test(langgraph): skip async interrupt tests on Python 3.10

Fixes #6956
Fixes #8579

When parallel tasks interrupt, resuming one leaves its old `__interrupt__`
write in the open superstep. `get_state()` treated that write as pending
even after the task finished, so the answered question reappeared.

Use `read_task_statuses()` for execution, state reads, and resume checks.
An output write marks a task finished; `RESUME` alone does not, because
the task may have interrupted again. Record `NO_WRITES` when a resumed
task completes without output, so it isn't run again.

Latest-state reads now omit interrupts from finished tasks. History and
explicit checkpoint reads still show the last recorded interrupt per
task. A task paused at its second interrupt appears in `next` with
`result=None`. `Command(resume=value)` without an id now raises when
more than one interrupt is pending, including in a subgraph.

Older checkpoints where a resumed task finished without output may
still appear unfinished. On SQLite and Postgres, insert-ignore can
leave an old `RESUME` value for a finished task; that task does not
run again.

Tests: `tests/test_interrupt_state.py` (sync and async).
`make format`, `make lint`; memory/SQLite: 2075 passed, 4 skipped;
Postgres 16: 3659 passed, 6 skipped.

libs/cli/README.md

@@ -103,6 +103,8 @@ The CLI uses a `langgraph.json` configuration file with these key settings:
 }
 ```
 
+Git dependencies should use credential-free URLs. The CLI conservatively scans direct `langgraph.json` dependencies, common Python package files, uv project and lock files, and common Node.js package and lock files for HTTP Git URLs with userinfo. This check is not exhaustive: generated Docker builds can copy other files, including nested requirement or constraint files, into image layers without scanning them. For private dependencies, provide short-lived credentials through your build environment's secret-backed Git credential helper. Do not store credentials in copied files such as `langgraph.json` or `pip_config_file`.
+
 See the [full documentation](https://reference.langchain.com/python/langgraph-cli) for detailed configuration options.
 
 ## Development

libs/cli/langgraph_cli/config.py

@@ -6,6 +6,7 @@ import re
 import shlex
 import textwrap
 from collections import Counter
+from collections.abc import Iterable
 from typing import Literal, NamedTuple
 
 import click
@@ -36,6 +37,10 @@ DISALLOWED_BUILD_COMMAND_CHARS = [
 # This blocks background execution (cmd &) while allowing command
 # chaining (cmd1 && cmd2) which is common in build commands.
 _SINGLE_AMPERSAND_RE = re.compile(r"(?<!&)&(?:&&)*(?!&)")
+_GIT_HTTP_AUTHORITY_RES = (
+    re.compile(r"git\+https?://(?P<authority>[^/\s\"']+)", re.I),
+    re.compile(r"\bgit\s*=\s*[\"']https?://(?P<authority>[^/\s\"']+)", re.I),
+)
 _API_VERSION_PATTERN = re.compile(
     r"^(?P<major>\d+)"
     r"(?:\.(?P<minor>\d+))?"
@@ -78,6 +83,62 @@ def has_disallowed_build_command_content(command: str) -> bool:
     return False
 
 
+def _has_git_http_url_userinfo(dependency: str) -> bool:
+    """Check whether a Git HTTP URL contains userinfo."""
+    return any(
+        "@" in match.group("authority")
+        for pattern in _GIT_HTTP_AUTHORITY_RES
+        for match in pattern.finditer(dependency)
+    )
+
+
+def _validate_git_http_url_userinfo(
+    values: Iterable[str], *, source: pathlib.Path | None = None
+) -> None:
+    """Reject credential-bearing Git HTTP URLs without echoing their values."""
+    if not any(_has_git_http_url_userinfo(value) for value in values):
+        return
+    message = (
+        "Git dependency URLs must not contain credentials or other URL "
+        "userinfo because generated Dockerfiles and image layers can retain "
+        "them. Use a credential-free Git URL and provide short-lived "
+        "credentials through your build environment's secret-backed Git "
+        "credential helper."
+    )
+    if source is not None:
+        message += f" Found in: {source}"
+    raise click.UsageError(message)
+
+
+def _validate_git_http_url_userinfo_files(paths: Iterable[pathlib.Path]) -> None:
+    """Reject credential-bearing Git HTTP URLs in dependency files."""
+    for path in paths:
+        path = path.resolve()
+        if not path.is_file():
+            continue
+        try:
+            contents = path.read_text(encoding="utf-8", errors="replace")
+        except OSError:
+            raise click.UsageError(
+                f"Could not inspect dependency file for embedded credentials: {path}"
+            ) from None
+        _validate_git_http_url_userinfo([contents], source=path)
+
+
+def _validate_local_dependency_files(config_path: pathlib.Path, config: Config) -> None:
+    """Validate dependency files copied into a non-uv Python image."""
+    paths: list[pathlib.Path] = []
+    for dependency in config["dependencies"]:
+        if not isinstance(dependency, str) or not dependency.startswith("."):
+            continue
+        root = (config_path.parent / dependency).resolve()
+        paths.extend(
+            root / name
+            for name in ("requirements.txt", "pyproject.toml", "setup.py", "setup.cfg")
+        )
+    _validate_git_http_url_userinfo_files(paths)
+
+
 MIN_PYTHON_VERSION = "3.11"
 DEFAULT_PYTHON_VERSION = "3.11"
 
@@ -320,7 +381,9 @@ def _get_source_kind(config: Config) -> str | None:
     return kind if isinstance(kind, str) else None
 
 
-def validate_config(config: Config) -> Config:
+def validate_config(
+    config: Config, *, source_path: pathlib.Path | None = None
+) -> Config:
     """Validate a configuration dictionary."""
 
     graphs = config.get("graphs", {})
@@ -415,6 +478,15 @@ def validate_config(config: Config) -> Config:
                 '  "source": {"kind": "uv", "root": ".."}'
             )
 
+    _validate_git_http_url_userinfo(
+        (
+            dependency
+            for dependency in config["dependencies"]
+            if isinstance(dependency, str)
+        ),
+        source=source_path,
+    )
+
     source = config.get("source")
     source_kind = _get_source_kind(config)
     if source is not None and not isinstance(source, dict):
@@ -609,7 +681,7 @@ def validate_config_file(config_path: pathlib.Path) -> Config:
     """Load and validate a configuration file."""
