diff --git a/docs/docs/reference/constants.md b/docs/docs/reference/constants.md
index f23e941fa..fe26ce727 100644
--- a/docs/docs/reference/constants.md
+++ b/docs/docs/reference/constants.md
@@ -2,5 +2,6 @@
     options:
       members:
         - TAG_HIDDEN
+        - TAG_NOSTREAM
         - START
-        - END
\ No newline at end of file
+        - END
diff --git a/libs/langgraph/langgraph/_internal/_config.py b/libs/langgraph/langgraph/_internal/_config.py
index 1c1428bb0..0b4739c98 100644
--- a/libs/langgraph/langgraph/_internal/_config.py
+++ b/libs/langgraph/langgraph/_internal/_config.py
@@ -18,8 +18,7 @@ from langchain_core.runnables.config import (
     var_child_runnable_config,
 )
 
-from langgraph.checkpoint.base import CheckpointMetadata
-from langgraph.constants import (
+from langgraph._internal._constants import (
     CONF,
     CONFIG_KEY_CHECKPOINT_ID,
     CONFIG_KEY_CHECKPOINT_MAP,
@@ -27,6 +26,7 @@ from langgraph.constants import (
     NS_END,
     NS_SEP,
 )
+from langgraph.checkpoint.base import CheckpointMetadata
 
 DEFAULT_RECURSION_LIMIT = int(getenv("LANGGRAPH_DEFAULT_RECURSION_LIMIT", "25"))
 
diff --git a/libs/langgraph/langgraph/_internal/_constants.py b/libs/langgraph/langgraph/_internal/_constants.py
new file mode 100644
index 000000000..82b44bc15
--- /dev/null
+++ b/libs/langgraph/langgraph/_internal/_constants.py
@@ -0,0 +1,110 @@
+"""Constants used for Pregel operations."""
+
+import sys
+from typing import Literal, cast
+
+# --- Reserved write keys ---
+INPUT = sys.intern("__input__")
+# for values passed as input to the graph
+INTERRUPT = sys.intern("__interrupt__")
+# for dynamic interrupts raised by nodes
+RESUME = sys.intern("__resume__")
+# for values passed to resume a node after an interrupt
+ERROR = sys.intern("__error__")
+# for errors raised by nodes
+NO_WRITES = sys.intern("__no_writes__")
+# marker to signal node didn't write anything
+TASKS = sys.intern("__pregel_tasks")
+# for Send objects returned by nodes/edges, corresponds to PUSH below
+RETURN = sys.intern("__return__")
+# for writes of a task where we simply record the return value
+PREVIOUS = sys.intern("__previous__")
+# the implicit branch that handles each node's Control values
+
+
+# --- Reserved cache namespaces ---
+CACHE_NS_WRITES = sys.intern("__pregel_ns_writes")
+# cache namespace for node writes
+
+# --- Reserved config.configurable keys ---
+CONFIG_KEY_SEND = sys.intern("__pregel_send")
+# holds the `write` function that accepts writes to state/edges/reserved keys
+CONFIG_KEY_READ = sys.intern("__pregel_read")
+# holds the `read` function that returns a copy of the current state
+CONFIG_KEY_CALL = sys.intern("__pregel_call")
+# holds the `call` function that accepts a node/func, args and returns a future
+CONFIG_KEY_CHECKPOINTER = sys.intern("__pregel_checkpointer")
+# holds a `BaseCheckpointSaver` passed from parent graph to child graphs
+CONFIG_KEY_STREAM = sys.intern("__pregel_stream")
+# holds a `StreamProtocol` passed from parent graph to child graphs
+CONFIG_KEY_CACHE = sys.intern("__pregel_cache")
+# holds a `BaseCache` made available to subgraphs
+CONFIG_KEY_RESUMING = sys.intern("__pregel_resuming")
+# holds a boolean indicating if subgraphs should resume from a previous checkpoint
+CONFIG_KEY_TASK_ID = sys.intern("__pregel_task_id")
+# holds the task ID for the current task
+CONFIG_KEY_THREAD_ID = sys.intern("thread_id")
+# holds the thread ID for the current invocation
+CONFIG_KEY_CHECKPOINT_MAP = sys.intern("checkpoint_map")
+# holds a mapping of checkpoint_ns -> checkpoint_id for parent graphs
+CONFIG_KEY_CHECKPOINT_ID = sys.intern("checkpoint_id")
+# holds the current checkpoint_id, if any
+CONFIG_KEY_CHECKPOINT_NS = sys.intern("checkpoint_ns")
+# holds the current checkpoint_ns, "" for root graph
+CONFIG_KEY_NODE_FINISHED = sys.intern("__pregel_node_finished")
+# holds a callback to be called when a node is finished
+CONFIG_KEY_SCRATCHPAD = sys.intern("__pregel_scratchpad")
+# holds a mutable dict for temporary storage scoped to the current task
+CONFIG_KEY_RUNNER_SUBMIT = sys.intern("__pregel_runner_submit")
+# holds a function that receives tasks from runner, executes them and returns results
+CONFIG_KEY_CHECKPOINT_DURING = sys.intern("__pregel_checkpoint_during")
+# holds a boolean indicating whether to checkpoint during the run (or only at the end)
+CONFIG_KEY_RUNTIME = sys.intern("__pregel_runtime")
+# holds a `Runtime` instance with context, store, stream writer, etc.
+CONFIG_KEY_RESUME_MAP = sys.intern("__pregel_resume_map")
+# holds a mapping of task ns -> resume value for resuming tasks
+
+# --- Other constants ---
+PUSH = sys.intern("__pregel_push")
+# denotes push-style tasks, ie. those created by Send objects
+PULL = sys.intern("__pregel_pull")
+# denotes pull-style tasks, ie. those triggered by edges
+NS_SEP = sys.intern("|")
+# for checkpoint_ns, separates each level (ie. graph|subgraph|subsubgraph)
+NS_END = sys.intern(":")
+# for checkpoint_ns, for each level, separates the namespace from the task_id
+CONF = cast(Literal["configurable"], sys.intern("configurable"))
+# key for the configurable dict in RunnableConfig
+NULL_TASK_ID = sys.intern("00000000-0000-0000-0000-000000000000")
+# the task_id to use for writes that are not associated with a task
+
+# redefined to avoid circular import with langgraph.constants
+_TAG_HIDDEN = sys.intern("langsmith:hidden")
+
+RESERVED = {
+    _TAG_HIDDEN,
+    # reserved write keys
+    INPUT,
+    INTERRUPT,
+    RESUME,
+    ERROR,
+    NO_WRITES,
+    # reserved config.configurable keys
+    CONFIG_KEY_SEND,
+    CONFIG_KEY_READ,
+    CONFIG_KEY_CHECKPOINTER,
+    CONFIG_KEY_STREAM,
+    CONFIG_KEY_CHECKPOINT_MAP,
+    CONFIG_KEY_RESUMING,
+    CONFIG_KEY_TASK_ID,
+    CONFIG_KEY_CHECKPOINT_MAP,
+    CONFIG_KEY_CHECKPOINT_ID,
+    CONFIG_KEY_CHECKPOINT_NS,
+    CONFIG_KEY_RESUME_MAP,
+    # other constants
+    PUSH,
+    PULL,
+    NS_SEP,
+    NS_END,
+    CONF,
+}
diff --git a/libs/langgraph/langgraph/_internal/_runnable.py b/libs/langgraph/langgraph/_internal/_runnable.py
index 22d1b0515..efa0dc825 100644
--- a/libs/langgraph/langgraph/_internal/_runnable.py
+++ b/libs/langgraph/langgraph/_internal/_runnable.py
@@ -48,11 +48,11 @@ from langgraph._internal._config import (
     get_callback_manager_for_config,
     patch_config,
 )
-from langgraph._internal._typing import MISSING
-from langgraph.constants import (
+from langgraph._internal._constants import (
     CONF,
     CONFIG_KEY_RUNTIME,
 )
+from langgraph._internal._typing import MISSING
 from langgraph.store.base import BaseStore
 from langgraph.types import StreamWriter
 
