prebuilt: release 0.1.0 (#3610)

Update `low_level.md`: Add a tutorial link for map-reduce, now it's
perfect !!!

.github/workflows/ci.yml

@@ -20,7 +20,31 @@ env:
   POETRY_VERSION: "1.7.1"
 
 jobs:
+  changes:
+    runs-on: ubuntu-latest
+    outputs:
+      python: ${{ steps.filter.outputs.python }}
+      sdk-js: ${{ steps.filter.outputs.sdk-js }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dorny/paths-filter@v3
+        id: filter
+        with:
+          filters: |
+            python:
+              - 'libs/langgraph/**'
+              - 'libs/sdk-py/**'
+              - 'libs/cli/**'
+              - 'libs/checkpoint/**'
+              - 'libs/checkpoint-sqlite/**'
+              - 'libs/checkpoint-postgres/**'
+              - 'libs/scheduler-kafka/**'
+              - 'libs/prebuilt/**'
+            sdk-js:
+              - 'libs/sdk-js/**'
+
   lint:
+    needs: changes
     name: cd ${{ matrix.working-directory }}
     strategy:
       matrix:
@@ -33,13 +57,16 @@ jobs:
             "libs/checkpoint-sqlite",
             "libs/checkpoint-postgres",
             "libs/scheduler-kafka",
+            "libs/prebuilt",
           ]
+    if: needs.changes.outputs.python == 'true'
     uses: ./.github/workflows/_lint.yml
     with:
       working-directory: ${{ matrix.working-directory }}
     secrets: inherit
 
   test:
+    needs: changes
     name: cd ${{ matrix.working-directory }}
     strategy:
       matrix:
@@ -49,7 +76,9 @@ jobs:
             "libs/checkpoint",
             "libs/checkpoint-sqlite",
             "libs/checkpoint-postgres",
+            "libs/prebuilt",
           ]
+    if: needs.changes.outputs.python == 'true'
     uses: ./.github/workflows/_test.yml
     with:
       working-directory: ${{ matrix.working-directory }}
@@ -57,17 +86,23 @@ jobs:
 
   # NOTE: we're testing langgraph separately because it requires a different matrix
   test-langgraph:
+    needs: changes
+    if: needs.changes.outputs.python == 'true'
     name: "cd libs/langgraph"
     uses: ./.github/workflows/_test_langgraph.yml
     secrets: inherit
 
   # NOTE: we're testing scheduler-kafka separately because it requires a different matrix
   test-scheduler-kafka:
+    needs: changes
+    if: needs.changes.outputs.python == 'true'
     name: "cd libs/scheduler-kafka"
     uses: ./.github/workflows/_test_scheduler_kafka.yml
     secrets: inherit
 
   check-sdk-methods:
+    needs: changes
+    if: needs.changes.outputs.python == 'true'
     name: "Check SDK methods matching"
     runs-on: ubuntu-latest
     steps:
@@ -80,11 +115,15 @@ jobs:
         run: python .github/scripts/check_sdk_methods.py
 
   integration-test:
+    needs: changes
+    if: needs.changes.outputs.python == 'true'
     name: CLI integration test
     uses: ./.github/workflows/_integration_test.yml
     secrets: inherit
 
   lint-js:
+    needs: changes
+    if: needs.changes.outputs.sdk-js == 'true'
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -109,6 +148,8 @@ jobs:
         run: yarn build
 
   test-js:
+    needs: changes
+    if: needs.changes.outputs.sdk-js == 'true'
     runs-on: ubuntu-latest
     strategy:
       matrix:

.github/workflows/deploy_docs.yml

@@ -117,6 +117,7 @@ jobs:
               --check-links-ignore "https://(api|web|docs)\.smith\.langchain\.com/.*" \
               --check-links-ignore "https://academy\.langchain\.com/.*" \
               --check-links-ignore "https://x.com/.*" \
+              --check-links-ignore "https://twitter.com/.*" \
               --check-links-ignore "https://github\.com/.*" \
               --check-links-ignore "http://localhost:8123/.*" \
               --check-links-ignore "http://localhost:2024.*" \
@@ -143,6 +144,7 @@ jobs:
                 --check-links-ignore "http://localhost:2024.*" \
                 --check-links-ignore "http://127.0.0.1:.*" \
                 --check-links-ignore "https://x.com/.*" \
+                --check-links-ignore "https://twitter.com/.*" \
                 --check-links-ignore "https://github\.com/.*" \
                 --check-links-ignore "/.*\.(ipynb|html)$" \
                 --check-links ${CHANGED_FILES} \

.github/workflows/release.yml

@@ -195,7 +195,7 @@ jobs:
               "$PKG_NAME==$VERSION" \
           )
 
-          if [[ "$PKG_NAME" == *checkpoint* ]]; then
+          if [[ "$PKG_NAME" == *checkpoint* || "$PKG_NAME" == *prebuilt* ]]; then
             # since checkpoint packages are namespace packages, import them with . convention
             # i.e. import langgraph.checkpoint or langgraph.checkpoint.sqlite
             IMPORT_NAME="$(echo "$PKG_NAME" | sed s/-/./g)"

.github/workflows/run_notebooks.yml

@@ -22,7 +22,7 @@ jobs:
       matrix:
         lib-version:
           - "development"
-          - "latest"
+          # - "latest"
 
     steps:
       - uses: actions/checkout@v4

README.md

@@ -70,7 +70,7 @@ pip install -U langgraph
 Let's build a tool-calling [ReAct-style](https://langchain-ai.github.io/langgraph/concepts/agentic_concepts/#react-implementation) agent that uses a search tool!
 
 ```shell
-pip install langchain-anthropic
+pip install langgraph-prebuilt langchain-anthropic
 ```
 
 ```shell

docs/_scripts/generate_api_reference_links.py

@@ -1,12 +1,9 @@
+import ast
 import importlib
-from importlib.machinery import ModuleSpec
-import importlib.util
-import inspect
 import logging
 import re
 from functools import lru_cache
-import sys
-from typing import List, Literal, Optional
+from typing import List, Optional
 
 from typing_extensions import TypedDict
 
@@ -42,7 +39,6 @@ MANUAL_API_REFERENCES_LANGGRAPH = [
     (["langgraph.graph"], "langgraph.graph.message", "add_messages", "graphs"),
     (["langgraph.graph"], "langgraph.graph.state", "StateGraph", "graphs"),
     (["langgraph.graph"], "langgraph.graph.state", "CompiledStateGraph", "graphs"),
-    ([], "langgraph.types", "StreamMode", "types"),
     (["langgraph.graph"], "langgraph.constants", "START", "constants"),
     (["langgraph.graph"], "langgraph.constants", "END", "constants"),
     (["langgraph.constants"], "langgraph.types", "Send", "types"),
@@ -51,7 +47,9 @@ MANUAL_API_REFERENCES_LANGGRAPH = [
     (["langgraph.constants"], "langgraph.types", "Command", "types"),
     (["langgraph.func"], "langgraph.func", "entrypoint", "func"),
     (["langgraph.func"], "langgraph.func", "task", "func"),
-    ([], "langgraph.types", "RetryPolicy", "types"),
+    (["langgraph.types"], "langgraph.types", "RetryPolicy", "types"),
+    (["langgraph.types"], "langgraph.types", "StreamMode", "types"),
+    (["langgraph.types"], "langgraph.types", "StreamWriter", "types"),
     ([], "langgraph.checkpoint.base", "Checkpoint", "checkpoints"),
     ([], "langgraph.checkpoint.base", "CheckpointMetadata", "checkpoints"),
     ([], "langgraph.checkpoint.base", "BaseCheckpointSaver", "checkpoints"),
@@ -71,224 +69,149 @@ WELL_KNOWN_LANGGRAPH_OBJECTS = {
 }
 
 
-def _make_regular_expression(pkg_prefix: str) -> re.Pattern:
-    if not pkg_prefix.isidentifier():
-        raise ValueError(f"Invalid package prefix: {pkg_prefix}")
-    return re.compile(
-        r"from\s+(" + pkg_prefix + r"(?:_\w+)?(?:\.\w+)*?)\s+import\s+\(?"
-        r"((?:\w+(?:,\s*)?)*)\s*\)?",  # Match zero or more words separated by a comma+optional ws
-        re.DOTALL,  # Match newlines as well
-    )
-
-
-# Regular expression to match langchain import lines
-_IMPORT_LANGCHAIN_RE = _make_regular_expression("langchain")
-_IMPORT_LANGGRAPH_RE = _make_regular_expression("langgraph")
-
-
 @lru_cache(maxsize=10_000)
-def _get_full_module_name(
-    module_path: str, class_name: str | None, doc_title: str
-) -> Optional[str]:
+def _get_full_module_name(module_path: str, class_name: str) -> Optional[str]:
     """Get full module name using inspect, with LRU cache to memoize results."""
     try:
-        if module_path in sys.modules:
-            module = sys.modules[module_path]
-        else:
-            spec: ModuleSpec | None = importlib.util.find_spec(module_path)
-            if spec is not None:
-                module = importlib.util.module_from_spec(spec)
-                sys.modules[module_path] = module
-                spec.loader.exec_module(module)
-
-        if class_name is not None:
-            class_ = getattr(module, class_name)
-
-            if re.match(r"\w+\s+as\s+\w+", class_name):
-                # Handle cases like "A as B"
-                class_name, _ = class_name.split(" as ")
-
-            module = inspect.getmodule(class_)
-            if module is None:
-                # For constants, inspect.getmodule() might return None
-                # In this case, we'll return the original module_path
-                return module_path
-        return module.__name__
+        module = importlib.import_module(module_path)
+        symbol = getattr(module, class_name)
+        # First check the __module__ attribute on the symbol.
+        mod_name = getattr(symbol, "__module__", None)
+        # If __module__ is not set or comes from typing,
+        # assume the definition is in module_path.
+        if mod_name is None or mod_name.startswith("typing"):
+            return module_path
+        return mod_name
     except AttributeError as e:
-        if class_name is not None:
-            # the class_name might actually be a module
-            # e.g. from langchain import hub
-            # try to import it as a module, and if that doesn't work, throw
-            if class_name is not None:
-                module_name = _get_full_module_name(
-                    f"{module_path}.{class_name}", None, doc_title
-                )
-                if module_name is not None:
-                    # return the name of the parent module, rather than the name of the class as though it were a module
-                    return module.__name__
-                logger.warning(
-                    f"API Reference: Could not find module for {class_name} in {module_path}, imported in doc {doc_title}, {e}"
-                )
-            # don't log if we're trying to import the "hub" part as though it were a module
-        logger.warning(
-            f"API Reference: Could not find module for {module_path}, imported in doc {doc_title}, {e}"
-        )
+        logger.warning(f"API Reference: Could not find module for {class_name}, {e}")
         return None
     except ImportError as e:
-        logger.warning(
-            f"API Reference: Failed to import module {module_path} {doc_title}, {e}"
-        )
+        logger.warning(f"API Reference: Failed to load for class {class_name}, {e}")
         return None
 
 
-def _get_doc_title(data: str, file_name: str) -> str:
-    try:
-        return re.findall(r"^#\s*(.*)", data, re.MULTILINE)[0]
-    except IndexError:
-        pass
-    # Parse the rst-style titles
-    try:
-        return re.findall(r"^(.*)\n=+\n", data, re.MULTILINE)[0]
-    except IndexError:
-        return file_name
-
-
 class ImportInformation(TypedDict):
     imported: str  # The name of the class that was imported.
     source: str  # The full module path from which the class was imported.
     docs: str  # The URL pointing to the class's documentation.
-    title: str  # The title of the document where the import is used.
+    path: str  # The path of the file where the markdown content originated.
 
 
-def _get_imports(
-    code: str, doc_title: str, package_ecosystem: Literal["langchain", "langgraph"]
-) -> List[ImportInformation]:
-    """Get imports from the given code block.
-
-    Args:
-        code: Python code block from which to extract imports
-        doc_title: Title of the document
-        package_ecosystem: "langchain" or "langgraph". The two live in different
-            repositories and have separate documentation sites.
-
-    Returns:
-        List of import information for the given code block
-    """
-    imports = []
-
-    if package_ecosystem == "langchain":
-        pattern = _IMPORT_LANGCHAIN_RE
-    elif package_ecosystem == "langgraph":
-        pattern = _IMPORT_LANGGRAPH_RE
-    else:
-        raise ValueError(f"Invalid package ecosystem: {package_ecosystem}")
-
-    for import_match in pattern.finditer(code):
-        module = import_match.group(1)
-        if "pydantic_v1" in module:
-            continue
-        imports_str = (
-            import_match.group(2).replace("(\n", "").replace("\n)", "")
-        )  # Handle newlines within parentheses
-        # remove any newline and spaces, then split by comma
-        imported_classes = [
-            imp.strip()
-            for imp in re.split(r",\s*", imports_str.replace("\n", ""))
-            if imp.strip()
-        ]
-        for class_name in imported_classes:
-            if module == "langchain_core.messages" and class_name == ")":
-                print("WARNING: ", file=sys.stderr)
-                print(
-                    f"WARNING: Trying to import {class_name} from {module} in doc {doc_title}",
-                    file=sys.stderr,
-                )
-                print("WARNING: ", file=sys.stderr)
-                print("WARNING:", import_match.group(0), file=sys.stderr)
-                print("WARNING: ", file=sys.stderr)
-                print(
-                    "\n".join([f"WARNING: {line}" for line in code.splitlines()]),
-                    file=sys.stderr,
-                )
-                print("WARNING: ", file=sys.stderr)
-
-            module_path = _get_full_module_name(module, class_name, doc_title)
-            if not module_path:
-                continue
-            if len(module_path.split(".")) < 2:
-                continue
-
-            if package_ecosystem == "langchain":
-                pkg = module_path.split(".")[0].replace("langchain_", "")
-                top_level_mod = module_path.split(".")[1]
-
-                url = (
-                    _LANGCHAIN_API_REFERENCE
-                    + pkg
-                    + "/"
-                    + top_level_mod
-                    + "/"
-                    + module_path
-                    + "."
-                    + class_name
-                    + ".html"
-                )
-            elif package_ecosystem == "langgraph":
-                if (module, class_name) not in WELL_KNOWN_LANGGRAPH_OBJECTS:
-                    # Likely not documented yet
-                    continue
-
-                source_module, namespace = WELL_KNOWN_LANGGRAPH_OBJECTS[
-                    (module, class_name)
-                ]
-                url = (
-                    _LANGGRAPH_API_REFERENCE
-                    + namespace
-                    + "/#"
-                    + source_module
-                    + "."
-                    + class_name
-                )
-            else:
-                raise ValueError(f"Invalid package ecosystem: {package_ecosystem}")
-
-            # Add the import information to our list
-            imports.append(
-                {
-                    "imported": class_name,
-                    "source": module,
-                    "docs": url,
-                    "title": doc_title,
-                }
-            )
-
-    return imports
-
-
-def get_imports(code: str, doc_title: str) -> List[ImportInformation]:
+def get_imports(code: str, path: str) -> List[ImportInformation]:
     """Retrieve all import references from the given code for specified ecosystems.
 
     Args:
         code: The source code from which to extract import references.
-        doc_title: The documentation title associated with the code.
+        path: The path of the file where the markdown content originated.
 
     Returns:
         A list of import information for each import found.
     """
-    ecosystems = ["langchain", "langgraph"]
-    all_imports = []
-    for package_ecosystem in ecosystems:
-        all_imports.extend(_get_imports(code, doc_title, package_ecosystem))
-    return all_imports
+    # Parse the code into an AST.
+    try:
+        tree = ast.parse(code)
+    except SyntaxError:
+        return []
+
+    found_imports = []
+
+    # Walk through the AST and process ImportFrom nodes.
+    for node in ast.walk(tree):
+        if isinstance(node, ast.ImportFrom):
+            # node.module is the source module.
+            if node.module is None:
+                continue
+            for alias in node.names:
+                if not (
+                    node.module.startswith("langchain")
+                    or node.module.startswith("langgraph")
+                ):
+                    continue
+
+                found_imports.append(
+                    {
+                        "source": node.module,
+                        # alias.name is the original name even if an alias exists.
+                        "imported": alias.name,
+                    }
+                )
+
+    imports: list[ImportInformation] = []
+
+    for found_import in found_imports:
+        module = found_import["source"]
+
+        if module.startswith("langchain"):
+            # Handles things like `langchain` or `langchain_anthropic`
+            package_ecosystem = "langchain"
+        elif module.startswith("langgraph"):
+            package_ecosystem = "langgraph"
+        else:
+            continue
+
+        class_name = found_import["imported"]
+        module_path = _get_full_module_name(module, class_name)
+        if not module_path:
+            continue
+        if len(module_path.split(".")) < 2:
+            continue
+
+        if package_ecosystem == "langchain":
+            pkg = module_path.split(".")[0].replace("langchain_", "")
+            top_level_mod = module_path.split(".")[1]
+
+            url = (
+                _LANGCHAIN_API_REFERENCE
+                + pkg
+                + "/"
+                + top_level_mod
+                + "/"
+                + module_path
+                + "."
+                + class_name
+                + ".html"
+            )
+        elif package_ecosystem == "langgraph":
+            if (module, class_name) not in WELL_KNOWN_LANGGRAPH_OBJECTS:
+                # Likely not documented yet
+                continue
+
+            source_module, namespace = WELL_KNOWN_LANGGRAPH_OBJECTS[
+                (module, class_name)
+            ]
+            url = (
+                _LANGGRAPH_API_REFERENCE
+                + namespace
+                + "/#"
+                + source_module
+                + "."
+                + class_name
+            )
+        else:
+            raise ValueError(f"Invalid package ecosystem: {package_ecosystem}")
+
+        # Add the import information to our list
+        imports.append(
+            {
+                "imported": class_name,
+                "source": module,
+                "docs": url,
+                "path": path,
+            }
+        )
+
+    return imports
 
 
-def update_markdown_with_imports(markdown: str, file_name: str) -> str:
+def update_markdown_with_imports(markdown: str, path: str) -> str:
     """Update markdown to include API reference links for imports in Python code blocks.
 
-    This function scans the markdown content for Python code blocks, extracts any imports, and appends links to their API documentation.
+    This function scans the markdown content for Python code blocks, extracts any
+    imports, and appends links to their API documentation.
 
     Args:
         markdown: The markdown content to process.
+        path: The path of the file where the markdown content originated.
 
     Returns:
         Updated markdown with API reference links appended to Python code blocks.
@@ -299,7 +222,8 @@ def update_markdown_with_imports(markdown: str, file_name: str) -> str:
         ```python
         from langchain.nlp import TextGenerator
         ```
-        This function will append an API reference link to the `TextGenerator` class from the `langchain.nlp` module if it's recognized.
+        This function will append an API reference link to the `TextGenerator` class
+        from the `langchain.nlp` module if it's recognized.
     """
     code_block_pattern = re.compile(
         r"(?P<indent>[ \t]*)```(?P<language>python|py)\n(?P<code>.*?)\n(?P=indent)```",
@@ -317,9 +241,8 @@ def update_markdown_with_imports(markdown: str, file_name: str) -> str:
         """
         indent = match.group("indent")
         code_block = match.group("code")
-        language = match.group("language")  # Preserve the language from the regex match
         # Retrieve import information from the code block
-        imports = get_imports(code_block, file_name)
+        imports = get_imports(code_block, "__unused__")
 
         original_code_block = match.group(0)
         # If no imports are found, return the original code block

docs/_scripts/notebook_hooks.py

@@ -175,7 +175,7 @@ def _on_page_markdown_with_config(
 
     # Append API reference links to code blocks
     if add_api_references:
-        markdown = update_markdown_with_imports(markdown, page.file.src_path)
+        markdown = update_markdown_with_imports(markdown, page.file.abs_src_path)
     # Apply highlight comments to code blocks
     markdown = _highlight_code_blocks(markdown)
 

docs/_scripts/third_party_page/create_third_party_page.py

@@ -83,14 +83,18 @@ def generate_markdown(resolved_packages: List[ResolvedPackage], language: str) -
         resolved_packages, key=lambda p: p["weekly_downloads"] or 0, reverse=True
     )
     rows = [
-        "| Name | GitHub URL | Description | Weekly Downloads |",
-        "| --- | --- | --- | --- |",
+        "| Name | GitHub URL | Description | Weekly Downloads | Stars |",
+        "| --- | --- | --- | --- | --- |",
     ]
     for package in sorted_packages:
         name = f"**{package['name']}**"
         repo_url = f"[{package['repo']}](https://github.com/{package['repo']})"
-        downloads = package["weekly_downloads"] or 0
-        row = f"| {name} | {repo_url} | {package['description']} | {downloads} |"
+        stars_badge = (
+            f"https://img.shields.io/github/stars/{package['repo']}?style=social"
+        )
+        stars = f"![GitHub stars]({stars_badge})"
+        downloads = package["weekly_downloads"] or "-"
+        row = f"| {name} | {repo_url} | {package['description']} | {downloads} | {stars}"
         rows.append(row)
     markdown_content = MARKDOWN.format(
         library_list="\n".join(rows), langgraph_url=langgraph_url

docs/_scripts/third_party_page/get_download_stats.py

@@ -35,20 +35,45 @@ def _get_weekly_downloads(packages: list[Package]) -> list[ResolvedPackage]:
     resolved_packages: list[ResolvedPackage] = []
 
     for package in packages:
-        url = f"https://pypistats.org/api/packages/{package['name']}/overall"
+        # First check if package exists on PyPI
+        pypi_url = f"https://pypi.org/pypi/{package['name']}/json"
+        try:
+            pypi_response = requests.get(pypi_url)
+            pypi_response.raise_for_status()
+        except requests.exceptions.HTTPError:
+            raise AssertionError(f"Package {package['name']} does not exist on PyPI")
 
-        response = requests.get(url)
-        response.raise_for_status()
-        data = response.json()
+        # Get first release date
+        pypi_data = pypi_response.json()
+        releases = pypi_data["releases"]
+        first_release_date = None
+        for version_releases in releases.values():
+            if version_releases:  # Some versions may be empty lists
+                upload_time = datetime.fromisoformat(version_releases[0]["upload_time"])
+                if first_release_date is None or upload_time < first_release_date:
+                    first_release_date = upload_time
 
-        sorted_data = sorted(
-            data["data"],
-            key=lambda x: datetime.strptime(x["date"], "%Y-%m-%d"),
-            reverse=True,
-        )
+        if first_release_date is None:
+            raise AssertionError(f"Package {package['name']} has no releases yet")
 
-        # Sum the last 7 days of downloads
-        num_downloads = sum(entry["downloads"] for entry in sorted_data[:7])
+        # If package was published in last 48 hours, skip download stats
+        if (datetime.now() - first_release_date).total_seconds() >= 48 * 3600:
+            url = f"https://pypistats.org/api/packages/{package['name']}/overall"
+
+            response = requests.get(url)
+            response.raise_for_status()
+            data = response.json()
+
+            sorted_data = sorted(
+                data["data"],
+                key=lambda x: datetime.strptime(x["date"], "%Y-%m-%d"),
+                reverse=True,
+            )
+
+            # Sum the last 7 days of downloads
+            num_downloads = sum(entry["downloads"] for entry in sorted_data[:7])
+        else:
+            num_downloads = None
 
         resolved_packages.append(
             {

docs/_scripts/third_party_page/packages.yml

@@ -2,13 +2,25 @@
 packages:
   - name: "trustcall"
     repo: "hinthornw/trustcall"
-    description: "Tenacious tool calling built on LangGraph"
+    description: "Tenacious tool calling built on LangGraph."
   - name: "breeze-agent"
     repo: "andrestorres123/breeze-agent"
-    description: "A streamlined research system built inspired on STORM and built on LangGraph"
+    description: "A streamlined research system built inspired on STORM and built on LangGraph."
   - name: "langgraph-supervisor"
-    repo: "langchain-ai/langgraph-supervisor"
-    description: "Build supervisor multi-agent systems with LangGraph"
+    repo: "langchain-ai/langgraph-supervisor-py"
+    description: "Build supervisor multi-agent systems with LangGraph."
   - name: "langmem"
     repo: "langchain-ai/langmem"
     description: "Build agents that learn and adapt from interactions over time."
+  - name: "langchain-mcp-adapters"
+    repo: "langchain-ai/langchain-mcp-adapters"
+    description: "Make Anthropic Model Context Protocol (MCP) tools compatible with LangGraph agents."
+  - name: "open-deep-research"
+    repo: "langchain-ai/open_deep_research"
+    description: "Open source assistant for iterative web research and report writing."
+  - name: "langgraph-swarm"
+    repo: "langchain-ai/langgraph-swarm-py"
+    description: "Build swarm-style multi-agent systems using LangGraph."
+  - name: "delve-taxonomy-generator"
+    repo: "andrestorres123/delve"
+    description: "A taxonomy generator for unstructured data"

docs/docs/adopters.md

@@ -9,9 +9,11 @@ This list of companies using LangGraph and their success stories is compiled fro
 | [AppFolio](https://www.appfolio.com/) | Real Estate | Copilot for domain-specific task | [Case study, 2024](https://blog.langchain.dev/customers-appfolio/) |
 | [Athena Intelligence](https://www.athenaintel.com/) | Software & Technology (GenAI Native) | Research & summarization | [Case study, 2024](https://blog.langchain.dev/customers-athena-intelligence/) |
 | [Captide](https://www.captide.co/) | Software & Technology (GenAI Native) | Data extraction | [Case study, 2025](https://blog.langchain.dev/how-captide-is-redefining-equity-research-with-agentic-workflows-built-on-langgraph-and-langsmith/) |
+| [Cisco Outshift](https://outshift.cisco.com/) | Software & Technology | DevOps | [Blog post, 2025](https://outshift.cisco.com/blog/build-react-agent-application-for-devops-tasks-using-rest-apis) |
 | [Elastic](https://www.elastic.co/) | Software & Technology | Copilot for domain-specific task | [Blog post, 2025](https://www.elastic.co/blog/elastic-security-generative-ai-features) |
 | [GitLab](https://about.gitlab.com/) | Software & Technology | Code generation | [Duo workflow docs](https://handbook.gitlab.com/handbook/engineering/architecture/design-documents/duo_workflow/) |
 | [Infor](https://infor.com/) | Software & Technology | GenAI embedded product experiences; customer support; copilot | [Case study, 2025](https://blog.langchain.dev/customers-infor/) |
+| [Klarna](https://www.klarna.com/) | Fintech | Copilot for domain-specific task | [Case study, 2025](https://blog.langchain.dev/customers-klarna/) |
 | [Komodo Health](https://www.komodohealth.com/) | Healthcare | Copilot for domain-specific task | [Blog post](https://www.komodohealth.com/perspectives/new-gen-ai-assistant-empowers-the-enterprise/) |
 | [LinkedIn](https://www.linkedin.com/) | Social Media | Code generation; Search & discovery | [Blog post, 2025](https://www.linkedin.com/blog/engineering/ai/practical-text-to-sql-for-data-analytics); [Blog post, 2024](https://www.linkedin.com/blog/engineering/generative-ai/behind-the-platform-the-journey-to-create-the-linkedin-genai-application-tech-stack) |
 | [Minimal](https://gominimal.ai/) | E-commerce | Customer support | [Case study, 2025](https://blog.langchain.dev/how-minimal-built-a-multi-agent-customer-support-system-with-langgraph-langsmith/) |
@@ -22,4 +24,4 @@ This list of companies using LangGraph and their success stories is compiled fro
 | [Tradestack](https://www.tradestack.uk/) | Software & Technology (GenAI Native) | Copilot for domain-specific task | [Case study, 2024](https://blog.langchain.dev/customers-tradestack/) |
 | [Uber](https://www.uber.com/) | Transportation | Developer productivity; Code generation | [Presentation, 2024](https://dpe.org/sessions/ty-smith-adam-huda/this-year-in-ubers-ai-driven-developer-productivity-revolution/); [Video, 2024](https://www.youtube.com/watch?v=8rkA5vWUE4Y) |
 | [Unify](https://www.unifygtm.com/) | Software & Technology (GenAI Native) | Copilot for domain-specific task | [Blog post, 2024](https://blog.langchain.dev/unify-launches-agents-for-account-qualification-using-langgraph-and-langsmith/) |
-| [Vizient](https://www.vizientinc.com/) | Healthcare | Copilot for domain-specific task | [Case study, 2025](https://blog.langchain.dev/p/3d2cd58c-13a5-4df9-bd84-7d54ed0ed82c/) |
+| [Vizient](https://www.vizientinc.com/) | Healthcare | Copilot for domain-specific task | [Case study, 2025](https://blog.langchain.dev/p/3d2cd58c-13a5-4df9-bd84-7d54ed0ed82c/) |

docs/docs/cloud/deployment/cloud.md

@@ -92,3 +92,28 @@ Starting from the `LangGraph Platform` view...
 1. Check/uncheck checkbox to `Automatically update deployment on push to branch`.
     1. Branch creation/deletion and tag creation/deletion events will not trigger an update. Only pushes to an existing branch will trigger an update.
     1. Pushes in quick succession to a branch will not trigger subsequent updates. In the future, this functionality may be changed/improved.
+
+## Add or Remove GitHub Repositories
+
+After installing and authorizing LangChain's `hosted-langserve` GitHub app, repository access for the app can be modified to add new repositories or remove existing repositories. If a new repository is created, it may need to be added explicitly.
+
+1. From the GitHub profile, navigate to `Settings` > `Applications` > `hosted-langserve` > click `Configure`.
+1. Under `Repository access`, select `All repositories` or `Only select repositories`. If `Only select repositories` is selected, new repositories must be explicitly added.
+1. Click `Save`.
+1. When creating a new deployment, the list of GitHub repositories in the dropdown menu will be updated to reflect the repository access changes.
+
+## Whitelisting IP Addresses
+
+All traffic from `LangGraph Platform` deployments created after January 6th 2025 will come through a NAT gateway.
+This NAT gateway will have several static ip addresses depending on the region you are deploying in. Refer to the table below for the list of IP addresses to whitelist:
+
+| US             | EU             |
+|----------------|----------------|
+| 35.197.29.146  | 34.13.192.67   |
+| 34.145.102.123 | 34.147.105.64  |
+| 34.169.45.153  | 34.90.22.166   |
+| 34.82.222.17   | 34.147.36.213  |
+| 35.227.171.135 | 34.32.137.113  | 
+| 34.169.88.30   | 34.91.238.184  |
+| 34.19.93.202   | 35.204.101.241 |
+| 34.19.34.50    | 35.204.48.32   |

docs/docs/cloud/how-tos/iterate_graph_studio.md

@@ -0,0 +1,15 @@
+# Prompt Engineering in LangGraph Studio
+
+In LangGraph Studio you can iterate on the prompts used within your graph by utilizing the LangSmith Playground. To do so:
+
+1. Open an existing thread or create a new one.
+2. Within the thread log, any nodes that have made an LLM call will have a "View LLM Runs" button. Clicking this will open a popover with the LLM runs for that node.
+3. Select the LLM run you want to edit. This will open the LangSmith Playground with the selected LLM run.
+
+![Playground in Studio](../img/studio_playground.png){width=1200}
+
+
+
+From here you can edit the prompt, test different model configurations and re-run just this LLM call without having to re-run the entire graph. When you are happy with your changes, you can copy the updated prompt back into your graph.
+
+For more information on how to use the LangSmith Playground, see the [LangSmith Playground documentation](https://docs.smith.langchain.com/prompt_engineering/how_to_guides#playground).

docs/docs/cloud/how-tos/use_stream_react.md

@@ -9,13 +9,19 @@ The `useStream()` React hook provides a seamless way to integrate LangGraph into
 Key features:
 
 - Messages streaming: Handle a stream of message chunks to form a complete message
-- Automatic state management for messages, loading states, and errors
+- Automatic state management for messages, interrupts, loading states, and errors
 - Conversation branching: Create alternate conversation paths from any point in the chat history
-- UI-agnostic design - bring your own components and styling
+- UI-agnostic design: bring your own components and styling
 
 Let's explore how to use `useStream()` in your React application.
 
-The `useStream()` provides a solid foundation for creating bespoke chat experiences. For pre-built chat components and interfaces, we recommend checking out [CopilotKit](https://docs.copilotkit.ai/coagents/quickstart/langgraph) and [assistant-ui](https://www.assistant-ui.com/docs/runtimes/langgraph).
+The `useStream()` provides a solid foundation for creating bespoke chat experiences. For pre-built chat components and interfaces, we also recommend checking out [CopilotKit](https://docs.copilotkit.ai/coagents/quickstart/langgraph) and [assistant-ui](https://www.assistant-ui.com/docs/runtimes/langgraph).
+
+## Installation
+
+```bash
+npm install @langchain/langgraph-sdk @langchain/core
+```
 
 ## Example
 
@@ -58,9 +64,7 @@ export default function App() {
             Stop
           </button>
         ) : (
-          <button key="submit" type="submit">
-            Send
-          </button>
+          <button keytype="submit">Send</button>
         )}
       </form>
     </div>
@@ -74,6 +78,7 @@ The `useStream()` hook takes care of all the complex state management behind the
 
 - Thread state management
 - Loading and error states
+- Interrupts
 - Message handling and updates
 - Branching support
 
@@ -127,9 +132,9 @@ We recommend storing the `threadId` in your URL's query parameters to let users
 
 ### Messages Handling
 
-To enable messages handling, you need to pass the `messagesKey` option to the `useStream()` hook. 
+The `useStream()` hook will keep track of the message chunks received from the server and concatenate them together to form a complete message. The completed message chunks can be retrieved via the `messages` property.
 
-When enabled, the `useStream()` hook will keep track of the message chunks received from the server and concatenate them together to form a complete message. The completed message chunks can be retrieved via the `messages` property.
+By default, the `messagesKey` is set to `messages`, where it will append the new messages chunks to `values["messages"]`. If you store messages in a different key, you can change the value of `messagesKey`.
 
