diff --git a/strands-py/src/strands/injection/__init__.py b/strands-py/src/strands/injection/__init__.py
index e88e4a7dd..d0d58a16d 100644
--- a/strands-py/src/strands/injection/__init__.py
+++ b/strands-py/src/strands/injection/__init__.py
@@ -2,7 +2,7 @@
 
 This package provides the configuration types for context injection — folding just-in-time text
 into the model input before a call without touching durable history. The delivery primitives
-(in ``message_injection``) are internal; reach injection through the ``ContextInjector`` plugin
+(in ``_message_injection``) are internal; reach injection through the ``ContextInjector`` plugin
 or the ``MemoryManager`` rather than using them directly.
 """
 
diff --git a/strands-py/src/strands/injection/message_injection.py b/strands-py/src/strands/injection/_message_injection.py
similarity index 100%
rename from strands-py/src/strands/injection/message_injection.py
rename to strands-py/src/strands/injection/_message_injection.py
diff --git a/strands-py/src/strands/injection/xml.py b/strands-py/src/strands/injection/_xml.py
similarity index 100%
rename from strands-py/src/strands/injection/xml.py
rename to strands-py/src/strands/injection/_xml.py
diff --git a/strands-py/src/strands/memory/extraction/resolve_extraction_config.py b/strands-py/src/strands/memory/extraction/resolve_extraction_config.py
index 120c38ff4..77dd8f200 100644
--- a/strands-py/src/strands/memory/extraction/resolve_extraction_config.py
+++ b/strands-py/src/strands/memory/extraction/resolve_extraction_config.py
@@ -22,7 +22,7 @@
 )
 
 # Default cadence when an ``ExtractionConfig`` omits its ``trigger``: extract every N turns.
-DEFAULT_EXTRACTION_TRIGGER_TURNS = 5
+_DEFAULT_EXTRACTION_TRIGGER_TURNS = 5
 
 
 @dataclass
@@ -57,7 +57,7 @@ def _resolve_extraction_config(
     ``False``/``None`` is off (returns ``None``), ``True`` enables all defaults, an
     :class:`ExtractionConfig` defaults its unset fields. The defaults are:
 
-    - **triggers**: every :data:`DEFAULT_EXTRACTION_TRIGGER_TURNS` turns. An
+    - **triggers**: every :data:`_DEFAULT_EXTRACTION_TRIGGER_TURNS` turns. An
       explicit empty list is left empty for the ``MemoryManager`` to reject.
     - **extractor**: chosen from the methods the store implements. A store that
       implements only ``add`` cannot extract server-side, so it defaults to a
@@ -82,7 +82,7 @@ def _resolve_extraction_config(
 
     triggers: list[ExtractionTrigger]
     if config.trigger is None:
-        triggers = [IntervalTrigger(turns=DEFAULT_EXTRACTION_TRIGGER_TURNS)]
+        triggers = [IntervalTrigger(turns=_DEFAULT_EXTRACTION_TRIGGER_TURNS)]
     elif isinstance(config.trigger, list):
         triggers = config.trigger
     else:
diff --git a/strands-py/src/strands/memory/memory_manager.py b/strands-py/src/strands/memory/memory_manager.py
index 29f1315ee..e938070d8 100644
--- a/strands-py/src/strands/memory/memory_manager.py
+++ b/strands-py/src/strands/memory/memory_manager.py
@@ -9,8 +9,8 @@
 
 from .._middleware.stages import InvokeModelStage
 from ..hooks.events import MessageAddedEvent
-from ..injection.message_injection import _create_injection_middleware, _is_user_turn
-from ..injection.xml import _escape_xml_attr, _escape_xml_text
+from ..injection._message_injection import _create_injection_middleware, _is_user_turn
+from ..injection._xml import _escape_xml_attr, _escape_xml_text
 from ..plugins.plugin import Plugin
 from ..tools.decorator import tool
 from ..types.exceptions import AggregateMemoryError
diff --git a/strands-py/src/strands/vended_plugins/context_injector/plugin.py b/strands-py/src/strands/vended_plugins/context_injector/plugin.py
index 1d672d3a8..132e23a2e 100644
--- a/strands-py/src/strands/vended_plugins/context_injector/plugin.py
+++ b/strands-py/src/strands/vended_plugins/context_injector/plugin.py
@@ -23,7 +23,7 @@
 from typing import TYPE_CHECKING
 
 from ..._middleware.stages import InvokeModelStage
-from ...injection.message_injection import RenderContent, _create_injection_middleware
+from ...injection._message_injection import RenderContent, _create_injection_middleware
 from ...injection.types import InjectionTriggerPredicate
 from ...plugins import Plugin
 
diff --git a/strands-py/tests/strands/injection/test_message_injection.py b/strands-py/tests/strands/injection/test_message_injection.py
index 1ac5741be..4a1314474 100644
--- a/strands-py/tests/strands/injection/test_message_injection.py
+++ b/strands-py/tests/strands/injection/test_message_injection.py
@@ -6,7 +6,7 @@
 import pytest
 
 from strands._middleware.stages import InvokeModelContext
-from strands.injection.message_injection import (
+from strands.injection._message_injection import (
     _create_injection_middleware,
     _fold_into_last_user_message,
     _is_user_turn,
diff --git a/strands-py/tests/strands/memory/test_resolve_extraction_config.py b/strands-py/tests/strands/memory/test_resolve_extraction_config.py
index 3b8bec2ed..3722bf069 100644
--- a/strands-py/tests/strands/memory/test_resolve_extraction_config.py
+++ b/strands-py/tests/strands/memory/test_resolve_extraction_config.py
@@ -12,7 +12,7 @@
 
 from strands.memory.extraction.model_extractor import ModelExtractor
 from strands.memory.extraction.resolve_extraction_config import (
-    DEFAULT_EXTRACTION_TRIGGER_TURNS,
+    _DEFAULT_EXTRACTION_TRIGGER_TURNS,
     _resolve_extraction_config,
 )
 from strands.memory.extraction.triggers import IntervalTrigger, InvocationTrigger
@@ -78,8 +78,8 @@ def test_defaults_an_omitted_trigger_to_interval_of_default_turns():
     assert len(resolved_config.triggers) == 1
     trigger = resolved_config.triggers[0]
     assert isinstance(trigger, IntervalTrigger)
-    assert trigger._turns == DEFAULT_EXTRACTION_TRIGGER_TURNS
-    assert DEFAULT_EXTRACTION_TRIGGER_TURNS == 5
+    assert trigger._turns == _DEFAULT_EXTRACTION_TRIGGER_TURNS
+    assert _DEFAULT_EXTRACTION_TRIGGER_TURNS == 5
 
 
 def test_wraps_a_single_trigger_into_a_list():