Vilnius Transit Data Gateway (MCP Implementation)

This artifact serves as a Model Context Protocol (MCP) server instance, engineered to furnish Large Language Models (LLMs) with programmatic access to contemporary public transportation statistics pertaining to the city of Vilnius. It exemplifies leveraging the MCP framework to augment LLM intelligence with live transit data streams.

The Model Context Protocol (MCP) [https://modelcontextprotocol.io/introduction] establishes a standardized, secure mechanism allowing LLMs to interface with external data sources and computational routines. Key capabilities provided by MCP include: - Secure ingestion of dynamic or localized datasets - Invocation of external executables (e.g., via a configuration path like [claude_desktop_config.json](../../../Library/Application%20Support/Claude/claude_desktop_config.json)) - Controlled interaction with underlying operating environments - Enforcement of uniform interface contracts for tooling

This specific implementation furnishes MCP tools tailored for Vilnius transport queries, enabling LLMs to accurately address user inquiries regarding route schedules and station locations.

The gateway exposes the following atomic operations for LLM consumption:

• query_station_by_name: Initiates a lookup for transit hubs matching a specified nomenclature fragment or full identifier

{ stop_identifier: string; // The complete or partial designation of the transit facility sought } - determine_nearest_station: Calculates the transit stop geographically closest to specified geographic coordinates

{ geo_coords: string; // Required format: "latitude, longitude" (e.g., "54.687157, 25.279652") }

To incorporate this MCP service into your Claude application environment, integrate the subsequent configuration stanza into your claude_desktop_config.json file:

 {
  "mcpServers": {
    "vilnius_transit_service": {
      "command": "uv",
      "args": [
          "--directory",
          "path/vilnius-transport-mcp-server/src/vilnius_transport_mcp",
          "run",
          "transport.py"
      ]
    }
  }
 }

Crucial Note: Ensure that the directory reference above accurately maps to your local deployment structure.

To initiate the consumer side utility: commandline uv run client.py path/src/vilnius_transport_mcp/transport.py

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== History == The concept behind XMLHttpRequest was conceived in 2000 by the developers of Microsoft Outlook. The concept was then implemented within the Internet Explorer 5 browser (1999). However, the original syntax did not use the XMLHttpRequest identifier. Instead, the developers used the identifiers ActiveXObject("Msxml2.XMLHTTP") and ActiveXObject("Microsoft.XMLHTTP"). As of Internet Explorer 7 (2006), all browsers support the XMLHttpRequest identifier. The XMLHttpRequest identifier is now the de facto standard in all the major browsers, including Mozilla's Gecko layout engine (2002), Safari 1.2 (2004) and Opera 8.0 (2005).

=== Standards === The World Wide Web Consortium (W3C) published a Working Draft specification for the XMLHttpRequest object on April 5, 2006. On February 25, 2008, the W3C published the Working Draft Level 2 specification. Level 2 added methods to monitor event progress, allow cross-site requests, and handle byte streams. At the end of 2011, the Level 2 specification was absorbed into the original specification. At the end of 2012, the WHATWG took over development and maintains a living document using Web IDL.

== Usage == Generally, sending a request with XMLHttpRequest has several programming steps.

Create an XMLHttpRequest object by calling a constructor: Call the "open" method to specify the request type, identify the relevant resource, and select synchronous or asynchronous operation: For an asynchronous request, set a listener that will be notified when the request's state changes: Initiate the request by calling the "send" method: Respond to state changes in the event listener. If the server sends response data, by default it is captured in the "responseText" property. When the object stops processing the response, it changes to state 4, the "done" state. Aside from these general steps, XMLHttpRequest has many options to control how the request is sent and how the response is processed. Custom header fields can be added to the request to indicate how the server should fulfill it, and data can be uploaded to the server by providing it in the "send" call. The response can be parsed from the JSON format into a readily usable JavaScript object, or processed gradually as it arrives rather than waiting for the entire text. The request can be aborted prematurely or set to fail if not completed in a specified amount of time.

== Cross-domain requests ==

In the early development of the World Wide Web, it was found possible to brea