{"contract_id":"check_account_state_v1","title":"Check account state","kind":"business_check","purpose":"Read-only verification of user account existence and login capability","applicable_channels":["chat","email"],"required_inputs":["email_or_username"],"allowed_tools":["tool.read_customer_account"],"allowed_actions":["read_account_state"],"prohibited_actions":["modify_account","delete_account","reset_password"],"success_outputs":["account_exists","login_enabled"]}