     with open(config_path) as f:
         config = json.load(f)
-    validated = validate_config(config)
+    validated = validate_config(config, source_path=config_path.resolve())
     # Enforce the package.json doesn't enforce an
     # incompatible Node.js version
     if validated.get("node_version"):
@@ -1280,6 +1352,7 @@ def python_config_to_docker(
             api_version=api_version,
             build_tools_to_uninstall=build_tools_to_uninstall,
         )
+    _validate_local_dependency_files(config_path, config)
     if pip_installer == "auto":
         if _image_supports_uv(base_image):
             pip_installer = "uv"
@@ -1490,7 +1563,18 @@ def node_config_to_docker(
 ) -> tuple[str, dict[str, str]]:
     # Calculate paths for monorepo support
     install_root = (
-        pathlib.Path(build_context).resolve() if build_context else config_path.parent
+        pathlib.Path(build_context).resolve()
+        if build_context
+        else config_path.parent.resolve()
+    )
+    config_root = config_path.parent.resolve()
+    dependency_roots = (
+        (install_root, config_root) if install_root != config_root else (install_root,)
+    )
+    _validate_git_http_url_userinfo_files(
+        root / name
+        for root in dependency_roots
+        for name in ("package.json", "package-lock.json", "yarn.lock", "pnpm-lock.yaml")
     )
     install_cmd = install_command or _get_node_pm_install_cmd(install_root)
     if build_context:

libs/cli/langgraph_cli/deploy.py

@@ -12,7 +12,6 @@ from collections.abc import Callable, Mapping, Sequence
 from contextlib import contextmanager
 from dataclasses import asdict, dataclass, field
 from datetime import datetime, timezone
-from functools import partial
 from typing import Protocol, TypeVar
 
 import click
@@ -1918,8 +1917,7 @@ OPT_AGENT_ID = click.option(
     help="Logical agent ID (requires agent mode enabled for the tenant).",
 )
 
-OPT_AGENT_ENVIRONMENT = partial(
-    click.option,
+OPT_AGENT_ENVIRONMENT = click.option(
     "--agent-environment",
     "environment",
     envvar="LANGSMITH_AGENT_ENVIRONMENT",
@@ -2027,9 +2025,7 @@ def _deploy_base_options(
             OPT_HOST_API_KEY,
             OPT_HOST_DEPLOYMENT_NAME,
             OPT_AGENT_ID,
-            OPT_AGENT_ENVIRONMENT()
-            if include_docker_args
-            else OPT_AGENT_ENVIRONMENT(type=str),
+            OPT_AGENT_ENVIRONMENT,
             click.option(
                 "--deployment-id",
                 help=(
@@ -2176,12 +2172,6 @@ def deploy(ctx: click.Context, **_: object):
     # otherwise, we return None here and click will proceed to actually run the subcommand (list or delete)
     if ctx.invoked_subcommand is not None:
         return
-    environment_param = next(
-        param for param in _deploy_cmd.params if param.name == "environment"
-    )
-    ctx.params["environment"] = environment_param.type_cast_value(
-        ctx, ctx.params["environment"]
-    )
     if (
         ctx.params.get("agent_id") is not None
         or ctx.params.get("environment") is not None
@@ -2381,7 +2371,7 @@ def _deploy_cmd(
 @OPT_HOST_API_KEY
 @OPT_HOST_URL
 @OPT_AGENT_ID
-@OPT_AGENT_ENVIRONMENT()
+@OPT_AGENT_ENVIRONMENT
 @click.option(
     "--name-contains",
     default="",

libs/cli/langgraph_cli/schemas.py

@@ -650,7 +650,8 @@ class Config(TypedDict, total=False):
 
     pip_config_file: str | None
     """Optional. Path to a pip config file (e.g., "/etc/pip.conf" or "pip.ini") for controlling
-    package installation (custom indices, credentials, etc.).
+    package installation (custom indices, timeouts, etc.). The file is copied into the
+    generated image, so it must not contain credentials or other secrets.
 
     Only relevant if Python dependencies are installed via pip. If omitted, default pip settings are used.
     """
@@ -689,6 +690,9 @@ class Config(TypedDict, total=False):
       - "." or "./src" if you have a local Python package
       - str (aka "anthropic") for a PyPI package
       - "git+https://github.com/org/repo.git@main" for a Git-based package
+    Git HTTP URLs must not contain userinfo such as a username or token. For private
+    dependencies, provide short-lived credentials through the build environment's
+    secret-backed Git credential helper.
     Defaults to an empty list, meaning no additional packages installed beyond your base environment.
 
     This field is not supported when `source.kind` is `uv`.

libs/cli/langgraph_cli/uv_lock.py

@@ -880,6 +880,7 @@ def python_config_to_docker_uv_lock(
         _get_node_pm_install_cmd,
         _get_pip_cleanup_lines,
         _image_supports_uv,
+        _validate_git_http_url_userinfo_files,
         docker_tag,
     )
 
@@ -890,11 +891,20 @@ def python_config_to_docker_uv_lock(
         )
 
     config_root = config_path.parent.resolve()
+    source_root = config["source"].get("root", ".")
+    project_root = (config_root / source_root).resolve()
+    _validate_git_http_url_userinfo_files(
+        [project_root / "pyproject.toml", project_root / "uv.lock"]
+    )
+
     install_cmd = "uv pip install --system"
     _, global_reqs_pip_install, pip_config_file_str = _build_python_install_commands(
         config, install_cmd
     )
     plan = _plan_uv_lock_workspace(config_path, config)
+    _validate_git_http_url_userinfo_files(
+        package.pyproject_path for package in plan.install_order
+    )
 
     _update_uv_lock_graph_paths(config_path, config, plan)
     for section, key in [

libs/cli/schemas/schema.json

@@ -28,7 +28,7 @@
                   "type": "null"
                 }
               ],
-              "description": "Optional. Path to a pip config file (e.g., \"/etc/pip.conf\" or \"pip.ini\") for controlling\npackage installation (custom indices, credentials, etc.).\n\nOnly relevant if Python dependencies are installed via pip. If omitted, default pip settings are used.\n"
+              "description": "Optional. Path to a pip config file (e.g., \"/etc/pip.conf\" or \"pip.ini\") for controlling\npackage installation (custom indices, timeouts, etc.). The file is copied into the\ngenerated image, so it must not contain credentials or other secrets.\n\nOnly relevant if Python dependencies are installed via pip. If omitted, default pip settings are used.\n"
             },
             "_INTERNAL_docker_tag": {
               "anyOf": [
@@ -270,7 +270,7 @@
                   "type": "null"
                 }
               ],
-              "description": "Optional. Path to a pip config file (e.g., \"/etc/pip.conf\" or \"pip.ini\") for controlling\npackage installation (custom indices, credentials, etc.).\n\nOnly relevant if Python dependencies are installed via pip. If omitted, default pip settings are used.\n"
+              "description": "Optional. Path to a pip config file (e.g., \"/etc/pip.conf\" or \"pip.ini\") for controlling\npackage installation (custom indices, timeouts, etc.). The file is copied into the\ngenerated image, so it must not contain credentials or other secrets.\n\nOnly relevant if Python dependencies are installed via pip. If omitted, default pip settings are used.\n"
             },
             "_INTERNAL_docker_tag": {
               "anyOf": [

libs/cli/schemas/schema.v0.json

@@ -28,7 +28,7 @@
                   "type": "null"
                 }
               ],
-              "description": "Optional. Path to a pip config file (e.g., \"/etc/pip.conf\" or \"pip.ini\") for controlling\npackage installation (custom indices, credentials, etc.).\n\nOnly relevant if Python dependencies are installed via pip. If omitted, default pip settings are used.\n"
+              "description": "Optional. Path to a pip config file (e.g., \"/etc/pip.conf\" or \"pip.ini\") for controlling\npackage installation (custom indices, timeouts, etc.). The file is copied into the\ngenerated image, so it must not contain credentials or other secrets.\n\nOnly relevant if Python dependencies are installed via pip. If omitted, default pip settings are used.\n"
             },
             "_INTERNAL_docker_tag": {
               "anyOf": [
@@ -270,7 +270,7 @@
                   "type": "null"
                 }
               ],
-              "description": "Optional. Path to a pip config file (e.g., \"/etc/pip.conf\" or \"pip.ini\") for controlling\npackage installation (custom indices, credentials, etc.).\n\nOnly relevant if Python dependencies are installed via pip. If omitted, default pip settings are used.\n"
