release(cli): 0.4.37 (#9351 )

Bumps the CLI to 0.4.37 to cut a release including #9333 (`langgraph deploy` defaults to serverless) and #9350 (`--verbose` no longer prints subprocess stdin), the two CLI changes merged since 0.4.36. Merging doesn't publish by itself: after it merges, run the `release` workflow with `working-directory: libs/cli`.
fix(cli): stop printing subprocess stdin in verbose output (#9350 )
2026-10-21 15:31:43 +02:00 · 2026-10-19 10:03:29 -04:00 · 2026-10-19 13:45:42 +00:00 · 2026-10-19 21:47:25 +09:00 · 2026-10-18 15:18:50 -04:00 · 2026-10-17 18:27:10 -07:00
35 changed files with 1972 additions and 729 deletions
@@ -21,8 +21,8 @@
    "test:all": "yarn test && yarn test:int && yarn lint:langgraph"
  },
  "dependencies": {
-    "@langchain/core": "^1.2.9",
-    "@langchain/langgraph": "^1.4.13"
+    "@langchain/core": "^1.2.13",
+    "@langchain/langgraph": "^1.4.18"
  },
  "resolutions": {
    "@langchain/langgraph-checkpoint": "1.0.4",
@@ -30,21 +30,21 @@
    "@eslint/eslintrc/js-yaml": "4.3.2"
  },
  "devDependencies": {
-    "@eslint/eslintrc": "^3.3.6",
+    "@eslint/eslintrc": "^3.3.7",
    "@eslint/js": "^10.0.1",
    "@tsconfig/recommended": "^1.0.13",
    "@types/jest": "^30.0.0",
-    "@typescript-eslint/eslint-plugin": "^8.68.0",
-    "@typescript-eslint/parser": "^8.68.0",
-    "dotenv": "^17.4.2",
-    "eslint": "^10.9.1",
+    "@typescript-eslint/eslint-plugin": "^8.70.1",
+    "@typescript-eslint/parser": "^8.70.1",
+    "dotenv": "^18.0.4",
+    "eslint": "^10.11.0",
    "eslint-config-prettier": "^10.1.8",
    "eslint-plugin-import": "^2.32.0",
    "eslint-plugin-no-instanceof": "^1.0.1",
    "eslint-plugin-prettier": "^5.5.6",
-    "jest": "^30.5.0",
-    "prettier": "^3.9.6",
-    "ts-jest": "^29.4.12",
+    "jest": "^30.5.2",
+    "prettier": "^3.9.9",
+    "ts-jest": "^29.4.14",
    "typescript": "^7.0.2"
  }
 }
@@ -589,9 +589,9 @@ brace-expansion@^1.1.7:
    concat-map "0.0.1"

 brace-expansion@^5.0.8:
-  version "5.0.9"
-  resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-5.0.9.tgz#7c72438809b5fa5babf54199a1f1c281a6984fcf"
-  integrity sha512-ScQ4IuvIEF1TMlP7Zt+vjJ//9zlPb2SDcxWxM3bk8s6t6GGdJ7KO1dCcTidOPJKePW30LE/2cT7wCyPho9/Wxg==
+  version "5.0.12"
+  resolved "https://registry.npmjs.org/brace-expansion/-/brace-expansion-5.0.12.tgz#995fbb4750a77c4d16a7dc942ff2ca6ef8e675ec"
+  integrity sha512-YovQ3rzhaLMIrDjNDMkNS01tea93qhEhG5xy8f6+R0l+dw3Ki+5sCoIoI942iuLZTHWogWktgwVDhU09iNEimQ==
  dependencies:
    balanced-match "^4.0.2"

@@ -1 +1 @@
-__version__ = "0.4.35"
+__version__ = "0.4.37"
@@ -1209,6 +1209,33 @@ class DockerBuildCommand:
        return cls(("docker", "buildx", "build"), flags)


+def _active_docker_host(runner: CommandRunner) -> str | None:
+    """Return the daemon endpoint of the user's active Docker context.
+
+    None when `DOCKER_HOST` is set, which Docker honors with any config
+    directory. Also None when the lookup fails (for example, `DOCKER_CONTEXT`
+    names a context that doesn't exist) or the context has no Docker endpoint
+    (Docker prints `<no value>`); that keeps Docker's own default in place.
+    """
+    if os.environ.get("DOCKER_HOST"):
+        return None
+    try:
+        stdout, _ = runner.run(
+            subp_exec(
+                "docker",
+                "context",
+                "inspect",
+                "--format",
+                "{{.Endpoints.docker.Host}}",
+                collect=True,
+            )
+        )
+    except (click.exceptions.Exit, OSError):
+        return None
+    host = (stdout or "").strip()
+    return host if "://" in host else None
+
+
 def _docker_argv(docker_config_dir: str | None) -> tuple[str, ...]:
    if docker_config_dir is None:
        return ("docker",)
@@ -1242,17 +1269,13 @@ def _push_image(
    runner: CommandRunner,
    image: str,
    *,
-    docker_config_dir: str | None,
+    docker: tuple[str, ...],
    verbose: bool,
 ) -> None:
    for attempt in range(1, _PUSH_ATTEMPTS + 1):
        try:
            with Progress(message="Pushing...", elapsed=not verbose):
-                runner.run(
-                    subp_exec(
-                        *_docker_argv(docker_config_dir), "push", image, verbose=verbose
-                    )
-                )
+                runner.run(subp_exec(*docker, "push", image, verbose=verbose))
            return
        except click.exceptions.Exit:
            if attempt == _PUSH_ATTEMPTS:
@@ -1337,6 +1360,11 @@ def _run_local_build(
        registry_host = repository.split("/")[0]

        with _docker_config_for_token(registry_host, deployment_token, username) as cfg:
+            # A config directory has no current context, so Docker would fall
+            # back to /var/run/docker.sock; keep using the daemon the build used.
+            docker_host = _active_docker_host(runner)
+            host_args = ("--host", docker_host) if docker_host else ()
+            docker = (*_docker_argv(cfg), *host_args)
            _log_deploy_step(step, f"Logging into {registry_host}")
            token_input = (
                deployment_token
@@ -1345,7 +1373,7 @@ def _run_local_build(
            )
            runner.run(
                subp_exec(
-                    *_docker_argv(cfg),
+                    *docker,
                    "login",
                    "-u",
                    username,
@@ -1361,7 +1389,7 @@ def _run_local_build(
            runner.run(
                subp_exec("docker", "tag", image_to_push, remote_image, verbose=verbose)
            )
-            _push_image(runner, remote_image, docker_config_dir=cfg, verbose=verbose)
+            _push_image(runner, remote_image, docker=docker, verbose=verbose)
        step += 1

        resolved_image = _resolve_pushed_image_digest(
@@ -1532,6 +1560,14 @@ def _resolve_or_create(
            secrets=ctx.secrets,
        )
    except HostBackendError as err:
+        if err.status_code == 400 and err.detail == (
+            "Scale to zero deployments are not supported in AWS environments"
+        ):
+            raise HostBackendError(
+                f"{err.message}\nUse --deployment-type dev instead.",
+                status_code=err.status_code,
+                detail=err.detail,
+            ) from None
        if _needs_a_listener(err):
            raise ListenerRequiredError(
                "The image has to come from a registry you manage, so re-run with "
@@ -1826,7 +1862,7 @@ class CustomerRegistrySource:
                _build_image(runner, ctx.spec, image, verbose=ctx.verbose)
            step += 1
            _log_deploy_step(step, f"Pushing image {image}")
-            _push_image(runner, image, docker_config_dir=None, verbose=ctx.verbose)
+            _push_image(runner, image, docker=_docker_argv(None), verbose=ctx.verbose)
            step += 1
            digest = _resolve_pushed_image_digest(
                runner, remote_image=image, docker_config_dir=None, verbose=ctx.verbose
@@ -2185,11 +2221,13 @@ def _deploy_base_options(
            ),
            click.option(
                "--deployment-type",
-                type=click.Choice(["dev", "prod"]),
-                default="dev",
+                type=click.Choice(["serverless", "dedicated", "dev", "prod"]),
+                default="serverless",
                show_default=True,
                help=(
-                    "Deployment type (used when creating a new deployment). "
+                    "Deployment type (used when creating a new deployment): "
+                    "serverless (scale to zero) or dedicated (prod); "
+                    "legacy dev and prod are also accepted. "
                    "Ignored with --push-to."
                ),
            ),
@@ -2480,7 +2518,9 @@ def _deploy_cmd(
            ),
            verbose=verbose,
            selector=selector,
-            deployment_type=deployment_type,
+            deployment_type={"serverless": "dev_zero", "dedicated": "prod"}.get(
+                deployment_type, deployment_type
+            ),
            secrets=secrets,
            tracked_packages=tracked_packages,
        )
@@ -44,11 +44,8 @@ async def subp_exec(
    on_stdout: Callable[[str], bool | None] | None = None,
 ) -> tuple[str | None, str | None]:
    if verbose:
-        cmd_str = f"+ {cmd} {' '.join(map(str, args))}"
-        if input:
-            print(cmd_str, " <\n", "\n".join(filter(None, input.splitlines())), sep="")
-        else:
-            print(cmd_str)
+        # Never echo stdin: it can carry secrets (docker login --password-stdin).
+        print(f"+ {cmd} {' '.join(map(str, args))}")
    if wait:
        await asyncio.sleep(wait)

@@ -52,6 +52,8 @@ ARCHIVE = ("/tmp/src.tgz", 2048, "langgraph.json")
 OBJECT_PATH = "tarballs/src.tgz"
 PLATFORM_FORMAT = "{{.Os}}/{{.Architecture}}"
 DIGESTS_FORMAT = "{{json .RepoDigests}}"
+CONTEXT_HOST_FORMAT = "{{.Endpoints.docker.Host}}"
+CONTEXT_HOST = "unix:///Users/dev/.docker/run/docker.sock"
 NOT_A_CLI_DEPLOYMENT = (
    "push token is only available for 'internal_docker' source deployments"
 )
@@ -192,6 +194,8 @@ class DockerCommand:
 class DockerDouble:
    timeline: list[str]
    failing_pushes: int = 0
+    context_lookup_fails: bool = False
+    context_host: str = CONTEXT_HOST
    builds: list[dict] = field(default_factory=list)
    commands: list[DockerCommand] = field(default_factory=list)

@@ -235,6 +239,10 @@ class DockerDouble:
        if "push" in args and self.failing_pushes > 0:
            self.failing_pushes -= 1
            raise click.exceptions.Exit(1)
+        if CONTEXT_HOST_FORMAT in args:
+            if self.context_lookup_fails:
+                raise click.exceptions.Exit(1)
+            return f"{self.context_host}\n", None
        if PLATFORM_FORMAT in args:
            return "linux/amd64\n", None
        if DIGESTS_FORMAT in args:
@@ -244,6 +252,8 @@ class DockerDouble:

    @staticmethod
    def _verb(args: tuple[str, ...]) -> str:
+        if CONTEXT_HOST_FORMAT in args:
+            return "inspect-context"
        if PLATFORM_FORMAT in args:
            return "inspect-platform"
        if DIGESTS_FORMAT in args:
@@ -292,7 +302,12 @@ def deploy_project(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> DeployPro
        json.dumps({"graphs": {"agent": "agent.py:graph"}, "dependencies": ["."]})
    )
    monkeypatch.chdir(tmp_path)
-    for name in ("LANGSMITH_TENANT_ID", "LANGSMITH_ENDPOINT", "LANGGRAPH_HOST_URL"):
+    for name in (
+        "LANGSMITH_TENANT_ID",
+        "LANGSMITH_ENDPOINT",
+        "LANGGRAPH_HOST_URL",
+        "DOCKER_HOST",
+    ):
        monkeypatch.delenv(name, raising=False)

    timeline: list[str] = []
@@ -329,6 +344,44 @@ def deploy_project(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> DeployPro
    return DeployProject(control_plane, docker, timeline, uploads)