diff --git a/libs/langgraph/langgraph/config.py b/libs/langgraph/langgraph/config.py
index d5f9db8fb..660924e46 100644
--- a/libs/langgraph/langgraph/config.py
+++ b/libs/langgraph/langgraph/config.py
@@ -5,7 +5,7 @@ from typing import Any
 from langchain_core.runnables import RunnableConfig
 from langchain_core.runnables.config import var_child_runnable_config
 
-from langgraph.constants import CONF, CONFIG_KEY_RUNTIME
+from langgraph._internal._constants import CONF, CONFIG_KEY_RUNTIME
 from langgraph.store.base import BaseStore
 from langgraph.types import StreamWriter
 
diff --git a/libs/langgraph/langgraph/constants.py b/libs/langgraph/langgraph/constants.py
index 726f15e45..5b7e52aae 100644
--- a/libs/langgraph/langgraph/constants.py
+++ b/libs/langgraph/langgraph/constants.py
@@ -1,7 +1,12 @@
 import sys
-from typing import Any, Literal, cast
+from typing import Any
 from warnings import warn
 
+from langgraph._internal._constants import (
+    CONF,
+    CONFIG_KEY_CHECKPOINTER,
+    TASKS,
+)
 from langgraph.warnings import LangGraphDeprecatedSinceV10
 
 __all__ = (
@@ -9,10 +14,22 @@ __all__ = (
     "TAG_HIDDEN",
     "START",
     "END",
-    "SELF",
-    "PREVIOUS",
+    # retained for backwards compatibility (mostly langgraph-api), should be removed in v2 (or earlier)
+    "CONF",
+    "TASKS",
+    "CONFIG_KEY_CHECKPOINTER",
 )
 
+# --- Public constants ---
+TAG_NOSTREAM = sys.intern("nostream")
+"""Tag to disable streaming for a chat model."""
+TAG_HIDDEN = sys.intern("langsmith:hidden")
+"""Tag to hide a node/edge from certain tracing/streaming environments."""
+END = sys.intern("__end__")
+"""The last (maybe virtual) node in graph-style Pregel."""
+START = sys.intern("__start__")
+"""The first (maybe virtual) node in graph-style Pregel."""
+
 
 def __getattr__(name: str) -> Any:
     if name in ["Send", "Interrupt"]:
@@ -28,117 +45,20 @@ def __getattr__(name: str) -> Any:
         module = import_module("langgraph.types")
         return getattr(module, name)
 