+              "description": "Optional. Path to a pip config file (e.g., \"/etc/pip.conf\" or \"pip.ini\") for controlling\npackage installation (custom indices, timeouts, etc.). The file is copied into the\ngenerated image, so it must not contain credentials or other secrets.\n\nOnly relevant if Python dependencies are installed via pip. If omitted, default pip settings are used.\n"
             },
             "_INTERNAL_docker_tag": {
               "anyOf": [

libs/cli/tests/unit_tests/test_config.py

@@ -255,6 +255,243 @@ def test_validate_config():
         )
 
 
+@pytest.mark.parametrize(
+    "dependency",
+    [
+        "git+https://user:secret-token@github.com/org/private.git@main",
+        "private-package @ git+http://token@github.com/org/private.git",
+        "git+HTTPS://user%40example.com:secret%2Ftoken@github.com/org/private.git",
+        "git+https://${GIT_TOKEN}@github.com/org/private.git",
+    ],
+)
+def test_validate_config_rejects_git_http_url_userinfo(dependency: str):
+    with pytest.raises(click.UsageError) as exc_info:
+        validate_config(
+            {
+                "python_version": "3.11",
+                "dependencies": [dependency],
+                "graphs": {"agent": "./agent.py:graph"},
+            }
+        )
+
+    message = str(exc_info.value)
+    assert "must not contain credentials or other URL userinfo" in message
+    assert "secret-token" not in message
+    assert "secret%2Ftoken" not in message
+
+
+def test_validate_config_file_reports_source_for_git_http_url_userinfo(
+    tmp_path: pathlib.Path,
+):
+    config_path = tmp_path / "langgraph.json"
+    config_path.write_text(
+        json.dumps(
+            {
+                "python_version": "3.11",
+                "dependencies": ["git+https://secret-token@github.com/org/private.git"],
+                "graphs": {"agent": "./agent.py:graph"},
+            }
+        )
+    )
+
+    with pytest.raises(click.UsageError) as exc_info:
+        validate_config_file(config_path)
+
+    message = str(exc_info.value)
+    assert "secret-token" not in message
+    assert f"Found in: {config_path.resolve()}" in message
+
+
+@pytest.mark.parametrize(
+    "manifest", ["package.json", "package-lock.json", "yarn.lock", "pnpm-lock.yaml"]
+)
+def test_config_to_docker_rejects_git_http_url_userinfo_in_node_files(
+    tmp_path: pathlib.Path, manifest: str
+):
+    config_path = tmp_path / "langgraph.json"
+    config_path.write_text("{}\n")
+    (tmp_path / "agent.js").write_text("export const graph = {};\n")
+    (tmp_path / "package.json").write_text('{"name":"agent"}\n')
+    (tmp_path / manifest).write_text(
+        '"priv": "git+https://user:secret-token@github.com/org/private.git"\n'
+    )
+    config = validate_config(
+        {
+            "node_version": "20",
+            "graphs": {"agent": "./agent.js:graph"},
+        }
+    )
+
+    with pytest.raises(click.UsageError) as exc_info:
+        config_to_docker(
+            config_path,
+            config,
+            base_image="langchain/langgraphjs-api",
+        )
+
+    message = str(exc_info.value)
+    assert "must not contain credentials or other URL userinfo" in message
+    assert "secret-token" not in message
+    assert f"Found in: {(tmp_path / manifest).resolve()}" in message
+
+
+def test_config_to_docker_allows_node_git_urls_without_http_userinfo(
+    tmp_path: pathlib.Path,
+):
+    config_path = tmp_path / "langgraph.json"
+    config_path.write_text("{}\n")
+    (tmp_path / "agent.js").write_text("export const graph = {};\n")
+    (tmp_path / "package.json").write_text(
+        '{"dependencies":{"public":"git+https://github.com/org/public.git"}}\n'
+    )
+    config = validate_config(
+        {
+            "node_version": "20",
+            "graphs": {"agent": "./agent.js:graph"},
+        }
+    )
+
+    docker, _ = config_to_docker(
+        config_path,
+        config,
+        base_image="langchain/langgraphjs-api",
+    )
+
+    assert f"ADD . /deps/{tmp_path.name}" in docker
+
+
+def test_config_to_docker_rejects_git_http_url_userinfo_in_node_workspace(
+    tmp_path: pathlib.Path,
+):
+    config_root = tmp_path / "apps" / "agent"
+    config_root.mkdir(parents=True)
+    config_path = config_root / "langgraph.json"
+    config_path.write_text("{}\n")
+    (config_root / "agent.js").write_text("export const graph = {};\n")
+    (config_root / "package.json").write_text(
+        '{"dependencies":{"priv":"git+https://secret-token@github.com/org/private.git"}}\n'
+    )
+    (tmp_path / "package.json").write_text('{"name":"workspace"}\n')
+    config = validate_config(
+        {
+            "node_version": "20",
+            "graphs": {"agent": "./agent.js:graph"},
+        }
+    )
+
+    with pytest.raises(click.UsageError) as exc_info:
+        config_to_docker(
+            config_path,
+            config,
+            base_image="langchain/langgraphjs-api",
+            build_context=str(tmp_path),
+        )
+
+    message = str(exc_info.value)
+    assert "secret-token" not in message
+    assert f"Found in: {(config_root / 'package.json').resolve()}" in message
+
+
+@pytest.mark.parametrize(
+    "dependency",
+    [
+        "git+https://github.com/org/public.git@main",
+        "private-package @ git+https://github.com/org/private.git@main",
+        "git+ssh://git@github.com/org/private.git@main",
+    ],
+)
+def test_validate_config_allows_git_urls_without_http_userinfo(dependency: str):
+    config = validate_config(
+        {
+            "python_version": "3.11",
+            "dependencies": [dependency],
+            "graphs": {"agent": "./agent.py:graph"},
+        }
+    )
+
+    assert config["dependencies"] == [dependency]
+
+
+def test_config_to_docker_rejects_git_http_url_userinfo_in_requirements(
+    tmp_path: pathlib.Path,
+):
+    config_path = tmp_path / "langgraph.json"
+    config_path.write_text("{}\n")
+    (tmp_path / "agent.py").write_text("graph = object()\n")
+    (tmp_path / "requirements.txt").write_text(
+        "private @ git+https://secret-token@github.com/org/private.git\n"
+    )
+    config = validate_config(
+        {
+            "python_version": "3.11",
+            "dependencies": ["."],
+            "graphs": {"agent": "./agent.py:graph"},
+        }
+    )
+
+    with pytest.raises(click.UsageError) as exc_info:
+        config_to_docker(
+            config_path,
+            config,
+            base_image="langchain/langgraph-api:0.2.47",
+        )
+
+    message = str(exc_info.value)
+    assert "must not contain credentials or other URL userinfo" in message
+    assert "secret-token" not in message
+    assert f"Found in: {(tmp_path / 'requirements.txt').resolve()}" in message
+
+
+@pytest.mark.parametrize("manifest", ["pyproject.toml", "uv.lock"])
+def test_config_to_docker_rejects_git_http_url_userinfo_in_uv_files(
+    tmp_path: pathlib.Path, manifest: str
+):
+    config_path = tmp_path / "langgraph.json"
+    config_path.write_text("{}\n")
+    (tmp_path / "src").mkdir()
+    (tmp_path / "src" / "agent.py").write_text("graph = object()\n")
+    pyproject = textwrap.dedent(
+        """
+        [project]
+        name = "agent"
+        version = "0.1.0"
+        dependencies = ["private"]
+
+        [tool.uv.sources]
+        private = { git = "https://github.com/org/private.git" }
+        """
+    ).strip()
+    uv_lock = "# uv lock file\n"
+    if manifest == "pyproject.toml":
+        pyproject = pyproject.replace(
+            "https://github.com", "https://secret-token@github.com"
+        )
+    else:
+        uv_lock += (
+            'source = { git = "https://secret-token@github.com/org/private.git" }\n'
+        )
+    (tmp_path / "pyproject.toml").write_text(pyproject + "\n")
+    (tmp_path / "uv.lock").write_text(uv_lock)
+    config = validate_config(
+        {
+            "python_version": "3.11",
+            "graphs": {"agent": "./src/agent.py:graph"},
+            "source": {"kind": "uv"},
+        }
+    )
+
+    with pytest.raises(click.UsageError) as exc_info:
+        config_to_docker(
+            config_path,
+            config,
+            base_image="langchain/langgraph-api:0.2.47",
+        )
+
+    message = str(exc_info.value)
+    assert "must not contain credentials or other URL userinfo" in message
+    assert "secret-token" not in message
+
+
 def test_validate_config_image_distro():
     """Test validation of image_distro field."""