+@pytest.mark.parametrize("build_mode", ["--no-remote", "--remote"])
+@pytest.mark.parametrize(
+    ("detail", "expects_dev_hint"),
+    [
+        ("Scale to zero deployments are not supported in AWS environments", True),
+        ("No eligible cluster is currently available to host this deployment.", False),
+    ],
+)
+def test_create_failure_preserves_backend_error_and_only_hints_for_aws_rejection(
+    deploy_project: DeployProject, build_mode: str, detail: str, expects_dev_hint: bool
+) -> None:
+    deploy_project.control_plane.create_error = detail
+
+    result = deploy_project.run(build_mode)
+
+    assert result.exit_code == 1, result.output
+    assert detail in result.output
+    assert ("Use --deployment-type dev instead." in result.output) is expects_dev_hint
+    assert deploy_project.control_plane.bodies[CREATE_DEPLOYMENT]["source_config"] == {
+        "deployment_type": "dev_zero"
+    }
+    assert deploy_project.timeline == [LIST_DEPLOYMENTS, CREATE_DEPLOYMENT]
+
+
+@pytest.mark.parametrize("build_mode", ["--no-remote", "--remote"])
+def test_aws_serverless_creation_succeeds_when_backend_accepts_it(
+    deploy_project: DeployProject, build_mode: str
+) -> None:
+    result = deploy_project.run(
+        build_mode, host_url="https://aws.api.host.langchain.com"
+    )
+
+    assert result.exit_code == 0, result.output
+    assert deploy_project.control_plane.bodies[CREATE_DEPLOYMENT]["source_config"] == {
+        "deployment_type": "dev_zero"
+    }
+
+
 def test_first_local_deploy_creates_then_builds_pushes_and_updates_in_order(
    deploy_project: DeployProject,
 ) -> None:
@@ -340,6 +393,7 @@ def test_first_local_deploy_creates_then_builds_pushes_and_updates_in_order(
        CREATE_DEPLOYMENT,
        "docker build",
        _push_token(CREATED_ID),
+        "docker inspect-context",
        "docker login",
        "docker tag",
        "docker push",
@@ -349,15 +403,41 @@ def test_first_local_deploy_creates_then_builds_pushes_and_updates_in_order(
    assert "Deployment updated" in result.output


-def test_first_local_deploy_creates_an_internal_docker_deployment(
-    deploy_project: DeployProject,
+@pytest.mark.parametrize(
+    ("deployment_type", "wire_type"),
+    [
+        ("serverless", "dev_zero"),
+        ("dedicated", "prod"),
+        ("dev", "dev"),
+        ("prod", "prod"),
+    ],
+)
+@pytest.mark.parametrize("build_mode", ["--no-remote", "--remote"])
+def test_deployment_type_aliases(
+    deploy_project: DeployProject, deployment_type: str, wire_type: str, build_mode: str
 ) -> None:
-    deploy_project.run("--no-remote")
+    result = deploy_project.run(build_mode, "--deployment-type", deployment_type)

+    assert result.exit_code == 0, result.output
+    assert deploy_project.control_plane.bodies[CREATE_DEPLOYMENT]["source_config"] == {
+        "deployment_type": wire_type
+    }
+
+
+@pytest.mark.parametrize(
+    ("build_mode", "source"),
+    [("--no-remote", "internal_docker"), ("--remote", "internal_source")],
+)
+def test_first_deploy_defaults_to_serverless(
+    deploy_project: DeployProject, build_mode: str, source: str
+) -> None:
+    result = deploy_project.run(build_mode)
+
+    assert result.exit_code == 0, result.output
    assert deploy_project.control_plane.bodies[CREATE_DEPLOYMENT] == {
        "name": "my-app",
-        "source": "internal_docker",
-        "source_config": {"deployment_type": "dev"},
+        "source": source,
+        "source_config": {"deployment_type": "dev_zero"},
        "source_revision_config": {},
        "secrets": [],
    }
@@ -406,7 +486,7 @@ def test_local_deploy_logs_in_with_the_control_plane_push_token(

    login = deploy_project.docker.command("login")
    assert login.args[:2] == ("docker", "--config")
-    assert login.args[3:] == (
+    assert login.args[-5:] == (
        "login",
        "-u",
        "oauth2accesstoken",
@@ -416,6 +496,53 @@ def test_local_deploy_logs_in_with_the_control_plane_push_token(
    assert login.kwargs["input"] == f"{PUSH_TOKEN}\n"


+def test_local_deploy_logs_in_and_pushes_through_the_active_docker_context(
+    deploy_project: DeployProject,
+) -> None:
+    """The temporary config has no current context, so without the active
+    context's endpoint Docker would push through /var/run/docker.sock."""
+    result = deploy_project.run("--no-remote")
+
+    assert result.exit_code == 0, result.output
+    for verb in ("login", "push"):
+        args = deploy_project.docker.command(verb).args
+        assert args[3:5] == ("--host", CONTEXT_HOST), verb
+
+
+def test_local_deploy_leaves_an_explicit_docker_host_to_docker(
+    deploy_project: DeployProject, monkeypatch: pytest.MonkeyPatch
+) -> None:
+    monkeypatch.setenv("DOCKER_HOST", "tcp://127.0.0.1:2375")
+
+    result = deploy_project.run("--no-remote")
+
+    assert result.exit_code == 0, result.output
+    for verb in ("login", "push"):
+        assert "--host" not in deploy_project.docker.command(verb).args, verb
+
+
+def test_local_deploy_keeps_dockers_default_when_the_context_lookup_fails(
+    deploy_project: DeployProject,
+) -> None:
+    deploy_project.docker.context_lookup_fails = True
+
+    result = deploy_project.run("--no-remote")
+
+    assert result.exit_code == 0, result.output
+    assert "--host" not in deploy_project.docker.command("push").args
+
+
+def test_local_deploy_ignores_a_context_without_a_docker_endpoint(
+    deploy_project: DeployProject,
+) -> None:
+    deploy_project.docker.context_host = "<no value>"
+
+    result = deploy_project.run("--no-remote")
+
+    assert result.exit_code == 0, result.output
+    assert "--host" not in deploy_project.docker.command("push").args
+
+
 def test_local_deploy_tells_the_control_plane_it_honors_registry_usernames(
    deploy_project: DeployProject,
 ) -> None:
@@ -438,7 +565,7 @@ def test_local_deploy_logs_in_with_the_username_the_control_plane_returns(
    deploy_project.run("--no-remote")

    login = deploy_project.docker.command("login")
-    assert login.args[3:] == (
+    assert login.args[-5:] == (
        "login",
        "-u",
        "AWS",
@@ -506,6 +633,7 @@ def test_prebuilt_image_is_validated_and_pushed_without_a_build(
    assert deploy_project.docker.builds == []
    assert deploy_project.docker.verbs() == [
        "docker inspect-platform",
+        "docker inspect-context",
        "docker login",
        "docker tag",
        "docker push",
@@ -0,0 +1,17 @@
+import sys
+
+from langgraph_cli.exec import subp_exec
+
+
+async def test_verbose_prints_command_but_not_stdin(capsys):
+    await subp_exec(
+        sys.executable,
+        "-c",
+        "import sys; sys.stdin.read()",
+        input="registry-push-token\n",
+        verbose=True,
+    )
+
+    out = capsys.readouterr().out
+    assert out.startswith(f"+ {sys.executable} -c"), out
+    assert "registry-push-token" not in out, out
@@ -43,14 +43,31 @@ start-services:
 stop-services:
 	docker compose -f tests/compose-postgres.yml -f tests/compose-redis.yml down -v

+DEV_SERVER_PYTHON ?= 3.12
+DEV_SERVER_ENV = $(CURDIR)/.venvs/dev-server
+
 start-dev-server:
-	LOG_LEVEL=warning uv run langgraph dev --config tests/example_app/langgraph.json --no-browser & echo "$$!" > .devserver.pid
-	@echo "Dev server started."
+	uv sync --frozen --group test --no-dev
+	UV_PROJECT_ENVIRONMENT=$(DEV_SERVER_ENV) uv sync --frozen --group test --no-dev --python $(DEV_SERVER_PYTHON)
+	@LOG_LEVEL=warning UV_PROJECT_ENVIRONMENT=$(DEV_SERVER_ENV) uv run --no-sync --python $(DEV_SERVER_PYTHON) langgraph dev --config tests/example_app/langgraph.json --no-browser --no-reload & \
+	PID=$$!; echo "$$PID" > .devserver.pid; \
+	for ATTEMPT in $$(seq 1 60); do \
+		if ! kill -0 $$PID 2>/dev/null; then break; fi; \
+		if curl --fail --silent --max-time 1 http://localhost:2024/ok >/dev/null; then \
+			echo "Dev server ready."; exit 0; \
+		fi; \
+		sleep 1; \
+	done; \
+	echo "Dev server failed to become ready." >&2; \
+	kill $$PID 2>/dev/null || true; \
+	wait $$PID 2>/dev/null || true; \
+	rm -f .devserver.pid; exit 1

 stop-dev-server:
 	@if [ -f .devserver.pid ]; then \
-		kill `cat .devserver.pid` && rm .devserver.pid; \
-		 echo "Dev server stopped."; \
+		kill $$(cat .devserver.pid) 2>/dev/null || true; \
+		rm -f .devserver.pid; \
+		echo "Dev server stopped."; \
 	else \
 		echo "No dev server PID file found."; \
 	fi
@@ -60,13 +77,12 @@ NO_DOCKER ?= $(sh command -v docker >/dev/null 2>&1 && echo "false" || echo "tru

 test:
 	if [ "$(NO_DOCKER)" = "false" ]; then \
-		make start-services &&\
-		make start-dev-server &&\
-		uv run pytest $(TEST); \
-		EXIT_CODE=$$?; \
-		make stop-services; \
-		make stop-dev-server; \
-		exit $$EXIT_CODE; \
+		trap '$(MAKE) stop-dev-server; $(MAKE) stop-services' EXIT; \
+		trap 'exit 130' INT; trap 'exit 143' TERM; \
+		$(MAKE) start-services &&\
+		$(MAKE) start-dev-server &&\
+		uv run --no-sync pytest $(TEST); \
+		exit $$?; \
 	else \
 		NO_DOCKER=true uv run pytest $(TEST) ; \
 		EXIT_CODE=$$?; \
@@ -74,13 +90,12 @@ test:
 	fi

 test_parallel:
-	make start-services &&\
-	make start-dev-server &&\
-	uv run pytest -n auto --dist worksteal $(TEST) -vv --lf; \
-	EXIT_CODE=$$?; \
-	make stop-services; \
-	make stop-dev-server; \
-	exit $$EXIT_CODE
+	trap '$(MAKE) stop-dev-server; $(MAKE) stop-services' EXIT; \
+	trap 'exit 130' INT; trap 'exit 143' TERM; \
+	$(MAKE) start-services &&\
+	$(MAKE) start-dev-server &&\
+	uv run --no-sync pytest -n auto --dist worksteal $(TEST) -vv --lf; \
+	exit $$?