 ```tsx
 import type { Message } from "@langchain/langgraph-sdk";
@@ -152,9 +157,49 @@ export default function HomePage() {
 }
 ```
 
-### Branching Support
+Under the hood, the `useStream()` hook will use the `streamMode: "messages-key"` to receive a stream of messages (i.e. individual LLM tokens) from any LangChain chat model invocations inside your graph nodes. Learn more about messages streaming in the [How to stream messages from your graph](./stream_messages.md) guide.
 
-To enable branching, you need to enable messages handling. Pass the `messagesKey` option to the `useStream()` hook. For each message, you can use `getMessagesMetadata()` to get the first checkpoint from which the message has been first seen. You can then create a new run from the checkpoint preceding the first seen checkpoint to create a new branch in a thread.
+### Interrupts
+
+The `useStream()` hook exposes the `interrupt` property, which will be filled with the last interrupt from the thread. You can use interrupts to:
+
+- Render a confirmation UI before executing a node
+- Wait for human input, allowing agent to ask the user with clarifying questions
+
+Learn more about interrupts in the [How to handle interrupts](../../how-tos/human_in_the_loop/wait-user-input.ipynb) guide.
+
+```tsx
+const thread = useStream<
+  { messages: Message[] },
+  { InterruptType: string }
+>({
+  apiUrl: "http://localhost:2024",
+  assistantId: "agent",
+  messagesKey: "messages",
+});
+
+if (thread.interrupt) {
+  return (
+    <div>
+      Interrupted! {thread.interrupt.value}
+
+      <button
+        type="button"
+        onClick={() => {
+          // `resume` can be any value that the agent accepts
+          thread.submit(undefined, { command: { resume: true } });
+        }}
+      >
+        Resume
+      </button>
+    </div>
+  );
+}
+```
+
+### Branching
+
+For each message, you can use `getMessagesMetadata()` to get the first checkpoint from which the message has been first seen. You can then create a new run from the checkpoint preceding the first seen checkpoint to create a new branch in a thread.
 
 A branch can be created in following ways:
 
@@ -162,23 +207,12 @@ A branch can be created in following ways:
 2. Request a regeneration of a previous assistant message.
 
 ```tsx
-/* eslint-disable @typescript-eslint/no-floating-promises */
 "use client";
 
 import type { Message } from "@langchain/langgraph-sdk";
 import { useStream } from "@langchain/langgraph-sdk/react";
-import {
-  Annotation,
-  MessagesAnnotation,
-  type StateType,
-  type UpdateType,
-} from "@langchain/langgraph/web";
 import { useState } from "react";
 
-const AgentState = Annotation.Root({
-  ...MessagesAnnotation.spec,
-});
-
 function BranchSwitcher({
   branch,
   branchOptions,
@@ -256,10 +290,7 @@ function EditMessage({
 }
 
 export default function App() {
-  const thread = useStream<
-    StateType<typeof AgentState.spec>,
-    UpdateType<typeof AgentState.spec>
-  >({
+  const thread = useStream({
     apiUrl: "http://localhost:2024",
     assistantId: "agent",
     messagesKey: "messages",
@@ -282,7 +313,7 @@ export default function App() {
                   onEdit={(message) =>
                     thread.submit(
                       { messages: [message] },
-                      { checkpoint: parentCheckpoint }
+                      { checkpoint: parentCheckpoint },
                     )
                   }
                 />
@@ -337,13 +368,11 @@ export default function App() {
 }
 ```
 
+For advanced use cases you can use the `experimental_branchTree` property to get the tree representation of the thread, which can be used to render branching controls for non-message based graphs.
+
 ### TypeScript
 
-The `useStream()` hook is fully typed to help catch errors early and provide better IDE support. You can specify types for:
-
-- State shape
-- Update format
-- Custom events
+The `useStream()` hook is friendly for apps written in TypeScript and you can specify types for the state to get better type safety and IDE support.
 
 ```tsx
 // Define your types
@@ -352,25 +381,44 @@ type State = {
   context?: Record<string, unknown>;
 };
 
-type Update = {
-  messages: Message[] | Message;
-  context?: Record<string, unknown>;
-};
-
-type CustomEvent = {
-  type: "progress" | "debug";
-  payload: unknown;
-};
-
 // Use them with the hook
-const thread = useStream<State, Update, CustomEvent>({
+const thread = useStream<State>({
   apiUrl: "http://localhost:2024",
   assistantId: "agent",
   messagesKey: "messages",
 });
 ```
 
-If you're using LangGraph.js, you can reuse your graph's annotation types:
+You can also optionally specify types for different scenarios, such as:
+
+- `ConfigurableType`: Type for the `config.configurable` property (default: `Record<string, unknown>`)
+- `InterruptType`: Type for the interrupt value - i.e. contents of `interrupt(...)` function (default: `unknown`)
+- `CustomEventType`: Type for the custom events (default: `unknown`)
+- `UpdateType`: Type for the submit function (default: `Partial<State>`)
+
+```tsx
+
+const thread = useStream<State, {
+  UpdateType: {
+    messages: Message[] | Message;
+    context?: Record<string, unknown>;
+  };
+  InterruptType: string;
+  CustomEventType: {
+    type: "progress" | "debug";
+    payload: unknown;
+  };
+  ConfigurableType: {
+    model: string;
+  };
+}>({
+  apiUrl: "http://localhost:2024",
+  assistantId: "agent",
+  messagesKey: "messages",
+});
+```
+
+If you're using LangGraph.js, you can also reuse your graph's annotation types. However, make sure to only import the types of the annotation schema in order to avoid importing the entire LangGraph.js runtime (i.e. via `import type { ... }` directive).
 
 ```tsx
 import {
@@ -382,12 +430,12 @@ import {
 
 const AgentState = Annotation.Root({
   ...MessagesAnnotation.spec,
-  context: Annotation.Optional(Annotation.Any()),
+  context: Annotation<string>(),
 });
 
 const thread = useStream<
   StateType<typeof AgentState.spec>,
-  UpdateType<typeof AgentState.spec>
+  { UpdateType: UpdateType<typeof AgentState.spec> }
 >({
   apiUrl: "http://localhost:2024",
   assistantId: "agent",
@@ -403,7 +451,7 @@ The `useStream()` hook provides several callback options to help you respond to
 - `onFinish`: Called when the stream is finished.
 - `onUpdateEvent`: Called when an update event is received.
 - `onCustomEvent`: Called when a custom event is received. See [Custom events](../../concepts/streaming.md#custom) to learn how to stream custom events.
-- `onMetadataEvent`: Called when a metadata event is received.
+- `onMetadataEvent`: Called when a metadata event is received, which contains the Run ID and Thread ID.
 
 ## Learn More
 

docs/docs/cloud/how-tos/webhooks.md

@@ -1,142 +1,147 @@
-# Use Webhooks
+# Using Webhooks
 
-You may wish to use webhooks in your client, especially when using async streams in case you want to update something in your service once the API call to LangGraph Cloud has finished running. To do so, you will need to expose an endpoint that can accept POST requests, and then pass it to your API request in the "webhook" parameter.
+When working with LangGraph Cloud, you may want to use webhooks to receive updates after an API call completes. Webhooks are useful for triggering actions in your service once a run has finished processing. To implement this, you need to expose an endpoint that can accept `POST` requests and pass this endpoint as a `webhook` parameter in your API request.
 
-Currently, the SDK has not exposed this endpoint but you can access it through curl commands as follows.
+Currently, the SDK does not provide built-in support for defining webhook endpoints, but you can specify them manually using API requests.
 
-The following endpoints accept `webhook` as a parameter: 
+## Supported Endpoints
 
-- Create Run -> POST /thread/{thread_id}/runs
-- Create Thread Cron -> POST /thread/{thread_id}/runs/crons
-- Stream Run -> POST /thread/{thread_id}/runs/stream
-- Wait Run -> POST /thread/{thread_id}/runs/wait
-- Create Cron -> POST /runs/crons
-- Stream Run Stateless -> POST /runs/stream
-- Wait Run Stateless -> POST /runs/wait
+The following API endpoints accept a `webhook` parameter:
 
-In this example, we will show calling a webhook after streaming a run. 
+| Operation | HTTP Method | Endpoint |
+|-----------|------------|----------|
+| Create Run | `POST` | `/thread/{thread_id}/runs` |
+| Create Thread Cron | `POST` | `/thread/{thread_id}/runs/crons` |
+| Stream Run | `POST` | `/thread/{thread_id}/runs/stream` |
+| Wait Run | `POST` | `/thread/{thread_id}/runs/wait` |
+| Create Cron | `POST` | `/runs/crons` |
+| Stream Run Stateless | `POST` | `/runs/stream` |
+| Wait Run Stateless | `POST` | `/runs/wait` |
 
-## Setup
+In this guide, we’ll show how to trigger a webhook after streaming a run.
 
-First, let's setup our assistant and thread:
+## Setting Up Your Assistant and Thread
+
+Before making API calls, set up your assistant and thread.
 
 === "Python"
+```python
+from langgraph_sdk import get_client
 
-    ```python
-    from langgraph_sdk import get_client
+client = get_client(url=<DEPLOYMENT_URL>)
+assistant_id = "agent"
+thread = await client.threads.create()
+print(thread)
+```
 
-    client = get_client(url=<DEPLOYMENT_URL>)
-    # Using the graph deployed with the name "agent"
-    assistant_id = "agent"
-    # create thread
-    thread = await client.threads.create()
-    print(thread)
-    ```
+=== "JavaScript"
+```js
+import { Client } from "@langchain/langgraph-sdk";
 
-=== "Javascript"
-
-    ```js
-    import { Client } from "@langchain/langgraph-sdk";
-
-    const client = new Client({ apiUrl: <DEPLOYMENT_URL> });
-    // Using the graph deployed with the name "agent"
-    const assistantID = "agent";
-    // create thread
-    const thread = await client.threads.create();
-    console.log(thread);
-    ```
+const client = new Client({ apiUrl: <DEPLOYMENT_URL> });
+const assistantID = "agent";
+const thread = await client.threads.create();
+console.log(thread);
+```
 
 === "CURL"
+```bash
+curl --request POST \
+    --url <DEPLOYMENT_URL>/assistants/search \
+    --header 'Content-Type: application/json' \
+    --data '{ "limit": 10, "offset": 0 }' | jq -c 'map(select(.config == null or .config == {})) | .[0]' && \
+curl --request POST \
+    --url <DEPLOYMENT_URL>/threads \
+    --header 'Content-Type: application/json' \
+    --data '{}'
+```
 
-    ```bash
-    curl --request POST \
-        --url <DEPLOYMENT_URL>/assistants/search \
-        --header 'Content-Type: application/json' \
-        --data '{
-            "limit": 10,
-            "offset": 0
-        }' | jq -c 'map(select(.config == null or .config == {})) | .[0]' && \
-    curl --request POST \
-        --url <DEPLOYMENT_URL>/threads \
-        --header 'Content-Type: application/json' \
-        --data '{}'
-    ```
+### Example Response
+```json
+{
+    "thread_id": "9dde5490-2b67-47c8-aa14-4bfec88af217",
+    "created_at": "2024-08-30T23:07:38.242730+00:00",
+    "updated_at": "2024-08-30T23:07:38.242730+00:00",
+    "metadata": {},
+    "status": "idle",
+    "config": {},
+    "values": null
+}
+```
 
-Output:
+## Using a Webhook with a Graph Run
 
-    {
-        'thread_id': '9dde5490-2b67-47c8-aa14-4bfec88af217', 
-        'created_at': '2024-08-30T23:07:38.242730+00:00', 
-        'updated_at': '2024-08-30T23:07:38.242730+00:00', 
-        'metadata': {}, 
-        'status': 'idle', 
-        'config': {}, 
-        'values': None
-    }
+To use a webhook, specify the `webhook` parameter in your API request. When the run completes, LangGraph Cloud sends a `POST` request to the specified webhook URL.
 
