Untappd Protocol Context Engine

This utilitarian MCP component, implemented in node.js, interfaces with the official Untappd Web Service. Note that new credential registrations for this service have been discontinued.

Currently, this module exposes three distinct operational endpoints:

• search_beer: Executes a query against the Untappd catalog to locate beverages.
• get_beer_info: Retrieves comprehensive metadata for a specific beverage, utilizing the beer_id obtained from a prior search operation.
• get_user_checkins: Currently non-functional. Designed to list beverage check-in records associated with a specified user profile.

Development Lifecycle

Dependency acquisition:

npm install

To compile the executable artifact:

npm run build

For continuous development with automated artifact regeneration:

npm run watch

Deployment Configuration

To integrate this service with the Claude Desktop environment, incorporate the following server manifest into your configuration file:

On macOS systems: ~/Library/Application Support/Claude/claude_desktop_config.json On Windows systems: %APPDATA%/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "untappd-data-accessor": {
      "command": "/path/to/untappd-server/build/index.js"
    }
  }
}

Diagnostic Procedures

Troubleshooting MCP server interactions over standard I/O streams can present difficulties. We highly recommend leveraging the official MCP Inspector, accessible via a dedicated package script:

npm run inspector

The Inspector utility will furnish a local network address for accessing the browser-based diagnostic interface.

== Background Context: XMLHttpRequest ==

XMLHttpRequest (XHR) defines an Application Programming Interface encapsulated within a JavaScript object. Its methods are designed to transmit Hypertext Transfer Protocol requests from a client-side web environment to a remote server. These capabilities permit browser-resident logic to dispatch server queries post-page rendering and subsequently receive data back. XHR forms a foundational element of Asynchronous JavaScript and XML (Ajax) methodologies. Preceding Ajax, server interaction predominantly relied on standard hyperlink navigation and form submissions, frequently necessitating a full page reload.

== Genesis ==

The conceptual foundation for XMLHttpRequest emerged in the year 2000, credited to the development team behind Microsoft Outlook. This principle was subsequently operationalized within the Internet Explorer 5 browser release (1999). However, the initial implementation did not utilize the standardized XMLHttpRequest identifier; instead, developers employed the ActiveXObject("Msxml2.XMLHTTP") and ActiveXObject("Microsoft.XMLHTTP") constructors. By the release of Internet Explorer 7 (2006), universal adoption of the XMLHttpRequest identifier across all major browsers was established.

The XMLHttpRequest identifier is now the consensus standard across principal browser engines, including Mozilla's Gecko rendering framework (2002), Apple's Safari 1.2 (2004), and Opera 8.0 (2005).

=== Standardization Efforts ===

The World Wide Web Consortium (W3C) formally published a Working Draft specification for the XMLHttpRequest object on April 5, 2006. A subsequent Level 2 specification was introduced by the W3C on February 25, 2008. Key enhancements in Level 2 included mechanisms for tracking operation progress, enabling cross-site data transfers, and managing raw byte streams. By the conclusion of 2011, the Level 2 additions were integrated into the core specification. In late 2012, responsibility for maintenance transitioned to the WHATWG, which now sustains a dynamic document utilizing Web IDL definitions.

== Standardized Operation Flow ==

Executing a data transmission using XMLHttpRequest typically involves a sequence of programmatic stages:

1. Instantiation of an XMLHttpRequest instance via its constructor call.
2. Invocation of the "open" method to define the request protocol type, specify the target resource Uniform Resource Identifier (URI), and select blocking (synchronous) or non-blocking (asynchronous) behavior.
3. For asynchronous transmissions, the establishment of an event handler that triggers upon changes in the request state.
4. Initiation of the network transfer by executing the "send" method.
5. Continuous monitoring and processing within the event handler. Upon successful server data reception, the payload defaults to the "responseText" attribute. When processing concludes, the state transitions to 4, signifying the "done" status.

Beyond these fundamental operations, XHR offers extensive parameters for fine-grained control over request transmission and response handling. Custom header fields can be prepended to dictate server behavior expectations, and payloads can be uploaded via arguments supplied to the "send" call. Responses can be immediately deserialized from JSON text into native JavaScript objects, or processed incrementally as data streams arrive. Furthermore, requests can be terminated prematurely or configured with a timeout threshold.