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MCP Resources: Data AI Can Read

Resources represent data that AI can read — files, database records, configuration, API responses. Unlike tools (which perform actions), resources are read-only data sources.

typescript

// Static resource - fixed URI
server.resource(
  "config",
  "config://app",
  async () => ({
    contents: [{
      uri: "config://app",
      mimeType: "application/json",
      text: JSON.stringify({ theme: "dark", version: "2.0" }),
    }],
  })
);

// Dynamic resource with template
server.resource(
  "user-profile",
  new ResourceTemplate("users://{userId}", { list: undefined }),
  async (uri, { userId }) => ({
    contents: [{
      uri: uri.href,
      mimeType: "application/json",
      text: JSON.stringify(await db.users.findById(userId)),
    }],
  })
);

Tip:Use resources for data the AI needs to READ. Use tools for actions the AI needs to PERFORM. This separation keeps your server clean and secure.