+    try:
+        from importlib import import_module
+
+        private_constants = import_module("langgraph._internal._constants")
+        attr = getattr(private_constants, name)
+        warn(
+            f"Importing {name} from langgraph.constants is deprecated. "
+            f"This constant is now private and should not be used directly. "
+            "Please let the LangGraph team know if you need this value.",
+            LangGraphDeprecatedSinceV10,
+            stacklevel=2,
+        )
+        return attr
+    except AttributeError:
+        pass
+
     raise AttributeError(f"module has no attribute '{name}'")
-
-
-# --- Public constants ---
-TAG_NOSTREAM = sys.intern("nostream")
-"""Tag to disable streaming for a chat model."""
-TAG_HIDDEN = sys.intern("langsmith:hidden")
-"""Tag to hide a node/edge from certain tracing/streaming environments."""
-START = sys.intern("__start__")
-"""The first (maybe virtual) node in graph-style Pregel."""
-END = sys.intern("__end__")
-"""The last (maybe virtual) node in graph-style Pregel."""
-SELF = sys.intern("__self__")
-"""The implicit branch that handles each node's Control values."""
-PREVIOUS = sys.intern("__previous__")
-
-# --- Reserved write keys ---
-INPUT = sys.intern("__input__")
-# for values passed as input to the graph
-INTERRUPT = sys.intern("__interrupt__")
-# for dynamic interrupts raised by nodes
-RESUME = sys.intern("__resume__")
-# for values passed to resume a node after an interrupt
-ERROR = sys.intern("__error__")
-# for errors raised by nodes
-NO_WRITES = sys.intern("__no_writes__")
-# marker to signal node didn't write anything
-TASKS = sys.intern("__pregel_tasks")
-# for Send objects returned by nodes/edges, corresponds to PUSH below
-RETURN = sys.intern("__return__")
-# for writes of a task where we simply record the return value
-
-# --- Reserved cache namespaces ---
-CACHE_NS_WRITES = sys.intern("__pregel_ns_writes")
-# cache namespace for node writes
-
-# --- Reserved config.configurable keys ---
-CONFIG_KEY_SEND = sys.intern("__pregel_send")
-# holds the `write` function that accepts writes to state/edges/reserved keys
-CONFIG_KEY_READ = sys.intern("__pregel_read")
-# holds the `read` function that returns a copy of the current state
-CONFIG_KEY_CALL = sys.intern("__pregel_call")
-# holds the `call` function that accepts a node/func, args and returns a future
-CONFIG_KEY_CHECKPOINTER = sys.intern("__pregel_checkpointer")
-# holds a `BaseCheckpointSaver` passed from parent graph to child graphs
-CONFIG_KEY_STREAM = sys.intern("__pregel_stream")
-# holds a `StreamProtocol` passed from parent graph to child graphs
-CONFIG_KEY_CACHE = sys.intern("__pregel_cache")
-# holds a `BaseCache` made available to subgraphs
-CONFIG_KEY_RESUMING = sys.intern("__pregel_resuming")
-# holds a boolean indicating if subgraphs should resume from a previous checkpoint
-CONFIG_KEY_TASK_ID = sys.intern("__pregel_task_id")
-# holds the task ID for the current task
-CONFIG_KEY_THREAD_ID = sys.intern("thread_id")
-# holds the thread ID for the current invocation
-CONFIG_KEY_CHECKPOINT_MAP = sys.intern("checkpoint_map")
-# holds a mapping of checkpoint_ns -> checkpoint_id for parent graphs
-CONFIG_KEY_CHECKPOINT_ID = sys.intern("checkpoint_id")
-# holds the current checkpoint_id, if any
-CONFIG_KEY_CHECKPOINT_NS = sys.intern("checkpoint_ns")
-# holds the current checkpoint_ns, "" for root graph
-CONFIG_KEY_NODE_FINISHED = sys.intern("__pregel_node_finished")
-# holds a callback to be called when a node is finished
-CONFIG_KEY_SCRATCHPAD = sys.intern("__pregel_scratchpad")
-# holds a mutable dict for temporary storage scoped to the current task
-CONFIG_KEY_RUNNER_SUBMIT = sys.intern("__pregel_runner_submit")
-# holds a function that receives tasks from runner, executes them and returns results
-CONFIG_KEY_CHECKPOINT_DURING = sys.intern("__pregel_checkpoint_during")
-# holds a boolean indicating whether to checkpoint during the run (or only at the end)
-CONFIG_KEY_RUNTIME = sys.intern("__pregel_runtime")
-# holds a `Runtime` instance with context, store, stream writer, etc.
-
-# --- Other constants ---
-PUSH = sys.intern("__pregel_push")
-# denotes push-style tasks, ie. those created by Send objects
-PULL = sys.intern("__pregel_pull")
-# denotes pull-style tasks, ie. those triggered by edges
-NS_SEP = sys.intern("|")
-# for checkpoint_ns, separates each level (ie. graph|subgraph|subsubgraph)
-NS_END = sys.intern(":")
-# for checkpoint_ns, for each level, separates the namespace from the task_id
-CONF = cast(Literal["configurable"], sys.intern("configurable"))
-# key for the configurable dict in RunnableConfig
-NULL_TASK_ID = sys.intern("00000000-0000-0000-0000-000000000000")
-# the task_id to use for writes that are not associated with a task
-CONFIG_KEY_RESUME_MAP = sys.intern("__pregel_resume_map")
-# holds a mapping of task ns -> resume value for resuming tasks
-
-RESERVED = {
-    TAG_HIDDEN,
-    # reserved write keys
-    INPUT,
-    INTERRUPT,
-    RESUME,
-    ERROR,
-    NO_WRITES,
-    # reserved config.configurable keys
-    CONFIG_KEY_SEND,
-    CONFIG_KEY_READ,
-    CONFIG_KEY_CHECKPOINTER,
-    CONFIG_KEY_STREAM,
-    CONFIG_KEY_CHECKPOINT_MAP,
-    CONFIG_KEY_RESUMING,
-    CONFIG_KEY_TASK_ID,
-    CONFIG_KEY_CHECKPOINT_MAP,
-    CONFIG_KEY_CHECKPOINT_ID,
-    CONFIG_KEY_CHECKPOINT_NS,
-    # other constants
-    PUSH,
-    PULL,
-    NS_SEP,
-    NS_END,
-    CONF,
-}
diff --git a/libs/langgraph/langgraph/func/__init__.py b/libs/langgraph/langgraph/func/__init__.py
index d1e6d07bf..d62995ab5 100644
--- a/libs/langgraph/langgraph/func/__init__.py
+++ b/libs/langgraph/langgraph/func/__init__.py
@@ -20,12 +20,13 @@ from typing import (
 
 from typing_extensions import Unpack
 
+from langgraph._internal._constants import CACHE_NS_WRITES, PREVIOUS
 from langgraph._internal._typing import MISSING, DeprecatedKwargs
 from langgraph.cache.base import BaseCache
 from langgraph.channels.ephemeral_value import EphemeralValue
 from langgraph.channels.last_value import LastValue
 from langgraph.checkpoint.base import BaseCheckpointSaver
-from langgraph.constants import CACHE_NS_WRITES, END, PREVIOUS, START
+from langgraph.constants import END, START
 from langgraph.pregel import Pregel
 from langgraph.pregel._call import (
     P,
diff --git a/libs/langgraph/langgraph/graph/message.py b/libs/langgraph/langgraph/graph/message.py
index fc3355eb6..e20c22185 100644
--- a/libs/langgraph/langgraph/graph/message.py
+++ b/libs/langgraph/langgraph/graph/message.py
@@ -24,7 +24,7 @@ from langchain_core.messages import (
 )
 from typing_extensions import TypedDict
 