 integration_tests:
 	uv run pytest integration_tests
@@ -257,8 +257,10 @@ class PregelLoop:
    _resume_loaded_writes: Sequence[PendingWrite] = ()
    # Tasks `_reapply_writes_to_succeeded_nodes` handed loaded writes back to.
    _reapplied_task_ids: set[str]
-    # An update or fork checkpoint addressed by `checkpoint_id` that the thread
-    # has moved past, so it may already have children.
+    # Tasks that wrote during this run, the only ones exit mode saves at exit.
+    _written_task_ids: set[str]
+    # A checkpoint addressed by `checkpoint_id` that the thread has moved past,
+    # so it may already have children.
    _addressed_checkpoint_superseded: bool = False

    # The checkpoint_config that points at the parent loaded at `__enter__`
@@ -349,7 +351,6 @@ class PregelLoop:
        self.interrupt_before = interrupt_before
        self.manager = manager
        self.is_nested = CONFIG_KEY_TASK_ID in self.config.get(CONF, {})
-        self.is_replaying = CONFIG_KEY_CHECKPOINT_ID in config[CONF]
        self._migrate_checkpoint = migrate_checkpoint
        self.trigger_to_nodes = trigger_to_nodes
        self.retry_policy = retry_policy
@@ -407,6 +408,14 @@ class PregelLoop:
            else ()
        )
        self.prev_checkpoint_config = None
+        # Whether the run points this loop at a checkpoint: a truthy
+        # `checkpoint_id`, this graph's `checkpoint_map` entry, or a replaying
+        # parent. Every task config carries `checkpoint_id: None`, so a key
+        # check would count every subgraph.
+        self._addressed = bool(
+            self.checkpoint_config[CONF].get(CONFIG_KEY_CHECKPOINT_ID)
+            or self.config[CONF].get(CONFIG_KEY_REPLAY_STATE)
+        )
        runtime = self.config[CONF].get(CONFIG_KEY_RUNTIME)
        self.control = runtime.control if isinstance(runtime, Runtime) else None

@@ -455,6 +464,7 @@ class PregelLoop:
        """Put writes for a task, to be read by the next tick."""
        if not writes:
            return
+        self._written_task_ids.add(task_id)
        # deduplicate writes to special channels, last write wins
        if all(w[0] in WRITES_IDX_MAP for w in writes):
            writes = list({w[0]: w for w in writes}.values())
@@ -468,6 +478,11 @@ class PregelLoop:
                for w in self.checkpoint_pending_writes
                if w[0] != task_id or w[1] not in WRITES_IDX_MAP
            ]
+            # Savers key a regular write by its position in the list, and the
+            # special ones dropped above won't be there next time, so they go
+            # last: a resume saved ahead of an update would move it to a new
+            # slot once the list is saved again, and it would apply twice.
+            writes = sorted(writes, key=lambda w: w[0] in WRITES_IDX_MAP)
            writes_to_save: WritesT = [
                w[1:] for w in self.checkpoint_pending_writes if w[0] == task_id
            ] + list(writes)
@@ -556,10 +571,12 @@ class PregelLoop:
                CONFIG_KEY_CHECKPOINT_ID: self.checkpoint["id"],
            },
        )
-        # group by task id
+        # Writes loaded with the checkpoint are stored on it already. Saving them
+        # again can file them under new indexes, and then they apply twice.
        by_task = defaultdict(list)
        for task_id, channel, value in self.checkpoint_pending_writes:
-            by_task[task_id].append((channel, value))
+            if task_id in self._written_task_ids:
+                by_task[task_id].append((channel, value))
        # submit writes to checkpointer
        for task_id, writes in by_task.items():
            if self.checkpointer_put_writes_accepts_task_path and hasattr(
@@ -904,6 +921,7 @@ class PregelLoop:
            if tid != NULL_TASK_ID and isinstance(self.specs.get(ch), DeltaChannel)
        }
        self._exit_command_writes = []
+        self._written_task_ids = set()
        # Resuming from a previous checkpoint requires two things:
        # 1. A prior checkpoint exists (channel_versions is non-empty)
        # 2. The input signals continuation (not a fresh run with new input)
@@ -931,7 +949,7 @@ class PregelLoop:
        # writes so that interrupt() calls re-fire instead of returning
        # stale values. But if we're actively resuming, keep them —
        # multi-interrupt scenarios need previously resolved values preserved.
-        is_time_traveling = self.is_replaying and (
+        is_time_traveling = self._addressed and (
            # Time-travel to a subgraph checkpoint: the parent sets
            # RESUMING=True (it can't distinguish time-travel from resume),
            # so we check if this subgraph's own ns is in checkpoint_map.
@@ -950,6 +968,10 @@ class PregelLoop:
                or configurable.get(CONFIG_KEY_RESUMING, False)
            )
        )
+        # Finished tasks rerun only on time travel, or on a resume at a
+        # checkpoint the thread has moved past. A resume addressed at the
+        # thread's latest checkpoint hands their writes back, as without an id.
+        self.is_replaying = is_time_traveling or self._addressed_checkpoint_superseded
        if is_time_traveling:
            self.checkpoint_pending_writes = [
                w for w in self.checkpoint_pending_writes if w[1] != RESUME
@@ -1165,11 +1187,11 @@ class PregelLoop:
            # checkpoint ID since the fork was created after the subgraph's
            # checkpoints from the original execution.
            #
-            # Only gate on is_time_traveling (not is_replaying). When the
+            # Only gate on is_time_traveling (not _addressed). When the
            # client resumes with an explicit checkpoint_id that happens to
            # point at the current head (e.g. LangGraph Studio sending
            # `checkpoint: {checkpoint_id}` alongside Command(resume=...)),
-            # is_replaying is True but is_time_traveling is False. In that
+            # the run is addressed but not time traveling. In that
            # case subgraphs should load their latest checkpoint normally,
            # not go through ReplayState's before-bound lookup which would
            # miss subgraph checkpoints created during processing of the
@@ -1789,7 +1811,7 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
            # This covers both normal replay and subgraphs resolved via
            # checkpoint_map during time-travel.
            saved = self.checkpointer.get_tuple(self.checkpoint_config)
-            if saved is not None and saved.metadata.get("source") in ("update", "fork"):
+            if saved is not None:
                self._addressed_checkpoint_superseded = checkpoint_superseded(
                    self.checkpointer, self.checkpoint_config, saved
                )
@@ -2045,7 +2067,7 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
            # This covers both normal replay and subgraphs resolved via
            # checkpoint_map during time-travel.
            saved = await self.checkpointer.aget_tuple(self.checkpoint_config)
-            if saved is not None and saved.metadata.get("source") in ("update", "fork"):
+            if saved is not None:
                self._addressed_checkpoint_superseded = await acheckpoint_superseded(
                    self.checkpointer, self.checkpoint_config, saved
                )
@@ -41,7 +41,7 @@ from langgraph._internal._future import chain_future, run_coroutine_threadsafe
 from langgraph._internal._scratchpad import PregelScratchpad
 from langgraph._internal._typing import MISSING
 from langgraph.constants import TAG_HIDDEN
-from langgraph.errors import GraphBubbleUp, GraphInterrupt
+from langgraph.errors import GraphBubbleUp, GraphInterrupt, is_invalid_resume
 from langgraph.pregel._algo import Call
 from langgraph.pregel._executor import Submit
 from langgraph.pregel._retry import arun_with_retry, run_with_retry
@@ -621,7 +621,11 @@ def _should_stop_others(
    handled_exception_ids: set[int] | None = None,
 ) -> bool:
    """Check if any task failed, if so, cancel all other tasks.
-    GraphInterrupts are not considered failures."""
+    GraphInterrupts are not considered failures.
+
+    Neither is an invalid resume value: it's raised once the other tasks finish, so a
+    task answered in the same resume isn't cut off after its side effects and then run
+    again with its saved answer."""
    for fut in done:
        if fut.cancelled():
            continue
@@ -629,6 +633,7 @@ def _should_stop_others(
            if (
                id(exc) not in (handled_exception_ids or set())
                and not isinstance(exc, GraphBubbleUp)
+                and not is_invalid_resume(exc)
                and fut not in SKIP_RERAISE_SET
            ):
                return True
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"

 [project]
 name = "langgraph"
-version = "1.2.15"
+version = "1.2.16"
 description = "Building stateful, multi-actor applications with LLMs"
 authors = []
 requires-python = ">=3.10"
@@ -521,10 +521,11 @@ def test_addressed_resume_keeps_a_rerun_tasks_write_to_a_new_channel(
    graph = builder.compile(checkpointer=sync_checkpointer)
    config = {"configurable": {"thread_id": "t"}}
    graph.invoke(_both("in"), config, durability=durability)
-    head = graph.get_state(config).config
+    paused = graph.get_state(config).config
+    graph.update_state(config, None)

    live = graph.invoke(
-        Command(resume="yes", update={"flag": True}), head, durability=durability
+        Command(resume="yes", update={"flag": True}), paused, durability=durability
    )

    state = graph.get_state(config)
@@ -152,6 +152,83 @@ def test_finished_task_does_not_report_answered_interrupt(
        assert asked == [["A1", "B"]]


+def test_finished_task_output_applies_once(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    builder = StateGraph(State)
+    builder.add_node("a", lambda s: {"log": [f"a:{interrupt('A')}"]})
+    builder.add_node("b", lambda s: {"log": [f"b:{interrupt('B')}"]})
+    builder.add_node("c", lambda s: {"log": [f"c:{interrupt('C')}"]})
+    builder.add_edge(START, "a")
+    builder.add_edge(START, "b")
+    builder.add_edge(START, "c")
+    graph = builder.compile(checkpointer=sync_checkpointer)
+    config = _config()
+
+    result = graph.invoke({"log": []}, config, durability=durability)
+    while pending := result.get("__interrupt__"):
+        result = graph.invoke(
+            Command(resume={pending[0].id: "yes"}), config, durability=durability
+        )
+
+    assert sorted(result["log"]) == ["a:yes", "b:yes", "c:yes"]
+
+
+def test_resume_with_update_applies_the_update_once(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    def ask_three_times(state: State) -> State:
+        answers = [interrupt(str(question)) for question in range(1, 4)]
+        return {"log": ["a:" + "".join(answers)]}
+
+    graph = (
+        StateGraph(State)
+        .add_node("a", ask_three_times)
+        .add_edge(START, "a")
+        .compile(checkpointer=sync_checkpointer)
+    )
+    config = _config()
+
+    result = graph.invoke({"log": []}, config, durability=durability)
+    for i in range(1, 4):
+        result = graph.invoke(
+            Command(resume=str(i), update={"log": [f"u{i}"]}),
+            config,
+            durability=durability,
+        )
+
+    assert sorted(result["log"]) == ["a:123", "u1", "u2", "u3"]
+    assert sorted(graph.get_state(config).values["log"]) == sorted(result["log"])
+
+
+@pytest.mark.parametrize("checkpoint_id", ["none", "head"])
+def test_resume_at_the_latest_checkpoint_does_not_rerun_finished_task(
+    sync_checkpointer: BaseCheckpointSaver, checkpoint_id: str
+) -> None:
+    calls: Counter[str] = Counter()
+    graph = _build_parallel(sync_checkpointer, calls)
+    config = _config()
+    graph.invoke({"log": []}, config)
+
+    def resume(question: str, answer: str) -> Any:
+        snapshot = graph.get_state(config)
+        target = (
+            snapshot.config
+            if checkpoint_id == "head"
+            else {"configurable": {**config["configurable"], "checkpoint_id": None}}
+        )
+        return graph.invoke(
+            Command(resume={_interrupt_by_value(snapshot, question).id: answer}),
+            target,
+        )
+
+    resume("A1", "yes")
+    result = resume("B", "ok")
+
+    assert sorted(result["log"]) == ["a:yes", "b:ok"]
+    assert calls == {"a": 2, "b": 3}, "resuming B ran the finished A again"
+
+
@NEEDS_CONTEXTVARS
 async def test_finished_task_does_not_report_answered_interrupt_async(
    async_checkpointer: BaseCheckpointSaver,
@@ -474,6 +551,64 @@ def test_functional_task_finished_with_none_is_not_rerun(
    assert calls == {"a": 2, "b": 3}