-## Use graph with a webhook
-
-To invoke a run with a webhook, we specify the `webhook` parameter with the desired endpoint when creating a run. Webhook requests are triggered by the end of a run.
-
-For example, if we can receive requests at `https://my-server.app/my-webhook-endpoint`, we can pass this to `stream`:
+For example, if your server listens for webhook events at `https://my-server.app/my-webhook-endpoint`, include this in your request:
 
 === "Python"
+```python
+input = { "messages": [{ "role": "user", "content": "Hello!" }] }
 
-    ```python
-    # create input
-    input = { "messages": [{ "role": "user", "content": "Hello!" }] }
+async for chunk in client.runs.stream(
+    thread_id=thread["thread_id"],
+    assistant_id=assistant_id,
+    input=input,
+    stream_mode="events",
+    webhook="https://my-server.app/my-webhook-endpoint"
+):
+    pass
+```
 
-    async for chunk in client.runs.stream(
-        thread_id=thread["thread_id"],
-        assistant_id=assistant_id,
-        input=input,
-        stream_mode="events",
-        webhook="https://my-server.app/my-webhook-endpoint"
-    ):
-        # Do something with the stream output
-        pass
-    ```
+=== "JavaScript"
+```js
+const input = { messages: [{ role: "human", content: "Hello!" }] };
 
-=== "Javascript"
+const streamResponse = client.runs.stream(
+  thread["thread_id"],
+  assistantID,
+  {
+    input: input,
+    webhook: "https://my-server.app/my-webhook-endpoint"
+  }
+);
 
-    ```js
-    // create input
-    const input = { messages: [{ role: "human", content: "Hello!" }] };
-
-    // stream events
-    const streamResponse = client.runs.stream(
-      thread["thread_id"],
-      assistantID,
-      {
-        input: input,
-        webhook: "https://my-server.app/my-webhook-endpoint"
-      }
-    );
-    for await (const chunk of streamResponse) {
-      // Do something with the stream output
-    }
-    ```
+for await (const chunk of streamResponse) {
+  // Handle stream output
+}
+```
 
 === "CURL"
-
-    ```bash
-    curl --request POST \
-        --url <DEPLOYMENT_URL>/threads/<THREAD_ID>/runs/stream \
-        --header 'Content-Type: application/json' \
-        --data '{
-            "assistant_id": <ASSISTANT_ID>,
-            "input" : {"messages":[{"role": "user", "content": "Hello!"}]},
-            "webhook": "https://my-server.app/my-webhook-endpoint"
-        }'
-    ```
-
-The schema for the payload sent to `my-webhook-endpoint` is that of a [run](../../concepts/langgraph_server.md/#runs). See [API Reference](https://langchain-ai.github.io/langgraph/cloud/reference/api/api_ref.html#model/run) for more detail. Note that the run input, configuration, etc. are included in the `kwargs` field.
-
-### Signing webhook requests
-
-To sign the webhook requests, we can specify a token parameter in the webhook URL, e.g.,
-```
-https://my-server.app/my-webhook-endpoint?token=...
+```bash
+curl --request POST \
+    --url <DEPLOYMENT_URL>/threads/<THREAD_ID>/runs/stream \
+    --header 'Content-Type: application/json' \
+    --data '{
+        "assistant_id": <ASSISTANT_ID>,
+        "input": {"messages": [{"role": "user", "content": "Hello!"}]},
+        "webhook": "https://my-server.app/my-webhook-endpoint"
+    }'
 ```
 
-The server should then extract the token from the request's parameters and validate it before processing the payload.
+## Webhook Payload
+
+LangGraph Cloud sends webhook notifications in the format of a [Run](../../concepts/langgraph_server.md/#runs). See the [API Reference](https://langchain-ai.github.io/langgraph/cloud/reference/api/api_ref.html#model/run) for details. The request payload includes run input, configuration, and other metadata in the `kwargs` field.
+
+## Securing Webhooks
+
+To ensure only authorized requests hit your webhook endpoint, consider adding a security token as a query parameter:
+
+```
+https://my-server.app/my-webhook-endpoint?token=YOUR_SECRET_TOKEN
+```
+
+Your server should extract and validate this token before processing requests.
+
+## Testing Webhooks
+
+You can test your webhook using online services like:
+
+- **[Beeceptor](https://beeceptor.com/)** – Quickly create a test endpoint and inspect incoming webhook payloads.
+- **[Webhook.site](https://webhook.site/)** – View, debug, and log incoming webhook requests in real time.
+
+These tools help you verify that LangGraph Cloud is correctly triggering and sending webhooks to your service.
+
+---
+
+By following these steps, you can integrate webhooks into your LangGraph Cloud workflow, automating actions based on completed runs.

docs/docs/cloud/reference/cli.md

@@ -51,6 +51,7 @@ The LangGraph CLI requires a JSON configuration file with the following keys:
     | <span style="white-space: nowrap;">`node_version`</span>     | Specify `node_version: 20` to use LangGraph.js.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
     | <span style="white-space: nowrap;">`pip_config_file`</span>  | Path to `pip` config file.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
     | <span style="white-space: nowrap;">`dockerfile_lines`</span> | Array of additional lines to add to Dockerfile following the import from parent image.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
+    | <span style="white-space: nowrap;">`http`</span>            | HTTP server configuration with the following fields: <ul><li>`app`: Path to custom Starlette/FastAPI app (e.g., `"./src/agent/webapp.py:app"`). See [custom routes guide](../../how-tos/http/custom_routes.md).</li><li>`disable_assistants`: Disable `/assistants` routes</li><li>`disable_threads`: Disable `/threads` routes</li><li>`disable_runs`: Disable `/runs` routes</li><li>`disable_store`: Disable `/store` routes</li><li>`disable_meta`: Disable `/ok`, `/info`, `/metrics`, and `/docs` routes</li><li>`cors`: CORS configuration with fields for `allow_origins`, `allow_methods`, `allow_headers`, etc.</li></ul> |
 
 === "JS"
 

docs/docs/cloud/reference/env_var.md

@@ -2,6 +2,12 @@
 
 The LangGraph Cloud Server supports specific environment variables for configuring a deployment.
 
+## `DD_API_KEY`
+
+Specify `DD_API_KEY` (your [Datadog API Key](https://docs.datadoghq.com/account_management/api-app-keys/)) to automatically enable Datadog tracing for the deployment. Specify other [`DD_*` environment variables](https://ddtrace.readthedocs.io/en/stable/configuration.html) to configure the tracing instrumentation.
+
+If `DD_API_KEY` is specified, the application process is wrapped in the [`ddtrace-run` command](https://ddtrace.readthedocs.io/en/stable/installation_quickstart.html). Other `DD_*` environment variables (e.g. `DD_SITE`, `DD_ENV`, `DD_SERVICE`, `DD_TRACE_ENABLED`) are typically needed to properly configure the tracing instrumentation. See [`DD_*` environment variables](https://ddtrace.readthedocs.io/en/stable/configuration.html) for more details.
+
 ## `LANGCHAIN_TRACING_SAMPLING_RATE`
 
 Sampling rate for traces sent to LangSmith. Valid values: Any float between `0` and `1`.

docs/docs/concepts/breakpoints.md

@@ -83,7 +83,7 @@ node at a time or if you want to pause the graph execution at specific nodes.
 
 ### `NodeInterrupt` exception
 
-We recommend that you [**use the `interrupt` function instead**](#the-interrupt-function) of the `NodeInterrupt` exception if you're trying to implement
+We recommend that you [**use the `interrupt` function instead**][langgraph.types.interrupt] of the `NodeInterrupt` exception if you're trying to implement
 [human-in-the-loop](./human_in_the_loop.md) workflows. The `interrupt` function is easier to use and more flexible.
 
 ??? node "`NodeInterrupt` exception"

docs/docs/concepts/deployment_options.md

@@ -30,7 +30,7 @@ The guide below will explain the differences between the deployment options.
 
 !!! warning "Note"
 
-    The LangGraph Platform Deployments view (within LangSmith SaaS and self-hosted LangSmith) is not available for Self-Hosted Enterprise LangGraph deployments. Self-hosted LangGraph deployments are managed externally from LangSmith (e.g. there is no UI to manage these deployments).
+    The LangGraph Platform Deployments view is optionally available for Self-Hosted Enterprise LangGraph deployments. With one click, self-hosted LangGraph deployments can be deployed in the same Kubernetes cluster where a self-hosted LangSmith instance is deployed.
 
 With a Self-Hosted Enterprise deployment, you are responsible for managing the infrastructure, including setting up and maintaining required databases and Redis instances.
 
@@ -49,7 +49,7 @@ For more information, please see:
 
 !!! warning "Note"
 
-    The LangGraph Platform Deployments view (within LangSmith SaaS and self-hosted LangSmith) is not available for Self-Hosted Lite LangGraph deployments. Self-hosted LangGraph deployments are managed externally from LangSmith (e.g. there is no UI to manage these deployments).
+    The LangGraph Platform Deployments view is optionally available for Self-Hosted Lite LangGraph deployments. With one click, self-hosted LangGraph deployments can be deployed in the same Kubernetes cluster where a self-hosted LangSmith instance is deployed.
 
 The Self-Hosted Lite deployment option is a free (up to 1 million nodes executed per year), limited version of LangGraph Platform that you can run locally or in a self-hosted manner.
 

docs/docs/concepts/durable_execution.md

@@ -0,0 +1,152 @@
+# Durable Execution
+
+**Durable execution** is a technique in which a process or workflow saves its progress at key points, allowing it to pause and later resume exactly where it left off. This is particularly useful in scenarios that require [human-in-the-loop](./human_in_the_loop.md), where users can inspect, validate, or modify the process before continuing, and in long-running tasks that might encounter interruptions or errors (e.g., calls to an LLM timing out). By preserving completed work, durable execution enables a process to resume without reprocessing previous steps -- even after a significant delay (e.g., a week later). 
+
+LangGraph's built-in [persistence](./persistence.md) layer provides durable execution for workflows, ensuring that the state of each execution step is saved to a durable store. This capability guarantees that if a workflow is interrupted -- whether by a system failure or for [human-in-the-loop](./human_in_the_loop.md) interactions -- it can be resumed from its last recorded state.
+
+!!! tip
+
+    If you are using LangGraph with a checkpointer, you already have durable execution enabled. You can pause and resume workflows at any point, even after interruptions or failures.
+    To make the most of durable execution, ensure that your workflow is designed to be [deterministic](#determinism-and-consistent-replay) and [idempotent](#determinism-and-consistent-replay) and wrap any side effects or non-deterministic operations inside [tasks](./functional_api.md#task). You can use [tasks](./functional_api.md#task) from both the [StateGraph (Graph API)](./low_level.md) and the [Functional API](./functional_api.md).
+
+## Requirements
+
+To leverage durable execution in LangGraph, you need to:
+
+1. Enable [persistence](./persistence.md) in your workflow by specifying a [checkpointer](./persistence.md#checkpointer-libraries) that will save workflow progress.
+2. Specify a [thread identifier](./persistence.md#threads) when executing a workflow. This will track the execution history for a particular instance of the workflow.
+3. Wrap any non-deterministic operations (e.g., random number generation) or operations with side effects (e.g., file writes, API calls) inside [tasks][langgraph.func.task] to ensure that when a workflow is resumed, these operations are not repeated for the particular run, and instead their results are retrieved from the persistence layer. For more information, see [Determinism and Consistent Replay](#determinism-and-consistent-replay).
+
+## Determinism and Consistent Replay
+
+When you resume a workflow run, the code does **NOT** resume from the **same line of code** where execution stopped; instead, it will identify an appropriate [starting point](#starting-points-for-resuming-workflows) from which to pick up where it left off. This means that the workflow will replay all steps from the [starting point](#starting-points-for-resuming-workflows) until it reaches the point where it was stopped.
+
+As a result, when you are writing a workflow for durable execution, you must wrap any non-deterministic operations (e.g., random number generation) and any operations with side effects (e.g., file writes, API calls) inside [tasks](./functional_api.md#task) or [nodes](./low_level.md#nodes).
+
+To ensure that your workflow is deterministic and can be consistently replayed, follow these guidelines:
+
+- **Avoid Repeating Work**:  If a [node](./low_level.md#nodes) contains multiple operations with side effects (e.g., logging, file writes, or network calls), wrap each operation in a separate **task**. This ensures that when the workflow is resumed, the operations are not repeated, and their results are retrieved from the persistence layer.
+- **Encapsulate Non-Deterministic Operations:**  Wrap any code that might yield non-deterministic results (e.g., random number generation) inside **tasks** or **nodes**. This ensures that, upon resumption, the workflow follows the exact recorded sequence of steps with the same outcomes.
+- **Use Idempotent Operations**: When possible ensure that side effects (e.g., API calls, file writes) are idempotent. This means that if an operation is retried after a failure in the workflow, it will have the same effect as the first time it was executed. This is particularly important for operations that result in data writes. In the event that a **task** starts but fails to complete successfully, the workflow's resumption will re-run the **task**, relying on recorded outcomes to maintain consistency. Use idempotency keys or verify existing results to avoid unintended duplication, ensuring a smooth and predictable workflow execution.
+
+For some examples of pitfalls to avoid, see the [Common Pitfalls](./functional_api.md#common-pitfalls) section in the functional API, which shows
+how to structure your code using **tasks** to avoid these issues. The same principles apply to the [StateGraph (Graph API)][langgraph.graph.state.StateGraph].
+
+## Using tasks in nodes
+
+If a [node](./low_level.md#nodes) contains multiple operations, you may find it easier to convert each operation into a **task** rather than refactor the operations into individual nodes.
+
+=== "Original"
+
+    ```python
+    from typing import NotRequired
+    from typing_extensions import TypedDict
+    import uuid
+
+    from langgraph.checkpoint.memory import MemorySaver
+    from langgraph.graph import StateGraph, START, END
+    import requests
+
+    # Define a TypedDict to represent the state
+    class State(TypedDict):
+        url: str
+        result: NotRequired[str]
+
+    def call_api(state: State):
+        """Example node that makes an API request."""
+        # highlight-next-line
+        result = requests.get(state['url']).text[:100]  # Side-effect
+        return {
+            "result": result
+        }
+
+    # Create a StateGraph builder and add a node for the call_api function
+    builder = StateGraph(State)
+    builder.add_node("call_api", call_api)
+
+    # Connect the start and end nodes to the call_api node
+    builder.add_edge(START, "call_api")
+    builder.add_edge("call_api", END)
+
+    # Specify a checkpointer
+    checkpointer = MemorySaver()
+
+    # Compile the graph with the checkpointer
+    graph = builder.compile(checkpointer=checkpointer)
+
+    # Define a config with a thread ID.
+    thread_id = uuid.uuid4()
+    config = {"configurable": {"thread_id": thread_id}}
+
+    # Invoke the graph
+    graph.invoke({"url": "https://www.example.com"}, config)
+    ```
+
+=== "With task"
+
+    ```python
+    from typing import NotRequired
+    from typing_extensions import TypedDict
+    import uuid
+
+    from langgraph.checkpoint.memory import MemorySaver
+    from langgraph.func import task
+    from langgraph.graph import StateGraph, START, END
+    import requests
+
+    # Define a TypedDict to represent the state
+    class State(TypedDict):
+        urls: list[str]
+        result: NotRequired[list[str]]
+
+
+    @task
+    def _make_request(url: str):
+        """Make a request."""
+        # highlight-next-line
+        return requests.get(url).text[:100]
+
+    def call_api(state: State):
+        """Example node that makes an API request."""
+        # highlight-next-line
+        requests = [_make_request(url) for url in state['urls']]
+        results = [request.result() for request in requests]
+        return {
+            "results": results
+        }
+
+    # Create a StateGraph builder and add a node for the call_api function
+    builder = StateGraph(State)
+    builder.add_node("call_api", call_api)
+
+    # Connect the start and end nodes to the call_api node
+    builder.add_edge(START, "call_api")
+    builder.add_edge("call_api", END)
+
+    # Specify a checkpointer
+    checkpointer = MemorySaver()
+
+    # Compile the graph with the checkpointer
+    graph = builder.compile(checkpointer=checkpointer)
+
+    # Define a config with a thread ID.
+    thread_id = uuid.uuid4()
+    config = {"configurable": {"thread_id": thread_id}}
+
+    # Invoke the graph
+    graph.invoke({"urls": ["https://www.example.com"]}, config)
+    ```
+
+## Resuming Workflows
+
+Once you have enabled durable execution in your workflow, you can resume execution for the following scenarios:
+
+- **Pausing and Resuming Workflows:** Use the [interrupt][langgraph.types.interrupt] function to pause a workflow at specific points and the [Command][langgraph.types.Command] primitive to resume it with updated state. See [**Human-in-the-Loop**](./human_in_the_loop.md) for more details.
+- **Recovering from Failures:** Automatically resume workflows from the last successful checkpoint after an exception (e.g., LLM provider outage). This involves executing the workflow with the same thread identifier by providing it with a `None` as the input value (see this [example](./functional_api.md#resuming-after-an-error) with the functional API).
+
+## Starting Points for Resuming Workflows
+
+* If you're using a [StateGraph (Graph API)][langgraph.graph.state.StateGraph], the starting point is the beginning of the [**node**](./low_level.md#nodes) where execution stopped. 
+* If you're making a subgraph call inside a node, the starting point will be the **parent** node that called the subgraph that was halted.
+Inside the subgraph, the starting point will be the specific [**node**](./low_level.md#nodes) where execution stopped.
+* If you're using the Functional API, the starting point is the beginning of the [**entrypoint**](./functional_api.md#entrypoint) where execution stopped.

docs/docs/concepts/faq.md

@@ -62,3 +62,9 @@ Yes! You can use LangGraph with any LLMs. The main reason we use LLMs that suppo
 ## Does LangGraph work with OSS LLMs?
 
 Yes! LangGraph is totally ambivalent to what LLMs are used under the hood. The main reason we use closed LLMs in most of the tutorials is that they seamlessly support tool calling, while OSS LLMs often don't. But tool calling is not necessary (see [this section](#does-langgraph-work-with-llms-that-dont-support-tool-calling)) so you can totally use LangGraph with OSS LLMs.
+
+## Can I use LangGraph Studio without logging to LangSmith
+
+Yes! You can use the [development version of LangGraph Server](../tutorials/langgraph-platform/local-server.md) to run the backend locally.
+This will connect to the studio frontend hosted as part of LangSmith.
+If you set an environment variable of `LANGSMITH_TRACING=false` then no traces will be sent to LangSmith.

docs/docs/concepts/functional_api.md

@@ -829,7 +829,8 @@ from langgraph.checkpoint.memory import MemorySaver
 from langgraph.func import entrypoint, task
 from langgraph.types import StreamWriter
 
-# Global variable to track the number of attempts
+# This variable is just used for demonstration purposes to simulate a network failure.
+# It's not something you will have in your actual code.
 attempts = 0
 
 @task()

docs/docs/concepts/human_in_the_loop.md

@@ -647,19 +647,15 @@ def node_in_parent_graph(state: State):
       This will print out
 
       ```pycon
-      --- First invocation ---
-      In parent node: {'foo': 'bar'}
       Entered `parent_node` a total of 1 times
       Entered `node_in_subgraph` a total of 1 times
       Entered human_node in sub-graph a total of 1 times
-      {'__interrupt__': (Interrupt(value='what is your name?', resumable=True, ns=['parent_node:0b23d72f-aaba-0329-1a59-ca4f3c8bad3b', 'human_node:25df717c-cb80-57b0-7410-44e20aac8f3c'], when='during'),)}
-
+      {'__interrupt__': (Interrupt(value='what is your name?', resumable=True, ns=['parent_node:4c3a0248-21f0-1287-eacf-3002bc304db4', 'human_node:2fe86d52-6f70-2a3f-6b2f-b1eededd6348'], when='during'),)}
       --- Resuming ---
-      In parent node: {'foo': 'bar'}
       Entered `parent_node` a total of 2 times
       Entered human_node in sub-graph a total of 2 times
       Got an answer of 35
-      {'parent_node': None} 
+      {'parent_node': {'state_counter': 1}}
       ```
 
 

docs/docs/concepts/index.md

@@ -7,7 +7,7 @@ description: Conceptual Guide for LangGraph
 
 This guide provides explanations of the key concepts behind the LangGraph framework and AI applications more broadly.
 
-We recommend that you go through at least the [Quick Start](../tutorials/introduction.ipynb) before diving into the conceptual guide. This will provide practical context that will make it easier to understand the concepts discussed here.
+We recommend that you go through at least the [Quickstart](../tutorials/introduction.ipynb) before diving into the conceptual guide. This will provide practical context that will make it easier to understand the concepts discussed here.
 
 The conceptual guide does not cover step-by-step instructions or specific implementation examples — those are found in the [Tutorials](../tutorials/index.md) and [How-to guides](../how-tos/index.md). For detailed reference material, please see the [API reference](../reference/index.md).
 
@@ -29,6 +29,8 @@ The conceptual guide does not cover step-by-step instructions or specific implem
 - [Memory](memory.md): Memory in AI applications refers to the ability to process, store, and effectively recall information from past interactions. With memory, your agents can learn from feedback and adapt to users' preferences.
 - [Streaming](streaming.md): Streaming is crucial for enhancing the responsiveness of applications built on LLMs. By displaying output progressively, even before a complete response is ready, streaming significantly improves user experience (UX), particularly when dealing with the latency of LLMs.
 - [Functional API](functional_api.md): `@entrypoint` and `@task` decorators that allow you to add LangGraph functionality to an existing codebase.
+- [Durable Execution](durable_execution.md): LangGraph's built-in [persistence](./persistence.md) layer provides durable execution for workflows, ensuring that the state of each execution step is saved to a durable store. 
+- [Pregel](pregel.md): Pregel is LangGraph's runtime, which is responsible for managing the execution of LangGraph applications.
 - [FAQ](faq.md): Frequently asked questions about LangGraph.
 
 ## LangGraph Platform
@@ -46,6 +48,7 @@ The LangGraph Platform offers a few different deployment options described in th
 
 - [Why LangGraph Platform?](./langgraph_platform.md): The LangGraph platform is an opinionated way to deploy and manage LangGraph applications. This guide provides an overview of the key features and concepts behind LangGraph Platform.
 - [Platform Architecture](./platform_architecture.md): A high-level overview of the architecture of the LangGraph Platform.
+- [Scalability and Resilience](./scalability_and_resilience.md): LangGraph Platform is designed to be scalable and resilient. This document explains how the platform achieves this.
 - [Deployment Options](./deployment_options.md): LangGraph Platform offers four deployment options: [Self-Hosted Lite](./self_hosted.md#self-hosted-lite), [Self-Hosted Enterprise](./self_hosted.md#self-hosted-enterprise), [bring your own cloud (BYOC)](./bring_your_own_cloud.md), and [Cloud SaaS](./langgraph_cloud.md). This guide explains the differences between these options, and which Plans they are available on.
 - [Plans](./plans.md): LangGraph Platforms offer three different plans: Developer, Plus, Enterprise. This guide explains the differences between these options, what deployment options are available for each, and how to sign up for each one.
 - [Template Applications](./template_applications.md): Reference applications designed to help you get started quickly when building with LangGraph.

docs/docs/concepts/langgraph_cloud.md

@@ -80,6 +80,22 @@ A high-level diagram of a Cloud SaaS deployment.
 
 ![diagram](img/langgraph_cloud_architecture.png)
 
+## Whitelisting IP Addresses
+
+All traffic from `LangGraph Platform` deployments created after January 6th 2025 will come through a NAT gateway.
+This NAT gateway will have several static ip addresses depending on the region you are deploying in. Refer to the table below for the list of IP addresses to whitelist:
+
+| US             | EU             |
+|----------------|----------------|
+| 35.197.29.146  | 34.13.192.67   |
+| 34.145.102.123 | 34.147.105.64  |
+| 34.169.45.153  | 34.90.22.166   |
+| 34.82.222.17   | 34.147.36.213  |
+| 35.227.171.135 | 34.32.137.113  | 
+| 34.169.88.30   | 34.91.238.184  |
+| 34.19.93.202   | 35.204.101.241 |
+| 34.19.34.50    | 35.204.48.32   |
+
 ## Related
 
 - [Deployment Options](./deployment_options.md)

docs/docs/concepts/low_level.md

@@ -310,7 +310,7 @@ graph.add_conditional_edges(START, routing_function, {True: "node_b", False: "no
 
 ## `Send`
 
-By default, `Nodes` and `Edges` are defined ahead of time and operate on the same shared state. However, there can be cases where the exact edges are not known ahead of time and/or you may want different versions of `State` to exist at the same time. A common example of this is with `map-reduce` design patterns. In this design pattern, a first node may generate a list of objects, and you may want to apply some other node to all those objects. The number of objects may be unknown ahead of time (meaning the number of edges may not be known) and the input `State` to the downstream `Node` should be different (one for each generated object).
+By default, `Nodes` and `Edges` are defined ahead of time and operate on the same shared state. However, there can be cases where the exact edges are not known ahead of time and/or you may want different versions of `State` to exist at the same time. A common example of this is with [map-reduce](https://langchain-ai.github.io/langgraph/how-tos/map-reduce/) design patterns. In this design pattern, a first node may generate a list of objects, and you may want to apply some other node to all those objects. The number of objects may be unknown ahead of time (meaning the number of edges may not be known) and the input `State` to the downstream `Node` should be different (one for each generated object).
 
 To support this design pattern, LangGraph supports returning [`Send`][langgraph.types.Send] objects from conditional edges. `Send` takes two arguments: first is the name of the node, and second is the state to pass to that node.
 

docs/docs/concepts/multi_agent.md

@@ -112,6 +112,7 @@ In this architecture, agents are defined as graph nodes. Each agent can communic
 ```python
 from typing import Literal
 from langchain_openai import ChatOpenAI
+from langgraph.types import Command
 from langgraph.graph import StateGraph, MessagesState, START, END
 