-from langgraph.constants import CONF, CONFIG_KEY_SEND
+from langgraph._internal._constants import CONF, CONFIG_KEY_SEND, NS_SEP
 from langgraph.graph.state import StateGraph
 
 __all__ = (
@@ -320,7 +320,6 @@ def push_message(
     )
 
     from langgraph.config import get_config
-    from langgraph.constants import NS_SEP
     from langgraph.pregel._messages import StreamMessagesHandler
 
     config = get_config()
diff --git a/libs/langgraph/langgraph/graph/state.py b/libs/langgraph/langgraph/graph/state.py
index a4654a8c2..40be8a8ee 100644
--- a/libs/langgraph/langgraph/graph/state.py
+++ b/libs/langgraph/langgraph/graph/state.py
@@ -27,6 +27,12 @@ from langchain_core.runnables import Runnable, RunnableConfig
 from pydantic import BaseModel, TypeAdapter
 from typing_extensions import Self, Unpack, is_typeddict
 
+from langgraph._internal._constants import (
+    INTERRUPT,
+    NS_END,
+    NS_SEP,
+    TASKS,
+)
 from langgraph._internal._fields import (
     get_cached_annotated_keys,
     get_field_default,
@@ -45,15 +51,7 @@ from langgraph.channels.named_barrier_value import (
     NamedBarrierValueAfterFinish,
 )
 from langgraph.checkpoint.base import Checkpoint
-from langgraph.constants import (
-    END,
-    INTERRUPT,
-    NS_END,
-    NS_SEP,
-    START,
-    TAG_HIDDEN,
-    TASKS,
-)
+from langgraph.constants import END, START, TAG_HIDDEN
 from langgraph.errors import (
     ErrorCode,
     InvalidUpdateError,
diff --git a/libs/langgraph/langgraph/graph/ui.py b/libs/langgraph/langgraph/graph/ui.py
index e829eff2e..f2fe5a1c2 100644
--- a/libs/langgraph/langgraph/graph/ui.py
+++ b/libs/langgraph/langgraph/graph/ui.py
@@ -7,7 +7,7 @@ from langchain_core.messages import AnyMessage
 from typing_extensions import TypedDict
 
 from langgraph.config import get_config, get_stream_writer
-from langgraph.constants import CONF, CONFIG_KEY_SEND
+from langgraph.constants import CONF
 
 __all__ = (
     "UIMessage",
@@ -96,6 +96,8 @@ def push_ui_message(
         )
 
     """
+    from langgraph._internal._constants import CONFIG_KEY_SEND
+
     writer = get_stream_writer()
     config = get_config()
 
@@ -148,6 +150,8 @@ def delete_ui_message(id: str, *, state_key: str = "ui") -> RemoveUIMessage:
         delete_ui_message("message-123")
 
     """
+    from langgraph._internal._constants import CONFIG_KEY_SEND
+
     writer = get_stream_writer()
     config = get_config()
 
diff --git a/libs/langgraph/langgraph/pregel/_algo.py b/libs/langgraph/langgraph/pregel/_algo.py
index c813a6805..adb8cdb64 100644
--- a/libs/langgraph/langgraph/pregel/_algo.py
+++ b/libs/langgraph/langgraph/pregel/_algo.py
@@ -26,18 +26,7 @@ from langchain_core.runnables.config import RunnableConfig
 from xxhash import xxh3_128_hexdigest
 
 from langgraph._internal._config import merge_configs, patch_config
-from langgraph._internal._runtime import patch_runtime_non_null
-from langgraph._internal._typing import EMPTY_SEQ, MISSING
-from langgraph.channels.base import BaseChannel
-from langgraph.channels.topic import Topic
-from langgraph.checkpoint.base import (
-    BaseCheckpointSaver,
-    ChannelVersions,
-    Checkpoint,
-    PendingWrite,
-    V,
-)
-from langgraph.constants import (
+from langgraph._internal._constants import (
     CACHE_NS_WRITES,
     CONF,
     CONFIG_KEY_CHECKPOINT_ID,
@@ -62,9 +51,20 @@ from langgraph.constants import (
     RESERVED,
     RESUME,
     RETURN,
-    TAG_HIDDEN,
     TASKS,
 )
+from langgraph._internal._runtime import patch_runtime_non_null
+from langgraph._internal._typing import EMPTY_SEQ, MISSING
+from langgraph.channels.base import BaseChannel
+from langgraph.channels.topic import Topic
+from langgraph.checkpoint.base import (
+    BaseCheckpointSaver,
+    ChannelVersions,
+    Checkpoint,
+    PendingWrite,
+    V,
+)
+from langgraph.constants import TAG_HIDDEN
 from langgraph.managed.base import ManagedValueMapping
 from langgraph.pregel._call import get_runnable_for_task, identifier
 from langgraph.pregel._io import read_channels
diff --git a/libs/langgraph/langgraph/pregel/_call.py b/libs/langgraph/langgraph/pregel/_call.py
index 6bcd93f05..5956160aa 100644
--- a/libs/langgraph/langgraph/pregel/_call.py
+++ b/libs/langgraph/langgraph/pregel/_call.py
@@ -13,6 +13,7 @@ from typing import Any, Callable, Generic, TypeVar, cast
 from langchain_core.runnables import Runnable
 from typing_extensions import ParamSpec
 
+from langgraph._internal._constants import CONF, CONFIG_KEY_CALL, RETURN
 from langgraph._internal._runnable import (
     RunnableCallable,
     RunnableSeq,
@@ -20,7 +21,6 @@ from langgraph._internal._runnable import (
     run_in_executor,
 )
 from langgraph.config import get_config
-from langgraph.constants import CONF, CONFIG_KEY_CALL, RETURN
 from langgraph.pregel._write import ChannelWrite, ChannelWriteEntry
 from langgraph.types import CachePolicy, RetryPolicy
 
diff --git a/libs/langgraph/langgraph/pregel/_config.py b/libs/langgraph/langgraph/pregel/_config.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/libs/langgraph/langgraph/pregel/_draw.py b/libs/langgraph/langgraph/pregel/_draw.py
index 9720f10e7..b8ae73389 100644
--- a/libs/langgraph/langgraph/pregel/_draw.py
+++ b/libs/langgraph/langgraph/pregel/_draw.py
@@ -7,9 +7,10 @@ from typing import Any, cast
 from langchain_core.runnables.config import RunnableConfig
 from langchain_core.runnables.graph import Graph, Node
 
