--gateway-url "https://myfirstagentgateway- 12abcdefgh.gateway.bedrock-agentcore.us-east- 1.amazonaws.com/mcp" --role-arn "arn:aws:iam::123456789012:role/AgentCoreGatewayEx ecutionRole" --name TestLambdaTarget --target-type lambda --region us-east-1 aws cognito-idp describe-user-pool-client --user-pool-id us-east-1_1AbC0deFG --client-id 1abc2def3ghi4jklmno5p6qr78 --region us-east-1 --query 'UserPoolClient.ClientSecret' --output text