diff --git a/sentry_sdk/integrations/mcp.py b/sentry_sdk/integrations/mcp.py
index 5781a58bb6..b45ec84716 100644
--- a/sentry_sdk/integrations/mcp.py
+++ b/sentry_sdk/integrations/mcp.py
@@ -430,8 +430,6 @@ async def _tool_handler_wrapper(
                     result = await result
 
             except Exception as e:
-                # Set error flag for tools
-                _set_span_data_attribute(span, SPANDATA.MCP_TOOL_RESULT_IS_ERROR, True)
                 sentry_sdk.capture_exception(e)
                 raise
 
diff --git a/tests/integrations/fastmcp/test_fastmcp.py b/tests/integrations/fastmcp/test_fastmcp.py
index 9dad6f08ef..efddce684a 100644
--- a/tests/integrations/fastmcp/test_fastmcp.py
+++ b/tests/integrations/fastmcp/test_fastmcp.py
@@ -560,9 +560,6 @@ def failing_tool(value: int) -> int:
         error_event = error_events[0]
         assert error_event["exception"]["values"][0]["type"] == "ValueError"
         assert error_event["exception"]["values"][0]["value"] == "Tool execution failed"
-
-        # Verify span is marked with error
-        assert tool_spans[0]["attributes"][SPANDATA.MCP_TOOL_RESULT_IS_ERROR] is True
     else:
         events = capture_events()
         with start_transaction(name="fastmcp tx"):
@@ -592,9 +589,6 @@ def failing_tool(value: int) -> int:
         assert error_event["exception"]["values"][0]["type"] == "ValueError"
         assert error_event["exception"]["values"][0]["value"] == "Tool execution failed"
 
-        # Verify span is marked with error
-        assert tool_spans[0]["data"][SPANDATA.MCP_TOOL_RESULT_IS_ERROR] is True
-
 
 @pytest.mark.asyncio
 @pytest.mark.parametrize("FastMCP", fastmcp_implementations, ids=fastmcp_ids)
diff --git a/tests/integrations/mcp/test_mcp.py b/tests/integrations/mcp/test_mcp.py
index 8fe82ee0be..ccb1322afa 100644
--- a/tests/integrations/mcp/test_mcp.py
+++ b/tests/integrations/mcp/test_mcp.py
@@ -634,7 +634,6 @@ def failing_tool(tool_name, arguments):
             error_payload["exception"]["values"][0]["value"] == "Tool execution failed"
         )
 
-        assert span["attributes"][SPANDATA.MCP_TOOL_RESULT_IS_ERROR] is True
         assert span["status"] == "error"
     else:
         events = capture_events()
@@ -669,8 +668,6 @@ def failing_tool(tool_name, arguments):
         assert len(tx["spans"]) == 1
         span = tx["spans"][0]
 
-        # Error flag should be set for tools
-        assert span["data"][SPANDATA.MCP_TOOL_RESULT_IS_ERROR] is True
         assert span["status"] == "internal_error"
         assert span["tags"]["status"] == "internal_error"
 
@@ -963,7 +960,6 @@ async def failing_prompt(name, arguments):
         assert error_payload["level"] == "error"
         assert error_payload["exception"]["values"][0]["type"] == "RuntimeError"
         assert span["status"] == "error"
-        assert SPANDATA.MCP_TOOL_RESULT_IS_ERROR not in span["attributes"]
     else:
         events = capture_events()
         with start_transaction(name="mcp tx"):
@@ -992,7 +988,6 @@ async def failing_prompt(name, arguments):
         span = tx["spans"][0]
 
         assert span["status"] == "internal_error"
-        assert SPANDATA.MCP_TOOL_RESULT_IS_ERROR not in span["data"]
 
 
 @pytest.mark.asyncio
@@ -1250,7 +1245,6 @@ def failing_resource(uri):
         assert error_payload["level"] == "error"
         assert error_payload["exception"]["values"][0]["type"] == "FileNotFoundError"
         assert span["status"] == "error"
-        assert SPANDATA.MCP_TOOL_RESULT_IS_ERROR not in span["attributes"]
     else:
         events = capture_events()
         with start_transaction(name="mcp tx"):
@@ -1276,7 +1270,6 @@ def failing_resource(uri):
         span = tx["spans"][0]
 
         assert span["status"] == "internal_error"
-        assert SPANDATA.MCP_TOOL_RESULT_IS_ERROR not in span["data"]
 
 
 @pytest.mark.asyncio