Class BaseTool

java.lang.Object

com.google.adk.tools.BaseTool

Direct Known Subclasses:

AbstractMcpTool, AgentTool, BaseRetrievalTool, BuiltInCodeExecutionTool, ExampleTool, FunctionTool, GoogleMapsTool, GoogleSearchTool, IntegrationConnectorTool, LoadArtifactsTool, UrlContextTool, VertexAiSearchTool

public abstract class BaseTool
extends Object

The base class for all ADK tools.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	BaseTool.ToolArgsConfig	Configuration class for tool arguments that allows arbitrary key-value pairs.
static class	BaseTool.ToolConfig	Configuration class for a tool definition in YAML/JSON.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	BaseTool(String name, String description)
protected	BaseTool(String name, String description, boolean isLongRunning)

Method Summary

Modifier and Type	Method	Description
com.google.common.collect.ImmutableMap<String,Object>	customMetadata()	Returns a read-only view of the tool metadata.
Optional<com.google.genai.types.FunctionDeclaration>	declaration()	Gets the FunctionDeclaration representation of this tool.
String	description()
static BaseTool	fromConfig(BaseTool.ToolConfig config, String configAbsPath)	Creates a tool instance from a config.
boolean	longRunning()
String	name()
io.reactivex.rxjava3.core.Completable	processLlmRequest(LlmRequest.Builder llmRequestBuilder, ToolContext toolContext)	Processes the outgoing LlmRequest.Builder.
io.reactivex.rxjava3.core.Single<Map<String,Object>>	runAsync(Map<String,Object> args, ToolContext toolContext)	Calls a tool.
void	setCustomMetadata(String key, Object value)	Sets custom metadata to the tool associated with a key.

Methods inherited from class Object

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

Constructor Details

BaseTool

protected BaseTool(@Nonnull
 String name,
 @Nonnull
 String description)

BaseTool

protected BaseTool(@Nonnull
 String name,
 @Nonnull
 String description,
 boolean isLongRunning)

Method Details

name

public String name()

description

public String description()

longRunning

public boolean longRunning()

declaration

public Optional<com.google.genai.types.FunctionDeclaration> declaration()

Gets the FunctionDeclaration representation of this tool.

customMetadata

public com.google.common.collect.ImmutableMap<String,Object> customMetadata()

Returns a read-only view of the tool metadata.

setCustomMetadata

public void setCustomMetadata(String key,
 Object value)

Sets custom metadata to the tool associated with a key.

runAsync

public io.reactivex.rxjava3.core.Single<Map<String,Object>> runAsync(Map<String,Object> args,
 ToolContext toolContext)

Calls a tool.

processLlmRequest

@CanIgnoreReturnValue
public io.reactivex.rxjava3.core.Completable processLlmRequest(LlmRequest.Builder llmRequestBuilder,
 ToolContext toolContext)

Processes the outgoing LlmRequest.Builder.

This implementation adds the current tool's declaration() to the GenerateContentConfig within the builder. If a tool with function declarations already exists, the current tool's declaration is merged into it. Otherwise, a new tool definition with the current tool's declaration is created. The current tool itself is also added to the builder's internal list of tools. Override this method for processing the outgoing request.

fromConfig

public static BaseTool fromConfig(BaseTool.ToolConfig config,
 String configAbsPath)
                           throws ConfigAgentUtils.ConfigurationException

Creates a tool instance from a config.

Subclasses should override and implement this method to do custom initialization from a config.

Parameters:

config - The config for the tool.

configAbsPath - The absolute path to the config file that contains the tool config.

Returns:

The tool instance.

Throws:

ConfigAgentUtils.ConfigurationException - if the tool cannot be created from the config.