+from langgraph._internal._constants import CONF, CONFIG_KEY_SEND, INPUT
 from langgraph.channels.base import BaseChannel
 from langgraph.checkpoint.base import BaseCheckpointSaver
-from langgraph.constants import CONF, CONFIG_KEY_SEND, END, INPUT, START
+from langgraph.constants import END, START
 from langgraph.managed.base import ManagedValueSpec
 from langgraph.pregel._algo import (
     PregelTaskWrites,
diff --git a/libs/langgraph/langgraph/pregel/_io.py b/libs/langgraph/langgraph/pregel/_io.py
index a5af16c23..3c05dbda7 100644
--- a/libs/langgraph/langgraph/pregel/_io.py
+++ b/libs/langgraph/langgraph/pregel/_io.py
@@ -4,18 +4,17 @@ from collections import Counter
 from collections.abc import Iterator, Mapping, Sequence
 from typing import Any, Literal
 
-from langgraph._internal._typing import EMPTY_SEQ, MISSING
-from langgraph.channels.base import BaseChannel, EmptyChannelError
-from langgraph.constants import (
+from langgraph._internal._constants import (
     ERROR,
     INTERRUPT,
     NULL_TASK_ID,
     RESUME,
     RETURN,
-    START,
-    TAG_HIDDEN,
     TASKS,
 )
+from langgraph._internal._typing import EMPTY_SEQ, MISSING
+from langgraph.channels.base import BaseChannel, EmptyChannelError
+from langgraph.constants import START, TAG_HIDDEN
 from langgraph.errors import InvalidUpdateError
 from langgraph.pregel._log import logger
 from langgraph.types import Command, PregelExecutableTask, Send
diff --git a/libs/langgraph/langgraph/pregel/_loop.py b/libs/langgraph/langgraph/pregel/_loop.py
index 7b1663d15..687b1d209 100644
--- a/libs/langgraph/langgraph/pregel/_loop.py
+++ b/libs/langgraph/langgraph/pregel/_loop.py
@@ -28,19 +28,7 @@ from langchain_core.runnables import RunnableConfig
 from typing_extensions import ParamSpec, Self
 
 from langgraph._internal._config import patch_configurable
-from langgraph._internal._typing import EMPTY_SEQ, MISSING
-from langgraph.cache.base import BaseCache
-from langgraph.channels.base import BaseChannel
-from langgraph.checkpoint.base import (
-    WRITES_IDX_MAP,
-    BaseCheckpointSaver,
-    ChannelVersions,
-    Checkpoint,
-    CheckpointMetadata,
-    CheckpointTuple,
-    PendingWrite,
-)
-from langgraph.constants import (
+from langgraph._internal._constants import (
     CONF,
     CONFIG_KEY_CHECKPOINT_ID,
     CONFIG_KEY_CHECKPOINT_MAP,
@@ -59,8 +47,20 @@ from langgraph.constants import (
     NULL_TASK_ID,
     PUSH,
     RESUME,
-    TAG_HIDDEN,
 )
+from langgraph._internal._typing import EMPTY_SEQ, MISSING
+from langgraph.cache.base import BaseCache
+from langgraph.channels.base import BaseChannel
+from langgraph.checkpoint.base import (
+    WRITES_IDX_MAP,
+    BaseCheckpointSaver,
+    ChannelVersions,
+    Checkpoint,
+    CheckpointMetadata,
+    CheckpointTuple,
+    PendingWrite,
+)
+from langgraph.constants import TAG_HIDDEN
 from langgraph.errors import (
     EmptyInputError,
     GraphInterrupt,
diff --git a/libs/langgraph/langgraph/pregel/_messages.py b/libs/langgraph/langgraph/pregel/_messages.py
index b06991ba3..550ea789c 100644
--- a/libs/langgraph/langgraph/pregel/_messages.py
+++ b/libs/langgraph/langgraph/pregel/_messages.py
@@ -13,7 +13,8 @@ from langchain_core.callbacks import BaseCallbackHandler
 from langchain_core.messages import BaseMessage
 from langchain_core.outputs import ChatGeneration, ChatGenerationChunk, LLMResult
 
-from langgraph.constants import NS_SEP, TAG_HIDDEN, TAG_NOSTREAM
+from langgraph._internal._constants import NS_SEP
+from langgraph.constants import TAG_HIDDEN, TAG_NOSTREAM
 from langgraph.pregel.protocol import StreamChunk
 from langgraph.types import Command
 
diff --git a/libs/langgraph/langgraph/pregel/_read.py b/libs/langgraph/langgraph/pregel/_read.py
index a3edf2c31..bb3a6bf12 100644
--- a/libs/langgraph/langgraph/pregel/_read.py
+++ b/libs/langgraph/langgraph/pregel/_read.py
@@ -11,8 +11,8 @@ from typing import (
 from langchain_core.runnables import Runnable, RunnableConfig
 
 from langgraph._internal._config import merge_configs
+from langgraph._internal._constants import CONF, CONFIG_KEY_READ
 from langgraph._internal._runnable import RunnableCallable, RunnableSeq
-from langgraph.constants import CONF, CONFIG_KEY_READ
 from langgraph.pregel._utils import find_subgraph_pregel
 from langgraph.pregel._write import ChannelWrite
 from langgraph.pregel.protocol import PregelProtocol
diff --git a/libs/langgraph/langgraph/pregel/_retry.py b/libs/langgraph/langgraph/pregel/_retry.py
index 4873e6824..d54797108 100644
--- a/libs/langgraph/langgraph/pregel/_retry.py
+++ b/libs/langgraph/langgraph/pregel/_retry.py
@@ -10,7 +10,7 @@ from dataclasses import replace
 from typing import Any, Callable
 