+def test_subgraph_finished_task_is_not_rerun(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    calls: Counter[str] = Counter()
+    builder = StateGraph(State)
+    builder.add_node("child", _build_parallel(None, calls))
+    builder.add_edge(START, "child")
+    graph = builder.compile(checkpointer=sync_checkpointer)
+    config = _config()
+
+    graph.invoke({"log": []}, config, durability=durability)
+    snapshot = graph.get_state(config)
+    graph.invoke(
+        Command(resume={_interrupt_by_value(snapshot, "A1").id: "yes"}),
+        config,
+        durability=durability,
+    )
+    snapshot = graph.get_state(config)
+    result = graph.invoke(
+        Command(resume={_interrupt_by_value(snapshot, "B").id: "ok"}),
+        config,
+        durability=durability,
+    )
+
+    assert sorted(result["log"]) == ["a:yes", "b:ok"]
+    assert calls == {"a": 2, "b": 3}, "resuming B ran the finished A again"
+
+
+def test_nested_entrypoint_finished_task_is_not_rerun(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    calls: Counter[str] = Counter()
+
+    @task
+    def step_1(query: str) -> str:
+        calls["step_1"] += 1
+        return f"{query} bar"
+
+    @task
+    def human_feedback(query: str) -> str:
+        calls["human_feedback"] += 1
+        return f"{query} {interrupt('feedback?')}"
+
+    @entrypoint()
+    def child(query: str) -> str:
+        return human_feedback(step_1(query).result()).result()
+
+    @entrypoint(checkpointer=sync_checkpointer)
+    def parent(query: str) -> str:
+        return child.invoke(query)
+
+    config = _config()
+    parent.invoke("foo", config)
+
+    assert parent.invoke(Command(resume="baz"), config) == "foo bar baz"
+    assert calls == {"step_1": 1, "human_feedback": 2}
+
+
 # --- Reading task status from recorded writes ---


@@ -1,5 +1,8 @@
+import asyncio
+import operator
+import sys
 from dataclasses import dataclass
-from typing import Any
+from typing import Annotated, Any

 import pytest
 from langgraph.checkpoint.base import BaseCheckpointSaver
@@ -251,3 +254,61 @@ def test_interrupt_response_schema_invalid_resume_after_earlier_interrupt(
    assert graph.invoke(resume({"approved": True}), config) == {
        "answer": ["ok", Decision(approved=True)]
    }
+
+
+@pytest.mark.skipif(
+    sys.version_info < (3, 11),
+    reason="Python 3.11+ is required for async contextvars support",
+)
+async def test_invalid_resume_lets_other_answered_tasks_finish(
+    async_checkpointer: BaseCheckpointSaver,
+) -> None:
+    """An invalid answer fails the resume without cutting off the other answered tasks.
+
+    A task cancelled after its side effect keeps its answer and runs again on the next
+    resume, so the side effect would happen twice.
+    """
+    sent: list[str] = []
+
+    class State(TypedDict):
+        log: Annotated[list[str], operator.add]
+
+    async def send(state: State) -> State:
+        interrupt("send?", response_schema=Decision)
+        sent.append("email")
+        await asyncio.sleep(0.05)  # waiting on the reply to a request already sent
+        return {"log": ["sent"]}
+
+    async def check(state: State) -> State:
+        interrupt("check?", response_schema=Decision)
+        return {"log": ["checked"]}
+
+    graph = (
+        StateGraph(State)
+        .add_node("send", send)
+        .add_node("check", check)
+        .add_edge(START, "send")
+        .add_edge(START, "check")
+        .compile(checkpointer=async_checkpointer)
+    )
+    config = {"configurable": {"thread_id": "1"}}
+    await graph.ainvoke({"log": []}, config)
+    ids = {i.value: i.id for i in (await graph.aget_state(config)).interrupts}
+
+    with pytest.raises(ValidationError, match="approved"):
+        await graph.ainvoke(
+            Command(
+                resume={
+                    ids["send?"]: {"approved": True},
+                    ids["check?"]: {"approved": "nope"},
+                }
+            ),
+            config,
+        )
+    pending = [i.value for i in (await graph.aget_state(config)).interrupts]
+    assert (pending, sent) == (["check?"], ["email"])
+
+    result = await graph.ainvoke(
+        Command(resume={ids["check?"]: {"approved": True}}), config
+    )
+    assert (sorted(result["log"]), sent) == (["checked", "sent"], ["email"])
@@ -7737,6 +7737,8 @@ def test_parallel_interrupts(sync_checkpointer: BaseCheckpointSaver) -> None:
 def test_parallel_interrupts_double(sync_checkpointer: BaseCheckpointSaver) -> None:
    # --- CHILD GRAPH ---

+    answered: Counter[str] = Counter()
+
    class ChildState(BaseModel):
        prompt: str = Field(..., description="What is going to be asked to the user?")
        human_input: str | None = Field(None, description="What the human said")
@@ -7746,6 +7748,7 @@ def test_parallel_interrupts_double(sync_checkpointer: BaseCheckpointSaver) -> N

    def get_human_input(state: ChildState):
        human_input = interrupt(state.prompt)
+        answered["human"] += 1

        return dict(
            human_inputs=[human_input],  # update parent state
@@ -7753,6 +7756,7 @@ def test_parallel_interrupts_double(sync_checkpointer: BaseCheckpointSaver) -> N

    def get_dolphin_input(state: ChildState):
        human_input = interrupt(state.prompt)
+        answered["dolphin"] += 1

        return dict(
            human_inputs=[human_input],  # update parent state
@@ -7846,6 +7850,7 @@ def test_parallel_interrupts_double(sync_checkpointer: BaseCheckpointSaver) -> N

    assert invokes == 5
    assert len(events) == 5
+    assert answered == {"human": 2, "dolphin": 2}


 def test_pregel_loop_refcount():
@@ -2,6 +2,7 @@ import operator
 import sys
 from collections.abc import Callable
 from contextlib import contextmanager
+from threading import Event
 from typing import Annotated, Any

 import pytest
@@ -72,12 +73,15 @@ def _graph(
    ask: bool = False,
    fail: set[str] | None = None,
    calls: dict[str, int] | None = None,
+    before_fail: Callable[[], None] | None = None,
 ) -> Any:
    def note(name: str):
        def node(state: State) -> dict:
            if calls is not None:
                calls[name] = calls.get(name, 0) + 1
            if fail is not None and name in fail:
+                if before_fail is not None:
+                    before_fail()
                fail.discard(name)
                raise ValueError(f"{name} failed")
            return {"notes": [name]}
@@ -234,18 +238,37 @@ def test_keep_latest_keeps_a_pending_interrupt_resumable(

@pytest.mark.parametrize("make_checkpointer", SYNC)
 def test_keep_latest_keeps_writes_of_tasks_that_finished_before_a_failure(
-    make_checkpointer: Any,
+    make_checkpointer: Any, monkeypatch: pytest.MonkeyPatch
 ) -> None:
    with make_checkpointer() as checkpointer:
        calls: dict[str, int] = {}
        fail: set[str] = set()
-        graph = _graph(checkpointer, fail=fail, calls=calls)
+        left_persisted = Event()
+        put_writes = checkpointer.put_writes
+
+        def persist(config, writes, task_id, task_path=""):
+            put_writes(config, writes, task_id, task_path)
+            if ("notes", ["left"]) in writes:
+                left_persisted.set()
+
+        def wait_for_left() -> None:
+            assert left_persisted.wait(5), "left task writes were not persisted"
+
+        monkeypatch.setattr(checkpointer, "put_writes", persist)
+        graph = _graph(checkpointer, fail=fail, calls=calls, before_fail=wait_for_left)
        for thread_id in ("pruned", "twin"):
            for i in range(2):
                graph.invoke(_say(i), _config(thread_id))
+            left_persisted.clear()
            fail.add("right")
            with pytest.raises(ValueError, match="right failed"):
                graph.invoke(_say(2), _config(thread_id))
+            checkpoint = checkpointer.get_tuple(_config(thread_id))
+            assert checkpoint is not None
+            assert any(
+                channel == "notes" and value == ["left"]
+                for _, channel, value in checkpoint.pending_writes
+            )
        before = graph.get_state(_config("pruned"))

        checkpointer.prune(["pruned"])
@@ -1177,6 +1177,43 @@ def test_subgraph_interrupt_resume_with_explicit_head_checkpoint_id(
    assert result["value"] == ["sub_a", "human:answer", "sub_b"]


+def test_subgraph_replay_reasks_answered_parallel_interrupt(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    """Replaying a subgraph checkpoint asks its step's questions again, including
+    one already answered. An update checkpoint replays in place instead of
+    forking, so its tasks keep their ids and its saved answers could be reused."""
+
+    subgraph = (
+        StateGraph(State)
+        .add_node("a", lambda s: {"value": [f"a:{interrupt('a')}"]})
+        .add_node("b", lambda s: {"value": [f"b:{interrupt('b')}"]})
+        .add_edge(START, "a")
+        .add_edge(START, "b")
+        .compile(checkpointer=True)
+    )
+    graph = (
+        StateGraph(State)
+        .add_node("subgraph_node", subgraph)
+        .add_edge(START, "subgraph_node")
+        .compile(checkpointer=sync_checkpointer)
+    )
+    config = {"configurable": {"thread_id": "1"}}
+
+    def subgraph_head() -> RunnableConfig:
+        return graph.get_state(config, subgraphs=True).tasks[0].state.config
+
+    graph.invoke({"value": []}, config)
+    graph.update_state(subgraph_head(), {"value": ["u"]}, as_node="__start__")
+    result = graph.invoke(None, config)
+    question_a = next(i for i in result["__interrupt__"] if i.value == "a")
+    graph.invoke(Command(resume={question_a.id: "yes"}), config)
+
+    result = graph.invoke(None, subgraph_head())
+
+    assert sorted(i.value for i in result["__interrupt__"]) == ["a", "b"]
+
+
 def test_subgraph_replay_loads_accumulated_state_then_resume(
    sync_checkpointer: BaseCheckpointSaver,
 ) -> None:
@@ -1451,7 +1451,7 @@ wheels = [

 [[package]]
 name = "langgraph"
-version = "1.2.15"
+version = "1.2.16"
 source = { editable = "." }
 dependencies = [
    { name = "langchain-core" },
@@ -1835,7 +1835,7 @@ test = [

 [[package]]
 name = "langgraph-prebuilt"
-version = "1.1.0"
+version = "1.1.1"
 source = { editable = "../prebuilt" }
 dependencies = [
    { name = "langchain-core" },
@@ -1856,7 +1856,7 @@ dev = [
    { name = "langgraph-checkpoint", editable = "../checkpoint" },
    { name = "langgraph-checkpoint-postgres", editable = "../checkpoint-postgres" },
    { name = "langgraph-checkpoint-sqlite", editable = "../checkpoint-sqlite" },
-    { name = "psycopg-binary" },
+    { name = "psycopg", extras = ["binary"] },
    { name = "pytest" },
    { name = "pytest-asyncio" },
    { name = "pytest-mock" },
@@ -1876,7 +1876,7 @@ test = [
    { name = "langgraph-checkpoint", editable = "../checkpoint" },
    { name = "langgraph-checkpoint-postgres", editable = "../checkpoint-postgres" },
    { name = "langgraph-checkpoint-sqlite", editable = "../checkpoint-sqlite" },
-    { name = "psycopg-binary" },
+    { name = "psycopg", extras = ["binary"] },
    { name = "pytest" },
    { name = "pytest-asyncio" },
    { name = "pytest-mock" },
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"

