Dynamic Parameterized URIs (RFC 6570)

When an MCP server exposes massive or unbounded datasets (such as hundreds of thousands of customer support tickets, database rows, or Git commits), statically enumerating every item in resources/list is infeasible. The Model Context Protocol solves this through Resource Templates.

import { McpServer, ResourceTemplate } from "@modelcontextprotocol/sdk/server/mcp.js";

const server = new McpServer({ name: "jira-mcp", version: "1.0.0" });

server.resource(
  "jira-ticket",
  new ResourceTemplate("jira://projects/{projectKey}/issues/{issueId}", { list: undefined }),
  async (uri, { projectKey, issueId }) => {
    const issueData = await fetchJiraTicket(projectKey, issueId);
    return {
      contents: [{
        uri: uri.href,
        mimeType: "application/json",
        text: JSON.stringify(issueData, null, 2)
      }]
    };
  }
);