 from langgraph._internal._config import patch_configurable
-from langgraph.constants import (
+from langgraph._internal._constants import (
     CONF,
     CONFIG_KEY_CHECKPOINT_NS,
     CONFIG_KEY_RESUMING,
diff --git a/libs/langgraph/langgraph/pregel/_runner.py b/libs/langgraph/langgraph/pregel/_runner.py
index 835525a76..d38afcfd6 100644
--- a/libs/langgraph/langgraph/pregel/_runner.py
+++ b/libs/langgraph/langgraph/pregel/_runner.py
@@ -19,9 +19,7 @@ from typing import (
 
 from langchain_core.callbacks import Callbacks
 
-from langgraph._internal._future import chain_future, run_coroutine_threadsafe
-from langgraph._internal._typing import MISSING
-from langgraph.constants import (
+from langgraph._internal._constants import (
     CONF,
     CONFIG_KEY_CALL,
     CONFIG_KEY_SCRATCHPAD,
@@ -30,8 +28,10 @@ from langgraph.constants import (
     NO_WRITES,
     RESUME,
     RETURN,
-    TAG_HIDDEN,
 )
+from langgraph._internal._future import chain_future, run_coroutine_threadsafe
+from langgraph._internal._typing import MISSING
+from langgraph.constants import TAG_HIDDEN
 from langgraph.errors import GraphBubbleUp, GraphInterrupt
 from langgraph.pregel._algo import Call
 from langgraph.pregel._executor import Submit
diff --git a/libs/langgraph/langgraph/pregel/_validate.py b/libs/langgraph/langgraph/pregel/_validate.py
index 9a8910703..fcfb54c9a 100644
--- a/libs/langgraph/langgraph/pregel/_validate.py
+++ b/libs/langgraph/langgraph/pregel/_validate.py
@@ -3,8 +3,8 @@ from __future__ import annotations
 from collections.abc import Mapping, Sequence
 from typing import Any
 
+from langgraph._internal._constants import RESERVED
 from langgraph.channels.base import BaseChannel
-from langgraph.constants import RESERVED
 from langgraph.managed.base import ManagedValueMapping
 from langgraph.pregel._read import PregelNode
 from langgraph.types import All
diff --git a/libs/langgraph/langgraph/pregel/_write.py b/libs/langgraph/langgraph/pregel/_write.py
index dcefb2a36..6a6e4b612 100644
--- a/libs/langgraph/langgraph/pregel/_write.py
+++ b/libs/langgraph/langgraph/pregel/_write.py
@@ -13,9 +13,9 @@ from typing import (
 
 from langchain_core.runnables import Runnable, RunnableConfig
 
+from langgraph._internal._constants import CONF, CONFIG_KEY_SEND, TASKS
 from langgraph._internal._runnable import RunnableCallable
 from langgraph._internal._typing import MISSING
-from langgraph.constants import CONF, CONFIG_KEY_SEND, TASKS
 from langgraph.errors import InvalidUpdateError
 from langgraph.types import Send
 
diff --git a/libs/langgraph/langgraph/pregel/debug.py b/libs/langgraph/langgraph/pregel/debug.py
index aeaf99ad7..d6fb1d630 100644
--- a/libs/langgraph/langgraph/pregel/debug.py
+++ b/libs/langgraph/langgraph/pregel/debug.py
@@ -9,10 +9,7 @@ from langchain_core.runnables import RunnableConfig
 from typing_extensions import TypedDict
 
 from langgraph._internal._config import patch_checkpoint_map
-from langgraph._internal._typing import MISSING
-from langgraph.channels.base import BaseChannel
-from langgraph.checkpoint.base import CheckpointMetadata, PendingWrite
-from langgraph.constants import (
+from langgraph._internal._constants import (
     CONF,
     CONFIG_KEY_CHECKPOINT_NS,
     ERROR,
@@ -20,8 +17,11 @@ from langgraph.constants import (
     NS_END,
     NS_SEP,
     RETURN,
-    TAG_HIDDEN,
 )
+from langgraph._internal._typing import MISSING
+from langgraph.channels.base import BaseChannel
+from langgraph.checkpoint.base import CheckpointMetadata, PendingWrite
+from langgraph.constants import TAG_HIDDEN
 from langgraph.pregel._io import read_channels
 from langgraph.types import PregelExecutableTask, PregelTask, StateSnapshot
 
diff --git a/libs/langgraph/langgraph/pregel/main.py b/libs/langgraph/langgraph/pregel/main.py
index 1d7324f65..22a02a88d 100644
--- a/libs/langgraph/langgraph/pregel/main.py
+++ b/libs/langgraph/langgraph/pregel/main.py
@@ -36,6 +36,31 @@ from langgraph._internal._config import (
     patch_configurable,
     recast_checkpoint_ns,
 )
+from langgraph._internal._constants import (
+    CACHE_NS_WRITES,
+    CONF,
+    CONFIG_KEY_CACHE,
+    CONFIG_KEY_CHECKPOINT_DURING,
+    CONFIG_KEY_CHECKPOINT_ID,
+    CONFIG_KEY_CHECKPOINT_NS,
+    CONFIG_KEY_CHECKPOINTER,
+    CONFIG_KEY_NODE_FINISHED,
+    CONFIG_KEY_READ,
+    CONFIG_KEY_RUNNER_SUBMIT,
+    CONFIG_KEY_RUNTIME,
+    CONFIG_KEY_SEND,
+    CONFIG_KEY_STREAM,
+    CONFIG_KEY_TASK_ID,
+    CONFIG_KEY_THREAD_ID,
+    ERROR,
+    INPUT,
+    INTERRUPT,
+    NS_END,
+    NS_SEP,
+    NULL_TASK_ID,
+    PUSH,
+    TASKS,
+)
 from langgraph._internal._pydantic import create_model
 from langgraph._internal._queue import (  # type: ignore[attr-defined]
     AsyncQueue,
@@ -57,32 +82,7 @@ from langgraph.checkpoint.base import (
     CheckpointTuple,
 )
 from langgraph.config import get_config
-from langgraph.constants import (
-    CACHE_NS_WRITES,
-    CONF,
-    CONFIG_KEY_CACHE,
-    CONFIG_KEY_CHECKPOINT_DURING,
-    CONFIG_KEY_CHECKPOINT_ID,
-    CONFIG_KEY_CHECKPOINT_NS,
-    CONFIG_KEY_CHECKPOINTER,
-    CONFIG_KEY_NODE_FINISHED,
-    CONFIG_KEY_READ,
-    CONFIG_KEY_RUNNER_SUBMIT,
-    CONFIG_KEY_RUNTIME,
-    CONFIG_KEY_SEND,
-    CONFIG_KEY_STREAM,
-    CONFIG_KEY_TASK_ID,
-    CONFIG_KEY_THREAD_ID,
-    END,
-    ERROR,
-    INPUT,
-    INTERRUPT,
-    NS_END,
-    NS_SEP,
-    NULL_TASK_ID,
-    PUSH,
-    TASKS,
-)
+from langgraph.constants import END
 from langgraph.errors import (
     ErrorCode,
     GraphRecursionError,
diff --git a/libs/langgraph/langgraph/pregel/remote.py b/libs/langgraph/langgraph/pregel/remote.py
index c5e0e8dcd..837efa364 100644
--- a/libs/langgraph/langgraph/pregel/remote.py
+++ b/libs/langgraph/langgraph/pregel/remote.py
@@ -30,8 +30,7 @@ from langgraph_sdk.schema import StreamMode as StreamModeSDK
 from typing_extensions import Self
 
