Class: BaseException

Base class for all structured exceptions in the ADK.

Remarks

Subclasses should declare static code, status, fatal, and optionally help to avoid repeating those values on every instance. Instance-level options always take precedence over static defaults, so a single exception class can still be thrown with per-site overrides when needed.

The runtime cross-realm guard is inlined here rather than imported from ../utils/guards to break a circular-import chain: guards depends on validation, which extends BaseException. Importing the shared isInstanceOf helper into this file would create a load-order cycle that leaves BaseException undefined when ValidationException extends BaseException evaluates.

Extends

• Error

Extended by

• ValidationException

Constructors

Constructor

new BaseException(message?: string, options?: ErrorOptions & {
  code?: string;
  fatal?: boolean;
  status?: number;
}): BaseException;

Parameters

Parameter	Type	Description
message?	string	Human-readable error message. Falls back to the static message on the subclass if omitted.
options?	ErrorOptions & { code?: string; fatal?: boolean; status?: number; }	Standard ErrorOptions extended with code, status, and fatal overrides. Static defaults on the subclass are used when these are absent.

Returns

BaseException

Overrides

Error.constructor;

Properties

Property	Modifier	Type	Description	Overrides
code?	public	string	Machine-readable error code for narrowing exception-handling logic.	-
fatal?	public	boolean	When true, the ADK treats this error as unrecoverable and should halt the agent loop.	-
help?	public	string	Human-readable guidance for resolving or reporting this error.	-
name	public	string	Name of the class that raised the exception.	Error.name
status?	public	number	HTTP status code associated with this error.	-
code?	static	string	Default machine-readable error code inherited by all instances.	-
fatal?	static	boolean	Whether exceptions of this class are fatal by default.	-
help?	static	string	Default help text inherited by all instances unless overridden at the throw site.	-
message?	static	string	Default message used when no message is supplied to the constructor.	-
status?	static	number	Default HTTP status code inherited by all instances.	-

Accessors

[toStringTag]

Get Signature

get toStringTag: string;

Returns

string

Methods

toString()

toString(): string;

Returns a string representation of an object.

Returns

string

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isBaseException()

static isBaseException(value: unknown): value is BaseException;

Returns true if value is a BaseException instance.

Parameters

Parameter	Type	Description
value	unknown	The value to test.

Returns

value is BaseException

true when value is a BaseException instance.

Remarks

Performs cross-realm-safe detection: tries instanceof, then Symbol.hasInstance, then constructor-name comparison. The ADK does not export the BaseException class itself as a constructable value — use this guard plus the BaseException type for runtime detection and TypeScript narrowing.