 [project]
 name = "langgraph-prebuilt"
-version = "1.1.0"
+version = "1.1.1"
 description = "Library with high-level APIs for creating and executing LangGraph agents and tools."
 authors = []
 requires-python = ">=3.10"
@@ -46,7 +46,7 @@ test = [
    "langgraph-checkpoint-sqlite",
    "langgraph-checkpoint-postgres",
    "syrupy",
-    "psycopg-binary",
+    "psycopg[binary]",
 ]
 lint = [
    "ruff",
@@ -253,7 +253,7 @@ wheels = [

 [[package]]
 name = "langchain-core"
-version = "1.6.1"
+version = "1.6.5"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "httpx" },
@@ -267,9 +267,9 @@ dependencies = [
    { name = "typing-extensions" },
    { name = "uuid-utils" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/90/12/aff76ca89c219ebe6f9dd3c5dbc4e3b1cf5450e9fc7037dccad23d45cd7a/langchain_core-1.6.1.tar.gz", hash = "sha256:1b156cb395aac4f009a8a1b38a574c7d948fe2d5f74c96e0d8a5017b4149e04f", size = 1003359, upload-time = "2026-08-27T19:31:14.956Z" }
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 [[package]]
@@ -3,7 +3,7 @@ from langgraph_sdk.client import get_client, get_sync_client
 from langgraph_sdk.encryption import Encryption
 from langgraph_sdk.encryption.types import DecryptResult, EncryptionContext

-__version__ = "0.4.7"
+__version__ = "0.4.8"

 __all__ = [
    "Auth",
@@ -15,6 +15,7 @@ from __future__ import annotations

 import asyncio
 import contextlib
+import logging
 import random
 from collections.abc import AsyncGenerator, AsyncIterator, Generator, Mapping
 from dataclasses import dataclass, field
@@ -36,6 +37,11 @@ from langgraph_sdk.stream.decoders import (
    ToolCallsDecoder,
    validate_interleave_channels,
 )
+from langgraph_sdk.stream.errors import (
+    is_non_retryable_stream_error,
+    protocol_error,
+    stream_error_frame,
+)
 from langgraph_sdk.stream.subscription import compute_union_filter, infer_channel
 from langgraph_sdk.stream.transport import (
    AsyncProtocolTransport,
@@ -44,6 +50,8 @@ from langgraph_sdk.stream.transport import (
    ProtocolWebSocketTransport,
 )

+logger = logging.getLogger(__name__)
+

 class InterruptPayload(TypedDict):
    """Payload surfaced when the server requests human input for a thread."""
@@ -193,6 +201,7 @@ class RunModule:
            if not gate.done():
                gate.set_result(None)
            self._owner._run_seen = True
+            self._owner._ensure_lifecycle_watcher_running()
            return result
        except BaseException as err:
            # Why: gate MUST reject on any exit type, including CancelledError,
@@ -1203,6 +1212,7 @@ class AsyncThreadStream:
        # observes a `completed`/`errored` event.
        self._interrupts_lock = asyncio.Lock()
        self._lifecycle_watcher_task: asyncio.Task[None] | None = None
+        self._lifecycle_watcher_rejected = False
        self._lifecycle_watcher_handle: EventStreamHandle | None = None
        self._lifecycle_cursor: int | None = None
        self._lifecycle_max_reconnect_attempts = 5
@@ -1261,8 +1271,11 @@ class AsyncThreadStream:
        # Create the run-done future here (async context guarantees a running loop).
        self._run_done = asyncio.get_running_loop().create_future()
        # Start the lifecycle watcher immediately so reattach and thread.output
-        # work without a preceding run.start call.
-        self._ensure_lifecycle_watcher_running()
+        # work without a preceding run.start call. A minted thread_id names no
+        # thread until run.start creates it, and with custom auth a stream for a
+        # thread that doesn't exist yet fails, so run.start starts the watcher.
+        if self._explicit_thread_id:
+            self._ensure_lifecycle_watcher_running()
        return self

    async def __aexit__(self, exc_type: Any, exc: Any, tb: Any) -> None:
@@ -1630,6 +1643,13 @@ class AsyncThreadStream:
                async for event in self._dedup_iter(shared.events):
                    if self._closed:
                        break
+                    if (frame_error := stream_error_frame(event)) is not None:
+                        logger.warning(
+                            "Thread %s event stream failed: %s",
+                            self.thread_id,
+                            frame_error,
+                        )
+                        continue
                    self._observe_event(event)
                    for sub in list(self._subscriptions.values()):
                        if matches_subscription(event, sub.params):
@@ -1655,6 +1675,7 @@ class AsyncThreadStream:
                if (
                    err is not None
                    and not isinstance(err, asyncio.CancelledError)
+                    and not is_non_retryable_stream_error(err)
                    and not self._closed
                ):
                    with contextlib.suppress(Exception):
@@ -1681,7 +1702,8 @@ class AsyncThreadStream:

        Returns:
            `True` if a new stream was opened (caller should resume fanout),
-            `False` if all reconnect attempts were exhausted or the controller
+            `False` if all reconnect attempts were exhausted, the server
+            rejected the stream with a non-retryable 4xx, or the controller
            was closed in the meantime.
        """
        if self._transport is None:
@@ -1702,7 +1724,9 @@ class AsyncThreadStream:
                await new_stream.ready
            except asyncio.CancelledError:
                raise
-            except Exception:
+            except Exception as err:
+                if is_non_retryable_stream_error(err):
+                    return False
                await self._reconnect_sleep(attempt)
                continue
            self._shared_stream = new_stream
@@ -1800,9 +1824,7 @@ class AsyncThreadStream:
            # 202/204 — no body. Caller gets an empty result.
            return {}
        if response.get("type") == "error":
-            code = response.get("error", "unknown")
-            message = response.get("message", "")
-            raise RuntimeError(f"Protocol error [{code}]: {message}")
+            raise protocol_error(response)
        meta = response.get("meta")
        if isinstance(meta, dict):
            applied_through_seq = meta.get("applied_through_seq")
@@ -1826,8 +1848,15 @@ class AsyncThreadStream:
            await asyncio.wait_for(asyncio.shield(gate), timeout=timeout)

    def _ensure_lifecycle_watcher_running(self) -> None:
-        if self._lifecycle_watcher_task is not None:
+        task = self._lifecycle_watcher_task
+        if task is not None and not self._lifecycle_watcher_rejected:
            return
+        if task is not None:
+            # A 4xx stopped the watcher before this run started, typically the
+            # 404 for a thread this run.start just created, so the result it
+            # left isn't this run's.
+            self._run_done = asyncio.get_running_loop().create_future()
+            self._lifecycle_watcher_rejected = False
        self._lifecycle_watcher_task = asyncio.create_task(
            self._run_lifecycle_watcher()
        )
@@ -1850,7 +1879,11 @@ class AsyncThreadStream:
        if self._transport is None:
            return
        reconnect_attempts = 0
+        frame_error: RuntimeError | None = None
        while not self._closed:
+            # A stream opened before run.start can 404 for the thread that
+            # run.start creates, so it gets one more try once a run has started.
+            opened_before_run = not self._run_seen
            try:
                handle = self._transport.open_event_stream(
                    self._lifecycle_stream_params()
@@ -1860,6 +1893,7 @@ class AsyncThreadStream:
                async for event in handle.events:
                    if self._closed:
                        return
+                    frame_error = stream_error_frame(event) or frame_error
                    self._observe_lifecycle_event(event)
                    await self._apply_lifecycle_event(event)
                err = await handle.done
@@ -1868,38 +1902,43 @@ class AsyncThreadStream:
                    # event. Resolve `_run_done` as errored so awaiters of
                    # `thread.output` don't hang.
                    if err is None:
-                        run_done = self._run_done
-                        if run_done is not None and not run_done.done():
-                            run_done.set_result(
-                                _RunTerminal(
-                                    status="errored",
-                                    error=RuntimeError(
-                                        "lifecycle stream ended before terminal event"
-                                    ),
-                                )
+                        self._fail_run_done(
+                            frame_error
+                            or RuntimeError(
+                                "lifecycle stream ended before terminal event"
                            )
+                        )
                    return
                reconnect_attempts += 1
-                if reconnect_attempts > self._lifecycle_max_reconnect_attempts:
+                if (
+                    is_non_retryable_stream_error(err)
+                    or reconnect_attempts > self._lifecycle_max_reconnect_attempts
+                ):
                    raise err
                await asyncio.sleep(0.05)
            except asyncio.CancelledError:
                raise
            except Exception as exc:
+                if is_non_retryable_stream_error(exc):
+                    if opened_before_run and self._run_seen:
+                        continue
+                    self._lifecycle_watcher_rejected = True
+                    self._fail_run_done(exc)
+                    return
                reconnect_attempts += 1
                if reconnect_attempts <= self._lifecycle_max_reconnect_attempts:
                    await asyncio.sleep(0.05)
                    continue
-                run_done = self._run_done
-                if run_done is not None and not run_done.done():
-                    run_done.set_result(
-                        _RunTerminal(
-                            status="errored",
-                            error=RuntimeError(f"Lifecycle transport failed: {exc}"),
-                        )
-                    )
+                self._fail_run_done(
+                    frame_error or RuntimeError(f"Lifecycle transport failed: {exc}")
+                )
                return

+    def _fail_run_done(self, error: BaseException) -> None:
+        run_done = self._run_done
+        if run_done is not None and not run_done.done():
+            run_done.set_result(_RunTerminal(status="errored", error=error))
+
    async def _fetch_state(self) -> dict[str, Any]:
        """Fetch the current thread state from the REST endpoint."""
        return await self._http.get(
@@ -34,6 +34,11 @@ from langgraph_sdk.stream.decoders import (
    ToolCallsDecoder,
    validate_interleave_channels,
 )
+from langgraph_sdk.stream.errors import (
+    is_non_retryable_stream_error,
+    protocol_error,
+    stream_error_frame,
+)
 from langgraph_sdk.stream.subscription import compute_union_filter, infer_channel
 from langgraph_sdk.stream.sync_controller import (
    SyncStreamController,
@@ -237,6 +242,7 @@ class SyncRunModule:
        controller = self._owner._controller
        if controller is not None and controller._run_start_gate is not None:
            controller._run_start_gate.set()
+        self._owner._ensure_lifecycle_watcher_running()
        return result

    def respond(
@@ -1111,6 +1117,7 @@ class SyncThreadStream:
        self.interrupted: bool = False
        self.interrupts: list[InterruptPayload] = []
        self._lifecycle_watcher_thread: threading.Thread | None = None
+        self._lifecycle_watcher_lock = threading.Lock()
        self._lifecycle_watcher_handle: SyncEventStreamHandle | None = None
        self._lifecycle_cursor: int | None = None
        self._lifecycle_max_reconnect_attempts = 5
@@ -1149,7 +1156,11 @@ class SyncThreadStream:
            self._transport, run_start_gate=run_start_gate
        )
        self._run_done = _BlockingResult()
-        self._ensure_lifecycle_watcher_running()
+        # A minted thread_id names no thread until run.start creates it, and
+        # with custom auth a stream for a thread that doesn't exist yet fails,
+        # so run.start starts the watcher instead.
+        if self._explicit_thread_id:
+            self._ensure_lifecycle_watcher_running()
        return self

