diff --git a/litellm/llms/a2a/chat/guardrail_translation/handler.py b/litellm/llms/a2a/chat/guardrail_translation/handler.py
index 921d33f16b6..5dc9679fe78 100644
--- a/litellm/llms/a2a/chat/guardrail_translation/handler.py
+++ b/litellm/llms/a2a/chat/guardrail_translation/handler.py
@@ -14,7 +14,7 @@ import json
 from collections.abc import Sequence
 from typing import TYPE_CHECKING, Any, Final, Optional
 
-from pydantic import ConfigDict, TypeAdapter
+from pydantic import ConfigDict, TypeAdapter, ValidationError
 from typing_extensions import ReadOnly, TypedDict
 
 from litellm._logging import verbose_proxy_logger
@@ -337,7 +337,7 @@ class A2AGuardrailHandler(BaseTranslation):
             elif isinstance(item, str):
                 try:
                     obj = _JSON_OBJECT.validate_python(json.loads(item.strip()))
-                except (json.JSONDecodeError, TypeError):
+                except (json.JSONDecodeError, TypeError, ValidationError):
                     continue
             else:
                 continue
diff --git a/litellm/types/proxy/guardrails/guardrail_hooks/dynamoai.py b/litellm/types/proxy/guardrails/guardrail_hooks/dynamoai.py
index 4cbd252f65c..70d83eeb840 100644
--- a/litellm/types/proxy/guardrails/guardrail_hooks/dynamoai.py
+++ b/litellm/types/proxy/guardrails/guardrail_hooks/dynamoai.py
@@ -5,6 +5,7 @@ from collections.abc import Mapping
 from typing import Literal, TypedDict
 
 from pydantic import Field
+from typing_extensions import ReadOnly
 
 from .base import GuardrailConfigModel
 
@@ -42,7 +43,7 @@ class PolicyApplicableTo(str, enum.Enum):
 class DynamoAIRequest(TypedDict, total=False):
     """Request structure for DynamoAI /moderation/analyze endpoint"""
 
-    messages: list[dict[str, object]]
+    messages: ReadOnly[list[dict[str, object]]]
     textType: DynamoTextType | None
     policyIds: list[str]
     modelId: str | None
@@ -58,8 +59,8 @@ class PolicyInfo(TypedDict, total=False):
     description: str
     method: PolicyMethod
     action: Literal["BLOCK", "WARN", "REDACT", "SANITIZE", "NONE"]
-    methodParams: dict[str, object]
-    decisionParams: dict[str, object]
+    methodParams: ReadOnly[dict[str, object]]
+    decisionParams: ReadOnly[dict[str, object]]
     applicableTo: PolicyApplicableTo
     created_at: str
     creatorId: str
@@ -76,7 +77,7 @@ class AppliedPolicyDto(TypedDict, total=False):
     """Applied policy details from DynamoAI response"""
 
     policy: PolicyInfo
-    outputs: dict[str, object] | None
+    outputs: ReadOnly[dict[str, object] | None]
     action: str | None
 
 
diff --git a/tests/unit/llms/a2a/chat/guardrail_translation/test_a2a_guardrail_handler.py b/tests/unit/llms/a2a/chat/guardrail_translation/test_a2a_guardrail_handler.py
index dd7e8fadcd8..01eff7f6bbf 100644
--- a/tests/unit/llms/a2a/chat/guardrail_translation/test_a2a_guardrail_handler.py
+++ b/tests/unit/llms/a2a/chat/guardrail_translation/test_a2a_guardrail_handler.py
@@ -33,3 +33,7 @@ class TestA2AGuardrailHandlerStreamingScanKey:
     def test_unparseable_items_are_ignored(self):
         key = A2AGuardrailHandler().get_streaming_scan_key([_text_event("hi"), "not json", b"bytes"])
         assert key.texts == ("hi",)
+
+    def test_json_items_that_are_not_objects_are_ignored(self):
+        key = A2AGuardrailHandler().get_streaming_scan_key([_text_event("hi"), "[1, 2]", "5"])
+        assert key.texts == ("hi",)