better typing

* one alternative considered was setting `frozen=True` on the dataclass,
but this is breaking, so a deprecation is a nicer approach

docs/_scripts/notebook_hooks.py

@@ -129,11 +129,25 @@ REDIRECT_MAP = {
     "how-tos/human_in_the_loop/edit-graph-state.ipynb": "https://docs.langchain.com/oss/python/langgraph/use-time-travel",
 
     # LGP mintlify migration redirects
+    "examples/index.md": "https://docs.langchain.com/oss/python/learn",
+    "guides/index.md": "https://docs.langchain.com/oss/python/langgraph/overview",
+    "concepts/index.md": "https://docs.langchain.com/oss/python/langgraph/overview",
+    "tutorials/index.md": "https://docs.langchain.com/oss/python/learn",
+    "llms-txt-overview.md": "https://docs.langchain.com/llms.txt",
+    "tutorials/rag/langgraph_adaptive_rag.md": "https://docs.langchain.com/oss/python/langgraph/agentic-rag",
+    "tutorials/multi_agent/multi-agent-collaboration.ipynb": "https://docs.langchain.com/oss/python/langchain/multi-agent",
+    "how-tos/create-react-agent-manage-message-history.ipynb": "https://docs.langchain.com/oss/python/langgraph/add-memory",
+    "how-tos/many-tools.ipynb": "https://docs.langchain.com/oss/python/langchain/tools",
+    "tutorials/customer-support/customer-support.ipynb": "https://docs.langchain.com/oss/python/langgraph/agentic-rag",
+    "how-tos/react-agent-structured-output.ipynb": "https://docs.langchain.com/oss/python/langchain/agents#structured-output",
+    "tutorials/code_assistant/langgraph_code_assistant.ipynb": "https://docs.langchain.com/oss/python/langgraph/agentic-rag",
+    "tutorials/multi_agent/hierarchical_agent_teams.ipynb": "https://docs.langchain.com/oss/python/langchain/supervisor",
     "tutorials/auth/getting_started.md": "https://docs.langchain.com/langsmith/auth",
     "tutorials/auth/resource_auth.md": "https://docs.langchain.com/langsmith/resource-auth",
     "tutorials/auth/add_auth_server.md": "https://docs.langchain.com/langsmith/add-auth-server",
     "how-tos/use-remote-graph.md": "https://docs.langchain.com/langsmith/use-remote-graph",
     "how-tos/autogen-integration.md": "https://docs.langchain.com/langsmith/autogen-integration",
+    "how-tos/human_in_the_loop/wait-user-input.ipynb": "https://docs.langchain.com/oss/python/langgraph/interrupts",
     "cloud/how-tos/use_stream_react.md": "https://docs.langchain.com/langsmith/use-stream-react",
     "cloud/how-tos/generative_ui_react.md": "https://docs.langchain.com/langsmith/generative-ui-react",
     "concepts/langgraph_platform.md": "https://docs.langchain.com/langsmith/deployments",
@@ -219,12 +233,15 @@ REDIRECT_MAP = {
     "tutorials/get-started/6-time-travel.md": "https://docs.langchain.com/oss/python/langgraph/quickstart",
     "tutorials/langsmith/local-server.md": "https://docs.langchain.com/oss/python/langgraph/local-server",
     "tutorials/workflows.md": "https://docs.langchain.com/oss/python/langgraph/workflows-agents",
+    "tutorials/plan-and-execute/plan-and-execute.ipynb": "https://docs.langchain.com/oss/python/langchain/middleware/built-in#to-do-list",
+    "tutorials/langgraph-platform/local-server/local-server.md": "https://docs.langchain.com/langsmith/local-server",
     "concepts/agentic_concepts.md": "https://docs.langchain.com/oss/python/langgraph/workflows-agents",
     "guides/index.md": "https://docs.langchain.com/oss/python/langchain/overview",
     "agents/overview.md": "https://docs.langchain.com/oss/python/langchain/agents",
     "agents/run_agents.md": "https://docs.langchain.com/oss/python/langgraph/quickstart",
     "concepts/low_level.md": "https://docs.langchain.com/oss/python/langgraph/graph-api",
     "how-tos/graph-api.md": "https://docs.langchain.com/oss/python/langgraph/graph-api",
+    "how-tos/react-agent-from-scratch.ipynb": "https://docs.langchain.com/oss/python/langchain/quickstart",
     "concepts/functional_api.md": "https://docs.langchain.com/oss/python/langgraph/functional-api",
     "how-tos/use-functional-api.md": "https://docs.langchain.com/oss/python/langgraph/functional-api",
     "concepts/pregel.md": "https://docs.langchain.com/oss/python/langgraph/pregel",
@@ -282,8 +299,8 @@ REDIRECT_MAP = {
     "reference/supervisor.md": "https://reference.langchain.com/python/langgraph/supervisor/",
     "reference/swarm.md": "https://reference.langchain.com/python/langgraph/swarm/",
     "reference/mcp.md": "https://reference.langchain.com/python/langgraph/mcp/",
-    "cloud/reference/sdk/python_sdk_ref.md": "https://reference.langchain.com/python/platform/python_sdk/",
-    "reference/remote_graph.md": "https://reference.langchain.com/python/platform/remote_graph/",
+    "cloud/reference/sdk/python_sdk_ref.md": "https://reference.langchain.com/python/langsmith/deployment/sdk/",
+    "reference/remote_graph.md": "https://reference.langchain.com/python/langsmith/deployment/remote_graph/",
 
     # additional exclude-search entries from mkdocs.yml
     "additional-resources/index.md": "https://docs.langchain.com/oss/python/langchain/overview",
@@ -793,6 +810,17 @@ def on_post_build(config):
     # Track which paths have explicit redirects
     redirected_paths = set()
 
+    # Collect all existing HTML files in the site
+    all_html_files = set()
+    for root, dirs, files in os.walk(site_dir):
+        for file in files:
+            if file.endswith(".html"):
+                # Get relative path from site_dir
+                html_path = os.path.relpath(os.path.join(root, file), site_dir)
+                # Normalize path separators to forward slashes
+                html_path = html_path.replace(os.sep, "/")
+                all_html_files.add(html_path)
+
     # Process explicit redirects from REDIRECT_MAP
     for page_old, page_new in REDIRECT_MAP.items():
         # Convert .ipynb to .md for path calculation
@@ -847,6 +875,24 @@ def on_post_build(config):
 
             _write_html(site_dir, old_html_path, new_html_path)
 
