(VB.NET) Automatic JavaScript AI Tool Function Calling

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• Tool function implementations are in JavaScript.
• The JavaScript also provides a tool registry and permissions.
• The JavaScript runs embedded within your application using Chilkat.Js.
• Tool calls are handled entirely within Chilkat. Your application does not need to manually check for function calls in the AI response. Internal to the Ask function, Chilkat will handle function calls by calling your registered JavaScript tools and will send results back to the AI model until the final response is received.

Note: This example requires Chilkat v11.4.0 or greater.

For more information, see https://www.chilkatsoft.com/automatic_ai_javascript_tool_function_calling.asp

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Dim success As Boolean = False

' ----------------------------------------------------------------------------------
' The Javascript file loaded here is shown at the bottom of this page.
' -----------------------------------------------------------------------------------

' In this example, we'll load the Javascript tool functions and registry from a file.
' It doesn't need to come from a file.  It could just as easily be loaded from a string.
Dim sbJs As New Chilkat.StringBuilder
success = sbJs.LoadFile("qa_data/js_tools/horoscope_tools.js","utf-8")
If (success = False) Then
    Debug.WriteLine(sbJs.LastErrorText)
    Exit Sub
End If


Dim ai As New Chilkat.Ai

' Register the tools that will be made available to the AI.
Dim evalOnly As Boolean = False
Dim allowAllKeyword As Boolean = True
ai.RegisterJsTools(sbJs,evalOnly,allowAllKeyword)

' The provider can be "openai", "google", "claude", "grok", "mistral", "custom", etc.
ai.Provider = "openai"
' Use your provider's API key.
ai.ApiKey = "MY_API_KEY"
' Choose a model.
ai.Model = "gpt-5-mini"

' Tool function calling must always occur within a conversation.
Dim conversation_name As String = "convo_astrology"
Dim sysMessage As String = "You are a helpful astrologer"
Dim devMessage As String = "Respond only with a horoscope generated by a tool. Use the tool output as the final answer."
ai.NewConvo(conversation_name,sysMessage,devMessage)

' Provide inputs
ai.InputAddText("What is my horoscope? I am an Aquarius.")

' Send inputs, tool functions, etc. and ask for a "text" response.
' If the AI responds with tool calls, Chilkat automatically handles them by calling your JavaScript
' tool functions as directed by the AI, and sending results back to the AI until the final
' response is received.
success = ai.Ask("text")
If (success = False) Then
    Debug.WriteLine(ai.LastErrorText)
    Exit Sub
End If


' Get the AI response.
Dim sbResponse As New Chilkat.StringBuilder
ai.GetOutputTextSb(sbResponse)
Debug.WriteLine(sbResponse.GetAsString())

// The namespace for the AI tool functions in this JavaScript source file.
// You must provide a namespace.
Example = {};

// ----------------------------
// Tool implementation functions
// -----------------------------
// Tool functions must ALWAYS have just a single argument, which is an object.

// The function name used here must match the "name" in the toolRegistry below.

// By grouping get_compatibility, get_horoscope, toolRegistry, and toolPermissions under the Example object, 
// you are "namespacing" them. This tells anyone reading the code (and the JavaScript engine itself) 
// that these tools belong together and prevents them from clashing with another function that might 
// also be named get_horoscope. 

Example.get_compatibility = function(arg) {
  return  `${arg.sign1} is compatible with ${arg.sign2} in a ${arg.relationship_type} way.`;
}

Example.get_horoscope = function(arg) {
  return  `${arg.sign} : Next Tuesday you will befriend a baby otter.`;
}


// -------------
// Tool Registry
// -------------
// The inputSchema.type must ALWAYS be "object".
// Use this format regardless of the AI provider (ChatGPT, Gemini, Claude, Grok, Mistral, etc.)
Example.toolRegistry = [
  {
    name: "get_horoscope",
    description: "Get today's horoscope for an astrological sign.",
    parameters: {
      properties: {
        sign: { type: "string", description: "An astrological sign like Taurus or Aquarius" }
      },
    }
  },
  {
      name: "get_compatibility",
      description: "Returns compatibility analysis between two zodiac signs, including a score and explanation.",
      parameters: {
        properties: {
          sign1: {
            type: "string", description: "The first zodiac sign (e.g., Aries, Taurus, Gemini)."
          },
          sign2: {
            type: "string", description: "The second zodiac sign (e.g., Aries, Taurus, Gemini)."
          },
          relationship_type: {
            type: "string", description: "Type of compatibility to evaluate. (e.g., romantic, friendship, professional, general)"
          },
          detail_level: {
            type: "string", description: "Level of detail in the response. (e.g., short, medium, detailed)"
          }
        }
      }
  }
];

Example.toolPermissions = [
	  {
	    name: "all",
	    perm: "sandbox",
	  }
	  		
	];
	
// Return the name of this toolset
// This tells Chilkat the namespace of this toolset.
"Example";