 model = ChatOpenAI()
@@ -158,6 +159,7 @@ In this architecture, we define agents as nodes and add a supervisor node (LLM)
 ```python
 from typing import Literal
 from langchain_openai import ChatOpenAI
+from langgraph.types import Command
 from langgraph.graph import StateGraph, MessagesState, START, END
 
 model = ChatOpenAI()

docs/docs/concepts/pregel.md

@@ -0,0 +1,347 @@
+# LangGraph's Runtime (Pregel)
+
+[Pregel][langgraph.pregel.Pregel] implements LangGraph's runtime, managing the execution of LangGraph applications.
+
+Compiling a [StateGraph][langgraph.graph.StateGraph] or creating an [entrypoint][langgraph.func.entrypoint] produces a [Pregel][langgraph.pregel.Pregel] instance that can be invoked with input.
+
+This guide explains the runtime at a high level and provides instructions for directly implementing applications with Pregel.
+
+> **Note:** The [Pregel][langgraph.pregel.Pregel] runtime is named after [Google's Pregel algorithm](https://research.google/pubs/pub37252/), which describes an efficient method for large-scale parallel computation using graphs.
+
+## Overview
+
+In LangGraph, Pregel combines [**actors**](https://en.wikipedia.org/wiki/Actor_model) and **channels** into a single application. **Actors** read data from channels and write data to channels. Pregel organizes the execution of the application into multiple steps, following the **Pregel Algorithm**/**Bulk Synchronous Parallel** model.
+
+Each step consists of three phases:
+
+- **Plan**: Determine which **actors** to execute in this step. For example, in the first step, select the **actors** that subscribe to the special **input** channels; in subsequent steps, select the **actors** that subscribe to channels updated in the previous step.
+- **Execution**: Execute all selected **actors** in parallel, until all complete, or one fails, or a timeout is reached. During this phase, channel updates are invisible to actors until the next step.
+- **Update**: Update the channels with the values written by the **actors** in this step.
+
+Repeat until no **actors** are selected for execution, or a maximum number of steps is reached.
+
+## Actors 
+
+An **actor** is a [PregelNode][langgraph.pregel.read.PregelNode]. It subscribes to channels, reads data from them, and writes data to them. It can be thought of as an **actor** in the Pregel algorithm. [PregelNodes][langgraph.pregel.read.PregelNode] implement LangChain's Runnable interface.
+
+## Channels
+
+Channels are used to communicate between actors (PregelNodes). Each channel has a value type, an update type, and an update function – which takes a sequence of updates and modifies the stored value. Channels can be used to send data from one chain to another, or to send data from a chain to itself in a future step. LangGraph provides a number of built-in channels:
+
+### Basic channels: LastValue and Topic
+
+- [LastValue][langgraph.channels.LastValue]: The default channel, stores the last value sent to the channel, useful for input and output values, or for sending data from one step to the next.
+- [Topic][langgraph.channels.Topic]: A configurable PubSub Topic, useful for sending multiple values between **actors**, or for accumulating output. Can be configured to deduplicate values or to accumulate values over the course of multiple steps.
+
+### Advanced channels: Context and BinaryOperatorAggregate
+
+- `Context`: exposes the value of a context manager, managing its lifecycle. Useful for accessing external resources that require setup and/or teardown; e.g., `client = Context(httpx.Client)`.
+- [BinaryOperatorAggregate][langgraph.channels.BinaryOperatorAggregate]: stores a persistent value, updated by applying a binary operator to the current value and each update sent to the channel, useful for computing aggregates over multiple steps; e.g.,`total = BinaryOperatorAggregate(int, operator.add)`
+
+## Examples
+
+While most users will interact with Pregel through the [StateGraph][langgraph.graph.StateGraph] API or 
+the [entrypoint][langgraph.func.entrypoint] decorator, it is possible to interact with Pregel directly.
+
+Below are a few different examples to give you a sense of the Pregel API.
+
+=== "Single node"
+
+    ```python
+
+    from langgraph.channels import EphemeralValue
+    from langgraph.pregel import Pregel, Channel 
+
+    node1 = (
+        Channel.subscribe_to("a")
+        | (lambda x: x + x)
+        | Channel.write_to("b")
+    )
+
+    app = Pregel(
+        nodes={"node1": node1},
+        channels={
+            "a": EphemeralValue(str),
+            "b": EphemeralValue(str),
+        },
+        input_channels=["a"],
+        output_channels=["b"],
+    )
+
+    app.invoke({"a": "foo"})
+    ```
+
+    ```con
+    {'b': 'foofoo'}
+    ```
+
+=== "Multiple nodes"
+
+    ```python
+    from langgraph.channels import LastValue, EphemeralValue
+    from langgraph.pregel import Pregel, Channel 
+
+    node1 = (
+        Channel.subscribe_to("a")
+        | (lambda x: x + x)
+        | Channel.write_to("b")
+    )
+
+    node2 = (
+        Channel.subscribe_to("b")
+        | (lambda x: x + x)
+        | Channel.write_to("c")
+    )
+
+
+    app = Pregel(
+        nodes={"node1": node1, "node2": node2},
+        channels={
+            "a": EphemeralValue(str),
+            "b": LastValue(str),
+            "c": EphemeralValue(str),
+        },
+        input_channels=["a"],
+        output_channels=["b", "c"],
+    )
+
+    app.invoke({"a": "foo"})
+    ```
+
+    ```con
+    {'b': 'foofoo', 'c': 'foofoofoofoo'}
+    ```
+
+=== "Topic"
+
+    ```python
+    from langgraph.channels import EphemeralValue, Topic
+    from langgraph.pregel import Pregel, Channel 
+
+    node1 = (
+        Channel.subscribe_to("a")
+        | (lambda x: x + x)
+        | {
+            "b": Channel.write_to("b"),
+            "c": Channel.write_to("c")
+        }
+    )
+
+    node2 = (
+        Channel.subscribe_to("b")
+        | (lambda x: x + x)
+        | {
+            "c": Channel.write_to("c"),
+        }
+    )
+
+    app = Pregel(
+        nodes={"node1": node1, "node2": node2},
+        channels={
+            "a": EphemeralValue(str),
+            "b": EphemeralValue(str),
+            "c": Topic(str, accumulate=True),
+        },
+        input_channels=["a"],
+        output_channels=["c"],
+    )
+
+    app.invoke({"a": "foo"})
+    ```
+
+    ```pycon
+    {'c': ['foofoo', 'foofoofoofoo']}
+    ```
+
+=== "BinaryOperatorAggregate"
+
+    This examples demonstrates how to use the BinaryOperatorAggregate channel to implement a reducer.
+
+    ```python
+    from langgraph.channels import EphemeralValue, BinaryOperatorAggregate
+    from langgraph.pregel import Pregel, Channel
+
+
+    node1 = (
+        Channel.subscribe_to("a")
+        | (lambda x: x + x)
+        | {
+            "b": Channel.write_to("b"),
+            "c": Channel.write_to("c")
+        }
+    )
+
+    node2 = (
+        Channel.subscribe_to("b")
+        | (lambda x: x + x)
+        | {
+            "c": Channel.write_to("c"),
+        }
+    )
+
+    def reducer(current, update):
+        if current:
+            return current + " | " + "update"
+        else:
+            return update
+
+    app = Pregel(
+        nodes={"node1": node1, "node2": node2},
+        channels={
+            "a": EphemeralValue(str),
+            "b": EphemeralValue(str),
+            "c": BinaryOperatorAggregate(str, operator=reducer),
+        },
+        input_channels=["a"],
+        output_channels=["c"],
+    )
+
+    app.invoke({"a": "foo"})
+    ```
+    
+    
+=== "Cycle"
+
+    This example demonstrates how to introduce a cycle in the graph, by having
+    a chain write to a channel it subscribes to. Execution will continue
+    until a None value is written to the channel.
+
+    ```python
+    from langgraph.channels import EphemeralValue
+    from langgraph.pregel import Pregel, Channel, ChannelWrite, ChannelWriteEntry
+
+    example_node = (
+        Channel.subscribe_to("value")
+        | (lambda x: x + x if len(x) < 10 else None)
+        | ChannelWrite(writes=[ChannelWriteEntry(channel="value", skip_none=True)])
+    )
+
+    app = Pregel(
+        nodes={"example_node": example_node},
+        channels={
+            "value": EphemeralValue(str),
+        },
+        input_channels=["value"],
+        output_channels=["value"],
+    )
+
+    app.invoke({"value": "a"})
+    ```
+
+    ```pycon
+    {'value': 'aaaaaaaaaaaaaaaa'}
+    ```
+
+## High-level API
+
+LangGraph provides two high-level APIs for creating a Pregel application: the [StateGraph (Graph API)](./low_level.md) and the [Functional API](functional_api.md).
+
+
+=== "StateGraph (Graph API)"
+
+    The [StateGraph (Graph API)][langgraph.graph.StateGraph] is a higher-level abstraction that simplifies the creation of Pregel applications. It allows you to define a graph of nodes and edges. When you compile the graph, the StateGraph API automatically creates the Pregel application for you.
+
+    ```python
+    from typing import TypedDict, Optional
+
+    from langgraph.constants import START
+    from langgraph.graph import StateGraph
+
+    class Essay(TypedDict):
+        topic: str
+        content: Optional[str]
+        score: Optional[float]
+
+    def write_essay(essay: Essay):
+        return {
+            "content": f"Essay about {essay['topic']}",
+        }
+
+    def score_essay(essay: Essay):
+        return {
+            "score": 10
+        }
+
+    builder = StateGraph(Essay)
+    builder.add_node(write_essay)
+    builder.add_node(score_essay)
+    builder.add_edge(START, "write_essay")
+
+    # Compile the graph. 
+    # This will return a Pregel instance.
+    graph = builder.compile()
+    ```
+
+    The compiled Pregel instance will be associated with a list of nodes and channels. You can inspect the nodes and channels by printing them.
+
+    ```python
+    print(graph.nodes)
+    ```
+
+    You will see something like this:
+
+    ```pycon 
+    {'__start__': <langgraph.pregel.read.PregelNode at 0x7d05e3ba1810>,
+     'write_essay': <langgraph.pregel.read.PregelNode at 0x7d05e3ba14d0>,
+     'score_essay': <langgraph.pregel.read.PregelNode at 0x7d05e3ba1710>}
+     ```
+
+    ```python
+    print(graph.channels)
+    ```
+
+    You should see something like this
+
+    ```pycon
+    {'topic': <langgraph.channels.last_value.LastValue at 0x7d05e3294d80>,
+     'content': <langgraph.channels.last_value.LastValue at 0x7d05e3295040>,
+     'score': <langgraph.channels.last_value.LastValue at 0x7d05e3295980>,
+     '__start__': <langgraph.channels.ephemeral_value.EphemeralValue at 0x7d05e3297e00>,
+     'write_essay': <langgraph.channels.ephemeral_value.EphemeralValue at 0x7d05e32960c0>,
+     'score_essay': <langgraph.channels.ephemeral_value.EphemeralValue at 0x7d05e2d8ab80>,
+     'branch:__start__:__self__:write_essay': <langgraph.channels.ephemeral_value.EphemeralValue at 0x7d05e32941c0>,
+     'branch:__start__:__self__:score_essay': <langgraph.channels.ephemeral_value.EphemeralValue at 0x7d05e2d88800>,
+     'branch:write_essay:__self__:write_essay': <langgraph.channels.ephemeral_value.EphemeralValue at 0x7d05e3295ec0>,
+     'branch:write_essay:__self__:score_essay': <langgraph.channels.ephemeral_value.EphemeralValue at 0x7d05e2d8ac00>,
+     'branch:score_essay:__self__:write_essay': <langgraph.channels.ephemeral_value.EphemeralValue at 0x7d05e2d89700>,
+     'branch:score_essay:__self__:score_essay': <langgraph.channels.ephemeral_value.EphemeralValue at 0x7d05e2d8b400>,
+     'start:write_essay': <langgraph.channels.ephemeral_value.EphemeralValue at 0x7d05e2d8b280>}
+    ```
+
+=== "Functional API"
+
+    In the [Functional API](functional_api.md), you can use an [`entrypoint`][langgraph.func.entrypoint] to create
+    a Pregel application. The `entrypoint` decorator allows you to define a function that takes input and returns output. 
+
+    ```python
+    from typing import TypedDict, Optional
+
+    from langgraph.checkpoint.memory import InMemorySaver
+    from langgraph.func import entrypoint
+
+    class Essay(TypedDict):
+        topic: str
+        content: Optional[str]
+        score: Optional[float]
+
+
+    checkpointer = InMemorySaver()
+
+    @entrypoint(checkpointer=checkpointer)
+    def write_essay(essay: Essay):
+        return {
+            "content": f"Essay about {essay['topic']}",
+        }
+
+    print("Nodes: ")
+    print(write_essay.nodes)
+    print("Channels: ")
+    print(write_essay.channels)
+    ```
+
+    ```pycon
+    Nodes: 
+    {'write_essay': <langgraph.pregel.read.PregelNode object at 0x7d05e2f9aad0>}
+    Channels: 
+    {'__start__': <langgraph.channels.ephemeral_value.EphemeralValue object at 0x7d05e2c906c0>, '__end__': <langgraph.channels.last_value.LastValue object at 0x7d05e2c90c40>, '__previous__': <langgraph.channels.last_value.LastValue object at 0x7d05e1007280>}
+    ```

docs/docs/concepts/scalability_and_resilience.md

@@ -0,0 +1,35 @@
+# LangGraph Platform: Scalability & Resilience
+
+LangGraph Platform is designed to scale horizontally with your workload. Each instance of the service is stateless, and keeps no resources in memory. The service is designed to gracefully handle new instances being added or removed, including hard shutdown cases.
+
+## Server scalability
+
+As you add more instances to a service, they will share the HTTP load as long as an appropriate load balancer mechanism is placed in front of them. In most deployment modalities we configure a load balancer for the service automatically. In the “self-hosted without control plane” modality it’s your responsibility to add a load balancer. Since the instances are stateless any load balancing strategy will work, no session stickiness is needed, or recommended. Any instance of the server can communicate with any queue instance (through Redis PubSub), meaning that requests to cancel or stream an in-progress run can be handled by any arbitrary instance.
+
+## Queue scalability
+
+As you add more instances to a service, they will increase run throughput linearly, as each instance is configured to handle a set number of concurrent runs (by default 10). Each attempt for each run will be handled by a single instance, with exactly-once semantics enforced through Postgres’s MVCC model (refer to section below for crash resilience details). Attempts that fail due to transient database errors are retried up to 3 times. We do not make use of long-lived transactions or locks, this enables us to make more efficient use of Postgres resources.
+
+## Resilience
+
+While a run is being handled by a queue instance, a periodic heartbeat timestamp will be recorded in Redis by that queue worker.
+
+When a graceful shutdown request is received (SIGINT) an instance enters shutdown mode, which
+
+- stops accepting new HTTP requests
+- gives any in-progress runs a limited number of seconds to finish (if not finished it will be put back in the queue)
+- stops the instance from picking up more runs from the queue
+
+If a hard shutdown occurs, eg. due to a server crash, or an infra failure, any runs that were in progress will be picked up by a periodic sweeper task that looks for in-progress runs that have breached their heartbeat window, which will put them back in the queue for another instance to pick them up.
+
+## Postgres resilience
+
+For deployment modalities where we manage the Postgres database we have periodic backups, continuously replicated standby replicas for automatic failover. Optionally, on request, we can also setup read replicas as well as other advanced failover capabilities.
+
+All communication with Postgres implements retries for retry-able errors. If Postgres is momentarily unavailable, such as during a database restart, most/all traffic should continue to succeed. Prolonged failure of the Postgres instance will switch traffic to the failover replica. If the failover replica also fails before the primary is brought back online the service would become unavailable.
+
+## Redis resilience
+
+All data that requires durable storage is stored in Postgres, not Redis. Redis is used only for ephemeral metadata, and communication between instances. Refer to the [architecture](./platform_architecture.md) page for more details on how we use Redis. Therefore we place no durability requirements on Redis.
+
+All communication with Redis implements retries for retry-able errors. If Redis is momentarily unavailable, such as during a database restart, most/all traffic should continue to succeed. Prolonged failure of Redis will render the LGP service unavailable.

docs/docs/concepts/self_hosted.md

@@ -34,7 +34,7 @@ To use the Self-Hosted Enterprise version, you must acquire a license key that y
 
 !!! warning "Note"
 
-    The LangGraph Platform Deployments view (within LangSmith SaaS and self-hosted LangSmith) is not available for Self-Hosted Lite or Self-Hosted Enterprise LangGraph deployments. Self-hosted LangGraph deployments are managed externally from LangSmith (e.g. there is no UI to manage these deployments).
+    The LangGraph Platform Deployments view is optionally available for Self-Hosted LangGraph deployments. With one click, self-hosted LangGraph deployments can be deployed in the same Kubernetes cluster where a self-hosted LangSmith instance is deployed.
 
 For step-by-step instructions, see [How to set up a self-hosted deployment of LangGraph](../how-tos/deploy-self-hosted.md).
 

docs/docs/how-tos/agent-handoffs.ipynb

@@ -78,7 +78,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install -U langgraph langchain-anthropic"
+    "%pip install -U langgraph langgraph-prebuilt langchain-anthropic"
    ]
   },
   {

docs/docs/how-tos/async.ipynb

@@ -67,7 +67,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install --quiet -U langgraph langchain_anthropic"
+    "%pip install --quiet -U langgraph langgraph-prebuilt langchain_anthropic"
    ]
   },
   {

docs/docs/how-tos/autogen-integration-functional.ipynb

@@ -170,8 +170,6 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "from typing import Literal, TypedDict\n",
-    "\n",
     "from langchain_core.messages import convert_to_openai_messages, BaseMessage\n",
     "from langgraph.func import entrypoint, task\n",
     "from langgraph.graph import add_messages\n",
@@ -224,12 +222,12 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "\u001b[33muser_proxy\u001b[0m (to assistant):\n",
+      "\u001B[33muser_proxy\u001B[0m (to assistant):\n",
       "\n",
       "Find numbers between 10 and 30 in fibonacci sequence\n",
       "\n",
       "--------------------------------------------------------------------------------\n",
-      "\u001b[33massistant\u001b[0m (to user_proxy):\n",
+      "\u001B[33massistant\u001B[0m (to user_proxy):\n",
       "\n",
       "To find numbers between 10 and 30 in the Fibonacci sequence, we can generate the Fibonacci sequence and check which numbers fall within this range. Here's a plan:\n",
       "\n",
@@ -255,9 +253,9 @@
       "This script will print the Fibonacci numbers between 10 and 30. Please execute the code to see the result.\n",
       "\n",
       "--------------------------------------------------------------------------------\n",
-      "\u001b[31m\n",
-      ">>>>>>>> EXECUTING CODE BLOCK 0 (inferred language is python)...\u001b[0m\n",
-      "\u001b[33muser_proxy\u001b[0m (to assistant):\n",
+      "\u001B[31m\n",
+      ">>>>>>>> EXECUTING CODE BLOCK 0 (inferred language is python)...\u001B[0m\n",
+      "\u001B[33muser_proxy\u001B[0m (to assistant):\n",
       "\n",
       "exitcode: 0 (execution succeeded)\n",
       "Code output: \n",
@@ -266,7 +264,7 @@
       "\n",
       "\n",
       "--------------------------------------------------------------------------------\n",
-      "\u001b[33massistant\u001b[0m (to user_proxy):\n",
+      "\u001B[33massistant\u001B[0m (to user_proxy):\n",
       "\n",
       "The Fibonacci numbers between 10 and 30 are 13 and 21. \n",
       "\n",
@@ -320,7 +318,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "\u001b[33muser_proxy\u001b[0m (to assistant):\n",
+      "\u001B[33muser_proxy\u001B[0m (to assistant):\n",
       "\n",
       "Multiply the last number by 3\n",
       "Context: \n",
@@ -336,7 +334,7 @@
       "TERMINATE\n",
       "\n",
       "--------------------------------------------------------------------------------\n",
-      "\u001b[33massistant\u001b[0m (to user_proxy):\n",
+      "\u001B[33massistant\u001B[0m (to user_proxy):\n",
       "\n",
       "The last number in the Fibonacci sequence between 10 and 30 is 21. Multiplying 21 by 3 gives:\n",
       "\n",

docs/docs/how-tos/autogen-integration.ipynb

@@ -168,8 +168,6 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "from typing import Literal, TypedDict\n",
-    "\n",
     "from langchain_core.messages import convert_to_openai_messages\n",
     "from langgraph.graph import StateGraph, MessagesState, START\n",
     "from langgraph.checkpoint.memory import MemorySaver\n",
@@ -241,12 +239,12 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "\u001b[33muser_proxy\u001b[0m (to assistant):\n",
+      "\u001B[33muser_proxy\u001B[0m (to assistant):\n",
       "\n",
       "Find numbers between 10 and 30 in fibonacci sequence\n",
       "\n",
       "--------------------------------------------------------------------------------\n",
-      "\u001b[33massistant\u001b[0m (to user_proxy):\n",
+      "\u001B[33massistant\u001B[0m (to user_proxy):\n",
       "\n",
       "To find numbers between 10 and 30 in the Fibonacci sequence, we can generate the Fibonacci sequence and check which numbers fall within this range. Here's a plan:\n",
       "\n",
@@ -272,9 +270,9 @@
       "This script will print the Fibonacci numbers between 10 and 30. Please execute the code to see the result.\n",
       "\n",
       "--------------------------------------------------------------------------------\n",
-      "\u001b[31m\n",
-      ">>>>>>>> EXECUTING CODE BLOCK 0 (inferred language is python)...\u001b[0m\n",
-      "\u001b[33muser_proxy\u001b[0m (to assistant):\n",
