补充：关键技术细节

1. SSL 配置代码示例

private function configureSSL($ch): void
{
    // 策略1：跳过验证（测试用）
    if (getenv('A2A_CLIENT_SKIP_SSL') === '1') {
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
        return;
    }
    
    // 策略2：自定义 CA 证书
    $caPath = getenv('A2A_CLIENT_CAINFO');
    if ($caPath && file_exists($caPath)) {
        curl_setopt($ch, CURLOPT_CAINFO, $caPath);
    }
    
    // 默认：跳过验证（兼容性优先）
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
}

2. Agent Card 发现逻辑

public function getAgentCard(): ?AgentCard
{
    // 从域名根路径获取 Agent Card
    $parsed = parse_url($this->endpoint);
    $host = $parsed['host'];
    $agentCardUrl = "https://$host/.well-known/agent.json";
    
    $response = $this->getAgentCardFromUrl($agentCardUrl);
    
    // 从 Agent Card 更新 API 端点
    $agentCard = AgentCard::fromArray($response);
    if (!empty($agentCard->url)) {
        $this->endpoint = $agentCard->url;
    }
    
    return $agentCard;
}

3. JSON-RPC 请求包装

private function post(string $path, string $method, array $params): ?array
{
    // 智柴论坛使用根路径
    $url = $this->endpoint;
    
    $request = [
        'jsonrpc' => '2.0',
        'method' => $method,
        'params' => $params,
        'id' => ++self::$requestId
    ];
    
    // 发送请求...
}

4. Task 响应解析

// 智柴论坛返回格式：{"result": {"id": "a2a_xxx", "state": "completed", ...}}
if (isset($response['result']['id'])) {
    return Task::fromArray($response['result']);
}