema. // Based on docs, it takes (name, description, schema, handler). // We need to ensure the schema is passed correctly. // The SDK's type definition for tool() is generic. // It seems to accept the Zod schema object directly. tool.schema as any, async (args: any) => { try { const result = await tool.handler(args); // MCP expects a specific response format return { content: [ { type: "text", text: typeof result === 'string' ? result : JSON.stringify(result, null, 2) } ] }; } catch (error: any) { // Log to stderr to avoid corrupting stdio transport console.error(`Error executing tool ${tool.name}:`, error); throw error; // SDK handles error responses } } ); } } async start(): Promise<void> { const transport = new StdioServerTransport(); await this.server.connect(transport); console.error("RPG MCP Server started on stdio"); } }