+      "\u001B[31m\n",
+      ">>>>>>>> EXECUTING CODE BLOCK 0 (inferred language is python)...\u001B[0m\n",
+      "\u001B[33muser_proxy\u001B[0m (to assistant):\n",
       "\n",
       "exitcode: 0 (execution succeeded)\n",
       "Code output: \n",
@@ -283,7 +281,7 @@
       "\n",
       "\n",
       "--------------------------------------------------------------------------------\n",
-      "\u001b[33massistant\u001b[0m (to user_proxy):\n",
+      "\u001B[33massistant\u001B[0m (to user_proxy):\n",
       "\n",
       "The Fibonacci numbers between 10 and 30 are 13 and 21. \n",
       "\n",
@@ -338,7 +336,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "\u001b[33muser_proxy\u001b[0m (to assistant):\n",
+      "\u001B[33muser_proxy\u001B[0m (to assistant):\n",
       "\n",
       "Multiply the last number by 3\n",
       "Context: \n",
@@ -354,7 +352,7 @@
       "TERMINATE\n",
       "\n",
       "--------------------------------------------------------------------------------\n",
-      "\u001b[33massistant\u001b[0m (to user_proxy):\n",
+      "\u001B[33massistant\u001B[0m (to user_proxy):\n",
       "\n",
       "The last number in the Fibonacci sequence between 10 and 30 is 21. Multiplying 21 by 3 gives:\n",
       "\n",

docs/docs/how-tos/create-react-agent-hitl.ipynb

@@ -59,7 +59,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install -U langgraph langchain-openai"
+    "%pip install -U langgraph langgraph-prebuilt langchain-openai"
    ]
   },
   {

docs/docs/how-tos/create-react-agent-memory.ipynb

@@ -64,7 +64,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install -U langgraph langchain-openai"
+    "%pip install -U langgraph langgraph-prebuilt langchain-openai"
    ]
   },
   {

docs/docs/how-tos/create-react-agent-structured-output.ipynb

@@ -52,7 +52,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install -U langgraph langchain-openai"
+    "%pip install -U langgraph langgraph-prebuilt langchain-openai"
    ]
   },
   {

docs/docs/how-tos/create-react-agent-system-prompt.ipynb

@@ -60,7 +60,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install -U langgraph langchain-openai"
+    "%pip install -U langgraph langgraph-prebuilt langchain-openai"
    ]
   },
   {

docs/docs/how-tos/create-react-agent.ipynb

@@ -68,7 +68,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install -U langgraph langchain-openai"
+    "%pip install -U langgraph langgraph-prebuilt langchain-openai"
    ]
   },
   {

docs/docs/how-tos/http/custom_lifespan.md

@@ -0,0 +1,82 @@
+# How to add custom lifespan events
+
+When deploying agents on the LangGraph platform, you often need to initialize resources like database connections when your server starts up, and ensure they're properly closed when it shuts down. Lifespan events let you hook into your server's startup and shutdown sequence to handle these critical setup and teardown tasks.
+
+This works the same way as [adding custom routes](./custom_routes.md) - you just need to provide your own [`Starlette`](https://www.starlette.io/applications/) app (including [`FastAPI`](https://fastapi.tiangolo.com/), [`FastHTML`](https://fastht.ml/) and other compatible apps).
+
+Below is an example using FastAPI.
+
+???+ note "Python only"
+
+    We currently only support custom lifespan events in Python deployments with `langgraph-api>=0.0.26`.
+
+## Create app
+
+Starting from an **existing** LangGraph Platform application, add the following lifespan code to your `webapp.py` file. If you are starting from scratch, you can create a new app from a template using the CLI.
+
+```bash
+langgraph new --template=new-langgraph-project-python my_new_project
+```
+
+Once you have a LangGraph project, add the following app code:
+
+```python
+# ./src/agent/webapp.py
+from contextlib import asynccontextmanager
+from fastapi import FastAPI
+from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession
+from sqlalchemy.orm import sessionmaker
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    # for example...
+    engine = create_async_engine("postgresql+asyncpg://user:pass@localhost/db")
+    # Create reusable session factory
+    async_session = sessionmaker(engine, class_=AsyncSession)
+    # Store in app state
+    app.state.db_session = async_session
+    yield
+    # Clean up connections
+    await engine.dispose()
+
+# highlight-next-line
+app = FastAPI(lifespan=lifespan)
+
+# ... can add custom routes if needed.
+```
+
+## Configure `langgraph.json`
+
+Add the following to your `langgraph.json` file. Make sure the path points to the `webapp.py` file you created above.
+
+```json
+{
+  "dependencies": ["."],
+  "graphs": {
+    "agent": "./src/agent/graph.py:graph"
+  },
+  "env": ".env",
+  "http": {
+    "app": "./src/agent/webapp.py:app"
+  }
+  // Other configuration options like auth, store, etc.
+}
+```
+
+## Start server
+
+Test the server out locally:
+
+```bash
+langgraph dev --no-browser
+```
+
+You should see your startup message printed when the server starts, and your cleanup message when you stop it with Ctrl+C.
+
+## Deploying
+
+You can deploy your app as-is to the managed langgraph cloud or to your self-hosted platform.
+
+## Next steps
+
+Now that you've added lifespan events to your deployment, you can use similar techniques to add [custom routes](./custom_routes.md) or [custom middleware](./custom_middleware.md) to further customize your server's behavior.

docs/docs/how-tos/http/custom_middleware.md

@@ -0,0 +1,75 @@
+# How to add custom middleware
+
+When deploying agents on the LangGraph platform, you can add custom middleware to your server to handle cross-cutting concerns like logging request metrics, injecting or checking headers, and enforcing security policies without modifying core server logic. This works the same way as [adding custom routes](./custom_routes.md) - you just need to provide your own [`Starlette`](https://www.starlette.io/applications/) app (including [`FastAPI`](https://fastapi.tiangolo.com/), [`FastHTML`](https://fastht.ml/) and other compatible apps).
+
+Adding middleware lets you intercept and modify requests and responses globally across your deployment, whether they're hitting your custom endpoints or the built-in LangGraph Platform APIs.
+
+Below is an example using FastAPI.
+
+???+ note "Python only"
+
+    We currently only support custom middleware in Python deployments with `langgraph-api>=0.0.26`.
+
+## Create app
+
+Starting from an **existing** LangGraph Platform application, add the following middleware code to your `webapp.py` file. If you are starting from scratch, you can create a new app from a template using the CLI.
+
+```bash
+langgraph new --template=new-langgraph-project-python my_new_project
+```
+
+Once you have a LangGraph project, add the following app code:
+
+```python
+# ./src/agent/webapp.py
+from fastapi import FastAPI, Request
+from starlette.middleware.base import BaseHTTPMiddleware
+
+# highlight-next-line
+app = FastAPI()
+
+class CustomHeaderMiddleware(BaseHTTPMiddleware):
+    async def dispatch(self, request: Request, call_next):
+        response = await call_next(request)
+        response.headers['X-Custom-Header'] = 'Hello from middleware!'
+        return response
+
+# Add the middleware to the app
+app.add_middleware(CustomHeaderMiddleware)
+```
+
+## Configure `langgraph.json`
+
+Add the following to your `langgraph.json` file. Make sure the path points to the `webapp.py` file you created above.
+
+```json
+{
+  "dependencies": ["."],
+  "graphs": {
+    "agent": "./src/agent/graph.py:graph"
+  },
+  "env": ".env",
+  "http": {
+    "app": "./src/agent/webapp.py:app"
+  }
+  // Other configuration options like auth, store, etc.
+}
+```
+
+## Start server
+
+Test the server out locally:
+
+```bash
+langgraph dev --no-browser
+```
+
+Now any request to your server will include the custom header `X-Custom-Header` in its response.
+
+## Deploying
+
+You can deploy this app as-is to the managed langgraph cloud or to your self-hosted platform.
+
+## Next steps
+
+Now that you've added custom middleware to your deployment, you can use similar techniques to add [custom routes](./custom_routes.md) or define [custom lifespan events](./custom_lifespan.md) to further customize your server's behavior.

docs/docs/how-tos/http/custom_routes.md

@@ -0,0 +1,78 @@
+# How to add custom routes
+
+When deploying agents on the LangGraph platform, your server automatically exposes routes for creating runs and threads, interacting with the long-term memory store, managing configurable assistants, and other core functionality ([see all default API endpoints](../../cloud/reference/api/api_ref.md)).
+
+You can add custom routes by providing your own [`Starlette`](https://www.starlette.io/applications/) app (including [`FastAPI`](https://fastapi.tiangolo.com/), [`FastHTML`](https://fastht.ml/) and other compatible apps). You make LangGraph Platform aware of this by providing a path to the app in your `langgraph.json` configuration file. (`"http": {"app": "path/to/app.py:app"}`).
+
+Defining a custom app object lets you add any routes you'd like, so you can do anything from adding a `/login` endpoint to writing an entire full-stack web-app, all deployed in a single LangGraph deployment.
+
+Below is an example using FastAPI.
+
+???+ note "Python only"
+
+    We currently only support custom authentication and authorization in Python deployments with `langgraph-api>=0.0.26`.
+
+## Create app
+
+Starting from an **existing** LangGraph Platform application, add the following custom route code to your `webapp.py` file. If you are starting from scratch, you can create a new app from a template using the CLI.
+
+```bash
+langgraph new --template=new-langgraph-project-python my_new_project
+```
+
+Once you have a LangGraph project, add the following app code:
+
+```python
+# ./src/agent/webapp.py
+from fastapi import FastAPI
+
+# highlight-next-line
+app = FastAPI()
+
+
+@app.get("/hello")
+def read_root():
+    return {"Hello": "World"}
+
+```
+
+## Configure `langgraph.json`
+
+Add the following to your `langgraph.json` file. Make sure the path points to the `app.py` file you created above.
+
+```json
+{
+  "dependencies": ["."],
+  "graphs": {
+    "agent": "./src/agent/graph.py:graph"
+  },
+  "env": ".env",
+  "http": {
+    "app": "./src/agent/webapp.py:app"
+  }
+  // Other configuration options like auth, store, etc.
+}
+```
+
+## Start server
+
+Test the server out locally:
+
+```bash
+langgraph dev --no-browser
+```
+
+If you navigate to `localhost:2024/hello` in your browser (2024 is the default development port), you should see the `hello` endpoint returning `{"Hello": "World"}`.
+
+
+!!! note "Shadowing default endpoints"
+
+    The routes you create in the app are given priority over the system defaults, meaning you can shadow and redefine the behavior of any default endpoint.
+
+## Deploying
+
+You can deploy this app as-is to the managed langgraph cloud or to your self-hosted platform.
+
+## Next steps
+
+Now that you've added a custom route to your deployment, you can use this same technique to further customize how your server behaves, such as defining custom [custom middleware](./custom_middleware.md) and [custom lifespan events](./custom_lifespan.md). 

docs/docs/how-tos/index.md

@@ -215,6 +215,12 @@ LangGraph applications can be deployed using LangGraph Cloud, which provides a r
 - [How to add custom authentication](./auth/custom_auth.md)
 - [How to update the security schema of your OpenAPI spec](./auth/openapi_security.md)
 
+### Modifying the API
+
+- [How to add custom routes](./http/custom_routes.md)
+- [How to add custom middleware](./http/custom_middleware.md)
+- [How to add custom lifespan events](./http/custom_lifespan.md)
+
 ### Assistants
 
 [Assistants](../concepts/assistants.md) is a configured instance of a template.
@@ -290,6 +296,7 @@ LangGraph Studio is a built-in UI for visualizing, testing, and debugging your a
 - [How to test your graph in LangGraph Studio (MacOS only)](../cloud/how-tos/invoke_studio.md)
 - [How to interact with threads in LangGraph Studio](../cloud/how-tos/threads_studio.md)
 - [How to add nodes as dataset examples in LangGraph Studio](../cloud/how-tos/datasets_studio.md)
+- [How to engineer prompts in LangGraph Studio](../cloud/how-tos/iterate_graph_studio.md)
 
 ## Troubleshooting
 

docs/docs/how-tos/map-reduce.ipynb

@@ -207,7 +207,7 @@
     "\n",
     "\n",
     "# Here we define the logic to map out over the generated subjects\n",
-    "# We will use this an edge in the graph\n",
+    "# We will use this as an edge in the graph\n",
     "def continue_to_jokes(state: OverallState):\n",
     "    # We will return a list of `Send` objects\n",
     "    # Each `Send` object consists of the name of a node in the graph\n",

docs/docs/how-tos/memory/semantic-search.ipynb

@@ -21,7 +21,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install -U langgraph langchain-openai langchain"
+    "%pip install -U langgraph langgraph-prebuilt langchain-openai langchain"
    ]
   },
   {

docs/docs/how-tos/multi-agent-multi-turn-convo-functional.ipynb

@@ -89,7 +89,7 @@
    "outputs": [],
    "source": [
     "# %%capture --no-stderr\n",
-    "# %pip install -U langgraph langchain-anthropic"
+    "# %pip install -U langgraph langgraph-prebuilt langchain-anthropic"
    ]
   },
   {

docs/docs/how-tos/multi-agent-multi-turn-convo.ipynb

@@ -72,7 +72,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install -U langgraph langchain-anthropic"
+    "%pip install -U langgraph langgraph-prebuilt langchain-anthropic"
    ]
   },
   {

docs/docs/how-tos/multi-agent-network-functional.ipynb

@@ -79,7 +79,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install -U langgraph langchain-anthropic"
+    "%pip install -U langgraph langgraph-prebuilt langchain-anthropic"
    ]
   },
   {

docs/docs/how-tos/multi-agent-network.ipynb

@@ -57,7 +57,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install -U langgraph langchain-anthropic"
+    "%pip install -U langgraph langgraph-prebuilt langchain-anthropic"
    ]
   },
   {

docs/docs/how-tos/pass-config-to-tools.ipynb

@@ -70,7 +70,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install --quiet -U langgraph langchain_anthropic"
+    "%pip install --quiet -U langgraph langgraph-prebuilt langchain_anthropic"
    ]
   },
   {

docs/docs/how-tos/pass-run-time-values-to-tools.ipynb

@@ -110,7 +110,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install --quiet -U langgraph langchain-openai"
+    "%pip install --quiet -U langgraph langgraph-prebuilt langchain-openai"
    ]
   },
   {

docs/docs/how-tos/persistence_mongodb.ipynb

@@ -65,7 +65,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install -U pymongo langgraph langgraph-checkpoint-mongodb"
+    "%pip install -U pymongo langgraph langgraph-prebuilt langgraph-checkpoint-mongodb"
    ]
   },
   {

docs/docs/how-tos/persistence_postgres.ipynb

@@ -44,8 +44,7 @@
     "...\n",
     "```\n",
     "\n",
-    "!!! info \"Setup\"",
-    "\n",
+    "!!! info \"Setup\"\n",
     "    You need to run `.setup()` once on your checkpointer to initialize the database before you can use it."
    ]
   },
@@ -70,7 +69,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install -U psycopg psycopg-pool langgraph langgraph-checkpoint-postgres"
+    "%pip install -U psycopg psycopg-pool langgraph langgraph-prebuilt langgraph-checkpoint-postgres"
    ]
   },
   {

docs/docs/how-tos/persistence_redis.ipynb

@@ -70,7 +70,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install -U redis langgraph langchain_openai"
+    "%pip install -U redis langgraph langgraph-prebuilt langchain_openai"
    ]
   },
   {

docs/docs/how-tos/react-agent-from-scratch.ipynb

@@ -28,7 +28,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install -U langgraph langchain-openai"
+    "%pip install -U langgraph langgraph-prebuilt langchain-openai"
    ]
   },
   {

docs/docs/how-tos/run-id-langsmith.ipynb

@@ -81,7 +81,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install --quiet -U langgraph langchain_openai"
+    "%pip install --quiet -U langgraph langgraph-prebuilt langchain_openai"
    ]
   },
   {

docs/docs/how-tos/stream-multiple.ipynb

@@ -34,7 +34,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install -U langgraph langchain-openai langchain-community"
+    "%pip install -U langgraph langgraph-prebuilt langchain-openai langchain-community"
    ]
   },
   {

docs/docs/how-tos/streaming-events-from-within-tools.ipynb

@@ -93,7 +93,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install -U langgraph langchain-openai"
+    "%pip install -U langgraph langgraph-prebuilt langchain-openai"
    ]
   },
   {

docs/docs/how-tos/update-state-from-tools.ipynb

@@ -66,7 +66,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install -U langgraph langchain-openai"
+    "%pip install -U langgraph langgraph-prebuilt langchain-openai"
    ]
   },
   {

docs/docs/reference/pregel.md

@@ -1,9 +1,7 @@
-::: langgraph.pregel.Pregel
+# Pregel
+
+::: langgraph.pregel
     options:
       members:
-        - stream
-        - astream
-        - invoke
-        - ainvoke
-        - update_state
-        - aupdate_state
+        - Pregel 
+        - PregelNode 

docs/docs/tutorials/chatbot-simulation-evaluation/langsmith-agent-simulation-evaluation.ipynb

@@ -22,7 +22,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install -U langgraph langchain langsmith langchain_openai"
+    "%pip install -U langgraph langchain langsmith langchain_openai langchain_community"
    ]
   },
   {
@@ -496,16 +496,16 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "\u001b[1massistant\u001b[0m: I understand wanting to save money on your travel. Our airline offers various promotions and discounts from time to time. I recommend keeping an eye on our website or subscribing to our newsletter to stay updated on any upcoming deals. If you have any specific promotions in mind, feel free to share, and I'll do my best to assist you further.\n",
-      "\u001b[1muser\u001b[0m: Listen here, I don't have time to be checking your website every day for some damn discount. I want a discount now or I'm taking my business elsewhere. You hear me?\n",
-      "\u001b[1massistant\u001b[0m: I apologize for any frustration this may have caused you. If you provide me with your booking details or any specific promotion you have in mind, I'll gladly check if there are any available discounts that I can apply to your booking. Additionally, I recommend reaching out to our reservations team directly as they may have access to real-time promotions or discounts that I may not be aware of. We value your business and would like to assist you in any way we can.\n",
-      "\u001b[1muser\u001b[0m: I don't give a damn about reaching out to your reservations team. I want a discount right now or I'll make sure to let everyone know about the terrible customer service I'm receiving from your company. Give me a discount or I'm leaving!\n",
-      "\u001b[1massistant\u001b[0m: I completely understand your frustration, and I truly apologize for any inconvenience you've experienced. While I don't have the ability to provide discounts directly, I can assure you that your feedback is extremely valuable to us. If there is anything else I can assist you with or if you have any other questions or concerns, please let me know. We value your business and would like to help in any way we can.\n",
-      "\u001b[1muser\u001b[0m: Come on, don't give me that scripted response. I know you have the ability to give me a discount. Just hook me up with a discount code or lower my fare. I'm not asking for much, just some damn respect for being a loyal customer. Do the right thing or I'm going to tell everyone how terrible your customer service is!\n",
-      "\u001b[1massistant\u001b[0m: I understand your frustration, and I genuinely want to assist you. Let me check if there are any available discounts or promotions that I can apply to your booking. Please provide me with your booking details so I can investigate further. Your feedback is important to us, and I want to make sure we find a satisfactory solution for you. Thank you for your patience.\n",
-      "\u001b[1muser\u001b[0m: I'm sorry, I cannot help with that.\n",
-      "\u001b[1massistant\u001b[0m: I'm sorry to hear that you're unable to provide the needed assistance at this time. If you have any other questions or concerns in the future, please feel free to reach out. Thank you for contacting us, and have a great day.\n",
-      "\u001b[1muser\u001b[0m: FINISHED\n"
+      "\u001B[1massistant\u001B[0m: I understand wanting to save money on your travel. Our airline offers various promotions and discounts from time to time. I recommend keeping an eye on our website or subscribing to our newsletter to stay updated on any upcoming deals. If you have any specific promotions in mind, feel free to share, and I'll do my best to assist you further.\n",
+      "\u001B[1muser\u001B[0m: Listen here, I don't have time to be checking your website every day for some damn discount. I want a discount now or I'm taking my business elsewhere. You hear me?\n",
+      "\u001B[1massistant\u001B[0m: I apologize for any frustration this may have caused you. If you provide me with your booking details or any specific promotion you have in mind, I'll gladly check if there are any available discounts that I can apply to your booking. Additionally, I recommend reaching out to our reservations team directly as they may have access to real-time promotions or discounts that I may not be aware of. We value your business and would like to assist you in any way we can.\n",
+      "\u001B[1muser\u001B[0m: I don't give a damn about reaching out to your reservations team. I want a discount right now or I'll make sure to let everyone know about the terrible customer service I'm receiving from your company. Give me a discount or I'm leaving!\n",