+    # Create catch-all redirects for any HTML files not explicitly redirected
+    catchall_url = "https://docs.langchain.com/oss/python/langgraph/overview"
+    for html_file in all_html_files:
+        # Skip if this file is already explicitly redirected
+        if html_file in redirected_paths:
+            continue
+
+        # Skip the root index.html (we handle that separately)
+        if html_file == "index.html":
+            continue
+
+        # Skip reference documentation (keep those accessible)
+        if html_file.startswith("reference/"):
+            continue
+
+        # Create redirect for this unmapped file
+        _write_html(site_dir, html_file, catchall_url)
+
     # Create root index.html redirect
     root_redirect_html = """<!doctype html>
 <html lang="en">

libs/checkpoint-postgres/langgraph/store/postgres/base.py

@@ -91,7 +91,12 @@ WHERE expires_at IS NOT NULL;
 VECTOR_MIGRATIONS: Sequence[Migration] = [
     Migration(
         """
-CREATE EXTENSION IF NOT EXISTS vector;
+DO $$
+BEGIN
+    IF NOT EXISTS (SELECT 1 FROM pg_extension WHERE extname = 'vector') THEN
+        CREATE EXTENSION vector;
+    END IF;
+END $$;
 """,
     ),
     Migration(

libs/langgraph/.claude/settings.local.json

@@ -1,16 +0,0 @@
-{
-  "permissions": {
-    "allow": [
-      "Bash(rg:*)",
-      "Bash(python:*)",
-      "Bash(grep:*)",
-      "Bash(sed:*)",
-      "Bash(awk:*)",
-      "Bash(uv run mypy:*)",
-      "Bash(uv run:*)",
-      "Bash(make test:*)",
-      "Bash(make test_parallel:*)"
-    ],
-    "deny": []
-  }
-}

libs/langgraph/langgraph/func/__init__.py

@@ -151,13 +151,13 @@ def task(
 
 
         @task
-        def add_one(a: int) -> int:
+        def add_one_task(a: int) -> int:
             return a + 1
 
 
         @entrypoint()
         def add_one(numbers: list[int]) -> list[int]:
-            futures = [add_one(n) for n in numbers]
+            futures = [add_one_task(n) for n in numbers]
             results = [f.result() for f in futures]
             return results
 
@@ -173,13 +173,13 @@ def task(
 
 
         @task
-        async def add_one(a: int) -> int:
+        async def add_one_task(a: int) -> int:
             return a + 1
 
 
         @entrypoint()
         async def add_one(numbers: list[int]) -> list[int]:
-            futures = [add_one(n) for n in numbers]
+            futures = [add_one_task(n) for n in numbers]
             return asyncio.gather(*futures)
 
 

libs/langgraph/langgraph/graph/state.py

@@ -110,12 +110,20 @@ def _get_node_name(node: StateNode[Any, ContextT]) -> str:
 
 class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
     """A graph whose nodes communicate by reading and writing to a shared state.
-    The signature of each node is State -> Partial<State>.
+
+    The signature of each node is `State -> Partial<State>`.
 
     Each state key can optionally be annotated with a reducer function that
     will be used to aggregate the values of that key received from multiple nodes.
     The signature of a reducer function is `(Value, Value) -> Value`.
 
+    !!! warning
+
+        `StateGraph` is a builder class and cannot be used directly for execution.
+        You must first call `.compile()` to create an executable graph that supports
+        methods like `invoke()`, `stream()`, `astream()`, and `ainvoke()`. See the
+        `CompiledStateGraph` documentation for more details.
+
     Args:
         state_schema: The schema class that defines the state.
         context_schema: The schema class that defines the runtime context.

libs/langgraph/langgraph/pregel/_algo.py

@@ -258,9 +258,11 @@ def apply_writes(
         next_version = None
     else:
         next_version = get_next_version(
-            max(checkpoint["channel_versions"].values())
-            if checkpoint["channel_versions"]
-            else None,
+            (
+                max(checkpoint["channel_versions"].values())
+                if checkpoint["channel_versions"]
+                else None
+            ),
             None,
         )
 
@@ -491,6 +493,11 @@ def prepare_next_tasks(
 PUSH_TRIGGER = (PUSH,)
 
 
+class _TaskIDFn(Protocol):
+    def __call__(self, namespace: bytes, *parts: str | bytes) -> str:
+        pass
+
+
 def prepare_single_task(
     task_path: tuple[Any, ...],
     task_id_checksum: str | None,
@@ -520,250 +527,50 @@ def prepare_single_task(
     task_id_func = _xxhash_str if checkpoint["v"] > 1 else _uuid5_str
 