     # Valid image_distro values should work

libs/langgraph/langgraph/pregel/_loop.py

@@ -119,6 +119,7 @@ from langgraph.pregel._io import (
 )
 from langgraph.pregel._messages import ensure_message_ids
 from langgraph.pregel._read import PregelNode
+from langgraph.pregel._task_status import read_task_statuses
 from langgraph.pregel._utils import get_new_channel_versions, is_xxh3_128_hexdigest
 from langgraph.pregel.debug import (
     map_debug_checkpoint,
@@ -736,17 +737,14 @@ class PregelLoop:
     def _reapply_writes_to_succeeded_nodes(
         self, tasks: Mapping[str, PregelExecutableTask]
     ) -> None:
-        """Restore successful channel writes from checkpoint to in-memory tasks.
+        """Restore the output of finished tasks from checkpoint to in-memory tasks.
 
-        Skips control signals (ERROR, ERROR_SOURCE_NODE, INTERRUPT, RESUME)
-        so that failed/interrupted tasks remain with empty writes and will be
-        re-executed (or routed to error handlers) by the runner.
+        Unfinished (failed or interrupted) tasks keep empty writes, so the
+        runner re-executes them or routes them to error handlers.
         """
-        for tid, k, v in self.checkpoint_pending_writes:
-            if k in (ERROR, ERROR_SOURCE_NODE, INTERRUPT, RESUME):
-                continue
+        for tid, status in read_task_statuses(self.checkpoint_pending_writes).items():
             if task := tasks.get(tid):
-                task.writes.append((k, v))
+                task.writes.extend(status.output)
 
     def _resume_error_handlers_if_applicable(self) -> None:
         """On resume, schedule error handlers for tasks that failed in a prior run.
@@ -816,35 +814,13 @@ class PregelLoop:
                 self.tasks[handler_task.id] = handler_task
 
     def _pending_interrupts(self) -> set[str]:
-        """Return the set of interrupt ids that are pending without corresponding resume values."""
-        # mapping of task ids to interrupt ids
-        pending_interrupts: dict[str, str] = {}
-
-        # set of resume task ids
-        pending_resumes: set[str] = set()
-
-        for task_id, write_type, value in self.checkpoint_pending_writes:
-            if write_type == INTERRUPT:
-                # interrupts is always a list, but there should only be one element
-                pending_interrupts[task_id] = value[0].id
-            elif write_type == RESUME:
-                pending_resumes.add(task_id)
-
-        resumed_interrupt_ids = {
-            pending_interrupts[task_id]
-            for task_id in pending_resumes
-            if task_id in pending_interrupts
+        """Return the ids of interrupts that are still waiting for an answer."""
+        return {
+            interrupt.id
+            for status in read_task_statuses(self.checkpoint_pending_writes).values()
+            for interrupt in status.pending_interrupts
         }
 
-        # Keep only interrupts whose interrupt_id is not resumed
-        hanging_interrupts: set[str] = {
-            interrupt_id
-            for interrupt_id in pending_interrupts.values()
-            if interrupt_id not in resumed_interrupt_ids
-        }
-
-        return hanging_interrupts
-
     def _first(
         self, *, input_keys: str | Sequence[str], updated_channels: set[str] | None
     ) -> set[str] | None:

libs/langgraph/langgraph/pregel/_runner.py

@@ -45,6 +45,7 @@ from langgraph.errors import GraphBubbleUp, GraphInterrupt
 from langgraph.pregel._algo import Call
 from langgraph.pregel._executor import Submit
 from langgraph.pregel._retry import arun_with_retry, run_with_retry
+from langgraph.pregel._task_status import CONTROL_WRITES
 from langgraph.types import (
     CachePolicy,
     PregelExecutableTask,
@@ -606,8 +607,9 @@ class PregelRunner:
                 task.config is None or TAG_HIDDEN not in task.config.get("tags", [])
             ):
                 self.node_finished(task.name)
-            if not task.writes:
-                # add no writes marker
+            if all(chan in CONTROL_WRITES for chan, _ in task.writes):
+                # record that the task finished, even if it produced no output
+                # (see `langgraph.pregel._task_status`)
                 task.writes.append((NO_WRITES, None))
             # save task writes to checkpointer
             self.put_writes()(task.id, task.writes)  # type: ignore[misc]

libs/langgraph/langgraph/pregel/_task_status.py

@@ -0,0 +1,127 @@
+"""Read the status of each task from the writes recorded for a superstep.
+
+While a superstep is open, the checkpointer keeps a log of writes for each
+task in that step. Entries are added as tasks run and are only discarded when
+the whole superstep finishes and a new checkpoint is saved. When a task runs
+again, for example after being resumed, its earlier entries stay in the log.
+
+This module is the single place that turns that log into task status. Code that
+needs to know whether a task finished, which interrupts it raised, which of them
+are still waiting for an answer, or which output it produced must use
+`read_task_statuses` instead of inspecting the writes directly.
+
+The log uses two kinds of writes:
+
+- Control writes describe what happened to a task: `INTERRUPT` (the task asked
+  a question), `RESUME` (answers the task has received), `ERROR`, and
+  `ERROR_SOURCE_NODE`. `INTERRUPT`, `RESUME` and `ERROR` each have a fixed slot
+  per task (`WRITES_IDX_MAP`), so a newer write of the same kind can replace an
+  older one.
+- Every other write is output: channel writes, `RETURN` for functional tasks,
+  and the `NO_WRITES` marker.
+
+The rules are:
+
+1. When a task that ran finishes successfully, `PregelRunner.commit` records at
+   least one output write, adding `NO_WRITES` if the task produced no other
+   output.
+2. A task that pauses at an interrupt records only control writes.
+3. A task is therefore treated as finished if and only if it has an output
+   write.
+4. Because `INTERRUPT` is stored in a fixed slot, its recorded value is the most
+   recent question the task asked. That question is waiting for an answer only
+   while the task is unfinished.
+
+A `RESUME` write never means a task is finished: it can hold the answer to an
+earlier question while the task waits on a later one.
+
+What these rules cannot see:
+
+- A task whose result came from the cache does not go through
+  `PregelRunner.commit`, so nothing is recorded for it. It reads as not
+  finished.
+- A task that fails can record partial output writes along with its error. It
+  reads as finished, which is how the executor has always treated it.
+- Writes recorded before rule 1 existed may describe a finished task with no
+  output using only control writes. Those tasks read as unfinished, which
+  matches how they were treated before.
+"""
+
+from __future__ import annotations
+
+from collections.abc import Iterable, Sequence
+from dataclasses import dataclass
+from typing import Any
+
+from langgraph.checkpoint.base import PendingWrite
+
+from langgraph._internal._constants import (
+    ERROR,
+    ERROR_SOURCE_NODE,
+    INTERRUPT,
+    NULL_TASK_ID,
+    RESUME,
+)
+from langgraph.types import Interrupt
+
+__all__ = ("CONTROL_WRITES", "TaskStatus", "read_task_statuses")
+
+CONTROL_WRITES = frozenset((ERROR, ERROR_SOURCE_NODE, INTERRUPT, RESUME))
+"""Channels that describe what happened to a task rather than what it produced."""
+
+
+@dataclass(frozen=True, slots=True)
+class TaskStatus:
+    """The status of one task, read from the writes recorded for its superstep."""
+
+    output: tuple[tuple[str, Any], ...] = ()
+    """Output writes in recorded order. Empty if the task has not finished."""
