new feature: mcp pre-validation

templates/agent_template_backend_day_zero/app/state.py

@@ -27,6 +27,7 @@ class AgentState(TypedDict, total=False):
     selected_tool_call: dict[str, Any]
     pending_tool_call: dict[str, Any]
     transaction_status: str
+    transaction_pre_validation: dict[str, Any]
     confirmation_required: bool
     confirmation_received: bool
     tool_policy_result: dict[str, Any]

templates/agent_template_backend_day_zero/config/mcp_parameter_mapping.yaml

@@ -60,6 +60,10 @@ mcp_parameter_mapping:
             mensagem.
           pattern: (?i)\\b(?:pedido|order)\\s*[:#-]?\\s*([A-Z0-9-]+)\\b
           group: 1
+    validar_cancelamento_pedido:
+      map:
+        resource_key: order_id
+
     cancelar_pedido:
       map:
         session_key: session_id

templates/agent_template_backend_day_zero/config/tool_policies.yaml

@@ -11,6 +11,10 @@ tool_policies:
     operation_type: transactional
     require_confirmation: true
     requires: [order_id]
+    pre_validation:
+      enabled: true
+      tool: validar_cancelamento_pedido
+      fail_open: false
 
 
   solicitar_troca:

templates/agent_template_backend_day_zero/config/tools.yaml

@@ -61,6 +61,18 @@ tools:
     - rastreamento
     - transportadora
     - previsão
+  validar_cancelamento_pedido:
+    description: Pre-valida cancelamento do pedido sem executar efeitos transacionais.
+    mcp_server: retail
+    enabled: true
+    tool_type: internal
+    confirmation_required: false
+    requires: [order_id]
+    args_schema:
+      order_id: string
+      target_tool: string
+    selection_keywords: []
+
   cancelar_pedido:
     description: Simula o cancelamento de um pedido de varejo.
     mcp_server: retail