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diff --git a/app/domain/contas/invoice_context.py b/app/domain/contas/invoice_context.py
index 2f5c802..282d6db 100644
--- a/app/domain/contas/invoice_context.py
+++ b/app/domain/contas/invoice_context.py
@@ -19,6 +19,10 @@ class InvoiceContext:
     complete_invoices: dict[str, Any] | None = None
     billing_analysis: dict[str, Any] | None = None
     invoice_detail: Any = None
+    invoice_amount: str = ""
+    invoice_amount_open: str = ""
+    invoice_period: str = ""
+    invoice_emissao: str = ""
     customer_id: str = ""
     error: str | None = None
     cache_hit: bool = False
@@ -33,6 +37,10 @@ class InvoiceContext:
             "complete_invoices_payload": self.complete_invoices,
             "billing_analysis": self.billing_analysis,
             "invoice_detail": self.invoice_detail,
+            "invoice_amount": self.invoice_amount,
+            "invoice_amount_open": self.invoice_amount_open,
+            "invoice_period": self.invoice_period,
+            "invoice_emissao": self.invoice_emissao,
             "customer_id": self.customer_id,
             "invoice_context_error": self.error,
             "invoice_context_cache_hit": self.cache_hit,
@@ -42,6 +50,55 @@ class InvoiceContext:
         }
 
 
+def extract_invoice_summary_context(detail: Any) -> dict[str, str]:
+    """Extrai o resumo semântico da fatura detalhada.
+
+    Mantém a paridade com o prefetch do Contas original: ``bill_pdf`` devolve
+    um envelope com ``parsed_content`` e o parser coloca o total em
+    ``total_geral``. Workflows e agentes não precisam conhecer a estrutura do
+    PDF para consumir ``invoice_amount``/``invoice_amount_open``.
+    """
+    parsed = detail
+    if isinstance(detail, dict) and isinstance(detail.get("parsed_content"), dict):
+        parsed = detail["parsed_content"]
+    if not isinstance(parsed, dict):
+        return {}
+
+    resumo = parsed.get("Fatura Resumo")
+    if not isinstance(resumo, list):
+        resumo = []
+
+    invoice_period = ""
+    invoice_emissao = ""
+    invoice_amount = ""
+    parsed_total = parsed.get("total_geral")
+    if parsed_total is not None and str(parsed_total).strip():
+        invoice_amount = str(parsed_total).strip()
+
+    for item in resumo:
+        if not isinstance(item, dict):
+            continue
+        desc = str(item.get("desc", "") or "").strip().casefold()
+        if desc in {"período", "periodo"}:
+            invoice_period = str(item.get("period", "") or "").strip()
+        elif desc in {"emissão", "emissao"}:
+            invoice_emissao = str(item.get("emissao", "") or "").strip()
+        if not invoice_amount and bool(item.get("is_total")) and str(item.get("value", "")).strip():
+            invoice_amount = str(item.get("value", "")).strip()
+        if not invoice_amount and "total" in desc and str(item.get("value", "")).strip():
+            invoice_amount = str(item.get("value", "")).strip()
+
+    context: dict[str, str] = {}
+    if invoice_period:
+        context["invoice_period"] = invoice_period
+    if invoice_emissao:
+        context["invoice_emissao"] = invoice_emissao
+    if invoice_amount:
+        context["invoice_amount"] = invoice_amount
+        context["invoice_amount_open"] = invoice_amount
+    return context
+
+
 class InvoiceContextService:
     """Session-scoped invoice prefetch backed by the framework cache.
 
@@ -155,6 +212,7 @@ class InvoiceContextService:
 
         detail = None
         detail_ms = 0.0
+        summary: dict[str, str] = {}
         if include_detail and resolved_invoice_id:
             detail, detail_error, detail_ms = await self._timed_to_thread(
                 "invoice_detail", self.client.bill_pdf, msisdn, resolved_invoice_id, customer_id,
@@ -163,6 +221,8 @@ class InvoiceContextService:
             if detail_error:
                 errors["invoice_detail"] = detail_error
                 error_parts.append(f"invoice_detail: {detail_error}")
+            else:
+                summary = extract_invoice_summary_context(detail)
 
         metadata = {
             "cache_hit": False,
@@ -177,7 +237,12 @@ class InvoiceContextService:
             msisdn=msisdn, invoice_id=resolved_invoice_id,
             complete_invoices=complete if isinstance(complete, dict) else None,
             billing_analysis=billing if isinstance(billing, dict) else None,
-            invoice_detail=detail, customer_id=customer_id,
+            invoice_detail=detail,
+            invoice_amount=summary.get("invoice_amount", ""),
+            invoice_amount_open=summary.get("invoice_amount_open", ""),
+            invoice_period=summary.get("invoice_period", ""),
+            invoice_emissao=summary.get("invoice_emissao", ""),
+            customer_id=customer_id,
             error="; ".join(error_parts) or None, cache_hit=False, business_events=events, errors=errors, metadata=metadata,
         )
 