 from langgraph._internal._config import merge_configs
-from langgraph.checkpoint.base import CheckpointMetadata
-from langgraph.constants import (
+from langgraph._internal._constants import (
     CONF,
     CONFIG_KEY_CHECKPOINT_ID,
     CONFIG_KEY_CHECKPOINT_MAP,
@@ -41,6 +40,7 @@ from langgraph.constants import (
     INTERRUPT,
     NS_SEP,
 )
+from langgraph.checkpoint.base import CheckpointMetadata
 from langgraph.errors import GraphInterrupt
 from langgraph.pregel.protocol import PregelProtocol, StreamProtocol
 from langgraph.types import (
diff --git a/libs/langgraph/langgraph/runtime.py b/libs/langgraph/langgraph/runtime.py
index cfaa8dbe9..e793e007c 100644
--- a/libs/langgraph/langgraph/runtime.py
+++ b/libs/langgraph/langgraph/runtime.py
@@ -3,8 +3,8 @@ from __future__ import annotations
 from dataclasses import dataclass
 from typing import Any, Generic, cast
 
+from langgraph._internal._constants import CONF, CONFIG_KEY_RUNTIME
 from langgraph.config import get_config
-from langgraph.constants import CONF, CONFIG_KEY_RUNTIME
 from langgraph.store.base import BaseStore
 from langgraph.types import _DC_KWARGS, StreamWriter
 from langgraph.typing import ContextT
diff --git a/libs/langgraph/langgraph/types.py b/libs/langgraph/langgraph/types.py
index 95c2d708d..2cb6d58ab 100644
--- a/libs/langgraph/langgraph/types.py
+++ b/libs/langgraph/langgraph/types.py
@@ -473,13 +473,13 @@ def interrupt(value: Any) -> Any:
     Raises:
         GraphInterrupt: On the first invocation within the node, halts execution and surfaces the provided value to the client.
     """
-    from langgraph.config import get_config
-    from langgraph.constants import (
+    from langgraph._internal._constants import (
         CONFIG_KEY_CHECKPOINT_NS,
         CONFIG_KEY_SCRATCHPAD,
         CONFIG_KEY_SEND,
         RESUME,
     )
+    from langgraph.config import get_config
     from langgraph.errors import GraphInterrupt
 
     conf = get_config()["configurable"]
diff --git a/libs/langgraph/tests/test_algo.py b/libs/langgraph/tests/test_algo.py
index f32fa4334..0bf988173 100644
--- a/libs/langgraph/tests/test_algo.py
+++ b/libs/langgraph/tests/test_algo.py
@@ -1,4 +1,4 @@
-from langgraph.constants import PULL, PUSH
+from langgraph._internal._constants import PULL, PUSH
 from langgraph.pregel._algo import prepare_next_tasks, task_path_str
 from langgraph.pregel._checkpoint import channels_from_checkpoint, empty_checkpoint
 
diff --git a/libs/langgraph/tests/test_deprecation.py b/libs/langgraph/tests/test_deprecation.py
index dee208c4b..d33b1a8ac 100644
--- a/libs/langgraph/tests/test_deprecation.py
+++ b/libs/langgraph/tests/test_deprecation.py
@@ -142,6 +142,7 @@ def test_config_type_deprecation_pregel(mocker: MockerFixture) -> None:
         )
 
 
+@pytest.mark.filterwarnings("ignore:`interrupt_id` is deprecated. Use `id` instead.")
 def test_interrupt_attributes_deprecation() -> None:
     interrupt = Interrupt(value="question", id="abc")
 
@@ -152,9 +153,18 @@ def test_interrupt_attributes_deprecation() -> None:
         interrupt.interrupt_id
 
 
+@pytest.mark.filterwarnings("ignore:NodeInterrupt is deprecated.")
 def test_node_interrupt_deprecation() -> None:
     with pytest.warns(
         LangGraphDeprecatedSinceV10,
         match="NodeInterrupt is deprecated. Please use `langgraph.types.interrupt` instead.",
     ):
         NodeInterrupt(value="test")
+
+
+def test_deprecated_import() -> None:
+    with pytest.warns(
+        LangGraphDeprecatedSinceV10,
+        match="Importing PREVIOUS from langgraph.constants is deprecated. This constant is now private and should not be used directly.",
+    ):
+        from langgraph.constants import PREVIOUS  # noqa: F401
diff --git a/libs/langgraph/tests/test_large_cases.py b/libs/langgraph/tests/test_large_cases.py
index 419686255..463c4542f 100644
--- a/libs/langgraph/tests/test_large_cases.py
+++ b/libs/langgraph/tests/test_large_cases.py
@@ -11,11 +11,12 @@ from pytest_mock import MockerFixture
 from syrupy import SnapshotAssertion
 from typing_extensions import TypedDict
 
