diff --git a/python/packages/ollama/agent_framework_ollama/_chat_client.py b/python/packages/ollama/agent_framework_ollama/_chat_client.py
index 94e612f75db..9d447c6a98f 100644
--- a/python/packages/ollama/agent_framework_ollama/_chat_client.py
+++ b/python/packages/ollama/agent_framework_ollama/_chat_client.py
@@ -400,8 +400,16 @@ def _prepare_options(self, messages: Sequence[Message], options: Mapping[str, An
 
             messages = prepend_instructions_to_messages(list(messages), instructions, role="system")
 
-        # Keys to exclude from processing
-        exclude_keys = {"instructions", "tool_choice"}
+        # Keys to exclude from processing (unsupported in Ollama API)
+        exclude_keys = {
+            "instructions",
+            "tool_choice",
+            "allow_multiple_tool_calls",
+            "user",
+            "store",
+            "logit_bias",
+            "metadata",
+        }
 
         # Build run_options and model_options separately
         run_options: dict[str, Any] = {}
diff --git a/python/packages/ollama/tests/test_ollama_chat_client.py b/python/packages/ollama/tests/test_ollama_chat_client.py
index 70f578cc37a..0eeec19c9b0 100644
--- a/python/packages/ollama/tests/test_ollama_chat_client.py
+++ b/python/packages/ollama/tests/test_ollama_chat_client.py
@@ -810,3 +810,52 @@ def test_format_tool_message_strips_unique_suffix(self) -> None:
         assert formatted[0].tool_name == "search:advanced", (
             f"Expected bare name 'search:advanced', got '{formatted[0].tool_name}'"
         )
+
+
+def test_prepare_options_excludes_unsupported_chat_options() -> None:
+    """Verify that unsupported ChatOptions fields are excluded from Ollama run_options even when non-None."""
+    client = OllamaChatClient(host="http://localhost:12345", model="test-model")
+    messages = [Message(role="user", contents=["hello"])]
+    options = {
+        "allow_multiple_tool_calls": False,
+        "user": "test-user-id",
+        "store": True,
+        "logit_bias": {"101": 1.5},
+        "metadata": {"session": "123"},
+        "tool_choice": "auto",
+        "instructions": "Be helpful.",
+    }
+
+    prepared = client._prepare_options(messages, options)
+
+    for unsupported_key in [
+        "allow_multiple_tool_calls",
+        "user",
+        "store",
+        "logit_bias",
+        "metadata",
+        "tool_choice",
+        "instructions",
+    ]:
+        assert unsupported_key not in prepared, f"Key {unsupported_key} should be excluded from run_options"
+
+
+@pytest.mark.asyncio
+async def test_get_response_with_unsupported_options(mock_chat_completion_response: OllamaChatResponse) -> None:
+    """Verify that get_response succeeds when options include unsupported fields."""
+    mock_client = MagicMock(spec=AsyncClient)
+    mock_client._client = MagicMock()
+    mock_client._client.base_url = "http://localhost:12345"
+    mock_client.chat = AsyncMock(return_value=mock_chat_completion_response)
+
+    client = OllamaChatClient(client=mock_client, model="test-model")
+    messages = [Message(role="user", contents=["hello"])]
+    options = {"allow_multiple_tool_calls": False, "user": "test-user"}
+
+    res = await client.get_response(messages=messages, options=options)
+    assert res is not None
+
+    mock_client.chat.assert_called_once()
+    _, kwargs = mock_client.chat.call_args
+    assert "allow_multiple_tool_calls" not in kwargs
+    assert "user" not in kwargs