    def __exit__(self, exc_type: Any, exc: Any, tb: Any) -> None:
@@ -1485,9 +1496,7 @@ class SyncThreadStream:
        if response is None:
            return {}
        if response.get("type") == "error":
-            code = response.get("error", "unknown")
-            message = response.get("message", "")
-            raise RuntimeError(f"Protocol error [{code}]: {message}")
+            raise protocol_error(response)
        meta = response.get("meta")
        if isinstance(meta, dict):
            applied_through_seq = meta.get("applied_through_seq")
@@ -1496,14 +1505,20 @@ class SyncThreadStream:
        return response.get("result", {})

    def _ensure_lifecycle_watcher_running(self) -> None:
-        if self._lifecycle_watcher_thread is not None:
-            return
-        self._lifecycle_watcher_thread = threading.Thread(
-            target=self._run_lifecycle_watcher,
-            name="langgraph-sdk-sync-lifecycle",
-            daemon=True,
-        )
-        self._lifecycle_watcher_thread.start()
+        with self._lifecycle_watcher_lock:
+            if self._lifecycle_watcher_thread is not None:
+                return
+            if self._run_done is not None and self._run_done.done():
+                # A 4xx stopped the watcher before this run started, typically
+                # the 404 for a thread this run.start just created, so the
+                # result it left isn't this run's.
+                self._run_done = _BlockingResult()
+            self._lifecycle_watcher_thread = threading.Thread(
+                target=self._run_lifecycle_watcher,
+                name="langgraph-sdk-sync-lifecycle",
+                daemon=True,
+            )
+            self._lifecycle_watcher_thread.start()

    def _observe_lifecycle_event(self, event: Event) -> None:
        seq = event.get("seq")
@@ -1523,7 +1538,11 @@ class SyncThreadStream:
        if self._transport is None:
            return
        reconnect_attempts = 0
+        frame_error: RuntimeError | None = None
        while not self._closed:
+            # A stream opened before run.start can 404 for the thread that
+            # run.start creates, so it gets one more try once a run has started.
+            opened_before_run = not self._run_seen
            try:
                handle = self._transport.open_event_stream(
                    self._lifecycle_stream_params()
@@ -1532,28 +1551,64 @@ class SyncThreadStream:
                for event in handle.events:
                    if self._closed:
                        return
+                    frame_error = stream_error_frame(event) or frame_error
                    self._observe_lifecycle_event(event)
                    self._apply_lifecycle_event(event)
                err = handle.error()
                if err is None:
+                    # Clean EOF: stream ended without a terminal lifecycle
+                    # event. Resolve `_run_done` as errored so `thread.output`
+                    # doesn't block forever.
+                    if not self._closed:
+                        self._fail_run_done(
+                            frame_error
+                            or RuntimeError(
+                                "lifecycle stream ended before terminal event"
+                            )
+                        )
                    return
                reconnect_attempts += 1
-                if reconnect_attempts > self._lifecycle_max_reconnect_attempts:
+                if (
+                    is_non_retryable_stream_error(err)
+                    or reconnect_attempts > self._lifecycle_max_reconnect_attempts
+                ):
                    raise err
            except Exception as exc:
+                if is_non_retryable_stream_error(exc):
+                    if self._stop_rejected_lifecycle_watcher(
+                        exc, unless_run_started=opened_before_run
+                    ):
+                        return
+                    continue
                reconnect_attempts += 1
                if reconnect_attempts <= self._lifecycle_max_reconnect_attempts:
                    continue
-                run_done = self._run_done
-                if run_done is not None and not run_done.done():
-                    run_done.set_result(
-                        _RunTerminal(
-                            status="errored",
-                            error=RuntimeError(f"Lifecycle transport failed: {exc}"),
-                        )
-                    )
+                self._fail_run_done(
+                    frame_error or RuntimeError(f"Lifecycle transport failed: {exc}")
+                )
                return

+    def _stop_rejected_lifecycle_watcher(
+        self, error: BaseException, *, unless_run_started: bool = False
+    ) -> bool:
+        """Fail the run with a 4xx `error` and clear the watcher, so run.start starts another.
+
+        Returns False, changing nothing, when `unless_run_started` is set and a
+        run has started. Holding the lock keeps a run.start from seeing this
+        watcher as still running once it has decided to stop.
+        """
+        with self._lifecycle_watcher_lock:
+            if unless_run_started and self._run_seen:
+                return False
+            self._fail_run_done(error)
+            self._lifecycle_watcher_thread = None
+            return True
+
+    def _fail_run_done(self, error: BaseException) -> None:
+        run_done = self._run_done
+        if run_done is not None and not run_done.done():
+            run_done.set_result(_RunTerminal(status="errored", error=error))
+
    def _fetch_state(self) -> dict[str, Any]:
        """Fetch the current thread state from the REST endpoint."""
        return self._http.get(
@@ -0,0 +1,46 @@
+"""Thread-stream failures, shared by the async and sync clients."""
+
+from __future__ import annotations
+
+from typing import Any
+
+import httpx
+from websockets.exceptions import ConnectionClosed, InvalidStatus
+
+
+def protocol_error(response: dict[str, Any]) -> RuntimeError:
+    """Build the error for a protocol `{"type": "error"}` envelope."""
+    code = response.get("error", "unknown")
+    message = response.get("message", "")
+    return RuntimeError(f"Protocol error [{code}]: {message}")
+
+
+def stream_error_frame(event: Any) -> RuntimeError | None:
+    """Return the error in an unsolicited `{"type": "error", "id": null}` frame.
+
+    The server sends one just before it closes a thread stream whose read failed.
+    """
+    if (
+        isinstance(event, dict)
+        and event.get("type") == "error"
+        and event.get("id") is None
+    ):
+        return protocol_error(event)
+    return None
+
+
+def is_non_retryable_stream_error(error: BaseException | None) -> bool:
+    """Whether reopening the stream would fail the same way.
+
+    True for a 4xx other than 408 and 429: the status of a refused stream request
+    or WebSocket upgrade, or a WebSocket close code of 4000 plus that status. A
+    server that rejects a WebSocket after accepting it closes with such a code,
+    because a browser can't read the status of a refused upgrade.
+    """
+    if isinstance(error, (httpx.HTTPStatusError, InvalidStatus)):
+        status = error.response.status_code
+    elif isinstance(error, ConnectionClosed) and error.rcvd is not None:
+        status = error.rcvd.code - 4000
+    else:
+        return False
+    return 400 <= status < 500 and status not in (408, 429)
@@ -13,6 +13,10 @@ from typing import Any

 from langchain_protocol import Event, SubscribeParams

+from langgraph_sdk.stream.errors import (
+    is_non_retryable_stream_error,
+    stream_error_frame,
+)
 from langgraph_sdk.stream.subscription import compute_union_filter, filter_covers
 from langgraph_sdk.stream.transport import (
    SyncEventStreamHandle,
@@ -167,6 +171,13 @@ class SyncStreamController:
                return
            try:
                for event in self._dedup_iter(shared.events):
+                    if (frame_error := stream_error_frame(event)) is not None:
+                        _logger.warning(
+                            "Thread %s event stream failed: %s",
+                            self._transport.thread_id,
+                            frame_error,
+                        )
+                        continue
                    with self._lock:
                        if self._closed:
                            break
@@ -190,7 +201,11 @@ class SyncStreamController:
                    continue  # rotation happened; pick up new stream
                # No rotation — check if this was a transport drop
            err = shared.error()
-            if err is not None and not self._closed:
+            if (
+                err is not None
+                and not is_non_retryable_stream_error(err)
+                and not self._closed
+            ):
                if self._reconnect_shared_stream():
                    continue
            break
@@ -199,25 +214,6 @@ class SyncStreamController:
            for sub in self._subscriptions.values():
                sub.queue.put(None)

-    def _reconnect_shared_stream(self) -> bool:
-        with self._lock:
-            base_filter = self._shared_stream_filter
-        if base_filter is None:
-            return False
-        for _ in range(self._max_reconnect_attempts):
-            with self._lock:
-                if self._closed:
-                    return False
-                params = self._filter_with_since(base_filter)
-            try:
-                new_stream = self._transport.open_event_stream(params)
-            except Exception:
-                continue
-            with self._lock:
-                self._shared_stream = new_stream
-            return True
-        return False
-
    def _compute_current_union(
        self, extra: SubscribeParams | None = None
    ) -> dict[str, Any]:
@@ -296,7 +292,8 @@ class SyncStreamController:
        """Attempt to reopen the shared stream after a transport drop.

        Returns True if a new stream was successfully opened, False if all
-        reconnect attempts were exhausted or the controller was closed.
+        reconnect attempts were exhausted, the server rejected the stream with a
+        non-retryable 4xx, or the controller was closed.
        """
        base_filter = self._shared_stream_filter
        if base_filter is None:
@@ -317,6 +314,8 @@ class SyncStreamController:
                        old.close()
                return True
            except Exception as err:
+                if is_non_retryable_stream_error(err):
+                    return False
                _logger.debug("sync reconnect attempt %d failed: %r", attempt, err)
        return False

@@ -69,6 +69,16 @@ def lifecycle_errored_event(
    return _base(seq, "lifecycle", namespace or [], {"event": "failed", "error": error})


+def thread_stream_failed_frame() -> dict[str, Any]:
+    """Unsolicited error frame the server sends before closing a failed stream."""
+    return {
+        "type": "error",
+        "id": None,
+        "error": "unknown_error",
+        "message": "Thread event stream failed.",
+    }
+
+
 def values_event(
    seq: int = 0, namespace: list[str] | None = None, **data: Any
 ) -> dict[str, Any]:
@@ -60,6 +60,7 @@ class _StreamScript:
    events: list[dict[str, Any]]
    delay: float = 0.0
    fail_after: int | None = None
+    status: int = 200


 class FakeServer:
@@ -263,6 +264,8 @@ class FakeServer:
                    events=list(self.scripted_events), delay=self._stream_delay
                )
            )
+            if script.status != 200:
+                return httpx.Response(script.status, json={"detail": "scripted"})
            self.open_event_streams += 1
            self._open_event_streams_max = max(
                self._open_event_streams_max, self.open_event_streams
@@ -14,6 +14,7 @@ import orjson
 class SyncStreamScript:
    events: list[dict[str, Any]]
    fail_after: int | None = None
+    status: int = 200