     if task_path[0] == PUSH and isinstance(task_path[-1], Call):
-        # (PUSH, parent task path, idx of PUSH write, id of parent task, Call)
-        task_path_t = cast(tuple[str, tuple, int, str, Call], task_path)
-        call = task_path_t[-1]
-        proc_ = get_runnable_for_task(call.func)
-        name = proc_.name
-        if name is None:
-            raise ValueError("`call` functions must have a `__name__` attribute")
-        # create task id
-        triggers: Sequence[str] = PUSH_TRIGGER
-        checkpoint_ns = f"{parent_ns}{NS_SEP}{name}" if parent_ns else name
-        task_id = task_id_func(
-            checkpoint_id_bytes,
-            checkpoint_ns,
-            str(step),
-            name,
-            PUSH,
-            task_path_str(task_path[1]),
-            str(task_path[2]),
+        return prepare_push_task_functional(
+            cast(tuple[str, tuple, int, str, Call], task_path),
+            task_id_checksum,
+            checkpoint=checkpoint,
+            checkpoint_id_bytes=checkpoint_id_bytes,
+            pending_writes=pending_writes,
+            channels=channels,
+            managed=managed,
+            config=config,
+            step=step,
+            stop=stop,
+            for_execution=for_execution,
+            store=store,
+            checkpointer=checkpointer,
+            manager=manager,
+            cache_policy=cache_policy,
+            retry_policy=retry_policy,
+            parent_ns=parent_ns,
+            task_id_func=task_id_func,
+        )
+
+    elif task_path[0] == PUSH:
+        return prepare_push_task_send(
+            cast(tuple[str, tuple], task_path),
+            task_id_checksum,
+            checkpoint=checkpoint,
+            checkpoint_id_bytes=checkpoint_id_bytes,
+            pending_writes=pending_writes,
+            channels=channels,
+            managed=managed,
+            config=config,
+            step=step,
+            processes=processes,
+            stop=stop,
+            for_execution=for_execution,
+            store=store,
+            checkpointer=checkpointer,
+            manager=manager,
+            cache_policy=cache_policy,
+            retry_policy=retry_policy,
+            parent_ns=parent_ns,
+            task_id_func=task_id_func,
         )
-        task_checkpoint_ns = f"{checkpoint_ns}:{task_id}"
-        # we append True to the task path to indicate that a call is being
-        # made, so we should not return interrupts from this task (responsibility lies with the parent)
-        task_path = (*task_path[:3], True)
-        metadata = {
-            "langgraph_step": step,
-            "langgraph_node": name,
-            "langgraph_triggers": triggers,
-            "langgraph_path": task_path,
-            "langgraph_checkpoint_ns": task_checkpoint_ns,
-        }
-        if task_id_checksum is not None:
-            assert task_id == task_id_checksum, f"{task_id} != {task_id_checksum}"
-        if for_execution:
-            writes: deque[tuple[str, Any]] = deque()
-            cache_policy = call.cache_policy or cache_policy
-            if cache_policy:
-                args_key = cache_policy.key_func(*call.input[0], **call.input[1])
-                cache_key: CacheKey | None = CacheKey(
-                    (
-                        CACHE_NS_WRITES,
-                        (identifier(call.func) or "__dynamic__"),
-                    ),
-                    xxh3_128_hexdigest(
-                        args_key.encode() if isinstance(args_key, str) else args_key,
-                    ),
-                    cache_policy.ttl,
-                )
-            else:
-                cache_key = None
-            scratchpad = _scratchpad(
-                config[CONF].get(CONFIG_KEY_SCRATCHPAD),
-                pending_writes,
-                task_id,
-                xxh3_128_hexdigest(task_checkpoint_ns.encode()),
-                config[CONF].get(CONFIG_KEY_RESUME_MAP),
-                step,
-                stop,
-            )
-            runtime = cast(
-                Runtime, configurable.get(CONFIG_KEY_RUNTIME, DEFAULT_RUNTIME)
-            )
-            runtime = runtime.override(store=store)
-            return PregelExecutableTask(
-                name,
-                call.input,
-                proc_,
-                writes,
-                patch_config(
-                    merge_configs(config, {"metadata": metadata}),
-                    run_name=name,
-                    callbacks=call.callbacks
-                    or (manager.get_child(f"graph:step:{step}") if manager else None),
-                    configurable={
-                        CONFIG_KEY_TASK_ID: task_id,
-                        # deque.extend is thread-safe
-                        CONFIG_KEY_SEND: writes.extend,
-                        CONFIG_KEY_READ: partial(
-                            local_read,
-                            scratchpad,
-                            channels,
-                            managed,
-                            PregelTaskWrites(task_path, name, writes, triggers),
-                        ),
-                        CONFIG_KEY_CHECKPOINTER: (
-                            checkpointer or configurable.get(CONFIG_KEY_CHECKPOINTER)
-                        ),
-                        CONFIG_KEY_CHECKPOINT_MAP: {
-                            **configurable.get(CONFIG_KEY_CHECKPOINT_MAP, {}),
-                            parent_ns: checkpoint["id"],
-                        },
-                        CONFIG_KEY_CHECKPOINT_ID: None,
-                        CONFIG_KEY_CHECKPOINT_NS: task_checkpoint_ns,
-                        CONFIG_KEY_SCRATCHPAD: scratchpad,
-                        CONFIG_KEY_RUNTIME: runtime,
-                    },
-                ),
-                triggers,
-                call.retry_policy or retry_policy,
-                cache_key,
-                task_id,
-                task_path,
-            )
-        else:
-            return PregelTask(task_id, name, task_path)
-    elif task_path[0] == PUSH:
-        if len(task_path) == 2:
-            # SEND tasks, executed in superstep n+1
-            # (PUSH, idx of pending send)
-            idx = cast(int, task_path[1])
-            if not channels[TASKS].is_available():
-                return
-            sends: Sequence[Send] = channels[TASKS].get()
-            if idx < 0 or idx >= len(sends):
-                return
-            packet = sends[idx]
-            if not isinstance(packet, Send):
-                logger.warning(
-                    f"Ignoring invalid packet type {type(packet)} in pending sends"
-                )
-                return
 
-            if packet.node not in processes:
-                logger.warning(