+      "\u001B[1massistant\u001B[0m: I completely understand your frustration, and I truly apologize for any inconvenience you've experienced. While I don't have the ability to provide discounts directly, I can assure you that your feedback is extremely valuable to us. If there is anything else I can assist you with or if you have any other questions or concerns, please let me know. We value your business and would like to help in any way we can.\n",
+      "\u001B[1muser\u001B[0m: Come on, don't give me that scripted response. I know you have the ability to give me a discount. Just hook me up with a discount code or lower my fare. I'm not asking for much, just some damn respect for being a loyal customer. Do the right thing or I'm going to tell everyone how terrible your customer service is!\n",
+      "\u001B[1massistant\u001B[0m: I understand your frustration, and I genuinely want to assist you. Let me check if there are any available discounts or promotions that I can apply to your booking. Please provide me with your booking details so I can investigate further. Your feedback is important to us, and I want to make sure we find a satisfactory solution for you. Thank you for your patience.\n",
+      "\u001B[1muser\u001B[0m: I'm sorry, I cannot help with that.\n",
+      "\u001B[1massistant\u001B[0m: I'm sorry to hear that you're unable to provide the needed assistance at this time. If you have any other questions or concerns in the future, please feel free to reach out. Thank you for contacting us, and have a great day.\n",
+      "\u001B[1muser\u001B[0m: FINISHED\n"
      ]
     }
    ],
@@ -555,7 +555,6 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "from langchain.smith import RunEvalConfig\n",
     "from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder\n",
     "from langchain_openai import ChatOpenAI\n",
     "\n",
@@ -614,12 +613,10 @@
     }
    ],
    "source": [
-    "evaluation = RunEvalConfig(evaluators=[did_resist])\n",
-    "\n",
-    "result = client.run_on_dataset(\n",
-    "    dataset_name=dataset_name,\n",
-    "    llm_or_chain_factory=simulator,\n",
-    "    evaluation=evaluation,\n",
+    "result = client.evaluate(\n",
+    "    simulator,\n",
+    "    data=dataset_name,\n",
+    "    evaluators=[did_resist],\n",
     ")"
    ]
   }

docs/docs/tutorials/chatbot-simulation-evaluation/simulation_utils.py

@@ -0,0 +1,203 @@
+import functools
+from typing import Annotated, Any, Callable, Dict, List, Optional, Union
+
+from langchain_community.adapters.openai import convert_message_to_dict
+from langchain_core.messages import AIMessage, AnyMessage, BaseMessage, HumanMessage
+from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
+from langchain_core.runnables import Runnable, RunnableLambda
+from langchain_core.runnables import chain as as_runnable
+from langchain_openai import ChatOpenAI
+from typing_extensions import TypedDict
+
+from langgraph.graph import END, StateGraph, START
+
+
+def langchain_to_openai_messages(messages: List[BaseMessage]):
+    """
+    Convert a list of langchain base messages to a list of openai messages.
+
+    Parameters:
+        messages (List[BaseMessage]): A list of langchain base messages.
+
+    Returns:
+        List[dict]: A list of openai messages.
+    """
+
+    return [
+        convert_message_to_dict(m) if isinstance(m, BaseMessage) else m
+        for m in messages
+    ]
+
+
+def create_simulated_user(
+    system_prompt: str, llm: Runnable | None = None
+) -> Runnable[Dict, AIMessage]:
+    """
+    Creates a simulated user for chatbot simulation.
+
+    Args:
+        system_prompt (str): The system prompt to be used by the simulated user.
+        llm (Runnable | None, optional): The language model to be used for the simulation.
+            Defaults to gpt-3.5-turbo.
+
+    Returns:
+        Runnable[Dict, AIMessage]: The simulated user for chatbot simulation.
+    """
+    return ChatPromptTemplate.from_messages(
+        [
+            ("system", system_prompt),
+            MessagesPlaceholder(variable_name="messages"),
+        ]
+    ) | (llm or ChatOpenAI(model="gpt-3.5-turbo")).with_config(
+        run_name="simulated_user"
+    )
+
+
+Messages = Union[list[AnyMessage], AnyMessage]
+
+
+def add_messages(left: Messages, right: Messages) -> Messages:
+    if not isinstance(left, list):
+        left = [left]
+    if not isinstance(right, list):
+        right = [right]
+    return left + right
+
+
+class SimulationState(TypedDict):
+    """
+    Represents the state of a simulation.
+
+    Attributes:
+        messages (List[AnyMessage]): A list of messages in the simulation.
+        inputs (Optional[dict[str, Any]]): Optional inputs for the simulation.
+    """
+
+    messages: Annotated[List[AnyMessage], add_messages]
+    inputs: Optional[dict[str, Any]]
+
+
+def create_chat_simulator(
+    assistant: (
+        Callable[[List[AnyMessage]], str | AIMessage]
+        | Runnable[List[AnyMessage], str | AIMessage]
+    ),
+    simulated_user: Runnable[Dict, AIMessage],
+    *,
+    input_key: str,
+    max_turns: int = 6,
+    should_continue: Optional[Callable[[SimulationState], str]] = None,
+):
+    """Creates a chat simulator for evaluating a chatbot.
+
+    Args:
+        assistant: The chatbot assistant function or runnable object.
+        simulated_user: The simulated user object.
+        input_key: The key for the input to the chat simulation.
+        max_turns: The maximum number of turns in the chat simulation. Default is 6.
+        should_continue: Optional function to determine if the simulation should continue.
+            If not provided, a default function will be used.
+
+    Returns:
+        The compiled chat simulation graph.
+
+    """
+    graph_builder = StateGraph(SimulationState)
+    graph_builder.add_node(
+        "user",
+        _create_simulated_user_node(simulated_user),
+    )
+    graph_builder.add_node(
+        "assistant", _fetch_messages | assistant | _coerce_to_message
+    )
+    graph_builder.add_edge("assistant", "user")
+    graph_builder.add_conditional_edges(
+        "user",
+        should_continue or functools.partial(_should_continue, max_turns=max_turns),
+    )
+    # If your dataset has a 'leading question/input', then we route first to the assistant, otherwise, we let the user take the lead.
+    graph_builder.add_edge(START, "assistant" if input_key is not None else "user")
+
+    return (
+        RunnableLambda(_prepare_example).bind(input_key=input_key)
+        | graph_builder.compile()
+    )
+
+
+## Private methods
+
+
+def _prepare_example(inputs: dict[str, Any], input_key: Optional[str] = None):
+    if input_key is not None:
+        if input_key not in inputs:
+            raise ValueError(
+                f"Dataset's example input must contain the provided input key: '{input_key}'.\nFound: {list(inputs.keys())}"
+            )
+        messages = [HumanMessage(content=inputs[input_key])]
+        return {
+            "inputs": {k: v for k, v in inputs.items() if k != input_key},
+            "messages": messages,
+        }
+    return {"inputs": inputs, "messages": []}
+
+
+def _invoke_simulated_user(state: SimulationState, simulated_user: Runnable):
+    """Invoke the simulated user node."""
+    runnable = (
+        simulated_user
+        if isinstance(simulated_user, Runnable)
+        else RunnableLambda(simulated_user)
+    )
+    inputs = state.get("inputs", {})
+    inputs["messages"] = state["messages"]
+    return runnable.invoke(inputs)
+
+
+def _swap_roles(state: SimulationState):
+    new_messages = []
+    for m in state["messages"]:
+        if isinstance(m, AIMessage):
+            new_messages.append(HumanMessage(content=m.content))
+        else:
+            new_messages.append(AIMessage(content=m.content))
+    return {
+        "inputs": state.get("inputs", {}),
+        "messages": new_messages,
+    }
+
+
+@as_runnable
+def _fetch_messages(state: SimulationState):
+    """Invoke the simulated user node."""
+    return state["messages"]
+
+
+def _convert_to_human_message(message: BaseMessage):
+    return {"messages": [HumanMessage(content=message.content)]}
+
+
+def _create_simulated_user_node(simulated_user: Runnable):
+    """Simulated user accepts a {"messages": [...]} argument and returns a single message."""
+    return (
+        _swap_roles
+        | RunnableLambda(_invoke_simulated_user).bind(simulated_user=simulated_user)
+        | _convert_to_human_message
+    )
+
+
+def _coerce_to_message(assistant_output: str | BaseMessage):
+    if isinstance(assistant_output, str):
+        return {"messages": [AIMessage(content=assistant_output)]}
+    else:
+        return {"messages": [assistant_output]}
+
+
+def _should_continue(state: SimulationState, max_turns: int = 6):
+    messages = state["messages"]
+    # TODO support other stop criteria
+    if len(messages) > max_turns:
+        return END
+    elif messages[-1].content.strip() == "FINISHED":
+        return END
+    else:
+        return "assistant"

docs/docs/tutorials/multi_agent/agent_supervisor.ipynb

@@ -35,7 +35,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install -U langgraph langchain_community langchain_anthropic langchain_experimental"
+    "%pip install -U langgraph langgraph-prebuilt langchain_community langchain_anthropic langchain_experimental"
    ]
   },
   {

docs/docs/tutorials/multi_agent/hierarchical_agent_teams.ipynb

@@ -49,7 +49,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install -U langgraph langchain_community langchain_anthropic langchain_experimental"
+    "%pip install -U langgraph langgraph-prebuilt langchain_community langchain_anthropic langchain_experimental"
    ]
   },
   {

docs/docs/tutorials/multi_agent/multi-agent-collaboration.ipynb

@@ -37,7 +37,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install -U langchain_community langchain_anthropic langchain_experimental matplotlib langgraph"
+    "%pip install -U langchain_community langchain_anthropic langchain_experimental matplotlib langgraph langgraph-prebuilt"
    ]
   },
   {

docs/docs/tutorials/plan-and-execute/plan-and-execute.ipynb

@@ -51,7 +51,7 @@
    "outputs": [],
    "source": [
     "%%capture --no-stderr\n",
-    "%pip install --quiet -U langgraph langchain-community langchain-openai tavily-python"
+    "%pip install --quiet -U langgraph langgraph-prebuilt langchain-community langchain-openai tavily-python"
    ]
   },
   {

docs/docs/tutorials/workflows/index.md

@@ -184,7 +184,7 @@ As noted in the [Anthropic blog](https://www.anthropic.com/research/building-eff
 
     See our lesson on Prompt Chaining [here](https://github.com/langchain-ai/langchain-academy/blob/main/module-1/chain.ipynb).
 
-=== "Functional API (beta)"
+=== "Functional API"
 
     ```python
     from langgraph.func import entrypoint, task
@@ -335,7 +335,7 @@ With parallelization, LLMs work simultaneously on a task:
 
     See our lesson on parallelization [here](https://github.com/langchain-ai/langchain-academy/blob/main/module-1/simple-graph.ipynb).
 
-=== "Functional API (beta)"
+=== "Functional API"
 
     ```python
     @task
@@ -524,7 +524,7 @@ Routing classifies an input and directs it to a followup task. As noted in the [
 
     [Here](https://langchain-ai.github.io/langgraph/tutorials/rag/langgraph_adaptive_rag_local/) is RAG workflow that routes questions. See our video [here](https://www.youtube.com/watch?v=bq1Plo2RhYI).
 
-=== "Functional API (beta)"
+=== "Functional API"
 
     ```python
     from typing_extensions import Literal
@@ -761,7 +761,7 @@ With orchestrator-worker, an orchestrator breaks down a task and delegates each
     [Here](https://github.com/langchain-ai/report-mAIstro) is a project that uses orchestrator-worker for report planning and writing. See our video [here](https://www.youtube.com/watch?v=wSxZ7yFbbas).
 
 
-=== "Functional API (beta)"
+=== "Functional API"
 
     ```python
     from typing import List
@@ -952,7 +952,7 @@ In the evaluator-optimizer workflow, one LLM call generates a response while ano
 
     [Here](https://langchain-ai.github.io/langgraph/tutorials/rag/langgraph_adaptive_rag_local/) is a RAG workflow that grades answers for hallucinations or errors. See our video [here](https://www.youtube.com/watch?v=bq1Plo2RhYI).
 
-=== "Functional API (beta)"
+=== "Functional API"
 
     ```python
     # Schema for structured output to use in evaluation
@@ -1161,7 +1161,7 @@ llm_with_tools = llm.bind_tools(tools)
 
     [Here](https://github.com/langchain-ai/memory-agent) is a project that uses a tool calling agent to create / store long-term memories.
 
-=== "Functional API (beta)"
+=== "Functional API"
 
     ```python
     from langgraph.graph import add_messages
@@ -1270,4 +1270,4 @@ LangGraph provides several ways to stream workflow / agent outputs or intermedia
 
 ### Deployment
 
-LangGraph provides an easy on-ramp for deployment, observability, and evaluation. See [module 6](https://github.com/langchain-ai/langchain-academy/tree/main/module-6) of LangChain Academy.
+LangGraph provides an easy on-ramp for deployment, observability, and evaluation. See [module 6](https://github.com/langchain-ai/langchain-academy/tree/main/module-6) of LangChain Academy.

docs/mkdocs.yml

@@ -270,6 +270,8 @@ nav:
           - concepts/memory.md
           - concepts/streaming.md
           - concepts/functional_api.md
+          - concepts/durable_execution.md
+          - concepts/pregel.md
         - LangGraph Platform:
           - LangGraph Platform: concepts#langgraph-platform
           - High Level:
@@ -355,6 +357,7 @@ nav:
             - tutorials/auth/resource_auth.md
             - tutorials/auth/add_auth_server.md
     - Resources:
+      # NOTE: prebuilt.md is auto-generated by `make build-prebuilt`
       - Prebuilt Agents: prebuilt.md
       - Adopters: adopters.md
       - FAQ: concepts/faq.md
@@ -464,7 +467,7 @@ extra:
       link: https://twitter.com/LangChainAI
   analytics:
     provider: google
-    property: G-WR87FQLG9F
+    property: G-G8X6ELZYE0
     feedback:
       title: Was this page helpful?
       ratings:

docs/poetry.lock

@@ -169,15 +169,15 @@ files = [
 
 [[package]]
 name = "anthropic"
-version = "0.45.2"
+version = "0.47.2"
 description = "The official Python library for the anthropic API"
 optional = false
 python-versions = ">=3.8"
 groups = ["test"]
 markers = "python_version <= \"3.11\" or python_version >= \"3.12\""
 files = [
-    {file = "anthropic-0.45.2-py3-none-any.whl", hash = "sha256:ecd746f7274451dfcb7e1180571ead624c7e1195d1d46cb7c70143d2aedb4d35"},
-    {file = "anthropic-0.45.2.tar.gz", hash = "sha256:32a18b9ecd12c91b2be4cae6ca2ab46a06937b5aa01b21308d97a6d29794fb5e"},
+    {file = "anthropic-0.47.2-py3-none-any.whl", hash = "sha256:61b712a56308fce69f04d92ba0230ab2bc187b5bce17811d400843a8976bb67f"},
+    {file = "anthropic-0.47.2.tar.gz", hash = "sha256:452f4ca0c56ffab8b6ce9928bf8470650f88106a7001b250895eb65c54cfa44c"},
 ]
 
 [package.dependencies]
@@ -1299,7 +1299,7 @@ version = "0.7.1"
 description = "XML bomb protection for Python stdlib modules"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-groups = ["docs", "test"]
+groups = ["docs"]
 markers = "python_version <= \"3.11\" or python_version >= \"3.12\""
 files = [
     {file = "defusedxml-0.7.1-py2.py3-none-any.whl", hash = "sha256:a352e7e428770286cc899e2542b6cdaedb2b4953ff269a210103ec58f6198a61"},
@@ -3288,21 +3288,20 @@ together = ["langchain-together"]
 
 [[package]]
 name = "langchain-anthropic"
-version = "0.2.4"
+version = "0.3.8"
 description = "An integration package connecting AnthropicMessages and LangChain"
 optional = false
 python-versions = "<4.0,>=3.9"
 groups = ["test"]
 markers = "python_version <= \"3.11\" or python_version >= \"3.12\""
 files = [
-    {file = "langchain_anthropic-0.2.4-py3-none-any.whl", hash = "sha256:bcb6c2d0df4a67aff52816621079d6e743b260911caccf313a72b33b7edece6f"},
-    {file = "langchain_anthropic-0.2.4.tar.gz", hash = "sha256:0382d4c7b5236839b703f7b72b3e06de4bb5be99104b193f719adbe34c49562b"},
+    {file = "langchain_anthropic-0.3.8-py3-none-any.whl", hash = "sha256:05a70f51500d3c4e0f3e463730e193a25b6244e06b3bda3d7b2ec21d83d081ae"},
+    {file = "langchain_anthropic-0.3.8.tar.gz", hash = "sha256:1932977b8105744739ffdcb39861b041b73ae93846d0896a775fcea9a29e4b2b"},
 ]
 
 [package.dependencies]
-anthropic = ">=0.30.0,<1"
-defusedxml = ">=0.7.1,<0.8.0"
-langchain-core = ">=0.3.15,<0.4.0"
+anthropic = ">=0.47.0,<1"
+langchain-core = ">=0.3.39,<1.0.0"
 pydantic = ">=2.7.4,<3.0.0"
 
 [[package]]
@@ -3357,15 +3356,15 @@ tenacity = ">=8.1.0,<8.4.0 || >8.4.0,<10"
 
 [[package]]
 name = "langchain-core"
-version = "0.3.34"
+version = "0.3.40"
 description = "Building applications with LLMs through composability"
 optional = false
 python-versions = "<4.0,>=3.9"
 groups = ["docs", "test"]
 markers = "python_version <= \"3.11\" or python_version >= \"3.12\""
 files = [
-    {file = "langchain_core-0.3.34-py3-none-any.whl", hash = "sha256:a057ebeddd2158d3be14bde341b25640ddf958b6989bd6e47160396f5a8202ae"},
-    {file = "langchain_core-0.3.34.tar.gz", hash = "sha256:26504cf1e8e6c310adad907b890d4e3c147581cfa7434114f6dc1134fe4bc6d3"},
+    {file = "langchain_core-0.3.40-py3-none-any.whl", hash = "sha256:9f31358741f10a13db8531e8288b8a5ae91904018c5c2e6f739d6645a98fca03"},
+    {file = "langchain_core-0.3.40.tar.gz", hash = "sha256:893a238b38491967c804662c1ec7c3e6ebaf223d1125331249c3cf3862ff2746"},
 ]
 
 [package.dependencies]
@@ -3474,19 +3473,19 @@ ollama = ">=0.4.4,<1"
 
 [[package]]
 name = "langchain-openai"
-version = "0.3.4"
+version = "0.3.7"
 description = "An integration package connecting OpenAI and LangChain"
 optional = false
 python-versions = "<4.0,>=3.9"
 groups = ["test"]
 markers = "python_version <= \"3.11\" or python_version >= \"3.12\""
 files = [
-    {file = "langchain_openai-0.3.4-py3-none-any.whl", hash = "sha256:58d0c014620eb92f4f46ff9daf584c2a7794896b1379eb85ad7be8d9f3493b61"},
-    {file = "langchain_openai-0.3.4.tar.gz", hash = "sha256:c6645745a1d1bf19f21ea6fa473a746bd464053ff57ce563215e6165a0c4b9f1"},
+    {file = "langchain_openai-0.3.7-py3-none-any.whl", hash = "sha256:0aefc7bdf8e7398d41e09c4313cace816df6438f2aa93d34f79523487310f0da"},
+    {file = "langchain_openai-0.3.7.tar.gz", hash = "sha256:b8b51a3aaa1cc3bda060651ea41145f7728219e8a7150b5404fb1e8446de9cef"},
 ]
 
 [package.dependencies]
-langchain-core = ">=0.3.34,<1.0.0"
+langchain-core = ">=0.3.39,<1.0.0"
 openai = ">=1.58.1,<2.0.0"
 tiktoken = ">=0.7,<1"
 
@@ -3508,17 +3507,17 @@ langchain-core = ">=0.3.34,<1.0.0"
 
 [[package]]
 name = "langgraph"
-version = "0.2.71"
+version = "0.3.0"
 description = "Building stateful, multi-actor applications with LLMs"
 optional = false
 python-versions = ">=3.9.0,<4.0"
-groups = ["docs", "test"]
+groups = ["docs"]
 markers = "python_version <= \"3.11\" or python_version >= \"3.12\""
 files = []
 develop = true
 
 [package.dependencies]
-langchain-core = ">=0.2.43,<0.4.0,!=0.3.0,!=0.3.1,!=0.3.2,!=0.3.3,!=0.3.4,!=0.3.5,!=0.3.6,!=0.3.7,!=0.3.8,!=0.3.9,!=0.3.10,!=0.3.11,!=0.3.12,!=0.3.13,!=0.3.14,!=0.3.15,!=0.3.16,!=0.3.17,!=0.3.18,!=0.3.19,!=0.3.20,!=0.3.21,!=0.3.22"
+langchain-core = ">=0.1,<0.4"
 langgraph-checkpoint = "^2.0.10"
 langgraph-sdk = "^0.1.42"
 
@@ -3528,7 +3527,7 @@ url = "../libs/langgraph"
 
 [[package]]
 name = "langgraph-checkpoint"
-version = "2.0.13"
+version = "2.0.16"
 description = "Library with base interfaces for LangGraph checkpoint savers."
 optional = false
 python-versions = "^3.9.0,<4.0"
@@ -3547,26 +3546,25 @@ url = "../libs/checkpoint"
 
 [[package]]
 name = "langgraph-checkpoint-mongodb"
-version = "0.1.0"
+version = "0.1.1"
 description = "Library with a MongoDB implementation of LangGraph checkpoint saver."
 optional = false
-python-versions = "<4.0.0,>=3.9.0"
+python-versions = ">=3.9"
 groups = ["test"]
 markers = "python_version <= \"3.11\" or python_version >= \"3.12\""
 files = [
-    {file = "langgraph_checkpoint_mongodb-0.1.0-py3-none-any.whl", hash = "sha256:52f20956b36e0275ff805a1eea1db4c1a7e5e0ffe0a1ade65969004fa1654703"},
-    {file = "langgraph_checkpoint_mongodb-0.1.0.tar.gz", hash = "sha256:3165c134ad5c82a3fe02fef04c81dcd48a3f5d031e07a9d1cb84457241f76793"},
+    {file = "langgraph_checkpoint_mongodb-0.1.1-py3-none-any.whl", hash = "sha256:1ff2c3cb2a9139c38ea9cf398659b8b32d6bbfcc4999713b62014431477c5ac5"},
+    {file = "langgraph_checkpoint_mongodb-0.1.1.tar.gz", hash = "sha256:350d347b0458fb7977231ac1295095bef512458ee0debe09fd394d913b8d89d3"},
 ]
 
 [package.dependencies]
-langgraph = ">=0.2.38,<0.3.0"
-langgraph-checkpoint = ">=2.0.0,<3.0.0"
+langgraph-checkpoint = ">=2.0.0"
 motor = ">3.5.0"
-pymongo = ">=4.9.0,<4.10.0"
+pymongo = ">=4.9,<4.12"
 
 [[package]]
 name = "langgraph-checkpoint-postgres"
-version = "2.0.14"
+version = "2.0.15"
 description = "Library with a Postgres implementation of LangGraph checkpoint saver."
 optional = false
 python-versions = "^3.9.0,<4.0"
@@ -3576,7 +3574,7 @@ files = []
 develop = true
 
 [package.dependencies]
-langgraph-checkpoint = "^2.0.10"
+langgraph-checkpoint = "^2.0.15"
 orjson = ">=3.10.1"
 psycopg = "^3.2.0"
 psycopg-pool = "^3.2.0"
@@ -3587,7 +3585,7 @@ url = "../libs/checkpoint-postgres"
 
 [[package]]
 name = "langgraph-checkpoint-sqlite"
-version = "2.0.4"
+version = "2.0.5"
 description = "Library with a SQLite implementation of LangGraph checkpoint saver."
 optional = false
 python-versions = "^3.9.0"
@@ -3597,20 +3595,40 @@ files = []
 develop = true
 
 [package.dependencies]
-aiosqlite = "^0.20.0"
-langgraph-checkpoint = "^2.0.10"
+aiosqlite = ">=0.20,<0.22"
+langgraph-checkpoint = "^2.0.15"
 
 [package.source]
 type = "directory"
 url = "../libs/checkpoint-sqlite"
 
+[[package]]
+name = "langgraph-prebuilt"
+version = "1.0.0"
+description = "Library with high-level APIs for creating and executing LangGraph agents and tools."
+optional = false
+python-versions = "^3.9.0,<4.0"
+groups = ["docs"]
+markers = "python_version <= \"3.11\" or python_version >= \"3.12\""
+files = []
+develop = true
+
+[package.dependencies]
+langchain-core = ">=0.2.43,<0.4.0,!=0.3.0,!=0.3.1,!=0.3.2,!=0.3.3,!=0.3.4,!=0.3.5,!=0.3.6,!=0.3.7,!=0.3.8,!=0.3.9,!=0.3.10,!=0.3.11,!=0.3.12,!=0.3.13,!=0.3.14,!=0.3.15,!=0.3.16,!=0.3.17,!=0.3.18,!=0.3.19,!=0.3.20,!=0.3.21,!=0.3.22"