+
+    interrupts: tuple[Interrupt, ...] = ()
+    """The most recent interrupts the task raised, whether or not they were answered."""
+
+    error: BaseException | None = None
+    """The recorded error, if any."""
+
+    @property
+    def finished(self) -> bool:
+        """Whether the task ran to completion."""
+        return bool(self.output)
+
+    @property
+    def pending_interrupts(self) -> tuple[Interrupt, ...]:
+        """Interrupts waiting for an answer. Always empty for a finished task."""
+        return () if self.finished else self.interrupts
+
+
+def read_task_statuses(
+    pending_writes: Iterable[PendingWrite],
+) -> dict[str, TaskStatus]:
+    """Return the status of every task that has recorded writes, keyed by task id.
+
+    Writes from `NULL_TASK_ID` are input to the superstep, not task activity, so
+    they are not included.
+    """
+    output: dict[str, list[tuple[str, Any]]] = {}
+    interrupts: dict[str, list[Interrupt]] = {}
+    errors: dict[str, BaseException] = {}
+    for task_id, channel, value in pending_writes:
+        if task_id == NULL_TASK_ID:
+            continue
+        output.setdefault(task_id, [])
+        if channel == INTERRUPT:
+            interrupts.setdefault(task_id, []).extend(
+                value if isinstance(value, Sequence) else [value]
+            )
+        elif channel == ERROR:
+            errors.setdefault(task_id, value)
+        elif channel not in CONTROL_WRITES:
+            output[task_id].append((channel, value))
+    return {
+        task_id: TaskStatus(
+            output=tuple(task_output),
+            interrupts=tuple(interrupts.get(task_id, ())),
+            error=errors.get(task_id),
+        )
+        for task_id, task_output in output.items()
+    }

libs/langgraph/langgraph/pregel/debug.py

@@ -26,6 +26,7 @@ from langgraph._internal._typing import MISSING
 from langgraph.channels.base import BaseChannel
 from langgraph.constants import TAG_HIDDEN
 from langgraph.pregel._io import read_channels
+from langgraph.pregel._task_status import TaskStatus, read_task_statuses
 from langgraph.types import (
     CheckpointPayload,
     PregelExecutableTask,
@@ -37,6 +38,8 @@ from langgraph.types import (
 
 TASK_NAMESPACE = UUID("6ba7b831-9dad-11d1-80b4-00c04fd430c8")
 
+_NOT_STARTED = TaskStatus()
+
 
 def map_debug_tasks(tasks: Iterable[PregelExecutableTask]) -> Iterator[TaskPayload]:
     """Produce "task" events for stream_mode=debug."""
@@ -211,35 +214,21 @@ def tasks_w_writes(
     pending_writes: list[PendingWrite] | None,
     states: dict[str, RunnableConfig | StateSnapshot] | None,
     output_keys: str | Sequence[str],
+    *,
+    live: bool = False,
 ) -> tuple[PregelTask, ...]:
-    """Apply writes / subgraph states to tasks to be returned in a StateSnapshot."""
-    pending_writes = pending_writes or []
+    """Apply writes / subgraph states to tasks to be returned in a StateSnapshot.
+
+    With `live=True`, tasks report only the interrupts still waiting for an
+    answer, as of the most recent writes. Otherwise tasks report the interrupts
+    they raised in the step, including answered ones, as a record of the step.
+    """
+    statuses = read_task_statuses(pending_writes or [])
     out: list[PregelTask] = []
     for task in tasks:
-        rtn = next(
-            (
-                val
-                for tid, chan, val in pending_writes
-                if tid == task.id and chan == RETURN
-            ),
-            MISSING,
-        )
-        task_error = next(
-            (exc for tid, n, exc in pending_writes if tid == task.id and n == ERROR),
-            None,
-        )
-        task_interrupts = tuple(
-            v
-            for tid, n, vv in pending_writes
-            if tid == task.id and n == INTERRUPT
-            for v in (vv if isinstance(vv, Sequence) else [vv])
-        )
-
-        task_writes = [
-            (chan, val)
-            for tid, chan, val in pending_writes
-            if tid == task.id and chan not in (ERROR, INTERRUPT, RETURN)
-        ]
+        status = statuses.get(task.id, _NOT_STARTED)
+        rtn = next((val for chan, val in status.output if chan == RETURN), MISSING)
+        task_writes = [(chan, val) for chan, val in status.output if chan != RETURN]
 
         if rtn is not MISSING:
             task_result = rtn
@@ -261,19 +250,15 @@ def tasks_w_writes(
             mapped_writes = map_task_result_writes(filtered_writes)
             task_result = mapped_writes if filtered_writes else {}
 
-        has_writes = rtn is not MISSING or any(
-            w[0] == task.id and w[1] not in (ERROR, INTERRUPT) for w in pending_writes
-        )
-
         out.append(
             PregelTask(
                 task.id,
                 task.name,
                 task.path,
-                task_error,
-                task_interrupts,
+                status.error,
+                status.pending_interrupts if live else status.interrupts,
                 states.get(task.id) if states else None,
-                task_result if has_writes else None,
+                task_result if status.finished else None,
             )
         )
     return tuple(out)

libs/langgraph/langgraph/pregel/main.py

@@ -79,7 +79,6 @@ from langgraph._internal._constants import (
     CONFIG_KEY_STREAM_MESSAGES_V2,
     CONFIG_KEY_TASK_ID,
     CONFIG_KEY_THREAD_ID,
-    ERROR,
     INPUT,
     INTERRUPT,
     NS_END,
@@ -149,6 +148,7 @@ from langgraph.pregel._messages import (
 from langgraph.pregel._read import DEFAULT_BOUND, PregelNode
 from langgraph.pregel._retry import RetryPolicy
 from langgraph.pregel._runner import PregelRunner
+from langgraph.pregel._task_status import read_task_statuses
 from langgraph.pregel._tools import StreamToolCallHandler
 from langgraph.pregel._utils import (
     get_new_channel_versions,
@@ -1147,8 +1147,16 @@ class Pregel(
         config: RunnableConfig,
         saved: CheckpointTuple | None,
         recurse: BaseCheckpointSaver | None = None,
-        apply_pending_writes: bool = False,
+        live: bool = False,
     ) -> StateSnapshot:
+        """Build a `StateSnapshot` from a saved checkpoint and its pending writes.
+
+        With `live=True` the snapshot shows current status: values include the
+        output of tasks that already finished, `next` lists only tasks that still
+        need to run, and `interrupts` lists only questions still waiting for an
+        answer. Otherwise the snapshot is a record of the step: values as of the
+        start of the step, every task in the step, and the interrupts they raised.
+        """
         if not saved:
             return StateSnapshot(
                 values={},
@@ -1236,13 +1244,10 @@ class Pregel(
                 None,
                 self.trigger_to_nodes,
             )
-        if apply_pending_writes and saved.pending_writes:
-            for tid, k, v in saved.pending_writes:
-                if k in (ERROR, INTERRUPT):
-                    continue
-                if tid not in next_tasks:
-                    continue
-                next_tasks[tid].writes.append((k, v))
+        if live and saved.pending_writes:
+            for tid, status in read_task_statuses(saved.pending_writes).items():
+                if tid in next_tasks:
+                    next_tasks[tid].writes.extend(status.output)
             if tasks := [t for t in next_tasks.values() if t.writes]:
                 apply_writes(
                     saved.checkpoint, channels, tasks, None, self.trigger_to_nodes
@@ -1252,6 +1257,7 @@ class Pregel(
             saved.pending_writes,
             task_states,
             self.stream_channels_asis,
+            live=live,
         )
         # assemble the state snapshot
         return StateSnapshot(
@@ -1270,8 +1276,16 @@ class Pregel(
         config: RunnableConfig,
         saved: CheckpointTuple | None,
         recurse: BaseCheckpointSaver | None = None,
-        apply_pending_writes: bool = False,
+        live: bool = False,
     ) -> StateSnapshot:
+        """Build a `StateSnapshot` from a saved checkpoint and its pending writes.