-                    f"Ignoring unknown node name {packet.node} in pending sends"
-                )
-                return
-            # find process
-            proc = processes[packet.node]
-            proc_node = proc.node
-            if proc_node is None:
-                return
-            # create task id
-            triggers = PUSH_TRIGGER
-            checkpoint_ns = (
-                f"{parent_ns}{NS_SEP}{packet.node}" if parent_ns else packet.node
-            )
-            task_id = task_id_func(
-                checkpoint_id_bytes,
-                checkpoint_ns,
-                str(step),
-                packet.node,
-                PUSH,
-                str(idx),
-            )
-        else:
-            logger.warning(f"Ignoring invalid PUSH task path {task_path}")
-            return
-        task_checkpoint_ns = f"{checkpoint_ns}:{task_id}"
-        # we append False to the task path to indicate that a call is not being made
-        # so we should return interrupts from this task
-        task_path = (*task_path[:3], False)
-        metadata = {
-            "langgraph_step": step,
-            "langgraph_node": packet.node,
-            "langgraph_triggers": triggers,
-            "langgraph_path": task_path,
-            "langgraph_checkpoint_ns": task_checkpoint_ns,
-        }
-        if task_id_checksum is not None:
-            assert task_id == task_id_checksum, f"{task_id} != {task_id_checksum}"
-        if for_execution:
-            if proc.metadata:
-                metadata.update(proc.metadata)
-            writes = deque()
-            cache_policy = proc.cache_policy or cache_policy
-            if cache_policy:
-                args_key = cache_policy.key_func(packet.arg)
-                cache_key = CacheKey(
-                    (
-                        CACHE_NS_WRITES,
-                        (identifier(proc) or "__dynamic__"),
-                        packet.node,
-                    ),
-                    xxh3_128_hexdigest(
-                        args_key.encode() if isinstance(args_key, str) else args_key,
-                    ),
-                    cache_policy.ttl,
-                )
-            else:
-                cache_key = None
-            scratchpad = _scratchpad(
-                config[CONF].get(CONFIG_KEY_SCRATCHPAD),
-                pending_writes,
-                task_id,
-                xxh3_128_hexdigest(task_checkpoint_ns.encode()),
-                config[CONF].get(CONFIG_KEY_RESUME_MAP),
-                step,
-                stop,
-            )
-            runtime = cast(
-                Runtime, configurable.get(CONFIG_KEY_RUNTIME, DEFAULT_RUNTIME)
-            )
-            runtime = runtime.override(
-                store=store, previous=checkpoint["channel_values"].get(PREVIOUS, None)
-            )
-            additional_config: RunnableConfig = {
-                "metadata": metadata,
-                "tags": proc.tags,
-            }
-            return PregelExecutableTask(
-                packet.node,
-                packet.arg,
-                proc_node,
-                writes,
-                patch_config(
-                    merge_configs(config, additional_config),
-                    run_name=packet.node,
-                    callbacks=(
-                        manager.get_child(f"graph:step:{step}") if manager else None
-                    ),
-                    configurable={
-                        CONFIG_KEY_TASK_ID: task_id,
-                        # deque.extend is thread-safe
-                        CONFIG_KEY_SEND: writes.extend,
-                        CONFIG_KEY_READ: partial(
-                            local_read,
-                            scratchpad,
-                            channels,
-                            managed,
-                            PregelTaskWrites(task_path, packet.node, writes, triggers),
-                        ),
-                        CONFIG_KEY_CHECKPOINTER: (
-                            checkpointer or configurable.get(CONFIG_KEY_CHECKPOINTER)
-                        ),
-                        CONFIG_KEY_CHECKPOINT_MAP: {
-                            **configurable.get(CONFIG_KEY_CHECKPOINT_MAP, {}),
-                            parent_ns: checkpoint["id"],
-                        },
-                        CONFIG_KEY_CHECKPOINT_ID: None,
-                        CONFIG_KEY_CHECKPOINT_NS: task_checkpoint_ns,
-                        CONFIG_KEY_SCRATCHPAD: scratchpad,
-                        CONFIG_KEY_RUNTIME: runtime,
-                    },
-                ),
-                triggers,
-                proc.retry_policy or retry_policy,
-                cache_key,
-                task_id,
-                task_path,
-                writers=proc.flat_writers,
-                subgraphs=proc.subgraphs,
-            )
-        else:
-            return PregelTask(task_id, packet.node, task_path)
     elif task_path[0] == PULL:
         # (PULL, node name)
         name = cast(str, task_path[1])
@@ -834,7 +641,7 @@ def prepare_single_task(
                 if node := proc.node:
                     if proc.metadata:
                         metadata.update(proc.metadata)
-                    writes = deque()
+                    writes: deque[tuple[str, Any]] = deque()
                     cache_policy = proc.cache_policy or cache_policy
                     if cache_policy:
                         args_key = cache_policy.key_func(val)
@@ -845,9 +652,11 @@ def prepare_single_task(
                                 name,
                             ),
                             xxh3_128_hexdigest(
-                                args_key.encode()
-                                if isinstance(args_key, str)
-                                else args_key,
+                                (
+                                    args_key.encode()
+                                    if isinstance(args_key, str)
+                                    else args_key
+                                ),
                             ),
                             cache_policy.ttl,
                         )
@@ -870,7 +679,9 @@ def prepare_single_task(
                         node,
                         writes,
                         patch_config(
-                            merge_configs(config, additional_config),
+                            merge_configs(
+                                config, cast(RunnableConfig, additional_config)
+                            ),
                             run_name=name,
                             callbacks=(
                                 manager.get_child(f"graph:step:{step}")
@@ -919,6 +730,297 @@ def prepare_single_task(
                 return PregelTask(task_id, name, task_path[:3])
 