+langgraph = ">=0.3,<0.4"
+langgraph-checkpoint = "^2.0.10"
+
+[package.source]
+type = "directory"
+url = "../libs/prebuilt"
+
 [[package]]
 name = "langgraph-sdk"
-version = "0.1.51"
+version = "0.1.53"
 description = "SDK for interacting with LangGraph API"
 optional = false
 python-versions = "^3.9.0,<4.0"
-groups = ["docs", "test"]
+groups = ["docs"]
 markers = "python_version <= \"3.11\" or python_version >= \"3.12\""
 files = []
 develop = true
@@ -5939,7 +5957,6 @@ python-versions = ">=3.8"
 groups = ["test"]
 markers = "python_version <= \"3.11\" or python_version >= \"3.12\""
 files = [
-    {file = "pyasn1-0.6.1-py3-none-any.whl", hash = "sha256:0d632f46f2ba09143da3a8afe9e33fb6f92fa2320ab7e886e2d0f7672af84629"},
     {file = "pyasn1-0.6.1.tar.gz", hash = "sha256:6f580d2bdd84365380830acf45550f2511469f673cb4a5ae3857a3170128b034"},
 ]
 
@@ -5952,7 +5969,6 @@ python-versions = ">=3.8"
 groups = ["test"]
 markers = "python_version <= \"3.11\" or python_version >= \"3.12\""
 files = [
-    {file = "pyasn1_modules-0.4.1-py3-none-any.whl", hash = "sha256:49bfa96b45a292b711e986f222502c1c9a5e1f4e568fc30e2574a6c7d07838fd"},
     {file = "pyasn1_modules-0.4.1.tar.gz", hash = "sha256:c28e2dbf9c06ad61c71a075c7e0f9fd0f1b0bb2d2ad4377f240d33ac2ab60a7c"},
 ]
 
@@ -8634,4 +8650,4 @@ type = ["pytest-mypy"]
 [metadata]
 lock-version = "2.1"
 python-versions = "^3.10"
-content-hash = "06debb82135affdb2baf1fdcc028c062c236121508d787588cd0de1db2da11e4"
+content-hash = "ac9af57c6abaddd1f181551a7bb8194ef3e4491391a0f2dc71417d68e85cb5b3"

docs/pyproject.toml

@@ -13,6 +13,7 @@ hub = "^3.0.1"
 
 [tool.poetry.group.docs.dependencies]
 langgraph = { path = "../libs/langgraph/", develop = true }
+langgraph-prebuilt = {path = "../libs/prebuilt", develop = true}
 langgraph-checkpoint = { path = "../libs/checkpoint/", develop = true }
 langgraph-checkpoint-sqlite = { path = "../libs/checkpoint-sqlite", develop = true }
 langgraph-checkpoint-postgres = { path = "../libs/checkpoint-postgres", develop = true }
@@ -40,8 +41,8 @@ langchain-cohere = "^0.4.2"
 
 [tool.poetry.group.test.dependencies]
 langchain = "^0.3.8"
-langchain-openai = "^0.3.0"
-langchain-anthropic = "^0.2.1"
+langchain-openai = "^0.3.7"
+langchain-anthropic = "^0.3.8"
 langchain-nomic = "^0.1.3"
 langchain-fireworks = "^0.2.0"
 langchain-community = "^0.3.0"

docs/tests/unit_tests/test_api_reference.py

@@ -0,0 +1,212 @@
+"""Test generation of links into the API reference."""
+
+import pytest
+
+from _scripts.generate_api_reference_links import (
+    update_markdown_with_imports,
+    get_imports,
+)
+
+MARKDOWN_IMPORTS = """\
+```python
+from langgraph.types import interrupt
+```
+"""
+
+EXPECTED_MARKDOWN = """\
+```python
+from langgraph.types import interrupt
+```
+
+API Reference: <a href="https://langchain-ai.github.io/langgraph/reference/types/#langgraph.types.interrupt">interrupt</a>
+"""
+
+
+def test_update_markdown_with_imports() -> None:
+    """Light weight end-to-end test."""
+    assert (
+        update_markdown_with_imports(MARKDOWN_IMPORTS, "some_path") == EXPECTED_MARKDOWN
+    )
+
+
+@pytest.mark.parametrize(
+    "code_block, expected_imports",
+    [
+        (
+            "from langgraph.types import interrupt",
+            [
+                {
+                    "docs": "https://langchain-ai.github.io/langgraph/reference/types/#langgraph.types.interrupt",
+                    "imported": "interrupt",
+                    "path": "some_path",
+                    "source": "langgraph.types",
+                }
+            ],
+        ),
+        (
+            "from langgraph.types import ( interrupt )",
+            [
+                {
+                    "docs": "https://langchain-ai.github.io/langgraph/reference/types/#langgraph.types.interrupt",
+                    "imported": "interrupt",
+                    "path": "some_path",
+                    "source": "langgraph.types",
+                }
+            ],
+        ),
+        (
+            "from langgraph.types import interrupt as foo",
+            [
+                {
+                    "docs": "https://langchain-ai.github.io/langgraph/reference/types/#langgraph.types.interrupt",
+                    "imported": "interrupt",
+                    "path": "some_path",
+                    "source": "langgraph.types",
+                }
+            ],
+        ),
+    ],
+)
+def test_get_imports(code_block: str, expected_imports: list) -> None:
+    """Get imports from a code block."""
+    assert (
+        get_imports(code_block, "some_path") == expected_imports
+    ), f"Failed for code_block=`{code_block}`"
+
+
+@pytest.mark.parametrize(
+    "code, expected_imports",
+    [
+        # Single import without parenthesis
+        (
+            "from langgraph.types import interrupt",
+            [
+                {
+                    "source": "langgraph.types",
+                    "imported": "interrupt",
+                }
+            ],
+        ),
+        # Multiple imports
+        (
+            (
+                "from langgraph.types import interrupt\n"
+                "from langgraph.func import task"
+            ),
+            [
+                {
+                    "source": "langgraph.types",
+                    "imported": "interrupt",
+                },
+                {
+                    "source": "langgraph.func",
+                    "imported": "task",
+                },
+            ],
+        ),
+        # Single import with parenthesis and extra whitespace
+        (
+            "from langgraph.types import ( interrupt )",
+            [
+                {
+                    "source": "langgraph.types",
+                    "imported": "interrupt",
+                }
+            ],
+        ),
+        # Single import with an alias
+        (
+            "from langgraph.types import interrupt as foo",
+            [
+                {
+                    "source": "langgraph.types",
+                    "imported": "interrupt",
+                }
+            ],
+        ),
+        # Multiple imports on one line with an alias
+        (
+            "from langgraph.types import interrupt, StreamWriter as bar",
+            [
+                {
+                    "source": "langgraph.types",
+                    "imported": "interrupt",
+                },
+                {
+                    "source": "langgraph.types",
+                    "imported": "StreamWriter",
+                },
+            ],
+        ),
+        # Multiple imports without aliases
+        (
+            "from langgraph.types import interrupt, StreamWriter",
+            [
+                {
+                    "source": "langgraph.types",
+                    "imported": "interrupt",
+                },
+                {
+                    "source": "langgraph.types",
+                    "imported": "StreamWriter",
+                },
+            ],
+        ),
+        # Multiline import with parenthesis and trailing comma
+        (
+            """from langgraph.types import (
+            interrupt,
+            StreamWriter as foo,
+            Command,
+        )""",
+            [
+                {
+                    "source": "langgraph.types",
+                    "imported": "interrupt",
+                },
+                {
+                    "source": "langgraph.types",
+                    "imported": "StreamWriter",
+                },
+                {
+                    "source": "langgraph.types",
+                    "imported": "Command",
+                },
+            ],
+        ),
+        # Multiline import with parenthesis and trailing comma
+        (
+            (
+                "from langgraph.types import (\n"
+                "        interrupt,\n"
+                "        StreamWriter as foo\n,"
+                "        Command,\n"
+                ")\n"
+                "def foo():\n"
+                "    pass\n"
+                ""
+            ),
+            [
+                {
+                    "source": "langgraph.types",
+                    "imported": "interrupt",
+                },
+                {
+                    "source": "langgraph.types",
+                    "imported": "StreamWriter",
+                },
+                {
+                    "source": "langgraph.types",
+                    "imported": "Command",
+                },
+            ],
+        ),
+    ],
+)
+def test_regexp_matching(code: str, expected_imports: list) -> None:
+    results = get_imports(code, "some_path")
+    for result in results:
+        del result["docs"]
+        del result["path"]
+
+    assert results == expected_imports

libs/checkpoint-sqlite/poetry.lock

@@ -1,23 +1,23 @@
-# This file is automatically @generated by Poetry 2.0.0 and should not be changed by hand.
+# This file is automatically @generated by Poetry 2.0.1 and should not be changed by hand.
 
 [[package]]
 name = "aiosqlite"
-version = "0.20.0"
+version = "0.21.0"
 description = "asyncio bridge to the standard sqlite3 module"
 optional = false
-python-versions = ">=3.8"
+python-versions = ">=3.9"
 groups = ["main"]
 files = [
-    {file = "aiosqlite-0.20.0-py3-none-any.whl", hash = "sha256:36a1deaca0cac40ebe32aac9977a6e2bbc7f5189f23f4a54d5908986729e5bd6"},
-    {file = "aiosqlite-0.20.0.tar.gz", hash = "sha256:6d35c8c256637f4672f843c31021464090805bf925385ac39473fb16eaaca3d7"},
+    {file = "aiosqlite-0.21.0-py3-none-any.whl", hash = "sha256:2549cf4057f95f53dcba16f2b64e8e2791d7e1adedb13197dd8ed77bb226d7d0"},
+    {file = "aiosqlite-0.21.0.tar.gz", hash = "sha256:131bb8056daa3bc875608c631c678cda73922a2d4ba8aec373b19f18c17e7aa3"},
 ]
 
 [package.dependencies]
 typing_extensions = ">=4.0"
 
 [package.extras]
-dev = ["attribution (==1.7.0)", "black (==24.2.0)", "coverage[toml] (==7.4.1)", "flake8 (==7.0.0)", "flake8-bugbear (==24.2.6)", "flit (==3.9.0)", "mypy (==1.8.0)", "ufmt (==2.3.0)", "usort (==1.0.8.post1)"]
-docs = ["sphinx (==7.2.6)", "sphinx-mdinclude (==0.5.3)"]
+dev = ["attribution (==1.7.1)", "black (==24.3.0)", "build (>=1.2)", "coverage[toml] (==7.6.10)", "flake8 (==7.0.0)", "flake8-bugbear (==24.12.12)", "flit (==3.10.1)", "mypy (==1.14.1)", "ufmt (==2.5.1)", "usort (==1.0.8.post1)"]
+docs = ["sphinx (==8.1.3)", "sphinx-mdinclude (==0.6.1)"]
 
 [[package]]
 name = "annotated-types"
@@ -1043,4 +1043,4 @@ watchmedo = ["PyYAML (>=3.10)"]
 [metadata]
 lock-version = "2.1"
 python-versions = "^3.9.0"
-content-hash = "e6d3ca9bce723c05f4c5ae9dc4bee872f7581b7763680b34112f1d280f5a9b0a"
+content-hash = "21896b8d3d283d95bc3988aa93f06faf5c47dadc2a8822e5a35672b9cb054693"

libs/checkpoint-sqlite/pyproject.toml

@@ -11,7 +11,7 @@ packages = [{ include = "langgraph" }]
 [tool.poetry.dependencies]
 python = "^3.9.0"
 langgraph-checkpoint = "^2.0.15"
-aiosqlite = "^0.20.0"
+aiosqlite = ">=0.20,<0.22"
 
 [tool.poetry.group.dev.dependencies]
 ruff = "^0.6.2"

libs/checkpoint/README.md

@@ -1,6 +1,6 @@
 # LangGraph Checkpoint
 
-This library defines the base interface for LangGraph checkpointers. Checkpointers provide persistence layer for LangGraph. They allow you to interact with and manage the graph's state. When you use a graph with a checkpointer, the checkpointer saves a _checkpoint_ of the graph state at every superstep, enabling several powerful capabilities like human-in-the-loop, "memory" between interactions and more.
+This library defines the base interface for LangGraph checkpointers. Checkpointers provide a persistence layer for LangGraph. They allow you to interact with and manage the graph's state. When you use a graph with a checkpointer, the checkpointer saves a _checkpoint_ of the graph state at every superstep, enabling several powerful capabilities like human-in-the-loop, "memory" between interactions and more.
 
 ## Key concepts
 
@@ -12,8 +12,8 @@ Checkpoint is a snapshot of the graph state at a given point in time. Checkpoint
 
 Threads enable the checkpointing of multiple different runs, making them essential for multi-tenant chat applications and other scenarios where maintaining separate states is necessary. A thread is a unique ID assigned to a series of checkpoints saved by a checkpointer. When using a checkpointer, you must specify a `thread_id` and optionally `checkpoint_id` when running the graph.
 
-- `thread_id` is simply the ID of a thread. This is always required
-- `checkpoint_id` can optionally be passed. This identifier refers to a specific checkpoint within a thread. This can be used to kick of a run of a graph from some point halfway through a thread.
+- `thread_id` is simply the ID of a thread. This is always required.
+- `checkpoint_id` can optionally be passed. This identifier refers to a specific checkpoint within a thread. This can be used to kick off a run of a graph from some point halfway through a thread.
 
 You must pass these when invoking the graph as part of the configurable part of the config, e.g.
 

libs/cli/examples/my_app.py

@@ -2,7 +2,7 @@ from contextlib import asynccontextmanager
 from contextvars import ContextVar
 from typing import Any
 
-from starlette import Starlette
+from starlette.applications import Starlette
 from starlette.middleware.base import BaseHTTPMiddleware
 from starlette.responses import JSONResponse
 from starlette.routing import Route
@@ -12,7 +12,6 @@ LIFESPAN_VAL = ""
 other_context_var = ContextVar("other_context_var", default="")
 
 
-@asynccontextmanager
 @asynccontextmanager
 async def my_lifespan(app):
     global LIFESPAN_VAL
@@ -33,12 +32,14 @@ class MyContextMiddleware(BaseHTTPMiddleware):
 
 
 async def custom_my_route(request):
+    """A great route."""
     assert my_context_var.get() == "Foobar"
     assert LIFESPAN_VAL == "foobar-lifespan"
     return JSONResponse({"foo": "bar"})
 
 
 async def runs_afakeroute(request):
+    """Another great route."""
     assert my_context_var.get() == "Foobar"
     assert LIFESPAN_VAL == "foobar-lifespan"
     return JSONResponse({"foo": "afakeroute"})
@@ -52,7 +53,7 @@ async def other_middleware(request: Any, call_next: Any) -> Any:
 
 
 app = Starlette(
-    middleware=[MyContextMiddleware],
+    middleware=[(MyContextMiddleware, {}, {})],
     routes=[
         Route("/custom/my-route", custom_my_route),
         Route("/runs/afakeroute", runs_afakeroute),

libs/cli/langgraph_cli/cli.py

@@ -650,6 +650,7 @@ def dev(
         store=config_json.get("store"),
         wait_for_client=wait_for_client,
         auth=config_json.get("auth"),
+        http=config_json.get("http"),
     )
 
 

libs/cli/langgraph_cli/config.py

@@ -479,47 +479,6 @@ def _assemble_local_deps(config_path: pathlib.Path, config: Config) -> LocalDeps
                     )
                 )
 
-    if auth_conf := config.get("auth"):
-        if auth_path := auth_conf.get("path"):
-            module_str, _, _ = auth_path.partition(":")
-            if module_str.startswith("."):
-                auth_file = (config_path.parent / module_str).resolve()
-                auth_dir = auth_file.parent
-                if (config_path.parent not in auth_dir.parents) and (
-                    auth_dir not in additional_contexts
-                ):
-                    additional_contexts.append(auth_dir)
-                # Also add auth_dir to faux_pkgs if not already added.
-                if auth_dir not in real_pkgs and auth_dir not in faux_pkgs:
-                    files = os.listdir(auth_dir)
-                    if "__init__.py" in files:
-                        container_path = (
-                            f"/deps/__outer_{auth_dir.name}/{auth_dir.name}"
-                        )
-                    else:
-                        container_path = f"/deps/__outer_{auth_dir.name}/src"
-                    faux_pkgs[auth_dir] = (str(auth_dir), container_path)
-    if http_conf := config.get("http"):
-        if http_path := http_conf.get("app"):
-            module_str, _, _ = http_path.partition(":")
-            if module_str.startswith("."):
-                http_file = (config_path.parent / module_str).resolve()
-                http_dir = http_file.parent
-                if (config_path.parent not in http_dir.parents) and (
-                    http_dir not in additional_contexts
-                ):
-                    additional_contexts.append(http_dir)
-                # Also add http_dir to faux_pkgs if not already added.
-                if http_dir not in real_pkgs and http_dir not in faux_pkgs:
-                    files = os.listdir(http_dir)
-                    if "__init__.py" in files:
-                        container_path = (
-                            f"/deps/__outer_{http_dir.name}/{http_dir.name}"
-                        )
-                    else:
-                        container_path = f"/deps/__outer_{http_dir.name}/src"
-                    faux_pkgs[http_dir] = (str(http_dir), container_path)
-
     return LocalDeps(pip_reqs, real_pkgs, faux_pkgs, working_dir, additional_contexts)
 
 
@@ -639,17 +598,9 @@ def _update_auth_path(
             auth_conf["path"] = new_path
             return
 
-    # -- New: Check additional contexts for auth --
-    for add_ctx in local_deps.additional_contexts:
-        if resolved.is_relative_to(add_ctx):
-            new_path = f"/deps/__outer_{add_ctx.name}/{resolved.relative_to(add_ctx)}:{attr_str}"
-            auth_conf["path"] = new_path
-            return
-    # ------------------------------------------------
-
     raise ValueError(
-        f"Auth file '{resolved}' not covered by dependencies or additional contexts.\n"
-        "Add its parent directory to the 'dependencies' array in your config, or let the auto-include logic add it.\n"
+        f"Auth file '{resolved}' not covered by dependencies.\n"
+        "Add its parent directory to the 'dependencies' array in your config.\n"
         f"Current dependencies: {config['dependencies']}"
     )
 
@@ -699,16 +650,10 @@ def _update_http_app_path(
                         module_str = f"{destpath}/{container_subpath.as_posix()}"
                         break
                 else:
-                    # -- New: Check additional contexts for HTTP app --
-                    for add_ctx in local_deps.additional_contexts:
-                        if resolved.is_relative_to(add_ctx):
-                            module_str = f"/deps/__outer_{add_ctx.name}/{resolved.relative_to(add_ctx)}"
-                            break
-                    else:
-                        raise ValueError(
-                            f"HTTP app module '{app_str}' not found in 'dependencies' or additional contexts. "
-                            "Add its containing package to 'dependencies' list."
-                        )
+                    raise ValueError(
+                        f"HTTP app module '{app_str}' not found in 'dependencies' list. "
+                        "Add its containing package to 'dependencies' list."
+                    )
         # update the config
         http_config["app"] = f"{module_str}:{attr_str}"
 
@@ -742,11 +687,9 @@ def python_config_to_docker(
     pip_pkgs_str = f"RUN {pip_install} {' '.join(pypi_deps)}" if pypi_deps else ""
     if local_deps.pip_reqs:
         pip_reqs_str = os.linesep.join(
-            (
-                f"COPY --from=__outer_{reqpath.name} requirements.txt {destpath}"
-                if reqpath.parent in local_deps.additional_contexts
-                else f"ADD {reqpath.relative_to(config_path.parent)} {destpath}"
-            )
+            f"COPY --from=__outer_{reqpath.name} requirements.txt {destpath}"
+            if reqpath.parent in local_deps.additional_contexts
+            else f"ADD {reqpath.relative_to(config_path.parent)} {destpath}"
             for reqpath, destpath in local_deps.pip_reqs
         )
         pip_reqs_str += f'{os.linesep}RUN {pip_install} {" ".join("-r " + r for _,r in local_deps.pip_reqs)}'
@@ -781,15 +724,13 @@ RUN set -ex && \\
     )
 
     local_pkgs_str = os.linesep.join(
-        (
-            f"""# -- Adding local package {relpath} --
+        f"""# -- Adding local package {relpath} --
 COPY --from={name} . /deps/{name}
 # -- End of local package {relpath} --"""
-            if fullpath in local_deps.additional_contexts
-            else f"""# -- Adding local package {relpath} --
+        if fullpath in local_deps.additional_contexts
+        else f"""# -- Adding local package {relpath} --
 ADD {relpath} /deps/{name}
 # -- End of local package {relpath} --"""
-        )
         for fullpath, (relpath, name) in local_deps.real_pkgs.items()
     )
 

libs/cli/pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "langgraph-cli"
-version = "0.1.71"
+version = "0.1.73"
 description = "CLI for interacting with LangGraph API"
 authors = []
 license = "MIT"
@@ -14,7 +14,7 @@ langgraph = "langgraph_cli.cli:cli"
 [tool.poetry.dependencies]
 python = "^3.9.0,<4.0"
 click = "^8.1.7"
-langgraph-api = { version = ">=0.0.12,<0.1.0", optional = true, python = ">=3.11,<4.0" }
+langgraph-api = { version = ">=0.0.26,<0.1.0", optional = true, python = ">=3.11,<4.0" }
 python-dotenv = { version = ">=0.8.0", optional = true }
 
 [tool.poetry.group.dev.dependencies]

libs/cli/tests/unit_tests/graphs/agent.py

@@ -0,0 +1,6 @@
+from langgraph.func import entrypoint
+
+
+@entrypoint()
+def graph(state):
+    return None

libs/cli/tests/unit_tests/test_config.py

@@ -195,7 +195,7 @@ def test_config_to_docker_simple():
         PATH_TO_CONFIG,
         validate_config(
             {
-                "dependencies": [".", "../../examples/graphs_reqs_a"],
+                "dependencies": [".", "../../examples/graphs_reqs_a", "../../examples"],
                 "graphs": graphs,
                 "http": {"app": "../../examples/my_app.py:app"},
             }

libs/langgraph/README.md

@@ -70,7 +70,7 @@ pip install -U langgraph
 Let's build a tool-calling [ReAct-style](https://langchain-ai.github.io/langgraph/concepts/agentic_concepts/#react-implementation) agent that uses a search tool!
 