+from langgraph._internal._constants import PULL, PUSH
 from langgraph.channels.last_value import LastValue
 from langgraph.channels.untracked_value import UntrackedValue
 from langgraph.checkpoint.base import BaseCheckpointSaver
 from langgraph.checkpoint.memory import InMemorySaver
-from langgraph.constants import END, PULL, PUSH, START
+from langgraph.constants import END, START
 from langgraph.graph import StateGraph
 from langgraph.graph.message import MessageGraph, MessagesState, add_messages
 from langgraph.prebuilt.chat_agent_executor import create_react_agent
diff --git a/libs/langgraph/tests/test_large_cases_async.py b/libs/langgraph/tests/test_large_cases_async.py
index 29f92d8b9..8be3e84c6 100644
--- a/libs/langgraph/tests/test_large_cases_async.py
+++ b/libs/langgraph/tests/test_large_cases_async.py
@@ -16,10 +16,11 @@ from langchain_core.runnables import RunnableConfig, RunnablePick
 from pytest_mock import MockerFixture
 from typing_extensions import TypedDict
 
+from langgraph._internal._constants import PULL, PUSH
 from langgraph.channels.last_value import LastValue
 from langgraph.channels.untracked_value import UntrackedValue
 from langgraph.checkpoint.base import BaseCheckpointSaver
-from langgraph.constants import END, PULL, PUSH, START
+from langgraph.constants import END, START
 from langgraph.graph.message import MessageGraph, add_messages
 from langgraph.graph.state import StateGraph
 from langgraph.prebuilt.chat_agent_executor import create_react_agent
diff --git a/libs/langgraph/tests/test_messages_state.py b/libs/langgraph/tests/test_messages_state.py
index a481123a4..0a1e78ecb 100644
--- a/libs/langgraph/tests/test_messages_state.py
+++ b/libs/langgraph/tests/test_messages_state.py
@@ -14,9 +14,10 @@ from langchain_core.messages import (
 from pydantic import BaseModel
 from typing_extensions import TypedDict
 
+from langgraph.constants import END, START
 from langgraph.graph import add_messages
 from langgraph.graph.message import REMOVE_ALL_MESSAGES, MessagesState, push_message
-from langgraph.graph.state import END, START, StateGraph
+from langgraph.graph.state import StateGraph
 from tests.messages import _AnyIdHumanMessage
 
 _, CORE_MINOR, CORE_PATCH = (int(v) for v in langchain_core.__version__.split("."))
diff --git a/libs/langgraph/tests/test_pregel.py b/libs/langgraph/tests/test_pregel.py
index a64f843da..df88212a0 100644
--- a/libs/langgraph/tests/test_pregel.py
+++ b/libs/langgraph/tests/test_pregel.py
@@ -28,6 +28,7 @@ from pytest_mock import MockerFixture
 from syrupy import SnapshotAssertion
 from typing_extensions import TypedDict
 
+from langgraph._internal._constants import CONFIG_KEY_NODE_FINISHED, ERROR, PULL
 from langgraph.cache.base import BaseCache
 from langgraph.channels.binop import BinaryOperatorAggregate
 from langgraph.channels.ephemeral_value import EphemeralValue
@@ -41,10 +42,9 @@ from langgraph.checkpoint.base import (
 )
 from langgraph.checkpoint.memory import InMemorySaver
 from langgraph.config import get_stream_writer
-from langgraph.constants import CONFIG_KEY_NODE_FINISHED, ERROR, PULL, START
 from langgraph.errors import GraphRecursionError, InvalidUpdateError, ParentCommand
 from langgraph.func import entrypoint, task
-from langgraph.graph import END, StateGraph
+from langgraph.graph import END, START, StateGraph
 from langgraph.graph.message import MessageGraph, MessagesState, add_messages
 from langgraph.prebuilt.tool_node import ToolNode
 from langgraph.pregel import (
diff --git a/libs/langgraph/tests/test_pregel_async.py b/libs/langgraph/tests/test_pregel_async.py
index b2e99af23..e81cb5e11 100644
--- a/libs/langgraph/tests/test_pregel_async.py
+++ b/libs/langgraph/tests/test_pregel_async.py
@@ -28,6 +28,7 @@ from pytest_mock import MockerFixture
 from syrupy import SnapshotAssertion
 from typing_extensions import TypedDict
 
+from langgraph._internal._constants import CONFIG_KEY_NODE_FINISHED, ERROR, PULL
 from langgraph.cache.base import BaseCache
 from langgraph.channels.binop import BinaryOperatorAggregate
 from langgraph.channels.last_value import LastValue
@@ -41,14 +42,13 @@ from langgraph.checkpoint.base import (
 )
 from langgraph.checkpoint.memory import InMemorySaver
 from langgraph.checkpoint.serde.jsonplus import JsonPlusSerializer
-from langgraph.constants import CONFIG_KEY_NODE_FINISHED, ERROR, PULL, START
 from langgraph.errors import (
     GraphRecursionError,
     InvalidUpdateError,
     ParentCommand,
 )
 from langgraph.func import entrypoint, task
-from langgraph.graph import END, StateGraph
+from langgraph.graph import END, START, StateGraph
 from langgraph.graph.message import MessagesState, add_messages
 from langgraph.prebuilt.tool_node import ToolNode
 from langgraph.pregel import NodeBuilder, Pregel
diff --git a/libs/langgraph/tests/test_utils.py b/libs/langgraph/tests/test_utils.py
index fabac0595..afe486af2 100644
--- a/libs/langgraph/tests/test_utils.py
+++ b/libs/langgraph/tests/test_utils.py
@@ -27,7 +27,8 @@ from langgraph._internal._runnable import (
     is_async_callable,
     is_async_generator,
 )
-from langgraph.graph import END, StateGraph
+from langgraph.constants import END
+from langgraph.graph import StateGraph
 from langgraph.graph.state import CompiledStateGraph
 
 pytestmark = pytest.mark.anyio