+
+        With `live=True` the snapshot shows current status: values include the
+        output of tasks that already finished, `next` lists only tasks that still
+        need to run, and `interrupts` lists only questions still waiting for an
+        answer. Otherwise the snapshot is a record of the step: values as of the
+        start of the step, every task in the step, and the interrupts they raised.
+        """
         if not saved:
             return StateSnapshot(
                 values={},
@@ -1359,13 +1373,10 @@ class Pregel(
                 None,
                 self.trigger_to_nodes,
             )
-        if apply_pending_writes and saved.pending_writes:
-            for tid, k, v in saved.pending_writes:
-                if k in (ERROR, INTERRUPT):
-                    continue
-                if tid not in next_tasks:
-                    continue
-                next_tasks[tid].writes.append((k, v))
+        if live and saved.pending_writes:
+            for tid, status in read_task_statuses(saved.pending_writes).items():
+                if tid in next_tasks:
+                    next_tasks[tid].writes.extend(status.output)
             if tasks := [t for t in next_tasks.values() if t.writes]:
                 apply_writes(
                     saved.checkpoint, channels, tasks, None, self.trigger_to_nodes
@@ -1376,6 +1387,7 @@ class Pregel(
             saved.pending_writes,
             task_states,
             self.stream_channels_asis,
+            live=live,
         )
         # assemble the state snapshot
         return StateSnapshot(
@@ -1430,7 +1442,7 @@ class Pregel(
             config,
             saved,
             recurse=checkpointer if subgraphs else None,
-            apply_pending_writes=CONFIG_KEY_CHECKPOINT_ID not in config[CONF],
+            live=CONFIG_KEY_CHECKPOINT_ID not in config[CONF],
         )
 
     async def aget_state(
@@ -1474,7 +1486,7 @@ class Pregel(
             config,
             saved,
             recurse=checkpointer if subgraphs else None,
-            apply_pending_writes=CONFIG_KEY_CHECKPOINT_ID not in config[CONF],
+            live=CONFIG_KEY_CHECKPOINT_ID not in config[CONF],
         )
 
     def get_state_history(
@@ -1710,13 +1722,12 @@ class Pregel(
                             checkpointer.get_next_version,
                             self.trigger_to_nodes,
                         )
-                    # apply writes from tasks that already ran
-                    for tid, k, v in saved.pending_writes or []:
-                        if k in (ERROR, INTERRUPT):
-                            continue
-                        if tid not in next_tasks:
-                            continue
-                        next_tasks[tid].writes.append((k, v))
+                    # apply writes from tasks that already finished
+                    for tid, status in read_task_statuses(
+                        saved.pending_writes or []
+                    ).items():
+                        if tid in next_tasks:
+                            next_tasks[tid].writes.extend(status.output)
                     # clear all current tasks
                     apply_writes(
                         checkpoint,
@@ -2174,13 +2185,12 @@ class Pregel(
                             checkpointer.get_next_version,
                             self.trigger_to_nodes,
                         )
-                    # apply writes from tasks that already ran
-                    for tid, k, v in saved.pending_writes or []:
-                        if k in (ERROR, INTERRUPT):
-                            continue
-                        if tid not in next_tasks:
-                            continue
-                        next_tasks[tid].writes.append((k, v))
+                    # apply writes from tasks that already finished
+                    for tid, status in read_task_statuses(
+                        saved.pending_writes or []
+                    ).items():
+                        if tid in next_tasks:
+                            next_tasks[tid].writes.extend(status.output)
                     # clear all current tasks
                     apply_writes(
                         checkpoint,

libs/langgraph/langgraph/types.py

@@ -726,7 +726,13 @@ class StateSnapshot(NamedTuple):
     tasks: tuple[PregelTask, ...]
     """Tasks to execute in this step. If already attempted, may contain an error."""
     interrupts: tuple[Interrupt, ...]
-    """Interrupts that occurred in this step that are pending resolution."""
+    """Interrupts that occurred in this step.
+
+    When reading the latest state (`get_state` without a `checkpoint_id`), this
+    contains only interrupts still waiting for an answer. When reading a specific
+    checkpoint or state history, it contains the most recent interrupt each task
+    raised in that step, including ones answered later in the same step.
+    """
 
 
 class Send:

libs/langgraph/tests/test_interrupt_state.py

@@ -0,0 +1,534 @@
+"""State reads while some tasks of a superstep are finished and others are paused.
+
+When parallel tasks each call `interrupt()` and only some of them are resumed,
+the superstep stays open. Its recorded writes then contain the old interrupt of
+each finished task next to that task's output. These tests check that state
+reads, which are rebuilt from the checkpointer, report only the interrupts that
+still need an answer.
+"""
+
+import operator
+import sys
+import uuid
+from collections import Counter
+from typing import Annotated, Any
+
+import pytest
+from langgraph.checkpoint.base import BaseCheckpointSaver
+from typing_extensions import TypedDict
+
+from langgraph._internal._constants import (
+    ERROR,
+    INTERRUPT,
+    NO_WRITES,
+    NULL_TASK_ID,
+    RESUME,
+    RETURN,
+)
+from langgraph.func import entrypoint, task
+from langgraph.graph import END, START, StateGraph
+from langgraph.pregel._task_status import read_task_statuses
+from langgraph.types import Command, Durability, Interrupt, Send, interrupt
+
+pytestmark = pytest.mark.anyio
+
+NEEDS_CONTEXTVARS = pytest.mark.skipif(
+    sys.version_info < (3, 11),
+    reason="Python 3.11+ is required for async contextvars support",
+)
+
+
+class State(TypedDict, total=False):
+    log: Annotated[list[str], operator.add]
+    count: int
+
+
+def _config() -> dict[str, Any]:
+    return {"configurable": {"thread_id": str(uuid.uuid4())}}
+
+
+def _build_parallel(
+    checkpointer: BaseCheckpointSaver,
+    calls: Counter[str],
+    *,
+    a_questions: int = 1,
+    a_returns: Any = "log",
+):
+    """Build a graph where nodes `a` and `b` start in parallel and both ask questions.
+
+    `a` asks `a_questions` questions in a row. `a_returns` controls what `a`
+    returns after its last answer. The default `"log"` returns the answers in
+    `log`. Any other value is returned as-is.
+    """
+
+    def a(state: State) -> Any:
+        calls["a"] += 1
+        answers = [interrupt(f"A{i + 1}") for i in range(a_questions)]
+        if a_returns == "log":
+            return {"log": [f"a:{answer}" for answer in answers]}
+        return a_returns
+
+    def b(state: State) -> State:
+        calls["b"] += 1
+        return {"log": [f"b:{interrupt('B')}"]}
+
+    builder = StateGraph(State)
+    builder.add_node("a", a)
+    builder.add_node("b", b)
+    builder.add_edge(START, "a")
+    builder.add_edge(START, "b")
+    builder.add_edge("a", END)
+    builder.add_edge("b", END)
+    return builder.compile(checkpointer=checkpointer)
+
+
+def _interrupt_by_value(snapshot: Any, value: str) -> Interrupt:
+    return next(i for i in snapshot.interrupts if i.value == value)
+
+
+def _task(snapshot: Any, name: str) -> Any:
+    return next(t for t in snapshot.tasks if t.name == name)
+
+
+def _interrupt_values(interrupts: Any) -> list[str]:
+    return sorted(i.value for i in interrupts)
+
+
+# --- Task A answered and finished, task B still paused ---
+
+
+def test_finished_task_does_not_report_answered_interrupt(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    calls: Counter[str] = Counter()
+    graph = _build_parallel(sync_checkpointer, calls)
+    config = _config()
+
+    graph.invoke({"log": []}, config, durability=durability)
+    snapshot = graph.get_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["A1", "B"]
+
+    graph.invoke(
+        Command(resume={_interrupt_by_value(snapshot, "A1").id: "yes"}),
+        config,
+        durability=durability,
+    )
+
+    snapshot = graph.get_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["B"]
+    assert snapshot.next == ("b",)
+    assert _task(snapshot, "a").interrupts == ()
+    assert _task(snapshot, "a").result == {"log": ["a:yes"]}
+    assert _interrupt_values(_task(snapshot, "b").interrupts) == ["B"]
+    assert _task(snapshot, "b").result is None
+
+    # Reading the same checkpoint by id gives the record of the step: every task
+    # in it, and every question asked, including the one A already answered.