 
+def prepare_push_task_functional(
+    task_path: tuple[str, tuple, int, str, Call],
+    # (PUSH, parent task path, idx of PUSH write, id of parent task, Call)
+    task_id_checksum: str | None,
+    *,
+    checkpoint: Checkpoint,
+    checkpoint_id_bytes: bytes,
+    pending_writes: list[PendingWrite],
+    channels: Mapping[str, BaseChannel],
+    managed: ManagedValueMapping,
+    config: RunnableConfig,
+    step: int,
+    stop: int,
+    for_execution: bool,
+    store: BaseStore | None = None,
+    checkpointer: BaseCheckpointSaver | None = None,
+    manager: None | ParentRunManager | AsyncParentRunManager = None,
+    cache_policy: CachePolicy | None = None,
+    retry_policy: Sequence[RetryPolicy] = (),
+    parent_ns: str,
+    # namespace: bytes, *parts: str | bytes
+    task_id_func: _TaskIDFn,
+) -> PregelTask | PregelExecutableTask:
+    """Prepare a push task with an attached caller. Used for the functional API."""
+    configurable = config.get(CONF, {})
+
+    call = task_path[-1]
+    proc_ = get_runnable_for_task(call.func)
+    name = proc_.name
+    if name is None:
+        raise ValueError("`call` functions must have a `__name__` attribute")
+    # create task id
+    triggers: Sequence[str] = PUSH_TRIGGER
+    checkpoint_ns = f"{parent_ns}{NS_SEP}{name}" if parent_ns else name
+    task_id = task_id_func(
+        checkpoint_id_bytes,
+        checkpoint_ns,
+        str(step),
+        name,
+        PUSH,
+        task_path_str(task_path[1]),
+        str(task_path[2]),
+    )
+    task_checkpoint_ns = f"{checkpoint_ns}:{task_id}"
+    # we append True to the task path to indicate that a call is being
+    # made, so we should not return interrupts from this task (responsibility lies with the parent)
+    in_progress_task_path = (*task_path[:3], True)
+    metadata = {
+        "langgraph_step": step,
+        "langgraph_node": name,
+        "langgraph_triggers": triggers,
+        "langgraph_path": in_progress_task_path,
+        "langgraph_checkpoint_ns": task_checkpoint_ns,
+    }
+    if task_id_checksum is not None:
+        assert task_id == task_id_checksum, f"{task_id} != {task_id_checksum}"
+    if for_execution:
+        writes: deque[tuple[str, Any]] = deque()
+        cache_policy = call.cache_policy or cache_policy
+        if cache_policy:
+            args_key = cache_policy.key_func(*call.input[0], **call.input[1])
+            cache_key: CacheKey | None = CacheKey(
+                (
+                    CACHE_NS_WRITES,
+                    (identifier(call.func) or "__dynamic__"),
+                ),
+                xxh3_128_hexdigest(
+                    args_key.encode() if isinstance(args_key, str) else args_key,
+                ),
+                cache_policy.ttl,
+            )
+        else:
+            cache_key = None
+        scratchpad = _scratchpad(
+            configurable.get(CONFIG_KEY_SCRATCHPAD),
+            pending_writes,
+            task_id,
+            xxh3_128_hexdigest(task_checkpoint_ns.encode()),
+            configurable.get(CONFIG_KEY_RESUME_MAP),
+            step,
+            stop,
+        )
+        runtime = cast(Runtime, configurable.get(CONFIG_KEY_RUNTIME, DEFAULT_RUNTIME))
+        runtime = runtime.override(store=store)
+        return PregelExecutableTask(
+            name,
+            call.input,
+            proc_,
+            writes,
+            patch_config(
+                merge_configs(config, {"metadata": metadata}),
+                run_name=name,
+                callbacks=call.callbacks
+                or (manager.get_child(f"graph:step:{step}") if manager else None),
+                configurable={
+                    CONFIG_KEY_TASK_ID: task_id,
+                    # deque.extend is thread-safe
+                    CONFIG_KEY_SEND: writes.extend,
+                    CONFIG_KEY_READ: partial(
+                        local_read,
+                        scratchpad,
+                        channels,
+                        managed,
+                        PregelTaskWrites(in_progress_task_path, name, writes, triggers),
+                    ),
+                    CONFIG_KEY_CHECKPOINTER: (
+                        checkpointer or configurable.get(CONFIG_KEY_CHECKPOINTER)
+                    ),
+                    CONFIG_KEY_CHECKPOINT_MAP: {
+                        **configurable.get(CONFIG_KEY_CHECKPOINT_MAP, {}),
+                        parent_ns: checkpoint["id"],
+                    },
+                    CONFIG_KEY_CHECKPOINT_ID: None,
+                    CONFIG_KEY_CHECKPOINT_NS: task_checkpoint_ns,
+                    CONFIG_KEY_SCRATCHPAD: scratchpad,
+                    CONFIG_KEY_RUNTIME: runtime,
+                },
+            ),
+            triggers,
+            call.retry_policy or retry_policy,
+            cache_key,
+            task_id,
+            in_progress_task_path,
+        )
+    else:
+        return PregelTask(task_id, name, in_progress_task_path)
+
+
+def prepare_push_task_send(
+    task_path: tuple[str, tuple],
+    # (PUSH, parent task path)
+    task_id_checksum: str | None,
+    *,
+    checkpoint: Checkpoint,
+    checkpoint_id_bytes: bytes,
+    pending_writes: list[PendingWrite],
+    channels: Mapping[str, BaseChannel],
+    managed: ManagedValueMapping,
+    config: RunnableConfig,
+    step: int,
+    stop: int,
+    for_execution: bool,
+    store: BaseStore | None = None,
+    checkpointer: BaseCheckpointSaver | None = None,
+    manager: None | ParentRunManager | AsyncParentRunManager = None,
+    cache_policy: CachePolicy | None = None,
+    retry_policy: Sequence[RetryPolicy] = (),
+    parent_ns: str,
+    task_id_func: _TaskIDFn,
+    processes: Mapping[str, PregelNode],
+) -> PregelTask | PregelExecutableTask | None:
+    if len(task_path) == 2:
+        # SEND tasks, executed in superstep n+1
+        # (PUSH, idx of pending send)
+        idx = cast(int, task_path[1])
+        if not channels[TASKS].is_available():
+            return
+        sends: Sequence[Send] = channels[TASKS].get()
+        if idx < 0 or idx >= len(sends):
+            return
+        packet = sends[idx]
+        if not isinstance(packet, Send):
+            logger.warning(
+                f"Ignoring invalid packet type {type(packet)} in pending sends"
+            )
+            return
+
+        if packet.node not in processes:
+            logger.warning(f"Ignoring unknown node name {packet.node} in pending sends")
+            return
+        # find process
+        proc = processes[packet.node]
+        proc_node = proc.node
+        if proc_node is None:
+            return
+        # create task id
+        triggers = PUSH_TRIGGER
+        checkpoint_ns = (
+            f"{parent_ns}{NS_SEP}{packet.node}" if parent_ns else packet.node
+        )
+        task_id = task_id_func(
+            checkpoint_id_bytes,
+            checkpoint_ns,
+            str(step),
+            packet.node,
+            PUSH,
+            str(idx),
+        )
+    else:
+        logger.warning(f"Ignoring invalid PUSH task path {task_path}")
+        return
+    configurable = config.get(CONF, {})
+    task_checkpoint_ns = f"{checkpoint_ns}:{task_id}"
+    # we append False to the task path to indicate that a call is not being made
+    # so we should return interrupts from this task
+    translated_task_path = (*task_path[:3], False)
+    metadata = {
+        "langgraph_step": step,
+        "langgraph_node": packet.node,
+        "langgraph_triggers": triggers,
+        "langgraph_path": translated_task_path,
+        "langgraph_checkpoint_ns": task_checkpoint_ns,
+    }
+    if task_id_checksum is not None:
+        assert task_id == task_id_checksum, f"{task_id} != {task_id_checksum}"
+    if for_execution:
+        if proc.metadata:
+            metadata.update(proc.metadata)
+        writes: deque[tuple[str, Any]] = deque()
+        cache_policy = proc.cache_policy or cache_policy
+        if cache_policy:
+            args_key = cache_policy.key_func(packet.arg)
+            cache_key = CacheKey(
+                (
+                    CACHE_NS_WRITES,
+                    (identifier(proc) or "__dynamic__"),
+                    packet.node,
+                ),
+                xxh3_128_hexdigest(
+                    args_key.encode() if isinstance(args_key, str) else args_key,
+                ),
+                cache_policy.ttl,
+            )
+        else:
+            cache_key = None
+        scratchpad = _scratchpad(
+            config[CONF].get(CONFIG_KEY_SCRATCHPAD),
+            pending_writes,
+            task_id,
+            xxh3_128_hexdigest(task_checkpoint_ns.encode()),
+            config[CONF].get(CONFIG_KEY_RESUME_MAP),
+            step,
+            stop,
+        )
+        runtime = cast(Runtime, configurable.get(CONFIG_KEY_RUNTIME, DEFAULT_RUNTIME))
+        runtime = runtime.override(
+            store=store, previous=checkpoint["channel_values"].get(PREVIOUS, None)
+        )
+        additional_config: RunnableConfig = {
+            "metadata": metadata,
+            "tags": proc.tags,
+        }
+        return PregelExecutableTask(
+            packet.node,
+            packet.arg,
+            proc_node,
+            writes,
+            patch_config(
+                merge_configs(config, additional_config),
+                run_name=packet.node,
+                callbacks=(
+                    manager.get_child(f"graph:step:{step}") if manager else None
+                ),
+                configurable={
+                    CONFIG_KEY_TASK_ID: task_id,
+                    # deque.extend is thread-safe
+                    CONFIG_KEY_SEND: writes.extend,
+                    CONFIG_KEY_READ: partial(
+                        local_read,
+                        scratchpad,
+                        channels,
+                        managed,
+                        PregelTaskWrites(
+                            translated_task_path, packet.node, writes, triggers
+                        ),
+                    ),
+                    CONFIG_KEY_CHECKPOINTER: (
+                        checkpointer or configurable.get(CONFIG_KEY_CHECKPOINTER)
+                    ),
+                    CONFIG_KEY_CHECKPOINT_MAP: {
+                        **configurable.get(CONFIG_KEY_CHECKPOINT_MAP, {}),
+                        parent_ns: checkpoint["id"],
+                    },
+                    CONFIG_KEY_CHECKPOINT_ID: None,
+                    CONFIG_KEY_CHECKPOINT_NS: task_checkpoint_ns,
+                    CONFIG_KEY_SCRATCHPAD: scratchpad,
+                    CONFIG_KEY_RUNTIME: runtime,
+                },
+            ),
+            triggers,
+            proc.retry_policy or retry_policy,
+            cache_key,
+            task_id,
+            translated_task_path,
+            writers=proc.flat_writers,
+            subgraphs=proc.subgraphs,
+        )
+    else:
+        return PregelTask(task_id, packet.node, translated_task_path)
+
+
 def checkpoint_null_version(
     checkpoint: Checkpoint,
 ) -> V | None:

libs/langgraph/langgraph/pregel/main.py

@@ -2431,6 +2431,7 @@ class Pregel(
                     Will be emitted as 2-tuples `(LLM token, metadata)`.
                 - `"checkpoints"`: Emit an event when a checkpoint is created, in the same format as returned by `get_state()`.
                 - `"tasks"`: Emit events when tasks start and finish, including their results and errors.
+                - `"debug"`: Emit debug events with as much information as possible for each step.
 
                 You can pass a list as the `stream_mode` parameter to stream multiple modes at once.
                 The streamed outputs will be tuples of `(mode, data)`.
@@ -2697,6 +2698,8 @@ class Pregel(
                 - `"custom"`: Emit custom data from inside nodes or tasks using `StreamWriter`.
                 - `"messages"`: Emit LLM messages token-by-token together with metadata for any LLM invocations inside nodes or tasks.
                     Will be emitted as 2-tuples `(LLM token, metadata)`.
+                - `"checkpoints"`: Emit an event when a checkpoint is created, in the same format as returned by `get_state()`.
+                - `"tasks"`: Emit events when tasks start and finish, including their results and errors.
                 - `"debug"`: Emit debug events with as much information as possible for each step.
 
                 You can pass a list as the `stream_mode` parameter to stream multiple modes at once.
@@ -3101,31 +3104,30 @@ class Pregel(
         durability: Durability | None = None,
         **kwargs: Any,
     ) -> dict[str, Any] | Any:
-        """Asynchronously invoke the graph on a single input.
+        """Asynchronously run the graph with a single input and config.
 
         Args:
-            input: The input data for the computation. It can be a dictionary or any other type.
-            config: The configuration for the computation.
+            input: The input data for the graph. It can be a dictionary or any other type.
+            config: The configuration for the graph run.
             context: The static context to use for the run.
                 !!! version-added "Added in version 0.6.0"
-            stream_mode: The stream mode for the computation.
+            stream_mode: The stream mode for the graph run.
             print_mode: Accepts the same values as `stream_mode`, but only prints the output to the console, for debugging purposes. Does not affect the output of the graph in any way.
-            output_keys: The output keys to include in the result.
-            interrupt_before: The nodes to interrupt before.
-            interrupt_after: The nodes to interrupt after.
+            output_keys: The output keys to retrieve from the graph run.
+            interrupt_before: The nodes to interrupt the graph run before.
+            interrupt_after: The nodes to interrupt the graph run after.
             durability: The durability mode for the graph execution, defaults to `"async"`.
                 Options are:
 
                 - `"sync"`: Changes are persisted synchronously before the next step starts.
                 - `"async"`: Changes are persisted asynchronously while the next step executes.
                 - `"exit"`: Changes are persisted only when the graph exits.
-            **kwargs: Additional keyword arguments.
+            **kwargs: Additional keyword arguments to pass to the graph run.
 
         Returns:
-            The result of the computation. If `stream_mode` is `"values"`, it returns the latest value.
-            If `stream_mode` is `"chunks"`, it returns a list of chunks.
+            The output of the graph run. If `stream_mode` is `"values"`, it returns the latest output.
+            If `stream_mode` is not `"values"`, it returns a list of output chunks.
         """
-
         output_keys = output_keys if output_keys is not None else self.output_channels
 
         latest: dict[str, Any] | Any = None

libs/langgraph/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph"
-version = "1.0.2"
+version = "1.0.3"
 description = "Building stateful, multi-actor applications with LLMs"
 authors = []
 requires-python = ">=3.10"

libs/langgraph/uv.lock

@@ -1,5 +1,5 @@
 version = 1
-revision = 3
+revision = 2
 requires-python = ">=3.10"
 resolution-markers = [
     "python_full_version >= '3.14'",
@@ -1345,7 +1345,7 @@ wheels = [
 
 [[package]]
 name = "langgraph"
-version = "1.0.2"
+version = "1.0.3"
 source = { editable = "." }
 dependencies = [
     { name = "langchain-core" },
@@ -1710,7 +1710,7 @@ test = [
 
 [[package]]
 name = "langgraph-prebuilt"
-version = "1.0.2"
+version = "1.0.4"
 source = { editable = "../prebuilt" }
 dependencies = [
     { name = "langchain-core" },

libs/prebuilt/.claude/settings.local.json

@@ -0,0 +1,21 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(make test:*)",
+      "Bash(uv run pytest:*)",
+      "Bash(LANGGRAPH_TEST_FAST=0 make start-services:*)",
+      "Bash(LANGGRAPH_TEST_FAST=0 uv run:*)",
+      "Bash(EXIT_CODE=$?)",
+      "Bash(make stop-services:*)",
+      "Bash(exit $EXIT_CODE)",
+      "Read(//Users/sydney_runkle/oss/langgraph/**)",
+      "Bash(python3:*)",
+      "Bash(find:*)",
+      "Bash(python -m pytest:*)",
+      "Bash(python:*)",
+      "Read(//tmp/**)"
+    ],
+    "deny": [],
+    "ask": []
+  }
+}

libs/prebuilt/langgraph/prebuilt/chat_agent_executor.py

@@ -63,7 +63,7 @@ class AgentState(TypedDict):
 
 
 @deprecated(
-    "AgentStatePydantic has been moved to `langchain.agents`. Please update your import to `from langchain.agents import AgentStatePydantic`.",
+    "AgentStatePydantic has been deprecated in favor of AgentState in `langchain.agents`.",
     category=LangGraphDeprecatedSinceV10,
 )
 class AgentStatePydantic(BaseModel):
@@ -78,11 +78,11 @@ with warnings.catch_warnings():
     warnings.filterwarnings(
         "ignore",
         category=LangGraphDeprecatedSinceV10,
-        message="AgentState has been moved to langchain.agents.*",
+        message="AgentState has been moved to `langchain.agents`.*",
     )
 
     @deprecated(
-        "AgentStateWithStructuredResponse has been moved to `langchain.agents`. Please update your import to `from langchain.agents import AgentStateWithStructuredResponse`.",
+        "AgentStateWithStructuredResponse has been deprecated in favor of AgentState in `langchain.agents`.",
         category=LangGraphDeprecatedSinceV10,
     )
     class AgentStateWithStructuredResponse(AgentState):
@@ -95,11 +95,11 @@ with warnings.catch_warnings():
     warnings.filterwarnings(
         "ignore",
         category=LangGraphDeprecatedSinceV10,
-        message="AgentStatePydantic has been moved to langchain.agents.*",
+        message="AgentStatePydantic has been deprecated in favor of AgentState in `langchain.agents`.",
     )
 
