diff --git a/src/devhelm/_pagination.py b/src/devhelm/_pagination.py
index 7bb0239..be5d2f9 100644
--- a/src/devhelm/_pagination.py
+++ b/src/devhelm/_pagination.py
@@ -23,6 +23,7 @@ class Page(Generic[T]):
     has_prev: bool = False
     total_elements: int | None = None
     total_pages: int | None = None
+    next_cursor: str | None = None
 
 
 @dataclass
@@ -40,17 +41,18 @@ class _PageEnvelope(BaseModel):
     Items are validated separately via ``parse_list(model_class, ...)`` so the
     envelope only describes the surrounding pagination shape; that keeps this
     layer P5-clean (no casts) without forcing every model to be expressed
-    twice. ``extra="forbid"`` so unknown envelope keys surface as a typed
-    ``DevhelmValidationError`` (P1) rather than silently disappearing.
+    twice. ``extra="ignore"`` so additive response fields (``nextCursor``,
+    future envelope keys) cannot break ``list()`` — Postel's Law.
     """
 
-    model_config = ConfigDict(extra="forbid")
+    model_config = ConfigDict(extra="ignore")
 
     data: list[Any] = []  # validated separately
     hasNext: bool = False
     hasPrev: bool = False
     totalElements: int | None = None
     totalPages: int | None = None
+    nextCursor: str | None = None
 
 
 class _CursorPageEnvelope(BaseModel):
@@ -142,6 +144,7 @@ def fetch_page(
         has_prev=envelope.hasPrev,
         total_elements=envelope.totalElements,
         total_pages=envelope.totalPages,
+        next_cursor=envelope.nextCursor,
     )
 
 
diff --git a/tests/test_pagination.py b/tests/test_pagination.py
new file mode 100644
index 0000000..ed483fe
--- /dev/null
+++ b/tests/test_pagination.py
@@ -0,0 +1,34 @@
+"""Offset-page envelope must tolerate additive TableValueResult fields."""
+
+from __future__ import annotations
+
+from devhelm._pagination import _validate_page
+
+
+def test_page_envelope_accepts_next_cursor() -> None:
+    envelope = _validate_page(
+        {
+            "data": [],
+            "hasNext": False,
+            "hasPrev": False,
+            "totalElements": 0,
+            "totalPages": 0,
+            "nextCursor": None,
+        }
+    )
+    assert envelope.nextCursor is None
+    assert envelope.data == []
+
+
+def test_page_envelope_ignores_unknown_keys() -> None:
+    envelope = _validate_page(
+        {"data": [], "hasNext": False, "hasPrev": False, "futureField": True}
+    )
+    assert envelope.hasNext is False
+
+
+def test_page_envelope_leaves_items_unparsed() -> None:
+    envelope = _validate_page(
+        {"data": [{"id": "not-validated-here"}], "hasNext": False, "hasPrev": False}
+    )
+    assert envelope.data[0]["id"] == "not-validated-here"