(Android™) Automatic JS AI Tool Function Calling using Chilkat within the JavaScript

See more AI Examples

• 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/ai_javascript_tool_function_calling.asp

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// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean success = false;

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

    CkStringBuilder sbJs = new CkStringBuilder();
    success = sbJs.LoadFile("qa_data/js_tools/stock_quote_tools.js","utf-8");
    if (success == false) {
        Log.i(TAG, sbJs.lastErrorText());
        return;
        }

    CkAi ai = new CkAi();

    // Register the tools that will be made available to the AI.
    boolean evalOnly = false;

    boolean allowAllKeyword = false;

    // If we were to set allowAllKeyword = true, then we could
    // give all Chilkat classes permission, like this:
    // 
    // Example.toolPermissions = [
    // 	  {
    // 	    name: "all",
    // 	    perm: "sandbox",
    // 	  }
    // 	];

    ai.RegisterJsTools(sbJs,evalOnly,allowAllKeyword);

    // The provider can be "openai", "google", "claude", "grok", "mistral", "custom", etc.
    ai.put_Provider("openai");
    // Use your provider's API key.
    ai.put_ApiKey("MY_API_KEY");
    // Choose a model.
    ai.put_Model("gpt-5-mini");

    // Tool function calling must always occur within a conversation.
    String conversation_name = "convo_astrology";
    String sysMessage = "You are a helpful astrologer";
    String devMessage = "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) {
        Log.i(TAG, ai.lastErrorText());
        return;
        }

    // Get the AI response.
    CkStringBuilder sbResponse = new CkStringBuilder();
    ai.GetOutputTextSb(sbResponse);
    Log.i(TAG, sbResponse.getAsString());

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}

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

// The function name used here must match the "name" in the toolRegistry below.
// Tool functions must ALWAYS have just a single argument, which is an object.
Example.get_stock_quote = function(arg) {
	
	var success = false;

	// Replace with your actual Finnhub API key.
	var apiKey = "YOUR_FINNHUB_API_KEY";
	var symbol = `${arg.symbol}`;

	var http = new CkHttp();

	// This is the URL without params.
	var urlWithoutParams = "https://finnhub.io/api/v1/quote";

	var req = new CkHttpRequest();

	// Add params that will be sent in the URL.
	req.AddParam("symbol",symbol);
	req.AddParam("token",apiKey);

	req.HttpVerb = "GET";

	// Send the request to get the JSON response.
	var resp = new CkHttpResponse();
	success = http.HttpReq(urlWithoutParams,req,resp);
	if (success == false) {
	    return http.LastErrorText;
	}

	var json = new CkJsonObject();
	resp.GetBodyJson(json);

	var statusCode = resp.StatusCode;

	// Sample result:

	// {
	//   "c": 248.8,
	//   "d": -4.09,
	//   "dp": -1.6173,
	//   "h": 255.493,
	//   "l": 248.07,
	//   "o": 253.9,
	//   "pc": 252.89,
	//   "t": 1774641600
	// }

	if (statusCode == 200) {
	    // Add the symbol to the top of the result.
	    json.AddStringAt(0,"symbol",symbol);

	    // Rename members for clarification.
	    json.Rename("c","currentPrice");
	    json.Rename("d","change");
	    json.Rename("dp","percentChange");
	    json.Rename("h","high");
	    json.Rename("l","low");
	    json.Rename("o","open");
	    json.Rename("pc","prevClose");
	    json.Delete("t");
	}

    return json.Emit();
}


// 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_stock_quote",
    description: "Get a current (live) stock quote.",
    parameters: {
      properties: {
		symbol: { type: "string", description: "The stock ticker symbol." }
      },
    }
  }
];


// Indicate the Chilkat objects allowed to be created and used.
// "sandbox" means the object can be used for its intended functionality (such as HTTP),
// but it cannot read or write to the local filesystem. 
 // Any Chilkat method that tries to interact with the local filesystem will fail.
 
 // The other possible permissions are:
 // "readOnly" -- Allows reading files in the local filesystem, and listing directories.
 // "writeOnly" -- Only allows writing files, renaming files, deleting files, but not reading files or getting directory listings.
 // "readWrite" -- Full local filesystem read/write permission.
 // 
 // A JavaScript exception will be thrown if there is an attempt to instantiate a Chilkat object without listed permissions.
 // The keyword "all" can be used for the name, but only if the application's call to RegisterJsTools allows the "all" keyword.
Example.toolPermissions = [
	  {
	    name: "CkHttp",
	    perm: "sandbox",
	  },
	  {
	    name: "CkHttpRequest",
	    perm: "sandbox",
	  },
	  {
	    name: "CkHttpResponse",
	    perm: "sandbox",
	  },
	  {
	    name: "CkDateTime",
	    perm: "sandbox",
	  },
	  {
	    name: "CkJsonObject",
	    perm: "sandbox",
	  }
	];
	
	
// Return the name of this toolset
// This tells Chilkat the namespace of this toolset.
"Example";