Class Tool

java.lang.Object

com.codename1.ai.Tool

public final class Tool
extends Object

A function the model can call. parametersJsonSchema is a raw JSON-Schema string; each provider wraps it differently on the wire (OpenAI {type:"function",function:{...}}, Anthropic {name,description,input_schema}, Gemini functionDeclarations), but the inner schema shape is the same across all of them, so we hand it through as a string and let the provider client wrap.

Linking a tool to its executor

Pass an optional ToolHandler at construction time and the matching ToolCall can dispatch through it without the caller having to match names by hand:

Tool weather = new Tool(
    "get_weather",
    "Returns the current weather for a location",
    "{\"type\":\"object\",\"properties\":{" +
       "\"location\":{\"type\":\"string\"}}," +
       "\"required\":[\"location\"]}",
    argumentsJson -> {
        Map args = JSONParser.parseJSON(argumentsJson);
        return "{\"temp\":21,\"city\":\""
                + JSONParser.getString(args, "location") + "\"}";
    });

// Later, when the model returns a ToolCall:
for (ToolCall call : response.getToolCalls()) {
    String resultJson = call.execute(Arrays.asList(weather));
    conversation.add(ChatMessage.toolResult(call.getId(), resultJson));
}

The handler is optional -- a Tool constructed without one is a pure description for the model, and the caller can dispatch however they like via the raw ToolCall.getName() / ToolCall.getArgumentsJson() accessors.

Constructor Summary

Constructors

Constructor	Description
Tool(String name, String description, String parametersJsonSchema)
Tool(String name, String description, String parametersJsonSchema, ToolHandler handler)

Method Summary

Modifier and Type	Method	Description
String	getDescription()
ToolHandler	getHandler()	The optional executor wired up by the constructor.
String	getName()
String	getParametersJsonSchema()
String	invoke(String argumentsJson)	Invokes the handler with the given arguments JSON.

Methods inherited from class Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Tool

public Tool(String name,
 String description,
 String parametersJsonSchema)

Tool

public Tool(String name,
 String description,
 String parametersJsonSchema,
 ToolHandler handler)

Method Details

getName

public String getName()

getDescription

public String getDescription()

getParametersJsonSchema

public String getParametersJsonSchema()

getHandler

public ToolHandler getHandler()

The optional executor wired up by the constructor. Returns null for description-only tools.

invoke

public String invoke(String argumentsJson)
              throws Exception

Invokes the handler with the given arguments JSON. Throws IllegalStateException when no handler was registered.

Throws:

Exception