(Android™) Automatic JavaScript AI Tool Function Calling

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.
    // -----------------------------------------------------------------------------------

    // 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.
    CkStringBuilder sbJs = new CkStringBuilder();
    success = sbJs.LoadFile("qa_data/js_tools/horoscope_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 = true;
    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 = {};

// ----------------------------
// 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";