@@ -219,7 +284,10 @@ class InvoiceContextService:
             await self.cache.set(key, {
                 "msisdn": ctx.msisdn, "invoice_id": ctx.invoice_id,
                 "complete_invoices": ctx.complete_invoices, "billing_analysis": ctx.billing_analysis,
-                "invoice_detail": ctx.invoice_detail, "customer_id": ctx.customer_id,
+                "invoice_detail": ctx.invoice_detail,
+                "invoice_amount": ctx.invoice_amount, "invoice_amount_open": ctx.invoice_amount_open,
+                "invoice_period": ctx.invoice_period, "invoice_emissao": ctx.invoice_emissao,
+                "customer_id": ctx.customer_id,
                 "error": ctx.error, "cache_hit": False,
                 "errors": dict(ctx.errors or {}), "metadata": dict(ctx.metadata or {}),
                 "_fetched_at": time.time(),
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diff --git a/app/domain/contas/service.py b/app/domain/contas/service.py
index c364b95..38ab459 100644
--- a/app/domain/contas/service.py
+++ b/app/domain/contas/service.py
@@ -36,8 +36,29 @@ class ContasDomainService:
         partial = [p for p in products if needle in str(p.get("name") or p.get("description") or "").lower() or str(p.get("name") or p.get("description") or "").lower() in needle]
         return partial[0] if partial else None
 
-    def consultar_faturas(self, *, msisdn: str, **_: Any) -> Any:
-        return self.client.consultar_faturas(msisdn)
+    def consultar_faturas(self, *, msisdn: str, **args: Any) -> Any:
+        """Consulta faturas e expõe o resumo semântico quando pré-carregado.
+
+        A fonte de ``invoice_amount`` continua sendo a fatura detalhada (Bill PDF),
+        como no Contas original. O MCP apenas apresenta esse dado junto do retorno
+        de Complete Invoices; não altera o contrato do backend TIM nem inventa valor.
+        """
+        complete = args.get("complete_invoices_payload")
+        if not isinstance(complete, dict):
+            complete = self.client.consultar_faturas(msisdn)
+        if not isinstance(complete, dict):
+            return complete
+
+        result = dict(complete)
+        for key in ("invoice_amount", "invoice_amount_open", "invoice_period", "invoice_emissao"):
+            value = args.get(key)
+            if value not in (None, ""):
+                result[key] = value
+        if args.get("invoice_id") not in (None, ""):
+            result.setdefault("invoice_id", args.get("invoice_id"))
+        if args.get("customer_id") not in (None, ""):
+            result.setdefault("customer_id", args.get("customer_id"))
+        return result
 
     def consultar_plano(self, *, msisdn: str, **args: Any) -> dict[str, Any]:
         """Retorna somente os planos presentes na evidência de billing analysis.
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diff --git a/contas_mcp/servers/contas_mcp_server/main.py b/contas_mcp/servers/contas_mcp_server/main.py
index 8af27d6..6e51f5f 100644
--- a/contas_mcp/servers/contas_mcp_server/main.py
+++ b/contas_mcp/servers/contas_mcp_server/main.py
@@ -71,7 +71,7 @@ class ToolCall(BaseModel):
 
 
 TOOLS: dict[str, dict[str, Any]] = {
-    "consultar_faturas": {"description": "Consulta faturas do cliente.", "input_schema": {"msisdn": "string"}},
+    "consultar_faturas": {"description": "Consulta faturas do cliente, incluindo valor total quando disponível na fatura detalhada.", "input_schema": {"msisdn": "string"}},
     "consultar_plano": {"description": "Consulta exclusivamente o plano ou planos contratados presentes na fatura.", "input_schema": {"msisdn": "string"}},
     "invoice_explanation": {"description": "Executa o workflow de explicação de fatura com pause/resume pelo WorkflowRuntime do framework.", "input_schema": {"msisdn": "string"}},
     "consultar_vas": {"description": "Consulta VAS ativos.", "input_schema": {"msisdn": "string"}},
@@ -307,17 +307,22 @@ def _preflight_subject(name: str, args: dict[str, Any]) -> dict[str, Any] | None
     return None
 
 async def _enrich_invoice_context(name: str, args: dict[str, Any]) -> None:
-    if name not in {"consultar_plano", "invoice_explanation", "cancelar_vas_avulso", "tratar_vas_estrategico", "contestar_cobranca"}:
+    if name not in {"consultar_faturas", "consultar_plano", "invoice_explanation", "cancelar_vas_avulso", "tratar_vas_estrategico", "contestar_cobranca"}:
         return
     msisdn = str(args.get("msisdn") or "").strip()
     if not msisdn:
         return
-    # If all required evidence is already present, preserve it exactly.
-    if isinstance(args.get("complete_invoices_payload"), dict) and isinstance(args.get("billing_analysis"), dict):
+    # If all required evidence is already present, preserve it exactly. For
+    # consultar_faturas/invoice_explanation the semantic amount also matters, so
+    # a cached pair without detail must still be enriched.
+    has_base = isinstance(args.get("complete_invoices_payload"), dict) and isinstance(args.get("billing_analysis"), dict)
+    needs_detail = name in {"consultar_faturas", "invoice_explanation", "cancelar_vas_avulso", "contestar_cobranca"}
+    has_detail = isinstance(args.get("invoice_detail"), dict) or args.get("invoice_amount") not in (None, "")
+    if has_base and (not needs_detail or has_detail):
         return
     session_id = str(args.get("session_id") or args.get("original_session_id") or args.get("conversation_key") or "").strip()
     invoice_id = str(args.get("invoice_id") or args.get("current_invoice_number") or "").strip()
-    include_detail = name in {"cancelar_vas_avulso", "contestar_cobranca"} and not isinstance(args.get("invoice_detail"), dict)
+    include_detail = name in {"consultar_faturas", "invoice_explanation", "cancelar_vas_avulso", "contestar_cobranca"} and not isinstance(args.get("invoice_detail"), dict)
     try:
         ctx = await get_invoice_context_service().get(
             session_id=session_id,
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diff --git a/tests/migration/test_invoice_context_framework_native.py b/tests/migration/test_invoice_context_framework_native.py
index a07d589..9c9019a 100644
--- a/tests/migration/test_invoice_context_framework_native.py
+++ b/tests/migration/test_invoice_context_framework_native.py
@@ -25,7 +25,16 @@ class Client:
 
