Rust Requires Chilkat v11.4.0+
Rust
Demonstrates Manual Tool Function Calls
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Demonstrates how to do manual tool function calling using Chilkat. This is where your application manually checks for function calls in the AI's response, makes the function calls, and returns the function call results to the AI.Chilkat Rust Downloads
// 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 two functions 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"
// }
// }
// }
// },
// {
// "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)"
// }
// }
// }
// }
// ]
// }
let json_tools = chilkat::JsonObject::new();
let mut tool_idx = 0;
json_tools.set_i(tool_idx);
let _ = json_tools.update_string("tools[i].name", "get_horoscope");
let _ = json_tools.update_string("tools[i].description", "Get today's horoscope for an astrological sign.");
let _ = json_tools.update_string("tools[i].parameters.properties.sign.type", "string");
let _ = json_tools.update_string("tools[i].parameters.properties.sign.description", "An astrological sign like Taurus or Aquarius");
tool_idx = tool_idx + 1;
json_tools.set_i(tool_idx);
let _ = json_tools.update_string("tools[i].name", "get_compatibility");
let _ = json_tools.update_string("tools[i].description", "Returns compatibility analysis between two zodiac signs, including a score and explanation.");
let _ = json_tools.update_string("tools[i].parameters.properties.sign1.type", "string");
let _ = json_tools.update_string("tools[i].parameters.properties.sign1.description", "The first zodiac sign (e.g., Aries, Taurus, Gemini).");
let _ = json_tools.update_string("tools[i].parameters.properties.sign2.type", "string");
let _ = json_tools.update_string("tools[i].parameters.properties.sign2.description", "The second zodiac sign (e.g., Aries, Taurus, Gemini).");
let _ = json_tools.update_string("tools[i].parameters.properties.relationship_type.type", "string");
let _ = json_tools.update_string("tools[i].parameters.properties.relationship_type.description", "Type of compatibility to evaluate. (e.g., romantic, friendship, professional, general)");
let _ = json_tools.update_string("tools[i].parameters.properties.detail_level.type", "string");
let _ = json_tools.update_string("tools[i].parameters.properties.detail_level.description", "Level of detail in the response. (e.g., short, medium, detailed)");
// More tools can be added as desired..
json_tools.set_emit_compact(false);
println!("{}", json_tools.emit().unwrap_or_default());
let ai = chilkat::Ai::new();
// Register the tools that will be made available to the AI.
let _ = ai.register_manual_tools(&json_tools);
// The provider can be "openai", "google", "claude", "grok", "mistral", "custom", etc.
ai.set_provider("openai");
// Use your provider's API key.
ai.set_api_key("MY_API_KEY");
// Choose a model.
ai.set_model("gpt-5.6-luna");
// Tool function calling must always occur within a conversation.
let conversation_name = "convo_astrology".to_string();
let sys_message = "You are a helpful astrologer".to_string();
let dev_message = "Respond only with a horoscope generated by a tool. Use the tool output as the final answer.".to_string();
let _ = ai.new_convo(&conversation_name, &sys_message, &dev_message);
// Provide inputs
let _ = ai.input_add_text("What is my horoscope? I am an Aquarius.");
// Send inputs, tool functions, etc. and ask for a "text" response.
if ai.ask("text").is_err() {
println!("{}", ai.last_error_text());
return;
}
// Did the AI respond with requests for tool function calls?
if ai.has_function_calls() {
let json_fn = chilkat::JsonObject::new();
json_fn.set_emit_compact(false);
let _ = ai.get_function_calls(&json_fn);
println!("{}", json_fn.emit().unwrap_or_default());
// 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"
// }
// }
// ]
// }
let num_fn_calls = json_fn.size_of_array("function_call");
let mut fn_idx = 0;
while fn_idx < num_fn_calls {
json_fn.set_i(fn_idx);
let sb_fn_name = chilkat::StringBuilder::new();
let _ = json_fn.string_of_sb("function_call[i].name", &sb_fn_name);
let call_id = json_fn.string_of("function_call[i].call_id").unwrap_or_default();
if sb_fn_name.contents_equal("get_horoscope", true) {
// The get_horoscope function (as defined above) has one argument named "sign".
let zodiac_sign = json_fn.string_of("function_call[i].args.sign").unwrap_or_default();
println!("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:
let application_fn_call_result = "Aquarius: Next Tuesday you will befriend a baby otter.".to_string();
// Provide the tool call result as an input for the followup Ask.
let _ = ai.input_add_fn_result(&call_id, &application_fn_call_result);
}
// Your application would add code to check for and handle each possible function call.
fn_idx = fn_idx + 1;
}
// After making the requested tool function calls, send the results back to the AI.
if ai.ask("text").is_err() {
println!("{}", ai.last_error_text());
return;
}
}
// Get the final AI response.
let sb_response = chilkat::StringBuilder::new();
let _ = ai.get_output_text_sb(&sb_response);
println!("{}", sb_response.get_as_string().unwrap_or_default());