fix: Remove status field from toolResult for non-claude 3 models in Bedrock model provider

src/strands/models/bedrock.py

@@ -68,6 +68,7 @@ class BedrockConfig(TypedDict, total=False):
             guardrail_redact_output_message: If a Bedrock Output guardrail triggers, replace output with this message.
             max_tokens: Maximum number of tokens to generate in the response
             model_id: The Bedrock model ID (e.g., "us.anthropic.claude-sonnet-4-20250514-v1:0")
+            remove_tool_result_status: Flag to remove status field from tool results. Defaults to False.
             stop_sequences: List of sequences that will stop generation when encountered
             streaming: Flag to enable/disable streaming. Defaults to True.
             temperature: Controls randomness in generation (higher = more random)
@@ -89,6 +90,7 @@ class BedrockConfig(TypedDict, total=False):
         guardrail_redact_output_message: Optional[str]
         max_tokens: Optional[int]
         model_id: str
+        remove_tool_result_status: Optional[bool]
         stop_sequences: Optional[list[str]]
         streaming: Optional[bool]
         temperature: Optional[float]
@@ -276,10 +278,18 @@ def _format_bedrock_messages(self, messages: Messages) -> Messages:
                     # Create a new content block with only the cleaned toolResult
                     tool_result: ToolResult = content_block["toolResult"]
 
-                    # Keep only the required fields for Bedrock
-                    cleaned_tool_result = ToolResult(
-                        content=tool_result["content"], toolUseId=tool_result["toolUseId"], status=tool_result["status"]
-                    )
+                    if self.config.get("remove_tool_result_status", False):
+                        # Remove status field when explicitly configured
+                        cleaned_tool_result = ToolResult(
+                            toolUseId=tool_result["toolUseId"], content=tool_result["content"]
+                        )
+                    else:
+                        # Keep status field by default
+                        cleaned_tool_result = ToolResult(
+                            content=tool_result["content"],
+                            toolUseId=tool_result["toolUseId"],
+                            status=tool_result["status"],
+                        )
 
                     cleaned_block: ContentBlock = {"toolResult": cleaned_tool_result}
                     cleaned_content.append(cleaned_block)

src/strands/types/tools.py

@@ -9,7 +9,7 @@
 from dataclasses import dataclass
 from typing import TYPE_CHECKING, Any, AsyncGenerator, Awaitable, Callable, Literal, Protocol, Union
 
-from typing_extensions import TypedDict
+from typing_extensions import NotRequired, TypedDict
 
 from .media import DocumentContent, ImageContent
 
@@ -91,7 +91,7 @@ class ToolResult(TypedDict):
     """
 
     content: list[ToolResultContent]
-    status: ToolResultStatus
+    status: NotRequired[ToolResultStatus]
     toolUseId: str
 
 

tests/strands/models/test_bedrock.py

@@ -1237,3 +1237,58 @@ def test_format_request_cleans_tool_result_content_blocks(model, model_id):
     assert tool_result == expected
     assert "extraField" not in tool_result
     assert "mcpMetadata" not in tool_result
+
+
+def test_format_request_removes_status_field_when_configured(model, model_id):
+    """Test that format_request removes status field when remove_tool_result_status=True."""
+    # Configure model to remove status field
+    model.update_config(remove_tool_result_status=True)
+
+    messages = [
+        {
+            "role": "user",
+            "content": [
+                {
+                    "toolResult": {
+                        "content": [{"text": "Tool output"}],
+                        "toolUseId": "tool123",
+                        "status": "success",
+                    }
+                },
+            ],
+        }
+    ]
+
+    formatted_request = model.format_request(messages)
+
+    # Verify toolResult does not contain status field when configured to remove
+    tool_result = formatted_request["messages"][0]["content"][0]["toolResult"]
+    expected = {"toolUseId": "tool123", "content": [{"text": "Tool output"}]}
+    assert tool_result == expected
+    assert "status" not in tool_result
+
+
+def test_format_request_keeps_status_field_by_default(model, model_id):
+    """Test that format_request keeps status field by default."""
+    messages = [
+        {
+            "role": "user",
+            "content": [
+                {
+                    "toolResult": {
+                        "content": [{"text": "Tool output"}],
+                        "toolUseId": "tool123",
+                        "status": "success",
+                    }
+                },
+            ],
+        }
+    ]
+
+    formatted_request = model.format_request(messages)
+
+    # Verify toolResult contains status field by default
+    tool_result = formatted_request["messages"][0]["content"][0]["toolResult"]
+    expected = {"content": [{"text": "Tool output"}], "toolUseId": "tool123", "status": "success"}
+    assert tool_result == expected
+    assert "status" in tool_result