+    record = graph.get_state(snapshot.config)
+    assert sorted(record.next) == ["a", "b"]
+    assert _interrupt_values(record.interrupts) == ["A1", "B"]
+    assert _interrupt_values(_task(record, "a").interrupts) == ["A1"]
+    assert _task(record, "a").result == {"log": ["a:yes"]}
+
+    # B can still be answered, and the graph finishes normally.
+    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}
+    snapshot = graph.get_state(config)
+    assert snapshot.next == ()
+    assert snapshot.interrupts == ()
+
+    # History still shows where each question was asked.
+    asked = [
+        _interrupt_values(s.interrupts)
+        for s in graph.get_state_history(config)
+        if s.interrupts
+    ]
+    if durability != "exit":
+        assert asked == [["A1", "B"]]
+
+
+@NEEDS_CONTEXTVARS
+async def test_finished_task_does_not_report_answered_interrupt_async(
+    async_checkpointer: BaseCheckpointSaver,
+) -> None:
+    calls: Counter[str] = Counter()
+    graph = _build_parallel(async_checkpointer, calls)
+    config = _config()
+
+    await graph.ainvoke({"log": []}, config)
+    snapshot = await graph.aget_state(config)
+    await graph.ainvoke(
+        Command(resume={_interrupt_by_value(snapshot, "A1").id: "yes"}), config
+    )
+
+    snapshot = await graph.aget_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["B"]
+    assert snapshot.next == ("b",)
+    assert _task(snapshot, "a").interrupts == ()
+    assert _task(snapshot, "a").result == {"log": ["a:yes"]}
+    assert _interrupt_values(_task(snapshot, "b").interrupts) == ["B"]
+
+    record = await graph.aget_state(snapshot.config)
+    assert _interrupt_values(record.interrupts) == ["A1", "B"]
+    assert _interrupt_values(_task(record, "a").interrupts) == ["A1"]
+
+    result = await graph.ainvoke(
+        Command(resume={_interrupt_by_value(snapshot, "B").id: "ok"}), config
+    )
+    assert sorted(result["log"]) == ["a:yes", "b:ok"]
+    assert calls == {"a": 2, "b": 3}
+
+
+# --- Task A answered its first question and asked a second one ---
+
+
+def test_task_paused_at_second_question_stays_pending(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    calls: Counter[str] = Counter()
+    graph = _build_parallel(sync_checkpointer, calls, a_questions=2)
+    config = _config()
+
+    graph.invoke({"log": []}, config)
+    snapshot = graph.get_state(config)
+    graph.invoke(
+        Command(resume={_interrupt_by_value(snapshot, "A1").id: "one"}), config
+    )
+
+    snapshot = graph.get_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["A2", "B"]
+    # A is not finished: it has a saved answer, but no output.
+    assert sorted(snapshot.next) == ["a", "b"]
+    assert _interrupt_values(_task(snapshot, "a").interrupts) == ["A2"]
+    assert _task(snapshot, "a").result is None
+    assert _interrupt_values(_task(snapshot, "b").interrupts) == ["B"]
+
+    # Both remaining questions can be answered together.
+    result = graph.invoke(
+        Command(
+            resume={
+                _interrupt_by_value(snapshot, "A2").id: "two",
+                _interrupt_by_value(snapshot, "B").id: "ok",
+            }
+        ),
+        config,
+    )
+    assert sorted(result["log"]) == ["a:one", "a:two", "b:ok"]
+    snapshot = graph.get_state(config)
+    assert snapshot.next == ()
+    assert snapshot.interrupts == ()
+
+
+@NEEDS_CONTEXTVARS
+async def test_task_paused_at_second_question_stays_pending_async(
+    async_checkpointer: BaseCheckpointSaver,
+) -> None:
+    calls: Counter[str] = Counter()
+    graph = _build_parallel(async_checkpointer, calls, a_questions=2)
+    config = _config()
+
+    await graph.ainvoke({"log": []}, config)
+    snapshot = await graph.aget_state(config)
+    await graph.ainvoke(
+        Command(resume={_interrupt_by_value(snapshot, "A1").id: "one"}), config
+    )
+
+    snapshot = await graph.aget_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["A2", "B"]
+    assert sorted(snapshot.next) == ["a", "b"]
+    assert _interrupt_values(_task(snapshot, "a").interrupts) == ["A2"]
+    assert _task(snapshot, "a").result is None
+
+
+def test_task_paused_at_second_question_then_other_task_finishes(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    calls: Counter[str] = Counter()
+    graph = _build_parallel(sync_checkpointer, calls, a_questions=2)
+    config = _config()
+
+    graph.invoke({"log": []}, config)
+    snapshot = graph.get_state(config)
+    graph.invoke(
+        Command(resume={_interrupt_by_value(snapshot, "A1").id: "one"}), config
+    )
+    snapshot = graph.get_state(config)
+    graph.invoke(Command(resume={_interrupt_by_value(snapshot, "B").id: "ok"}), config)
+
+    snapshot = graph.get_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["A2"]
+    assert snapshot.next == ("a",)
+    assert _task(snapshot, "b").interrupts == ()
+    assert _task(snapshot, "b").result == {"log": ["b:ok"]}
+
+    result = graph.invoke(
+        Command(resume={_interrupt_by_value(snapshot, "A2").id: "two"}), config
+    )
+    assert sorted(result["log"]) == ["a:one", "a:two", "b:ok"]
+
+
+def test_resume_without_id_rejected_when_second_question_and_other_task_pending(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    calls: Counter[str] = Counter()
+    graph = _build_parallel(sync_checkpointer, calls, a_questions=2)
+    config = _config()
+
+    graph.invoke({"log": []}, config)
+    snapshot = graph.get_state(config)
+    graph.invoke(
+        Command(resume={_interrupt_by_value(snapshot, "A1").id: "one"}), config
+    )
+
+    # A2 and B are both waiting, so a resume value without an id is ambiguous.
+    with pytest.raises(RuntimeError, match="multiple pending interrupts"):
+        graph.invoke(Command(resume="ambiguous"), config)
+
+
+def test_resume_without_id_rejected_when_subgraph_has_parallel_interrupts(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    # A subgraph node whose child graph pauses in two parallel nodes records
+    # both interrupts under one parent task. Both count as pending, so a resume
+    # value without an id is ambiguous. (Before, only the first was counted and
+    # the value went to whichever interrupt consumed it first.)