     def bill_pdf(self, msisdn, invoice_id, customer_id, **kwargs):
         self.pdf_calls += 1
-        return {"119": {"SVA Detalhe Total": [{"desc": "Tamboro"}]}}
+        return {
+            "status": "SUCCESS",
+            "parsed_content": {
+                "total_geral": 191.97,
+                "Fatura Resumo": [
+                    {"desc": "Período", "period": "01/04/2026 a 30/04/2026"},
+                    {"desc": "Emissão", "emissao": "01/04/2026"},
+                ],
+            },
+        }
 
 
 @pytest.mark.asyncio
@@ -196,3 +205,73 @@ async def test_invoice_context_cache_hit_expoe_cache_age_sem_republicar_eventos(
     assert cached.metadata["cache_hit"] is True
     assert cached.metadata["cache_age_ms"] >= 0
     assert cached.business_events == []
+
+
+def test_extract_invoice_summary_context_restaura_semantica_do_original():
+    from app.domain.contas.invoice_context import extract_invoice_summary_context
+
+    result = extract_invoice_summary_context({
+        "parsed_content": {
+            "total_geral": 191.97,
+            "Fatura Resumo": [
+                {"desc": "Período", "period": "01/04/2026 a 30/04/2026"},
+                {"desc": "Emissão", "emissao": "01/04/2026"},
+            ],
+        }
+    })
+    assert result == {
+        "invoice_amount": "191.97",
+        "invoice_amount_open": "191.97",
+        "invoice_period": "01/04/2026 a 30/04/2026",
+        "invoice_emissao": "01/04/2026",
+    }
+
+
+@pytest.mark.asyncio
+async def test_invoice_context_detail_expoe_invoice_amount_semantico():
+    client = Client()
+    svc = InvoiceContextService(client, InMemoryCache(), ttl_seconds=60)  # type: ignore[arg-type]
+    ctx = await svc.get(session_id="s1", msisdn="119", include_detail=True)
+    assert ctx.invoice_amount == "191.97"
+    assert ctx.invoice_amount_open == "191.97"
+    assert ctx.invoice_period == "01/04/2026 a 30/04/2026"
+    assert ctx.invoice_emissao == "01/04/2026"
+    assert ctx.as_dict()["invoice_amount"] == "191.97"
+
+
+def test_consultar_faturas_reusa_prefetch_e_publica_valor_sem_reconsultar_backend():
+    from app.domain.contas.service import ContasDomainService
+
+    class C(Client):
+        def consultar_faturas(self, msisdn):
+            raise AssertionError("nao deveria consultar novamente")
+
+    svc = ContasDomainService(client=C())  # type: ignore[arg-type]
+    result = svc.consultar_faturas(
+        msisdn="119",
+        complete_invoices_payload={"paymentItems": [{"invoiceId": "I1"}]},
+        invoice_id="I1",
+        customer_id="C1",
+        invoice_amount="191.97",
+        invoice_amount_open="191.97",
+    )
+    assert result["invoice_amount"] == "191.97"
+    assert result["invoice_amount_open"] == "191.97"
+    assert result["invoice_id"] == "I1"
+    assert result["customer_id"] == "C1"
+
+@pytest.mark.asyncio
+async def test_mcp_consultar_faturas_enriquece_com_detail_e_valor(monkeypatch):
+    from contas_mcp.servers.contas_mcp_server import main
+
+    client = Client()
+    context_service = InvoiceContextService(client, InMemoryCache(), ttl_seconds=60)  # type: ignore[arg-type]
+    monkeypatch.setattr(main, "get_invoice_context_service", lambda: context_service)
+
+    args = {"msisdn": "119", "session_id": "s1", "message_id": "m1"}
+    await main._enrich_invoice_context("consultar_faturas", args)
+
+    assert client.pdf_calls == 1
+    assert args["invoice_amount"] == "191.97"
+    assert args["invoice_amount_open"] == "191.97"
+    assert args["complete_invoices_payload"]["paymentItems"][0]["invoiceId"] == "I1"