Add toolchain from agentic system here

toolchain/safety/shields/contrib/third_party_shield.py

@@ -0,0 +1,28 @@
+import sys
+from typing import List
+
+from models.llama3.datatypes import Message
+
+parent_dir = "../.."
+sys.path.append(parent_dir)
+from toolchain.safety.shields.base import OnViolationAction, ShieldBase, ShieldResponse
+
+_INSTANCE = None
+
+
+class ThirdPartyShield(ShieldBase):
+    @staticmethod
+    def instance(on_violation_action=OnViolationAction.RAISE) -> "ThirdPartyShield":
+        global _INSTANCE
+        if _INSTANCE is None:
+            _INSTANCE = ThirdPartyShield(on_violation_action)
+        return _INSTANCE
+
+    def __init__(
+        self,
+        on_violation_action: OnViolationAction = OnViolationAction.RAISE,
+    ):
+        super().__init__(on_violation_action)
+
+    async def run(self, messages: List[Message]) -> ShieldResponse:
+        super.run()  # will raise NotImplementedError