diff --git a/sentry_sdk/integrations/langchain.py b/sentry_sdk/integrations/langchain.py
index 49fa04c034..46bcb39fc0 100644
--- a/sentry_sdk/integrations/langchain.py
+++ b/sentry_sdk/integrations/langchain.py
@@ -21,7 +21,7 @@
 from sentry_sdk.integrations import DidNotEnable, Integration
 from sentry_sdk.scope import should_send_default_pii
 from sentry_sdk.tracing_utils import _get_value, set_span_errored
-from sentry_sdk.utils import capture_internal_exceptions, logger
+from sentry_sdk.utils import capture_internal_exceptions, logger, safe_repr
 
 if TYPE_CHECKING:
     from typing import (
@@ -688,7 +688,9 @@ def on_tool_end(
             span = span_data.span
 
             if should_send_default_pii() and self.include_prompts:
-                set_data_normalized(span, SPANDATA.GEN_AI_TOOL_OUTPUT, output)
+                set_data_normalized(
+                    span, SPANDATA.GEN_AI_TOOL_OUTPUT, safe_repr(output)
+                )
 
             self._exit_span(span_data, run_id)
 
diff --git a/sentry_sdk/integrations/openai_agents/spans/execute_tool.py b/sentry_sdk/integrations/openai_agents/spans/execute_tool.py
index 26072cfdba..12a4fe30a5 100644
--- a/sentry_sdk/integrations/openai_agents/spans/execute_tool.py
+++ b/sentry_sdk/integrations/openai_agents/spans/execute_tool.py
@@ -1,6 +1,7 @@
 import sentry_sdk
 from sentry_sdk.consts import OP, SPANDATA, SPANSTATUS
 from sentry_sdk.scope import should_send_default_pii
+from sentry_sdk.utils import safe_repr
 
 from ..consts import SPAN_ORIGIN
 from ..utils import _set_agent_data
@@ -47,7 +48,7 @@ def update_execute_tool_span(
         span.set_status(SPANSTATUS.INTERNAL_ERROR)
 
     if should_send_default_pii():
-        span.set_data(SPANDATA.GEN_AI_TOOL_OUTPUT, result)
+        span.set_data(SPANDATA.GEN_AI_TOOL_OUTPUT, safe_repr(result))
 
     # Add conversation ID from agent
     conv_id = getattr(agent, "_sentry_conversation_id", None)
diff --git a/sentry_sdk/integrations/openai_agents/utils.py b/sentry_sdk/integrations/openai_agents/utils.py
index ee504b3496..7acc3506be 100644
--- a/sentry_sdk/integrations/openai_agents/utils.py
+++ b/sentry_sdk/integrations/openai_agents/utils.py
@@ -12,7 +12,7 @@
 from sentry_sdk.integrations import DidNotEnable
 from sentry_sdk.scope import should_send_default_pii
 from sentry_sdk.tracing_utils import set_span_errored
-from sentry_sdk.utils import event_from_exception, safe_serialize
+from sentry_sdk.utils import event_from_exception, safe_serialize, safe_repr
 from sentry_sdk.ai._openai_completions_api import _transform_system_instructions
 from sentry_sdk.ai._openai_responses_api import (
     _is_system_instruction,
@@ -231,7 +231,7 @@ def _create_mcp_execute_tool_spans(
                         SPANDATA.GEN_AI_TOOL_INPUT, output.arguments
                     )
                     execute_tool_span.set_data(
-                        SPANDATA.GEN_AI_TOOL_OUTPUT, output.output
+                        SPANDATA.GEN_AI_TOOL_OUTPUT, safe_repr(output.output)
                     )
                 if output.error:
                     execute_tool_span.set_status(SPANSTATUS.INTERNAL_ERROR)
diff --git a/tests/integrations/openai_agents/test_openai_agents.py b/tests/integrations/openai_agents/test_openai_agents.py
index 7310e86df5..b7038dcfb3 100644
--- a/tests/integrations/openai_agents/test_openai_agents.py
+++ b/tests/integrations/openai_agents/test_openai_agents.py
@@ -1273,7 +1273,7 @@ def simple_test_tool(message: str) -> str:
     assert tool_span["data"]["gen_ai.tool.description"] == "A simple tool"
     assert tool_span["data"]["gen_ai.tool.input"] == '{"message": "hello"}'
     assert tool_span["data"]["gen_ai.tool.name"] == "simple_test_tool"
-    assert tool_span["data"]["gen_ai.tool.output"] == "Tool executed with: hello"
+    assert tool_span["data"]["gen_ai.tool.output"] == "'Tool executed with: hello'"
     assert ai_client_span2["description"] == "chat gpt-4"
     assert ai_client_span2["data"]["gen_ai.agent.name"] == "test_agent"
     assert ai_client_span2["data"]["gen_ai.operation.name"] == "chat"
@@ -1904,7 +1904,8 @@ async def test_mcp_tool_execution_spans(
     assert mcp_tool_span["data"]["gen_ai.tool.name"] == "test_mcp_tool"
     assert mcp_tool_span["data"]["gen_ai.tool.input"] == '{"query": "search term"}'
     assert (
-        mcp_tool_span["data"]["gen_ai.tool.output"] == "MCP tool executed successfully"
+        mcp_tool_span["data"]["gen_ai.tool.output"]
+        == "'MCP tool executed successfully'"
     )
 
     # Verify no error status since error was None
@@ -2031,7 +2032,7 @@ async def test_mcp_tool_execution_with_error(
     assert mcp_tool_span["description"] == "execute_tool failing_mcp_tool"
     assert mcp_tool_span["data"]["gen_ai.tool.name"] == "failing_mcp_tool"
     assert mcp_tool_span["data"]["gen_ai.tool.input"] == '{"query": "test"}'
-    assert mcp_tool_span["data"]["gen_ai.tool.output"] is None
+    assert mcp_tool_span["data"]["gen_ai.tool.output"] == "None"
 
     # Verify error status was set
     assert mcp_tool_span["status"] == "internal_error"