diff --git a/evalharness/sandbox/base.py b/evalharness/sandbox/base.py
index da9b397..edb93ed 100644
--- a/evalharness/sandbox/base.py
+++ b/evalharness/sandbox/base.py
@@ -65,6 +65,8 @@ class Sandbox:
         mounts: Optional[Dict[str, str]] = None,
         timeout_s: int = 60,
         image: str = '',
+        entrypoint: str = '',   # docker-only override; accepted for
+                                # signature parity (local runs a plain python)
     ) -> ExecResult:
         """Run ``python <entry>`` with ``files`` (name->content) in isolation.
 
diff --git a/evalharness/sandbox/local.py b/evalharness/sandbox/local.py
index 45bec84..a5ad23a 100644
--- a/evalharness/sandbox/local.py
+++ b/evalharness/sandbox/local.py
@@ -25,6 +25,8 @@ class LocalSandbox(Sandbox):
         mounts: Optional[Dict[str, str]] = None,
         timeout_s: int = 60,
         image: str = '',
+        entrypoint: str = '',   # docker-only override; accepted for
+                                # signature parity (local runs a plain python)
     ) -> ExecResult:
         with tempfile.TemporaryDirectory(prefix='eh-local-') as td:
             work = Path(td)