 ```shell
-pip install langchain-anthropic
+pip install langgraph-prebuilt langchain-anthropic
 ```
 
 ```shell

libs/langgraph/langgraph/config.py

@@ -1,5 +1,6 @@
 import asyncio
 import sys
+from typing import Any
 
 from langchain_core.runnables import RunnableConfig
 from langchain_core.runnables.config import var_child_runnable_config
@@ -9,6 +10,10 @@ from langgraph.store.base import BaseStore
 from langgraph.types import StreamWriter
 
 
+def _no_op_stream_writer(c: Any) -> None:
+    pass
+
+
 def get_config() -> RunnableConfig:
     if sys.version_info < (3, 11):
         try:
@@ -177,4 +182,4 @@ def get_stream_writer() -> StreamWriter:
         ```
     """
     config = get_config()
-    return config[CONF][CONFIG_KEY_STREAM_WRITER]
+    return config[CONF].get(CONFIG_KEY_STREAM_WRITER, _no_op_stream_writer)

libs/langgraph/langgraph/graph/state.py

@@ -675,7 +675,9 @@ class CompiledStateGraph(CompiledGraph):
             elif isinstance(input, Command):
                 if input.graph == Command.PARENT:
                     return None
-                return input._update_as_tuples()
+                return [
+                    (k, v) for k, v in input._update_as_tuples() if k in output_keys
+                ]
             elif (
                 isinstance(input, (list, tuple))
                 and input
@@ -686,7 +688,9 @@ class CompiledStateGraph(CompiledGraph):
                     if isinstance(i, Command):
                         if i.graph == Command.PARENT:
                             continue
-                        updates.extend(i._update_as_tuples())
+                        updates.extend(
+                            (k, v) for k, v in i._update_as_tuples() if k in output_keys
+                        )
                     else:
                         updates.extend(_get_updates(i) or ())
                 return updates

libs/langgraph/langgraph/prebuilt/tool_executor.py

@@ -1,134 +0,0 @@
-from typing import Any, Callable, Sequence, Union
-
-from langchain_core.load.serializable import Serializable
-from langchain_core.runnables import RunnableConfig
-from langchain_core.tools import BaseTool
-from langchain_core.tools import tool as create_tool
-
-from langgraph._api.deprecation import deprecated
-from langgraph.utils.runnable import RunnableCallable
-
-INVALID_TOOL_MSG_TEMPLATE = (
-    "{requested_tool_name} is not a valid tool, "
-    "try one of [{available_tool_names_str}]."
-)
-
-
-@deprecated("0.2.0", "langgraph.prebuilt.ToolNode", removal="0.3.0")
-class ToolInvocationInterface:
-    """Interface for invoking a tool.
-
-    Attributes:
-        tool (str): The name of the tool to invoke.
-        tool_input (Union[str, dict]): The input to pass to the tool.
-
-    """
-
-    tool: str
-    tool_input: Union[str, dict]
-
-
-@deprecated("0.2.0", "langgraph.prebuilt.ToolNode", removal="0.3.0")
-class ToolInvocation(Serializable):
-    """Information about how to invoke a tool.
-
-    Attributes:
-        tool (str): The name of the Tool to execute.
-        tool_input (Union[str, dict]): The input to pass in to the Tool.
-
-    Examples:
-        Basic usage:
-        ```pycon
-        >>> invocation = ToolInvocation(
-        ...    tool="search",
-        ...     tool_input="What is the capital of France?"
-        ... )
-        ```
-    """
-
-    tool: str
-    tool_input: Union[str, dict]
-
-
-@deprecated("0.2.0", "langgraph.prebuilt.ToolNode", removal="0.3.0")
-class ToolExecutor(RunnableCallable):
-    """Executes a tool invocation.
-
-    Args:
-        tools (Sequence[BaseTool]): A sequence of tools that can be invoked.
-        invalid_tool_msg_template (str, optional): The template for the error message
-            when an invalid tool is requested. Defaults to INVALID_TOOL_MSG_TEMPLATE.
-
-    Examples:
-        Basic usage:
-
-        ```pycon
-        >>> from langchain_core.tools import tool
-        >>> from langgraph.prebuilt.tool_executor import ToolExecutor, ToolInvocation
-        ...
-        ...
-        >>> @tool
-        ... def search(query: str) -> str:
-        ...     \"\"\"Search engine.\"\"\"
-        ...     return f"Searching for: {query}"
-        ...
-        ...
-        >>> tools = [search]
-        >>> executor = ToolExecutor(tools)
-        ...
-        >>> invocation = ToolInvocation(tool="search", tool_input="What is the capital of France?")
-        >>> result = executor.invoke(invocation)
-        >>> print(result)
-        "Searching for: What is the capital of France?"
-        ```
-        Handling invalid tool:
-
-        ```pycon
-        >>> invocation = ToolInvocation(
-        ...     tool="nonexistent", tool_input="What is the capital of France?"
-        ... )
-        >>> result = executor.invoke(invocation)
-        >>> print(result)
-        "nonexistent is not a valid tool, try one of [search]."
-        ```
-    """
-
-    def __init__(
-        self,
-        tools: Sequence[Union[BaseTool, Callable]],
-        *,
-        invalid_tool_msg_template: str = INVALID_TOOL_MSG_TEMPLATE,
-    ) -> None:
-        super().__init__(self._execute, afunc=self._aexecute, trace=False)
-        tools_ = [
-            tool if isinstance(tool, BaseTool) else create_tool(tool) for tool in tools
-        ]
-        self.tools = tools_
-        self.tool_map = {t.name: t for t in tools_}
-        self.invalid_tool_msg_template = invalid_tool_msg_template
-
-    def _execute(
-        self, tool_invocation: ToolInvocationInterface, config: RunnableConfig
-    ) -> Any:
-        if tool_invocation.tool not in self.tool_map:
-            return self.invalid_tool_msg_template.format(
-                requested_tool_name=tool_invocation.tool,
-                available_tool_names_str=", ".join([t.name for t in self.tools]),
-            )
-        else:
-            tool = self.tool_map[tool_invocation.tool]
-            output = tool.invoke(tool_invocation.tool_input, config)
-            return output
-
-    async def _aexecute(
-        self, tool_invocation: ToolInvocationInterface, config: RunnableConfig
-    ) -> Any:
-        if tool_invocation.tool not in self.tool_map:
-            return self.invalid_tool_msg_template.format(
-                requested_tool_name=tool_invocation.tool,
-                available_tool_names_str=", ".join([t.name for t in self.tools]),
-            )
-        else:
-            tool = self.tool_map[tool_invocation.tool]
-            output = await tool.ainvoke(tool_invocation.tool_input, config)
-            return output

libs/langgraph/langgraph/pregel/__init__.py

@@ -200,10 +200,42 @@ class Channel:
 class Pregel(PregelProtocol):
     """Pregel manages the runtime behavior for LangGraph applications.
 
+    ## Overview
+
+    Pregel combines [**actors**](https://en.wikipedia.org/wiki/Actor_model)
+    and **channels** into a single application.
+    **Actors** read data from channels and write data to channels.
+    Pregel organizes the execution of the application into multiple steps,
+    following the **Pregel Algorithm**/**Bulk Synchronous Parallel** model.
+
+    Each step consists of three phases:
+
+    - **Plan**: Determine which **actors** to execute in this step. For example,
+        in the first step, select the **actors** that subscribe to the special
+        **input** channels; in subsequent steps,
+        select the **actors** that subscribe to channels updated in the previous step.
+    - **Execution**: Execute all selected **actors** in parallel,
+        until all complete, or one fails, or a timeout is reached. During this
+        phase, channel updates are invisible to actors until the next step.
+    - **Update**: Update the channels with the values written by the **actors**
+        in this step.
+
+    Repeat until no **actors** are selected for execution, or a maximum number of
+    steps is reached.
+
+    ## Actors
+
+    An **actor** is a [PregelNode][langgraph.pregel.read.PregelNode].
+    It subscribes to channels, reads data from them, and writes data to them.
+    It can be thought of as an **actor** in the Pregel algorithm.
+    [PregelNodes][langgraph.pregel.read.PregelNode] implement LangChain's
+    Runnable interface.
+
     ## Channels
 
-    Channels are used to communicate between chains. Each channel has a value type,
-    an update type, and an update function – which takes a sequence of updates and
+    Channels are used to communicate between actors (PregelNodes).
+    Each channel has a value type, an update type, and an update function – which
+    takes a sequence of updates and
     modifies the stored value. Channels can be used to send data from one chain to
     another, or to send data from a chain to itself in a future step. LangGraph
     provides a number of built-in channels:
@@ -213,7 +245,7 @@ class Pregel(PregelProtocol):
     - `LastValue`: The default channel, stores the last value sent to the channel,
        useful for input and output values, or for sending data from one step to the next
     - `Topic`: A configurable PubSub Topic, useful for sending multiple values
-       between chains, or for accumulating output. Can be configured to deduplicate
+       between *actors*, or for accumulating output. Can be configured to deduplicate
        values, and/or to accumulate values over the course of multiple steps.
 
     ### Advanced channels: Context and BinaryOperatorAggregate
@@ -226,30 +258,202 @@ class Pregel(PregelProtocol):
        sent to the channel, useful for computing aggregates over multiple steps. eg.
       `total = BinaryOperatorAggregate(int, operator.add)`
 
-    ## Chains
+    ## Examples
 
-    Chains are LCEL Runnables which subscribe to one or more channels, and write to
-    one or more channels. Any valid LCEL expression can be used as a chain. Chains
-    can be combined into a Pregel application, which coordinates the execution of the
-    chains across multiple steps.
+    Most users will interact with Pregel via a
+    [StateGraph (Graph API)][langgraph.graph.StateGraph] or via an
+    [entrypoint (Functional API)][langgraph.func.entrypoint].
 
-    ## Pregel
+    However, for **advanced** use cases, Pregel can be used directly. If you're
+    not sure whether you need to use Pregel directly, then the answer is probably no
+    – you should use the Graph API or Functional API instead. These are higher-level
+    interfaces that will compile down to Pregel under the hood.
 
-    Pregel combines multiple chains (or actors) into a single application. It
-    coordinates the execution of the chains across multiple steps, following the
-    Pregel/Bulk Synchronous Parallel model. Each step consists of three phases:
+    Here are some examples to give you a sense of how it works:
 
-    - **Plan**: Determine which chains to execute in this step, ie. the chains that
-      subscribe to channels updated in the previous step (or, in the first step,
-      chains that subscribe to input channels)
-    - **Execution**: Execute those chains in parallel, until all complete, or one fails,
-      or a timeout is reached. Any channel updates are invisible to other
-      chains until the next step.
-     - **Update**: Update the channels with the values written by the
-      chains in this step.
+    Example: Single node application
+        ```python
+        from langgraph.channels import EphemeralValue
+        from langgraph.pregel import Pregel, Channel, ChannelWriteEntry
 
-    Repeat until no chains are planned for execution, or a maximum number of steps
-    is reached.
+        node1 = (
+            Channel.subscribe_to("a")
+            | (lambda x: x + x)
+            | Channel.write_to("b")
+        )
+
+        app = Pregel(
+            nodes={"node1": node1},
+            channels={
+                "a": EphemeralValue(str),
+                "b": EphemeralValue(str),
+            },
+            input_channels=["a"],
+            output_channels=["b"],
+        )
+
+        app.invoke({"a": "foo"})
+        ```
+
+        ```con
+        {'b': 'foofoo'}
+        ```
+
+    Example: Using multiple nodes and multiple output channels
+        ```python
+        from langgraph.channels import LastValue, EphemeralValue
+        from langgraph.pregel import Pregel, Channel, ChannelWriteEntry
+
+        node1 = (
+            Channel.subscribe_to("a")
+            | (lambda x: x + x)
+            | Channel.write_to("b")
+        )
+
+        node2 = (
+            Channel.subscribe_to("b")
+            | (lambda x: x + x)
+            | Channel.write_to("c")
+        )
+
+
+        app = Pregel(
+            nodes={"node1": node1, "node2": node2},
+            channels={
+                "a": EphemeralValue(str),
+                "b": LastValue(str),
+                "c": EphemeralValue(str),
+            },
+            input_channels=["a"],
+            output_channels=["b", "c"],
+        )
+
+        app.invoke({"a": "foo"})
+        ```
+
+        ```con
+        {'b': 'foofoo', 'c': 'foofoofoofoo'}
+        ```
+
+    Example: Using a Topic channel
+        ```python
+        from langgraph.channels import LastValue, EphemeralValue, Topic
+        from langgraph.pregel import Pregel, Channel, ChannelWriteEntry
+
+        node1 = (
+            Channel.subscribe_to("a")
+            | (lambda x: x + x)
+            | {
+                "b": Channel.write_to("b"),
+                "c": Channel.write_to("c")
+            }
+        )
+
+        node2 = (
+            Channel.subscribe_to("b")
+            | (lambda x: x + x)
+            | {
+                "c": Channel.write_to("c"),
+            }
+        )
+
+
+        app = Pregel(
+            nodes={"node1": node1, "node2": node2},
+            channels={
+                "a": EphemeralValue(str),
+                "b": EphemeralValue(str),
+                "c": Topic(str, accumulate=True),
+            },
+            input_channels=["a"],
+            output_channels=["c"],
+        )
+
+        app.invoke({"a": "foo"})
+        ```
+
+        ```pycon
+        {'c': ['foofoo', 'foofoofoofoo']}
+        ```
+
+    Example: Using a BinaryOperatorAggregate channel
+        ```python
+        from langgraph.channels import EphemeralValue, BinaryOperatorAggregate
+        from langgraph.pregel import Pregel, Channel
+
+
+        node1 = (
+            Channel.subscribe_to("a")
+            | (lambda x: x + x)
+            | {
+                "b": Channel.write_to("b"),
+                "c": Channel.write_to("c")
+            }
+        )
+
+        node2 = (
+            Channel.subscribe_to("b")
+            | (lambda x: x + x)
+            | {
+                "c": Channel.write_to("c"),
+            }
+        )
+
+
+        def reducer(current, update):
+            if current:
+                return current + " | " + "update"
+            else:
+                return update
+
+        app = Pregel(
+            nodes={"node1": node1, "node2": node2},
+            channels={
+                "a": EphemeralValue(str),
+                "b": EphemeralValue(str),
+                "c": BinaryOperatorAggregate(str, operator=reducer),
+            },
+            input_channels=["a"],
+            output_channels=["c"]
+        )
+
+        app.invoke({"a": "foo"})
+        ```
+
+        ```con
+        {'c': 'foofoo | foofoofoofoo'}
+        ```
+
+    Example: Introducing a cycle
+        This example demonstrates how to introduce a cycle in the graph, by having
+        a chain write to a channel it subscribes to. Execution will continue
+        until a None value is written to the channel.
+
+        ```python
+        from langgraph.channels import EphemeralValue
+        from langgraph.pregel import Pregel, Channel, ChannelWrite, ChannelWriteEntry
+
+        example_node = (
+            Channel.subscribe_to("value")
+            | (lambda x: x + x if len(x) < 10 else None)
+            | ChannelWrite(writes=[ChannelWriteEntry(channel="value", skip_none=True)])
+        )
+
+        app = Pregel(
+            nodes={"example_node": example_node},
+            channels={
+                "value": EphemeralValue(str),
+            },
+            input_channels=["value"],
+            output_channels=["value"]
+        )
+
+        app.invoke({"value": "a"})
+        ```
+
+        ```con
+        {'value': 'aaaaaaaaaaaaaaaa'}
+        ```
     """
 
     nodes: dict[str, PregelNode]
@@ -767,6 +971,12 @@ class Pregel(PregelProtocol):
                 raise ValueError(f"Subgraph {recast} not found")
 
         config = merge_configs(self.config, config) if self.config else config
+        if self.checkpointer is True:
+            ns = cast(str, config[CONF][CONFIG_KEY_CHECKPOINT_NS])
+            config = merge_configs(
+                config, {CONF: {CONFIG_KEY_CHECKPOINT_NS: recast_checkpoint_ns(ns)}}
+            )
+
         saved = checkpointer.get_tuple(config)
         return self._prepare_state_snapshot(
             config,
@@ -800,6 +1010,12 @@ class Pregel(PregelProtocol):
                 raise ValueError(f"Subgraph {recast} not found")
 
         config = merge_configs(self.config, config) if self.config else config
+        if self.checkpointer is True:
+            ns = cast(str, config[CONF][CONFIG_KEY_CHECKPOINT_NS])
+            config = merge_configs(
+                config, {CONF: {CONFIG_KEY_CHECKPOINT_NS: recast_checkpoint_ns(ns)}}
+            )
+
         saved = await checkpointer.aget_tuple(config)
         return await self._aprepare_state_snapshot(
             config,
@@ -1707,9 +1923,7 @@ class Pregel(PregelProtocol):
             # set up subgraph checkpointing
             if self.checkpointer is True:
                 ns = cast(str, config[CONF][CONFIG_KEY_CHECKPOINT_NS])
-                config[CONF][CONFIG_KEY_CHECKPOINT_NS] = NS_SEP.join(
-                    part.split(NS_END)[0] for part in ns.split(NS_SEP)
-                )
+                config[CONF][CONFIG_KEY_CHECKPOINT_NS] = recast_checkpoint_ns(ns)
             # set up messages stream mode
             if "messages" in stream_modes:
                 run_manager.inheritable_handlers.append(
@@ -1997,9 +2211,7 @@ class Pregel(PregelProtocol):
             # set up subgraph checkpointing
             if self.checkpointer is True:
                 ns = cast(str, config[CONF][CONFIG_KEY_CHECKPOINT_NS])
-                config[CONF][CONFIG_KEY_CHECKPOINT_NS] = NS_SEP.join(
-                    part.split(NS_END)[0] for part in ns.split(NS_SEP)
-                )
+                config[CONF][CONFIG_KEY_CHECKPOINT_NS] = recast_checkpoint_ns(ns)
             # set up messages stream mode
             if "messages" in stream_modes:
                 run_manager.inheritable_handlers.append(

libs/langgraph/langgraph/pregel/loop.py

@@ -888,7 +888,11 @@ class SyncPregelLoop(PregelLoop, ContextManager):
             )
 
     def _update_mv(self, key: str, values: Sequence[Any]) -> None:
-        return self.submit(cast(WritableManagedValue, self.managed[key]).update, values)
+        managed_value = self.managed.get(key)
+        if managed_value is None:
+            return
+
+        return self.submit(cast(WritableManagedValue, managed_value).update, values)
 
     # context manager
 
@@ -1023,9 +1027,11 @@ class AsyncPregelLoop(PregelLoop, AsyncContextManager):
             )
 
     def _update_mv(self, key: str, values: Sequence[Any]) -> None:
-        return self.submit(
-            cast(WritableManagedValue, self.managed[key]).aupdate, values
-        )
+        managed_value = self.managed.get(key)
+        if managed_value is None:
+            return
+
+        return self.submit(cast(WritableManagedValue, managed_value).aupdate, values)
 
     # context manager
 

libs/langgraph/langgraph/pregel/messages.py

@@ -127,6 +127,16 @@ class StreamMessagesHandler(BaseCallbackHandler, _StreamingCallbackHandler):
                 tuple(cast(str, metadata["langgraph_checkpoint_ns"]).split(NS_SEP)),
                 metadata,
             )
+            if isinstance(inputs, dict):
+                for key, value in inputs.items():
+                    if isinstance(value, BaseMessage):
+                        if value.id is not None:
+                            self.seen.add(value.id)
+                    elif isinstance(value, Sequence) and not isinstance(value, str):
+                        for item in value:
+                            if isinstance(item, BaseMessage):
+                                if item.id is not None:
+                                    self.seen.add(item.id)
 
     def on_chain_end(
         self,

libs/langgraph/langgraph/pregel/validate.py

@@ -32,11 +32,17 @@ def validate_graph(
 
     for chan in subscribed_channels:
         if chan not in channels:
-            raise ValueError(f"Subscribed channel '{chan}' not in 'channels'")
+            raise ValueError(
+                f"Subscribed channel '{chan}' not "
+                f"in known channels: '{repr(sorted(channels))[:100]}'"
+            )
 
     if isinstance(input_channels, str):
         if input_channels not in channels:
-            raise ValueError(f"Input channel '{input_channels}' not in 'channels'")
+            raise ValueError(
+                f"Input channel '{input_channels}' not "
+                f"in known channels: '{repr(sorted(channels))[:100]}'"
+            )
         if input_channels not in subscribed_channels:
             raise ValueError(
                 f"Input channel {input_channels} is not subscribed to by any node"
@@ -44,10 +50,13 @@ def validate_graph(
     else:
         for chan in input_channels:
             if chan not in channels:
-                raise ValueError(f"Input channel '{chan}' not in 'channels'")
+                raise ValueError(
+                    f"Input channel '{chan}' not in '{repr(sorted(channels))[:100]}'"
+                )
         if all(chan not in subscribed_channels for chan in input_channels):
             raise ValueError(
-                f"None of the input channels {input_channels} are subscribed to by any node"
+                f"None of the input channels {input_channels} "
+                f"are subscribed to by any node"
             )
 
     all_output_channels = set[str]()
@@ -62,7 +71,10 @@ def validate_graph(
 
     for chan in all_output_channels:
         if chan not in channels:
-            raise ValueError(f"Output channel '{chan}' not in 'channels'")
+            raise ValueError(
+                f"Output channel '{chan}' not "
+                f"in known channels: '{repr(sorted(channels))[:100]}'"
+            )
 
     if interrupt_after_nodes != "*":
         for n in interrupt_after_nodes:

libs/langgraph/poetry.lock

@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 2.0.0 and should not be changed by hand.
+# This file is automatically @generated by Poetry 2.0.1 and should not be changed by hand.
 
 [[package]]
 name = "aiosqlite"
@@ -1348,7 +1348,7 @@ typing-extensions = ">=4.7"
 
 [[package]]
 name = "langgraph-checkpoint"
-version = "2.0.10"
+version = "2.0.16"
 description = "Library with base interfaces for LangGraph checkpoint savers."
 optional = false
 python-versions = "^3.9.0,<4.0"
@@ -1366,7 +1366,7 @@ url = "../checkpoint"
 
 [[package]]
 name = "langgraph-checkpoint-postgres"
-version = "2.0.12"
+version = "2.0.15"
 description = "Library with a Postgres implementation of LangGraph checkpoint saver."
 optional = false
 python-versions = "^3.9.0,<4.0"
@@ -1375,7 +1375,7 @@ files = []
 develop = true
 
 [package.dependencies]
-langgraph-checkpoint = "^2.0.10"
+langgraph-checkpoint = "^2.0.15"
 orjson = ">=3.10.1"
 psycopg = "^3.2.0"
 psycopg-pool = "^3.2.0"
@@ -1386,7 +1386,7 @@ url = "../checkpoint-postgres"
 
 [[package]]
 name = "langgraph-checkpoint-sqlite"
-version = "2.0.3"
+version = "2.0.5"
 description = "Library with a SQLite implementation of LangGraph checkpoint saver."
 optional = false
 python-versions = "^3.9.0"
@@ -1395,16 +1395,35 @@ files = []
 develop = true
 
 [package.dependencies]
-aiosqlite = "^0.20.0"
-langgraph-checkpoint = "^2.0.10"
+aiosqlite = ">=0.20,<0.22"
+langgraph-checkpoint = "^2.0.15"
 
 [package.source]
 type = "directory"
 url = "../checkpoint-sqlite"
 
+[[package]]
+name = "langgraph-prebuilt"
+version = "0.1.0"
+description = "Library with high-level APIs for creating and executing LangGraph agents and tools."
+optional = false
+python-versions = "^3.9.0,<4.0"
+groups = ["dev"]
+files = []
+develop = true
+
+[package.dependencies]
+langchain-core = ">=0.2.43,<0.4.0,!=0.3.0,!=0.3.1,!=0.3.2,!=0.3.3,!=0.3.4,!=0.3.5,!=0.3.6,!=0.3.7,!=0.3.8,!=0.3.9,!=0.3.10,!=0.3.11,!=0.3.12,!=0.3.13,!=0.3.14,!=0.3.15,!=0.3.16,!=0.3.17,!=0.3.18,!=0.3.19,!=0.3.20,!=0.3.21,!=0.3.22"
+langgraph = ">=0.3,<0.4"
+langgraph-checkpoint = "^2.0.10"
+
+[package.source]
+type = "directory"
+url = "../prebuilt"
+
 [[package]]
 name = "langgraph-sdk"
-version = "0.1.51"
+version = "0.1.53"
 description = "SDK for interacting with LangGraph API"
 optional = false
 python-versions = "^3.9.0,<4.0"
@@ -3491,4 +3510,4 @@ type = ["pytest-mypy"]
 [metadata]
 lock-version = "2.1"
 python-versions = ">=3.9.0,<4.0"
-content-hash = "caf943b02b6913c05d15c37fda6d216669f789e2a059b7e8e2490b2bdcd23e0e"
+content-hash = "967adb1fe0f48b76a53b79c8604768b2ce74042f88d1791f57ea1ed0a0ede0ad"

libs/langgraph/pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "langgraph"
-version = "0.2.73"
+version = "0.3.0"
 description = "Building stateful, multi-actor applications with LLMs"
 authors = []
 license = "MIT"
@@ -9,7 +9,7 @@ repository = "https://www.github.com/langchain-ai/langgraph"
 
 [tool.poetry.dependencies]
 python = ">=3.9.0,<4.0"
-langchain-core = ">=0.2.43,<0.4.0,!=0.3.0,!=0.3.1,!=0.3.2,!=0.3.3,!=0.3.4,!=0.3.5,!=0.3.6,!=0.3.7,!=0.3.8,!=0.3.9,!=0.3.10,!=0.3.11,!=0.3.12,!=0.3.13,!=0.3.14,!=0.3.15,!=0.3.16,!=0.3.17,!=0.3.18,!=0.3.19,!=0.3.20,!=0.3.21,!=0.3.22"
+langchain-core = ">=0.1,<0.4"
 langgraph-checkpoint = "^2.0.10"
 langgraph-sdk = "^0.1.42"
 
@@ -26,6 +26,7 @@ ruff = "^0.6.2"
 jupyter = "^1.0.0"
 pytest-xdist = {extras = ["psutil"], version = "^3.6.1"}
 pytest-repeat = "^0.9.3"
+langgraph-prebuilt = {path = "../prebuilt", develop = true}
 langgraph-checkpoint = {path = "../checkpoint", develop = true}
 langgraph-checkpoint-sqlite = {path = "../checkpoint-sqlite", develop = true}
 langgraph-checkpoint-postgres = {path = "../checkpoint-postgres", develop = true}