+    child_builder = StateGraph(State)
+    child_builder.add_node("a", lambda s: {"log": [f"a:{interrupt('A')}"]})
+    child_builder.add_node("b", lambda s: {"log": [f"b:{interrupt('B')}"]})
+    child_builder.add_edge(START, "a")
+    child_builder.add_edge(START, "b")
+
+    builder = StateGraph(State)
+    builder.add_node("child", child_builder.compile())
+    builder.add_edge(START, "child")
+    graph = builder.compile(checkpointer=sync_checkpointer)
+    config = _config()
+
+    graph.invoke({"log": []}, config)
+    snapshot = graph.get_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["A", "B"]
+
+    with pytest.raises(RuntimeError, match="multiple pending interrupts"):
+        graph.invoke(Command(resume="ambiguous"), config)
+
+    result = graph.invoke(
+        Command(
+            resume={
+                _interrupt_by_value(snapshot, "A").id: "x",
+                _interrupt_by_value(snapshot, "B").id: "y",
+            }
+        ),
+        config,
+    )
+    assert sorted(result["log"]) == ["a:x", "b:y"]
+
+
+# --- Task A finished with an empty or falsy result ---
+
+
+@pytest.mark.parametrize(
+    "a_returns",
+    [None, {}, {"count": 0}, {"log": []}],
+    ids=["none", "empty_dict", "zero", "empty_list"],
+)
+def test_task_finished_with_falsy_result(
+    sync_checkpointer: BaseCheckpointSaver, a_returns: Any
+) -> None:
+    calls: Counter[str] = Counter()
+    graph = _build_parallel(sync_checkpointer, calls, a_returns=a_returns)
+    config = _config()
+
+    graph.invoke({"log": []}, config)
+    snapshot = graph.get_state(config)
+    graph.invoke(
+        Command(resume={_interrupt_by_value(snapshot, "A1").id: "yes"}), config
+    )
+
+    snapshot = graph.get_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["B"]
+    assert snapshot.next == ("b",)
+    assert _task(snapshot, "a").interrupts == ()
+
+    graph.invoke(Command(resume={_interrupt_by_value(snapshot, "B").id: "ok"}), config)
+    # A already finished, so resuming B must not run A again.
+    assert calls == {"a": 2, "b": 3}
+    snapshot = graph.get_state(config)
+    assert snapshot.next == ()
+    assert snapshot.interrupts == ()
+
+
+@pytest.mark.parametrize("a_returns", [None, {"count": 0}], ids=["none", "zero"])
+@NEEDS_CONTEXTVARS
+async def test_task_finished_with_falsy_result_async(
+    async_checkpointer: BaseCheckpointSaver, a_returns: Any
+) -> None:
+    calls: Counter[str] = Counter()
+    graph = _build_parallel(async_checkpointer, calls, a_returns=a_returns)
+    config = _config()
+
+    await graph.ainvoke({"log": []}, config)
+    snapshot = await graph.aget_state(config)
+    await graph.ainvoke(
+        Command(resume={_interrupt_by_value(snapshot, "A1").id: "yes"}), config
+    )
+
+    snapshot = await graph.aget_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["B"]
+    assert snapshot.next == ("b",)
+    assert _task(snapshot, "a").interrupts == ()
+
+    await graph.ainvoke(
+        Command(resume={_interrupt_by_value(snapshot, "B").id: "ok"}), config
+    )
+    assert calls == {"a": 2, "b": 3}
+
+
+# --- Subgraphs and the functional API ---
+
+
+def test_parallel_subgraphs_report_only_pending_interrupts(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    class ChildState(TypedDict):
+        prompt: str
+        answers: Annotated[list[str], operator.add]
+
+    def ask(state: ChildState) -> dict[str, Any]:
+        return {"answers": [interrupt(state["prompt"])]}
+
+    child_builder = StateGraph(ChildState)
+    child_builder.add_node("ask", ask)
+    child_builder.add_edge(START, "ask")
+    child = child_builder.compile()
+
+    class ParentState(TypedDict):
+        answers: Annotated[list[str], operator.add]
+
+    builder = StateGraph(ParentState)
+    builder.add_node("child", child)
+    builder.add_conditional_edges(
+        START,
+        lambda _: [Send("child", {"prompt": p, "answers": []}) for p in ("a", "b")],
+        ["child"],
+    )
+    graph = builder.compile(checkpointer=sync_checkpointer)
+    config = _config()
+
+    graph.invoke({"answers": []}, config)
+    snapshot = graph.get_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["a", "b"]
+    graph.invoke(Command(resume={_interrupt_by_value(snapshot, "a").id: "x"}), config)
+
+    snapshot = graph.get_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["b"]
+    assert snapshot.next == ("child",)
+    finished = next(t for t in snapshot.tasks if t.result is not None)
+    assert finished.interrupts == ()
+    assert finished.result == {"answers": ["x"]}
+
+    result = graph.invoke(
+        Command(resume={_interrupt_by_value(snapshot, "b").id: "y"}), config
+    )
+    assert sorted(result["answers"]) == ["x", "y"]
+
+
+def test_functional_task_finished_with_none_is_not_rerun(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    calls: Counter[str] = Counter()
+
+    @task
+    def ask_a() -> None:
+        calls["a"] += 1
+        interrupt("A")
+
+    @task
+    def ask_b() -> str:
+        calls["b"] += 1
+        return interrupt("B")
+
+    @entrypoint(checkpointer=sync_checkpointer)
+    def workflow(_: Any) -> list[Any]:
+        a, b = ask_a(), ask_b()
+        return [a.result(), b.result()]
+
+    config = _config()
+    workflow.invoke(1, config)
+    snapshot = workflow.get_state(config)
+    workflow.invoke(
+        Command(resume={_interrupt_by_value(snapshot, "A").id: "x"}), config
+    )
+
+    snapshot = workflow.get_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["B"]
+
+    result = workflow.invoke(
+        Command(resume={_interrupt_by_value(snapshot, "B").id: "y"}), config
+    )
+    assert result == [None, "y"]
+    assert calls == {"a": 2, "b": 3}
+
+
+# --- Reading task status from recorded writes ---
+
+
+def test_read_task_statuses() -> None:
+    a1 = Interrupt(value="A1", id="a")
+    a2 = Interrupt(value="A2", id="a")
+    b = Interrupt(value="B", id="b")
+    error = ValueError("boom")
+
+    statuses = read_task_statuses(
+        [
+            # answered and finished: old interrupt stays recorded
+            ("finished", INTERRUPT, (a1,)),
+            ("finished", RESUME, ["yes"]),
+            ("finished", "log", ["a:yes"]),
+            # answered once, then paused at a second question
+            ("paused", INTERRUPT, (a2,)),
+            ("paused", RESUME, ["one"]),
+            # finished with no output
+            ("no_output", INTERRUPT, (b,)),
+            ("no_output", RESUME, ["ok"]),
+            ("no_output", NO_WRITES, None),
+            # functional task that returned None
+            ("returned_none", RETURN, None),
+            # failed
+            ("failed", ERROR, error),
+            # not a task
+            (NULL_TASK_ID, RESUME, "global"),
+        ]
+    )
+
+    assert set(statuses) == {
+        "finished",
+        "paused",
+        "no_output",
+        "returned_none",
+        "failed",
+    }
+
+    assert statuses["finished"].finished
+    assert statuses["finished"].interrupts == (a1,)
+    assert statuses["finished"].pending_interrupts == ()
+    assert statuses["finished"].output == (("log", ["a:yes"]),)
+
+    assert not statuses["paused"].finished
+    assert statuses["paused"].interrupts == (a2,)
+    assert statuses["paused"].pending_interrupts == (a2,)
+    assert statuses["paused"].output == ()
+
+    assert statuses["no_output"].finished
+    assert statuses["no_output"].interrupts == (b,)
+    assert statuses["no_output"].pending_interrupts == ()
+
+    assert statuses["returned_none"].finished
+    assert statuses["returned_none"].output == ((RETURN, None),)
+
+    assert not statuses["failed"].finished
+    assert statuses["failed"].error is error