 class _SseByteStream(httpx.SyncByteStream):
@@ -113,6 +114,8 @@ class SyncFakeServer:
                if self._stream_scripts
                else SyncStreamScript(events=list(self.scripted_events))
            )
+            if script.status != 200:
+                return httpx.Response(script.status, json={"detail": "scripted"})
            return httpx.Response(
                200,
                headers={"content-type": "text/event-stream"},
@@ -0,0 +1,67 @@
+"""Child lifecycle completion must not finish the parent thread's output."""
+
+from __future__ import annotations
+
+import asyncio
+from typing import cast
+
+import httpx
+import pytest
+from langchain_protocol import Event
+
+from langgraph_sdk._async.http import HttpClient
+from langgraph_sdk._async.threads import ThreadsClient
+from langgraph_sdk._sync.http import SyncHttpClient
+from langgraph_sdk._sync.stream import _BlockingResult
+from langgraph_sdk._sync.threads import SyncThreadsClient
+from streaming._events import input_requested_event, lifecycle_event
+
+
+@pytest.mark.parametrize("phase", ["completed", "failed"])
+async def test_async_child_terminal_does_not_finish_root(phase):
+    async with httpx.AsyncClient(base_url="http://test") as raw:
+        thread = ThreadsClient(HttpClient(raw)).stream(
+            thread_id="t-1", assistant_id="agent"
+        )
+        thread._run_done = asyncio.get_running_loop().create_future()
+        await thread._apply_lifecycle_event(
+            cast(Event, input_requested_event(namespace=["sub:1"]))
+        )
+        await thread._apply_lifecycle_event(
+            cast(Event, lifecycle_event(namespace=["sub:1"], event=phase))
+        )
+        assert not thread._run_done.done()
+        assert thread.interrupted
+        assert thread.interrupts[0]["namespace"] == ["sub:1"]
+
+        await thread._apply_lifecycle_event(
+            cast(Event, lifecycle_event(event="completed"))
+        )
+        assert thread._run_done.done()
+        assert (await thread._run_done).error is None
+        assert not thread.interrupted
+        assert thread.interrupts == []
+
+
+@pytest.mark.parametrize("phase", ["completed", "failed"])
+def test_sync_child_terminal_does_not_finish_root(phase):
+    with httpx.Client(base_url="http://test") as raw:
+        thread = SyncThreadsClient(SyncHttpClient(raw)).stream(
+            thread_id="t-1", assistant_id="agent"
+        )
+        thread._run_done = _BlockingResult()
+        thread._apply_lifecycle_event(
+            cast(Event, input_requested_event(namespace=["sub:1"]))
+        )
+        thread._apply_lifecycle_event(
+            cast(Event, lifecycle_event(namespace=["sub:1"], event=phase))
+        )
+        assert not thread._run_done.done()
+        assert thread.interrupted
+        assert thread.interrupts[0]["namespace"] == ["sub:1"]
+
+        thread._apply_lifecycle_event(cast(Event, lifecycle_event(event="completed")))
+        assert thread._run_done.done()
+        assert thread._run_done.result().error is None
+        assert not thread.interrupted
+        assert thread.interrupts == []
@@ -17,6 +17,7 @@ from streaming._events import (
    lifecycle_completed_event,
    lifecycle_errored_event,
    lifecycle_event,
+    thread_stream_failed_frame,
 )
 from streaming._fake_server import FakeServer, _StreamScript

@@ -48,7 +49,7 @@ async def test_interrupts_populated_from_input_requested_event():


 async def test_aenter_starts_lifecycle_watcher():
-    """Entering AsyncThreadStream opens lifecycle/input SSE before run.start."""
+    """Entering with an explicit thread_id opens the lifecycle/input SSE before run.start."""
    fake = FakeServer()
    fake.script([lifecycle_event(seq=0, phase="started")])
    asgi = httpx.ASGITransport(app=fake.app)
@@ -274,3 +275,137 @@ async def test_lifecycle_watcher_reconnects_with_since_after_transport_drop():
    assert fake.stream_request_bodies[0]["channels"] == ["lifecycle", "input"]
    assert fake.stream_request_bodies[1]["channels"] == ["lifecycle", "input"]
    assert fake.stream_request_bodies[1]["since"] == 1
+
+
+async def test_lifecycle_error_frame_becomes_the_run_error():
+    fake = FakeServer()
+    fake.script([lifecycle_event(seq=0, phase="running"), thread_stream_failed_frame()])
+    async with httpx.AsyncClient(
+        transport=fake.transport, base_url="http://test"
+    ) as raw:
+        threads = ThreadsClient(HttpClient(raw))
+        async with threads.stream(thread_id="t-1", assistant_id="agent") as thread:
+            run_done = thread._run_done
+            assert run_done is not None
+            terminal = await asyncio.wait_for(run_done, timeout=2.0)
+
+    assert terminal.status == "errored"
+    assert (
+        str(terminal.error)
+        == "Protocol error [unknown_error]: Thread event stream failed."
+    )
+
+
+async def test_lifecycle_watcher_stops_on_a_404_without_retrying():
+    fake = FakeServer()
+    fake.script_sequence([_StreamScript(events=[], status=404)])
+    async with httpx.AsyncClient(
+        transport=fake.transport, base_url="http://test"
+    ) as raw:
+        threads = ThreadsClient(HttpClient(raw))
+        async with threads.stream(thread_id="t-1", assistant_id="agent") as thread:
+            run_done = thread._run_done
+            assert run_done is not None
+            terminal = await asyncio.wait_for(run_done, timeout=2.0)
+
+    assert isinstance(terminal.error, httpx.HTTPStatusError)
+    assert terminal.error.response.status_code == 404
+    assert len(fake.stream_request_bodies) == 1
+
+
+async def test_minted_thread_opens_the_lifecycle_stream_after_run_start():
+    fake = FakeServer()
+    fake.script([lifecycle_completed_event(seq=1)])
+    async with httpx.AsyncClient(
+        transport=fake.transport, base_url="http://test"
+    ) as raw:
+        threads = ThreadsClient(HttpClient(raw))
+        async with threads.stream(assistant_id="agent") as thread:
+            assert thread._lifecycle_watcher_task is None
+            await thread.run.start(input={})
+            run_done = thread._run_done
+            assert run_done is not None
+            terminal = await asyncio.wait_for(run_done, timeout=2.0)
+
+    assert terminal.status == "completed"
+
+
+def _new_thread_scripts() -> list[_StreamScript]:
+    return [
+        _StreamScript(events=[], status=404),
+        _StreamScript(events=[lifecycle_completed_event(seq=1)]),
+    ]
+
+
+async def test_run_start_restarts_a_watcher_stopped_by_a_404_for_a_new_thread():
+    fake = FakeServer()
+    fake.script_sequence(_new_thread_scripts())
+    fake.set_state({"ok": True})
+    async with httpx.AsyncClient(
+        transport=fake.transport, base_url="http://test"
+    ) as raw:
+        threads = ThreadsClient(HttpClient(raw))
+        async with threads.stream(thread_id="t-new", assistant_id="agent") as thread:
+            rejected = thread._run_done
+            assert rejected is not None
+            await asyncio.wait_for(rejected, timeout=2.0)
+            await thread.run.start(input={})
+            output = await thread.output.with_timeout(2.0)
+
+    assert output == {"ok": True}
+    assert len(fake.stream_request_bodies) == 2
+
+
+async def test_lifecycle_watcher_retries_a_404_that_arrives_after_run_start():
+    fake = FakeServer()
+    fake.script_sequence(_new_thread_scripts())
+    fake.set_state({"ok": True})
+    stream_opened = asyncio.Event()
+    run_started = asyncio.Event()
+
+    async def handle(request: httpx.Request) -> httpx.Response:
+        if (
+            request.url.path.endswith("/stream/events")
+            and not fake.stream_request_bodies
+        ):
+            stream_opened.set()
+            await run_started.wait()
+        return await fake._handle_request(request)
+
+    async with httpx.AsyncClient(
+        transport=httpx.MockTransport(handle), base_url="http://test"
+    ) as raw:
+        threads = ThreadsClient(HttpClient(raw))
+        async with threads.stream(thread_id="t-new", assistant_id="agent") as thread:
+            await asyncio.wait_for(stream_opened.wait(), timeout=2.0)
+            await thread.run.start(input={})
+            run_started.set()
+            output = await thread.output.with_timeout(2.0)
+
+    assert output == {"ok": True}
+    assert len(fake.stream_request_bodies) == 2
+
+
+async def test_lifecycle_watcher_reports_the_error_frame_when_reconnects_run_out():
+    fake = FakeServer()
+    async with httpx.AsyncClient(
+        transport=fake.transport, base_url="http://test"
+    ) as raw:
+        threads = ThreadsClient(HttpClient(raw))
+        stream = threads.stream(thread_id="t-1", assistant_id="agent")
+        stream._lifecycle_max_reconnect_attempts = 1
+        fake.script_sequence(
+            [
+                _StreamScript(events=[thread_stream_failed_frame()], fail_after=1)
+                for _ in range(stream._lifecycle_max_reconnect_attempts + 1)
+            ]
+        )
+        async with stream as thread:
+            run_done = thread._run_done
+            assert run_done is not None
+            terminal = await asyncio.wait_for(run_done, timeout=2.0)
+
+    assert (
+        str(terminal.error)
+        == "Protocol error [unknown_error]: Thread event stream failed."
+    )
@@ -1,11 +1,13 @@
 from __future__ import annotations

 import asyncio
-from collections.abc import AsyncGenerator
+from collections.abc import AsyncGenerator, AsyncIterator
 from typing import Any, cast
 from unittest.mock import MagicMock

 import httpx
+from websockets.exceptions import ConnectionClosedError
+from websockets.frames import Close