     @deprecated(
-        "AgentStateWithStructuredResponsePydantic has been moved to `langchain.agents`. Please update your import to `from langchain.agents import AgentStateWithStructuredResponsePydantic`.",
+        "AgentStateWithStructuredResponsePydantic has been deprecated in favor of AgentState in `langchain.agents`.",
         category=LangGraphDeprecatedSinceV10,
     )
     class AgentStateWithStructuredResponsePydantic(AgentStatePydantic):

libs/prebuilt/langgraph/prebuilt/tool_node.py

@@ -124,7 +124,7 @@ class _ToolCallRequestOverrides(TypedDict, total=False):
 
 
 @dataclass
-class ToolCallRequest:
+class ToolCallRequest(Generic[ContextT, StateT]):
     """Tool execution request passed to tool call interceptors.
 
     Attributes:
@@ -133,18 +133,45 @@ class ToolCallRequest:
             registered with the `ToolNode`. When tool is `None`, interceptors can
             handle the request without validation. If the interceptor calls `execute()`,
             validation will occur and raise an error for unregistered tools.
-        state: Agent state (`dict`, `list`, or `BaseModel`).
         runtime: LangGraph runtime context (optional, `None` if outside graph).
+        state: Agent state (`dict`, `list`, or `BaseModel`). Pulled from `runtime.state`.
     """
 
     tool_call: ToolCall
     tool: BaseTool | None
-    state: Any
-    runtime: ToolRuntime
+    runtime: ToolRuntime[ContextT, StateT]
+
+    @property
+    def state(self) -> StateT:
+        """Get the state from the runtime.
+
+        Returns:
+            The current graph state from the runtime context.
+        """
+        return self.runtime.state
+
+    def __setattr__(self, name: str, value: Any) -> None:
+        """Raise deprecation warning when setting attributes directly.
+
+        Direct attribute assignment is deprecated. Use the `override()` method instead.
+        """
+        import warnings
+
+        # Allow setting attributes during initialization
+        if not hasattr(self, "__dataclass_fields__") or not hasattr(self, name):
+            object.__setattr__(self, name, value)
+        else:
+            warnings.warn(
+                f"Setting attribute '{name}' on ToolCallRequest is deprecated. "
+                "Use the override() method instead to create a new instance with modified values.",
+                DeprecationWarning,
+                stacklevel=2,
+            )
+            object.__setattr__(self, name, value)
 
     def override(
         self, **overrides: Unpack[_ToolCallRequestOverrides]
-    ) -> ToolCallRequest:
+    ) -> ToolCallRequest[ContextT, StateT]:
         """Replace the request with a new request with the given overrides.
 
         Returns a new `ToolCallRequest` instance with the specified attributes replaced.
@@ -202,8 +229,9 @@ Examples:
 
     ```python
     def handler(request, execute):
-        request.tool_call["args"]["value"] *= 2
-        return execute(request)
+        modified_call = {**request.tool_call, "args": {**request.tool_call["args"], "value": request.tool_call["args"]["value"] * 2}}
+        modified_request = request.override(tool_call=modified_call)
+        return execute(modified_request)
     ```
 
     Retry on error (execute multiple times):
@@ -927,11 +955,10 @@ class ToolNode(RunnableCallable):
         # to short-circuit requests for unregistered tools
         tool = self.tools_by_name.get(call["name"])
 
-        # Create the tool request with state and runtime
+        # Create the tool request with runtime
         tool_request = ToolCallRequest(
             tool_call=call,
             tool=tool,
-            state=tool_runtime.state,
             runtime=tool_runtime,
         )
 
@@ -1084,11 +1111,10 @@ class ToolNode(RunnableCallable):
         # to short-circuit requests for unregistered tools
         tool = self.tools_by_name.get(call["name"])
 
-        # Create the tool request with state and runtime
+        # Create the tool request with runtime
         tool_request = ToolCallRequest(
             tool_call=call,
             tool=tool,
-            state=tool_runtime.state,
             runtime=tool_runtime,
         )
 

libs/prebuilt/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph-prebuilt"
-version = "1.0.2"
+version = "1.0.4"
 description = "Library with high-level APIs for creating and executing LangGraph agents and tools."
 authors = []
 requires-python = ">=3.10"

libs/prebuilt/tests/test_on_tool_call.py

@@ -13,6 +13,7 @@ from langgraph.types import Command
 from langgraph.prebuilt.tool_node import (
     ToolCallRequest,
     ToolNode,
+    ToolRuntime,
 )
 
 pytestmark = pytest.mark.anyio
@@ -130,11 +131,17 @@ def test_modify_arguments() -> None:
         execute: Callable[[ToolCallRequest], ToolMessage | Command],
     ) -> ToolMessage | Command:
         """Handler that doubles the input arguments."""
-        # Modify the arguments
-        request.tool_call["args"]["a"] *= 2
-        request.tool_call["args"]["b"] *= 2
-
-        return execute(request)
+        # Modify the arguments using override method
+        modified_call = {
+            **request.tool_call,
+            "args": {
+                **request.tool_call["args"],
+                "a": request.tool_call["args"]["a"] * 2,
+                "b": request.tool_call["args"]["b"] * 2,
+            },
+        }
+        modified_request = request.override(tool_call=modified_call)
+        return execute(modified_request)
 
     tool_node = ToolNode([add], wrap_tool_call=modify_args_handler)
 
@@ -336,16 +343,23 @@ def test_tool_call_request_dataclass() -> None:
     """Test ToolCallRequest dataclass."""
     tool_call: ToolCall = {"name": "add", "args": {"a": 1, "b": 2}, "id": "call_1"}
     state: dict = {"messages": []}
-    runtime = None
+    tool_runtime = ToolRuntime(
+        state=state,
+        config={},
+        context=None,
+        store=None,
+        stream_writer=Mock(),
+        tool_call_id="call_1",
+    )
 
     request = ToolCallRequest(
-        tool_call=tool_call, tool=add, state=state, runtime=runtime
-    )  # type: ignore[arg-type]
+        tool_call=tool_call, tool=add, runtime=tool_runtime
+    )
 
     assert request.tool_call == tool_call
     assert request.tool == add
     assert request.state == state
-    assert request.runtime is None
+    assert request.runtime is tool_runtime
     assert request.tool_call["name"] == "add"
 
