B4X Requires Chilkat v11.4.0+
B4X
Streaming AI with Manual AI Tool Function Calling
See more AI Examples
Demonstrates how to get AI responses in streaming mode, including manual tool function calls.Chilkat B4X Downloads
Dim success As Boolean = False
' Create the following JSON to define tool functions available for the AI to use.
' Note: You'll use the following JSON format regardless of the AI provider, whether
' it be ChatGPT, Gemini, Claude, Grok, etc. Chilkat automatically converts to the required
' format needed for a given AI provider.
' In this example, the application is providing a single function the AI may choose to call.
' {
' "tools": [
' {
' "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"
' }
' }
' }
' }
' ]
' }
Dim jsonTools As ChilkatJsonObject
jsonTools.Initialize
Dim toolIdx As Int = 0
jsonTools.I = toolIdx
jsonTools.UpdateString("tools[i].name", "get_horoscope")
jsonTools.UpdateString("tools[i].description", "Get today's horoscope for an astrological sign.")
jsonTools.UpdateString("tools[i].parameters.properties.sign.type", "string")
jsonTools.UpdateString("tools[i].parameters.properties.sign.description", "An astrological sign like Taurus or Aquarius")
' More tools can be added as desired..
jsonTools.EmitCompact = False
Log(jsonTools.Emit)
Dim ai As ChilkatAi
ai.Initialize("ai")
' Register the tools that will be made available to the AI.
ai.RegisterManualTools(jsonTools)
' 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-5.6-luna"
' 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 markdown."
ai.NewConvo(conversation_name, sysMessage, devMessage)
' Provide inputs
ai.InputAddText("What is my horoscope? I am an Aquarius.")
' Get the response in streaming mode.
ai.Streaming = True
' In streaming mode, if we receive an AI event that is a request for tool use,
' we'll need to make the call to the JavaScript and then continue with a followup Ask,
' until the final response is received.
Dim sbEventName As ChilkatStringBuilder
sbEventName.Initialize
Dim sbDelta As ChilkatStringBuilder
sbDelta.Initialize
Dim sbFullResponse As ChilkatStringBuilder
sbFullResponse.Initialize
' When PollAi returns with an event, it's highly unlikely the
' call to NextAiEvent does not immediately return. Setting a max
' timeout is just a precaution..
Dim maxWaitMs As Int = 5000
Dim jsonFn As ChilkatJsonObject
jsonFn.Initialize
Dim finished As Boolean = False
Dim numAsks As Int = 0
' Set a max # of followup Asks to prevent any unexpected infinite looping.
Do While Not(finished) And (numAsks < 10)
' Send the request to the AI model.
success = ai.Ask("text")
If success = False Then
Log(ai.LastErrorText)
Return
End If
Dim madeFunctionCalls As Boolean = False
Dim streamingDone As Boolean = False
Do While Not(streamingDone)
Dim result As Int = ai.PollAi(False)
If result < 0 Then
Log(ai.LastErrorText)
Log("Failed.")
Return
End If
If result > 0 Then
' We have an event..
success = ai.NextAiEvent(maxWaitMs, sbEventName, sbDelta)
If success = False Then
Log(ai.LastErrorText)
Return
End If
' Is this an event where the AI is requesting a function call?
If sbEventName.ContentsEqual("function_call", True) Then
jsonFn.LoadSb(sbDelta)
' Note: Chilkat will convert responses from all AI providers to this format:
' {
' "function_call": [
' {
' "name": "get_horoscope",
' "call_id": "call_RYmeysYQFocFc7Z2ofkv61dW",
' "arguments": "{\"sign\":\"Aquarius\"}",
' "args": {
' "sign": "Aquarius"
' }
' }
' ]
' }
Dim numFnCalls As Int = jsonFn.SizeOfArray("function_call")
Dim fn_idx As Int = 0
Do While (fn_idx < numFnCalls)
jsonFn.I = fn_idx
Dim sbFnName As ChilkatStringBuilder
sbFnName.Initialize
jsonFn.StringOfSb("function_call[i].name", sbFnName)
Dim callId As String = jsonFn.StringOf("function_call[i].call_id")
If sbFnName.ContentsEqual("get_horoscope", True) = True Then
' The get_horoscope function (as defined above) has one argument named "sign".
Dim zodiac_sign As String = jsonFn.StringOf("function_call[i].args.sign")
Log("zodiac_sign = " & zodiac_sign)
' Insert application code here to call your app's get_horoscope function, passing the zodiac_sign to it..
' For this example, we'll pretend the app's get_horoscope function returned the following:
Dim applicationFnCallResult As String = "Aquarius: Next Tuesday you will befriend a baby otter."
' Provide the tool call result as an input for the followup Ask.
ai.InputAddFnResult(callId, applicationFnCallResult)
madeFunctionCalls = True
End If
' Your application would add code to check for and handle each possible function call.
fn_idx = fn_idx + 1
Loop
Else
If Not(sbEventName.ContentsEqual("empty", True)) Then
sbFullResponse.AppendSb(sbDelta)
If sbEventName.ContentsEqual("null_terminator", True) Then
streamingDone = True
End If
End If
End If
Else
' No event arrived, so wait a short time rather than spin in a loop..
ai.SleepMs(100)
End If
Loop
If Not(madeFunctionCalls) Then
finished = True
End If
numAsks = numAsks + 1
Loop
Log("Full Response:")
Log(sbFullResponse.GetAsString)