Package org.a2aproject.sdk.server.version

Class A2AVersionValidator

java.lang.Object

org.a2aproject.sdk.server.version.A2AVersionValidator

public class A2AVersionValidator
extends Object

Utility class for validating A2A protocol version compatibility between clients and agents.

Version validation follows semantic versioning rules:

• Major versions must match exactly (1.x can only talk to 1.x)
• Minor versions are compatible (1.0 client can talk to 1.1 server and vice versa)

Per A2A spec Section 3.6.2, if the client does not specify a version, version "0.3" is assumed for backward compatibility.

Constructor Summary

Constructors

Constructor	Description
A2AVersionValidator()

Method Summary

Modifier and Type	Method	Description
static void	validateProtocolVersion(AgentCard agentCard, ServerCallContext context)	Validates that the client's requested protocol version is compatible with the agent's supported versions across all interfaces.

Methods inherited from class java.lang.Object

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

Constructor Details

A2AVersionValidator

public A2AVersionValidator()

Method Details

validateProtocolVersion

public static void validateProtocolVersion(AgentCard agentCard,
 ServerCallContext context)
                                    throws VersionNotSupportedError

Validates that the client's requested protocol version is compatible with the agent's supported versions across all interfaces.

Parameters:

agentCard - the agent card containing the supported interfaces with their protocol versions

context - the server call context containing the requested protocol version

Throws:

VersionNotSupportedError - if the versions are incompatible