 
@@ -362,10 +376,17 @@ async def test_handler_with_async_execution() -> None:
         execute: Callable[[ToolCallRequest], ToolMessage | Command],
     ) -> ToolMessage | Command:
         """Handler that modifies arguments."""
-        # Add 10 to both arguments
-        request.tool_call["args"]["a"] += 10
-        request.tool_call["args"]["b"] += 10
-        return execute(request)
+        # Add 10 to both arguments using override method
+        modified_call = {
+            **request.tool_call,
+            "args": {
+                **request.tool_call["args"],
+                "a": request.tool_call["args"]["a"] + 10,
+                "b": request.tool_call["args"]["b"] + 10,
+            },
+        }
+        modified_request = request.override(tool_call=modified_call)
+        return execute(modified_request)
 
     tool_node = ToolNode([async_add], wrap_tool_call=modifying_handler)
 
@@ -1305,3 +1326,74 @@ async def test_state_extraction_with_tool_call_with_context_async() -> None:
     assert state_seen[0] == actual_state
     assert "__type" not in state_seen[0]
     assert "tool_call" not in state_seen[0]
+
+
+def test_tool_call_request_is_frozen() -> None:
+    """Test that ToolCallRequest raises deprecation warnings on direct attribute reassignment."""
+    tool_call: ToolCall = {"name": "add", "args": {"a": 1, "b": 2}, "id": "call_1"}
+    state: dict = {"messages": []}
+    tool_runtime = ToolRuntime(
+        state=state,
+        config={},
+        context=None,
+        store=None,
+        stream_writer=Mock(),
+        tool_call_id="call_1",
+    )
+
+    request = ToolCallRequest(
+        tool_call=tool_call, tool=add, runtime=tool_runtime
+    )
+
+    # Test that direct attribute reassignment raises DeprecationWarning
+    with pytest.warns(
+        DeprecationWarning,
+        match="Setting attribute 'tool_call' on ToolCallRequest is deprecated",
+    ):
+        request.tool_call = {"name": "other", "args": {}, "id": "call_2"}  # type: ignore[misc]
+
+    with pytest.warns(
+        DeprecationWarning,
+        match="Setting attribute 'tool' on ToolCallRequest is deprecated",
+    ):
+        request.tool = None  # type: ignore[misc]
+
+    # state is now a property, so setting it will raise a deprecation warning
+    # (and then fail with AttributeError after the warning)
+    with pytest.warns(
+        DeprecationWarning,
+        match="Setting attribute 'state' on ToolCallRequest is deprecated",
+    ):
+        with pytest.raises(AttributeError):
+            request.state = {}  # type: ignore[misc]
+
+    with pytest.warns(
+        DeprecationWarning,
+        match="Setting attribute 'runtime' on ToolCallRequest is deprecated",
+    ):
+        request.runtime = None  # type: ignore[misc]
+
+    # Test that override method works correctly
+    new_tool_call: ToolCall = {
+        "name": "multiply",
+        "args": {"x": 5, "y": 10},
+        "id": "call_3",
+    }
+
+    # Original request should be unchanged (note: it was modified by the warnings tests above)
+    # So we create a fresh request to test override properly
+    fresh_request = ToolCallRequest(
+        tool_call=tool_call, tool=add, runtime=tool_runtime
+    )
+    fresh_new_request = fresh_request.override(tool_call=new_tool_call)
+
+    # Original request should be unchanged
+    assert fresh_request.tool_call == tool_call
+    assert fresh_request.tool_call["name"] == "add"
+
+    # New request should have the updated tool_call
+    assert fresh_new_request.tool_call == new_tool_call
+    assert fresh_new_request.tool_call["name"] == "multiply"
+    assert fresh_new_request.tool == add  # Other fields should remain the same
+    assert fresh_new_request.state == state
+    assert fresh_new_request.runtime is tool_runtime

libs/prebuilt/tests/test_tool_node.py

@@ -1610,3 +1610,74 @@ def test_tool_node_stream_writer() -> None:
             },
         ),
     ]
+
+
+def test_tool_call_request_setattr_deprecation_warning():
+    """Test that ToolCallRequest raises a deprecation warning on direct attribute modification."""
+    import warnings
+    from unittest.mock import Mock
+
+    from langgraph.prebuilt.tool_node import ToolCallRequest, ToolRuntime
+
+    # Create a mock ToolCall
+    tool_call = {"name": "test", "args": {"a": 1}, "id": "call_1", "type": "tool_call"}
+
+    # Create a ToolRuntime
+    tool_runtime = ToolRuntime(
+        state={"messages": []},
+        config={},
+        context=None,
+        store=None,
+        stream_writer=Mock(),
+        tool_call_id="call_1",
+    )
+
+    # Create a ToolCallRequest
+    request = ToolCallRequest(
+        tool_call=tool_call,
+        tool=None,
+        runtime=tool_runtime,
+    )
+
+    # Test 1: Direct attribute assignment should raise deprecation warning but still work
+    with pytest.warns(DeprecationWarning, match="deprecated.*override"):
+        request.tool_call = {"name": "other", "args": {}, "id": "call_2"}
+
+    # Verify the attribute was actually modified
+    assert request.tool_call == {"name": "other", "args": {}, "id": "call_2"}
+
+    # Reset for further tests
+    with warnings.catch_warnings():
+        warnings.simplefilter("ignore")
+        request.tool_call = tool_call
+
+    # Test 2: override method should work without warnings
+    with warnings.catch_warnings(record=True) as w:
+        warnings.simplefilter("always")
+        new_tool_call = {
+            "name": "new_tool",
+            "args": {"b": 2},
+            "id": "call_3",
+            "type": "tool_call",
+        }
+        new_request = request.override(tool_call=new_tool_call)
+
+        # Verify no warning was raised
+        assert len(w) == 0
+
+    # Verify original is unchanged
+    assert request.tool_call == tool_call
+
+    # Verify new request has updated values
+    assert new_request.tool_call == new_tool_call
+
+    # Test 3: Initialization should not trigger warning
+    with warnings.catch_warnings(record=True) as w:
+        warnings.simplefilter("always")
+        ToolCallRequest(
+            tool_call=tool_call,
+            tool=None,
+            runtime=tool_runtime,
+        )
+        # Verify no warning was raised during initialization
+        assert len(w) == 0

libs/prebuilt/uv.lock

@@ -1,5 +1,5 @@
 version = 1
-revision = 3
+revision = 2
 requires-python = ">=3.10"
 
 [[package]]
@@ -246,7 +246,7 @@ wheels = [
 
 [[package]]
 name = "langgraph"
-version = "1.0.2"
+version = "1.0.3"
 source = { editable = "../langgraph" }
 dependencies = [
     { name = "langchain-core" },
@@ -467,7 +467,7 @@ test = [
 
 [[package]]
 name = "langgraph-prebuilt"
-version = "1.0.2"
+version = "1.0.4"
 source = { editable = "." }
 dependencies = [
     { name = "langchain-core" },