 from langgraph_sdk._async.http import HttpClient
 from langgraph_sdk._async.threads import ThreadsClient
@@ -348,3 +350,66 @@ async def test_send_command_applied_through_seq_seeds_shared_stream_since():
    ]
    assert len(values_requests) == 1
    assert values_requests[0]["since"] == 17
+
+
+async def _drain(events: AsyncIterator[Any]) -> list[Any]:
+    return [event async for event in events]
+
+
+async def test_shared_stream_stops_reconnecting_on_a_404():
+    fake = FakeServer()
+    fake.script_sequence(
+        [
+            _StreamScript(events=[values_event(seq=1)], fail_after=1),
+            _StreamScript(events=[], status=404),
+        ]
+    )
+    async with httpx.AsyncClient(
+        transport=fake.transport, base_url="http://test"
+    ) as raw:
+        threads = ThreadsClient(HttpClient(raw))
+        async with threads.stream(assistant_id="agent") as thread:
+            received = await asyncio.wait_for(
+                _drain(thread.subscribe(["values"])), timeout=5.0
+            )
+
+    assert [event["seq"] for event in received] == [1]
+    assert len(fake.stream_request_bodies) == 2
+
+
+async def test_shared_stream_does_not_reconnect_after_a_4404_close(
+    monkeypatch: Any,
+) -> None:
+    opened: list[dict[str, Any]] = []
+
+    def open_then_close_with_4404(
+        _self: ProtocolSseTransport, params: dict[str, Any]
+    ) -> EventStreamHandle:
+        opened.append(params)
+        loop = asyncio.get_running_loop()
+        ready: asyncio.Future[None] = loop.create_future()
+        ready.set_result(None)
+        done: asyncio.Future[BaseException | None] = loop.create_future()
+        done.set_result(ConnectionClosedError(Close(4404, "not found"), None))
+
+        async def events() -> AsyncGenerator[Any, None]:
+            await asyncio.sleep(0)
+            yield values_event(seq=1)
+
+        async def close() -> None:
+            return None
+
+        return EventStreamHandle(events=events(), ready=ready, done=done, close=close)
+
+    monkeypatch.setattr(
+        ProtocolSseTransport, "open_event_stream", open_then_close_with_4404
+    )
+    async with httpx.AsyncClient(base_url="http://test") as raw:
+        threads = ThreadsClient(HttpClient(raw))
+        async with threads.stream(assistant_id="agent") as thread:
+            received = await asyncio.wait_for(
+                _drain(thread.subscribe(["values"])), timeout=5.0
+            )
+
+    assert [event["seq"] for event in received] == [1]
+    assert len(opened) == 1
@@ -0,0 +1,67 @@
+from __future__ import annotations
+
+import httpx
+import pytest
+from websockets.datastructures import Headers
+from websockets.exceptions import ConnectionClosedError, InvalidStatus
+from websockets.frames import Close
+from websockets.http11 import Response
+
+from langgraph_sdk.stream.errors import (
+    is_non_retryable_stream_error,
+    stream_error_frame,
+)
+
+
+def _http_error(status: int) -> httpx.HTTPStatusError:
+    request = httpx.Request("POST", "http://test/threads/t-1/stream/events")
+    response = httpx.Response(status, request=request)
+    return httpx.HTTPStatusError("scripted", request=request, response=response)
+
+
+def _ws_close(code: int) -> ConnectionClosedError:
+    return ConnectionClosedError(Close(code, "scripted"), None)
+
+
+@pytest.mark.parametrize(
+    ("error", "expected"),
+    [
+        pytest.param(_http_error(403), True, id="http-403"),
+        pytest.param(_http_error(404), True, id="http-404"),
+        pytest.param(_http_error(408), False, id="http-408"),
+        pytest.param(_http_error(429), False, id="http-429"),
+        pytest.param(_http_error(503), False, id="http-503"),
+        pytest.param(_ws_close(4404), True, id="ws-close-4404"),
+        pytest.param(_ws_close(4422), True, id="ws-close-4422"),
+        pytest.param(_ws_close(4429), False, id="ws-close-4429"),
+        pytest.param(_ws_close(4503), False, id="ws-close-4503"),
+        pytest.param(_ws_close(1011), False, id="ws-close-1011"),
+        pytest.param(
+            InvalidStatus(Response(403, "Forbidden", Headers())),
+            True,
+            id="ws-upgrade-403",
+        ),
+        pytest.param(RuntimeError("network down"), False, id="no-status"),
+        pytest.param(None, False, id="none"),
+    ],
+)
+def test_is_non_retryable_stream_error(
+    error: BaseException | None, expected: bool
+) -> None:
+    assert is_non_retryable_stream_error(error) is expected
+
+
+def test_stream_error_frame_reads_only_unsolicited_error_frames() -> None:
+    frame = {
+        "type": "error",
+        "id": None,
+        "error": "unknown_error",
+        "message": "Thread event stream failed.",
+    }
+
+    assert (
+        str(stream_error_frame(frame))
+        == "Protocol error [unknown_error]: Thread event stream failed."
+    )
+    assert stream_error_frame({**frame, "id": 3}) is None
+    assert stream_error_frame({"type": "event", "method": "values"}) is None
@@ -35,6 +35,7 @@ from streaming._events import (
    message_text_delta_event,
    message_text_finish_event,
    tasks_start_event,
+    thread_stream_failed_frame,
    tool_finished_event,
    tool_started_event,
    updates_event,
@@ -868,3 +869,196 @@ def test_interleave_projections_data_channel_scoped_to_root_namespace():
            ]
    assert {"scope": "root"} in checkpoints
    assert {"scope": "child"} not in checkpoints
+
+
+def test_sync_lifecycle_clean_eof_fails_the_run_instead_of_blocking():
+    fake = SyncFakeServer()
+    fake.script([lifecycle_started_event(seq=0)])
+    with httpx.Client(transport=fake.transport, base_url="http://test") as raw:
+        threads = SyncThreadsClient(SyncHttpClient(raw))
+        with threads.stream(thread_id="t-1", assistant_id="agent") as thread:
+            run_done = thread._run_done
+            assert run_done is not None
+            terminal = run_done.result(timeout=2.0)
+
+    assert terminal.status == "errored"
+    assert "ended before terminal" in str(terminal.error)
+
+
+def test_sync_lifecycle_error_frame_becomes_the_run_error():
+    fake = SyncFakeServer()
+    fake.script([lifecycle_event(seq=0, phase="running"), thread_stream_failed_frame()])
+    with httpx.Client(transport=fake.transport, base_url="http://test") as raw:
+        threads = SyncThreadsClient(SyncHttpClient(raw))
+        with threads.stream(thread_id="t-1", assistant_id="agent") as thread:
+            run_done = thread._run_done
+            assert run_done is not None
+            terminal = run_done.result(timeout=2.0)
+
+    assert terminal.status == "errored"
+    assert (
+        str(terminal.error)
+        == "Protocol error [unknown_error]: Thread event stream failed."
+    )
+
+
+def test_sync_lifecycle_watcher_stops_on_a_404_without_retrying():
+    fake = SyncFakeServer()
+    fake.script_sequence([SyncStreamScript(events=[], status=404)])
+    with httpx.Client(transport=fake.transport, base_url="http://test") as raw:
+        threads = SyncThreadsClient(SyncHttpClient(raw))
+        with threads.stream(thread_id="t-1", assistant_id="agent") as thread:
+            run_done = thread._run_done
+            assert run_done is not None
+            terminal = run_done.result(timeout=2.0)
+
+    assert isinstance(terminal.error, httpx.HTTPStatusError)
+    assert terminal.error.response.status_code == 404
+    assert len(fake.stream_request_bodies) == 1
+
+
+def test_sync_minted_thread_opens_the_lifecycle_stream_after_run_start():
+    fake = SyncFakeServer()
+    fake.script([lifecycle_completed_event(seq=1)])
+    with httpx.Client(transport=fake.transport, base_url="http://test") as raw:
+        threads = SyncThreadsClient(SyncHttpClient(raw))
+        with threads.stream(assistant_id="agent") as thread:
+            assert thread._lifecycle_watcher_thread is None
+            thread.run.start(input={})
+            run_done = thread._run_done
+            assert run_done is not None
+            terminal = run_done.result(timeout=2.0)
+
+    assert terminal.status == "completed"
+
+
+def _sync_new_thread_scripts() -> list[SyncStreamScript]:
+    return [
+        SyncStreamScript(events=[], status=404),
+        SyncStreamScript(events=[lifecycle_completed_event(seq=1)]),
+    ]
+
+
+def test_sync_run_start_restarts_a_watcher_stopped_by_a_404_for_a_new_thread():
+    fake = SyncFakeServer()
+    fake.script_sequence(_sync_new_thread_scripts())
+    fake.set_state({"ok": True})
+    with httpx.Client(transport=fake.transport, base_url="http://test") as raw:
+        threads = SyncThreadsClient(SyncHttpClient(raw))
+        with threads.stream(thread_id="t-new", assistant_id="agent") as thread:
+            rejected = thread._run_done
+            assert rejected is not None
+            rejected.result(timeout=2.0)
+            thread.run.start(input={})
+            output = thread.output
+
+    assert output == {"ok": True}
+    assert len(fake.stream_request_bodies) == 2
+
+
+def test_sync_lifecycle_watcher_retries_a_404_that_arrives_after_run_start():
+    fake = SyncFakeServer()
+    fake.script_sequence(_sync_new_thread_scripts())
+    fake.set_state({"ok": True})
+    stream_opened = threading.Event()
+    run_started = threading.Event()
+
+    def handle(request: httpx.Request) -> httpx.Response:
+        if (
+            request.url.path.endswith("/stream/events")
+            and not fake.stream_request_bodies
+        ):
+            stream_opened.set()
+            run_started.wait(timeout=2.0)
+        return fake._handle(request)
+
+    with httpx.Client(
+        transport=httpx.MockTransport(handle), base_url="http://test"
+    ) as raw:
+        threads = SyncThreadsClient(SyncHttpClient(raw))
+        with threads.stream(thread_id="t-new", assistant_id="agent") as thread:
+            assert stream_opened.wait(timeout=2.0)
+            thread.run.start(input={})
+            run_started.set()
+            output = thread.output
+
+    assert output == {"ok": True}
+    assert len(fake.stream_request_bodies) == 2
+
+
+def test_sync_lifecycle_watcher_reports_the_error_frame_when_reconnects_run_out():
+    fake = SyncFakeServer()
+    with httpx.Client(transport=fake.transport, base_url="http://test") as raw:
+        threads = SyncThreadsClient(SyncHttpClient(raw))
+        stream = threads.stream(thread_id="t-1", assistant_id="agent")
+        stream._lifecycle_max_reconnect_attempts = 1
+        fake.script_sequence(
+            [
+                SyncStreamScript(events=[thread_stream_failed_frame()], fail_after=1)
+                for _ in range(stream._lifecycle_max_reconnect_attempts + 1)
+            ]
+        )
+        with stream as thread:
+            run_done = thread._run_done
+            assert run_done is not None
+            terminal = run_done.result(timeout=2.0)
+
+    assert (
+        str(terminal.error)
+        == "Protocol error [unknown_error]: Thread event stream failed."
+    )
+
+
+def test_sync_concurrent_run_starts_start_one_lifecycle_watcher(monkeypatch):
+    real_thread = threading.Thread
+    created_watchers: list[str] = []
+
+    class _SlowToCreateThread(real_thread):
+        def __init__(self, *args: Any, **kwargs: Any) -> None:
+            if kwargs.get("name") == "langgraph-sdk-sync-lifecycle":
+                created_watchers.append(kwargs["name"])
+                time.sleep(0.05)
+            super().__init__(*args, **kwargs)
+
+    monkeypatch.setattr(threading, "Thread", _SlowToCreateThread)
+    fake = SyncFakeServer()
+    fake.script([lifecycle_completed_event(seq=1)])
+    with httpx.Client(transport=fake.transport, base_url="http://test") as raw:
+        threads = SyncThreadsClient(SyncHttpClient(raw))
+        with threads.stream(assistant_id="agent") as thread:
+            barrier = threading.Barrier(2)
+
+            def start_run() -> None:
+                barrier.wait()
+                thread.run.start(input={})
+
+            runners = [real_thread(target=start_run) for _ in range(2)]
+            for runner in runners:
+                runner.start()
+            for runner in runners:
+                runner.join()
+
+    assert len(created_watchers) == 1
+
+
+def test_sync_reconnect_stops_on_a_404(monkeypatch):
+    monkeypatch.setattr(_ctrl_mod.time, "sleep", lambda _delay: None)
+    opened: list[dict[str, Any]] = []
+
+    class _NotFoundTransport(SyncProtocolSseTransport):
+        def open_event_stream(self, params: dict) -> SyncEventStreamHandle:
+            opened.append(params)
+            request = httpx.Request("POST", "http://test/threads/t-1/stream/events")
+            raise httpx.HTTPStatusError(
+                "not found",
+                request=request,
+                response=httpx.Response(404, request=request),
+            )
+
+    with httpx.Client(base_url="http://test") as raw:
+        transport = _NotFoundTransport(client=raw, thread_id="t-1")
+        controller = SyncStreamController(transport, max_reconnect_attempts=5)
+        controller._shared_stream_filter = {"channels": ["values"]}
+        assert controller._reconnect_shared_stream() is False
+
+    assert len(opened) == 1
@@ -1,5 +1,5 @@
 version = 1
-revision = 3
+revision = 5
 requires-python = ">=3.10"
 resolution-markers = [
    "python_full_version >= '3.15'",
@@ -301,7 +301,7 @@ wheels = [

 [[package]]
 name = "langgraph"
-version = "1.2.15"
+version = "1.2.16"
 source = { editable = "../langgraph" }
 dependencies = [
    { name = "langchain-core" },
@@ -433,7 +433,7 @@ test = [

 [[package]]
 name = "langgraph-prebuilt"
-version = "1.1.0"
+version = "1.1.1"
 source = { editable = "../prebuilt" }
 dependencies = [
    { name = "langchain-core" },
@@ -454,7 +454,7 @@ dev = [
    { name = "langgraph-checkpoint", editable = "../checkpoint" },
    { name = "langgraph-checkpoint-postgres", editable = "../checkpoint-postgres" },
    { name = "langgraph-checkpoint-sqlite", editable = "../checkpoint-sqlite" },
-    { name = "psycopg-binary" },
+    { name = "psycopg", extras = ["binary"] },
    { name = "pytest" },
    { name = "pytest-asyncio" },
    { name = "pytest-mock" },
@@ -474,7 +474,7 @@ test = [
    { name = "langgraph-checkpoint", editable = "../checkpoint" },
    { name = "langgraph-checkpoint-postgres", editable = "../checkpoint-postgres" },
    { name = "langgraph-checkpoint-sqlite", editable = "../checkpoint-sqlite" },
-    { name = "psycopg-binary" },
+    { name = "psycopg", extras = ["binary"] },
    { name = "pytest" },
    { name = "pytest-asyncio" },
    { name = "pytest-mock" },