Pascal (Lazarus/Delphi)

Automatic JS AI Tool Calling with Supporting JS Sources

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Demonstrates an automatic JavaScript tool function calling where JavaScript code can be loaded from additional scripts that don't include a tool registry. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Ai,
  Chilkat.StringBuilder;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  sbJs: TStringBuilder;
  ai: TAi;
  sbExtraJs: TStringBuilder;
  evalOnly: Boolean;
  allowAllKeyword: Boolean;
  conversation_name: string;
  sysMessage: string;
  devMessage: string;
  sbResponse: TStringBuilder;

begin
  success := 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.
  sbJs := TStringBuilder.Create;
  success := sbJs.LoadFile('qa_data/js_tools/toolset_5.js','utf-8');
  if (success = False) then
    begin
      WriteLn(sbJs.LastErrorText);
      Exit;
    end;

  ai := TAi.Create;

  //  Additional JavaScript code can be loaded into the AI object's internal JS engine
  //  by calling RegisterJsTools with evalOnly = True.
  sbExtraJs := TStringBuilder.Create;
  sbExtraJs.Append('function getOrderTotal({ order_id }) { return 149.95; }');

  //  When evalOnly equals True, it tells Chilkat that no toolRegistry will be present.
  //  The purpose for doing the eval is to add function definitions to the global namespace.
  //  The value passed for allowAllKeyword is meaningless (not used) when evalOnly = True.
  evalOnly := True;
  allowAllKeyword := True;
  ai.RegisterJsTools(sbExtraJs,evalOnly,allowAllKeyword);

  //  Register the tools that will be made available to the AI.
  evalOnly := False;
  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.
  conversation_name := 'convo_4';
  sysMessage := 'You are a helpful business assistant';
  devMessage := 'Respond only with a information generated by a tool.';
  ai.NewConvo(conversation_name,sysMessage,devMessage);

  //  Provide inputs
  ai.InputAddText('What is the total for order A123?');

  //  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
    begin
      WriteLn(ai.LastErrorText);
      Exit;
    end;

  //  Get the AI response.
  sbResponse := TStringBuilder.Create;
  ai.GetOutputTextSb(sbResponse);
  WriteLn(sbResponse.GetAsString());


  sbJs.Free;
  ai.Free;
  sbExtraJs.Free;
  sbResponse.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.