停止条件

$agent = AgentSdk::createAgent(new AgentDefinition(
    id: "bounded-research",
    model: "openai/gpt-5.4-nano",
    stopWhen: [
        AgentSdk::stepCountIs(12),
        AgentSdk::maxTokensUsed(40000),
        AgentSdk::maxCost(2.50),
        AgentSdk::maxDuration(120000),
    ]
));