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Author SHA1 Message Date
Sam Crowder 7b5e81e086 Update changelog via LangGraph Server Changelog Bot 2025-07-14 13:32:34 -07:00
198 changed files with 6147 additions and 7489 deletions
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@@ -1,29 +1,29 @@
name: "\U0001F41B Bug Report"
description: Report a bug in LangGraph. To report a security issue, please instead use the security option below. For questions, please use the LangChain Forum at forum.langchain.com.
description: Report a bug in LangGraph. To report a security issue, please instead use the security option below. For questions, please use the GitHub Discussions.
labels: [pending,bug]
body:
- type: markdown
attributes:
value: |
value: >
Thank you for taking the time to file a bug report.
Use this to report BUGS in LangGraph. For usage questions, feature requests and general design questions, please use the [LangChain Forum](https://forum.langchain.com/).
Use this to report BUGS in LangGraph. For usage questions, feature requests and general design questions, please use [GitHub Discussions](https://github.com/langchain-ai/langgraph/discussions).
Relevant links to check before filing a bug report to see if your issue has already been reported, fixed or
if there's another way to solve your problem:
* [LangChain Forum](https://forum.langchain.com/),
* [LangGraph Github Issues](https://github.com/langchain-ai/langgraph/issues),
* [LangGraph how-to guides](https://langchain-ai.github.io/langgraph/how-tos/).
* [LangChain documentation with the integrated search](https://python.langchain.com/docs/get_started/introduction),
* [GitHub search](https://github.com/langchain-ai/langgraph),
[LangGraph Github Discussions](https://github.com/langchain-ai/langgraph/discussions),
[LangGraph Github Issues](https://github.com/langchain-ai/langgraph/issues),
[LangGraph how-to guides](https://langchain-ai.github.io/langgraph/how-tos/).
[LangChain documentation with the integrated search](https://python.langchain.com/docs/get_started/introduction),
[GitHub search](https://github.com/langchain-ai/langgraph),
- type: checkboxes
id: checks
attributes:
label: Checked other resources
description: Before submitting this issue, please confirm that you have completed all the steps below by checking each option. These steps help ensure your issue is well-defined, relevant, and actionable.
options:
- label: This is a bug, not a usage question. For questions, please use the LangChain Forum (https://forum.langchain.com/).
- label: This is a bug, not a usage question. For questions, please use GitHub Discussions.
required: true
- label: I added a clear and detailed title that summarizes the issue.
required: true
@@ -38,7 +38,7 @@ body:
attributes:
label: Example Code
description: |
Please add a self-contained, [minimal, reproducible, example](https://stackoverflow.com/help/minimal-reproducible-example) with your use case. Replace this code with your own!
Please add a self-contained, [minimal, reproducible, example](https://stackoverflow.com/help/minimal-reproducible-example) with your use case.
placeholder: |
from langgraph.graph import StateGraph
@@ -78,7 +78,7 @@ body:
attributes:
label: System Info
description: |
Run on your machine: `python -m langchain_core.sys_info`
python -m langchain_core.sys_info
placeholder: |
python -m langchain_core.sys_info
validations:
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@@ -1,6 +1,8 @@
blank_issues_enabled: false
version: 2.1
contact_links:
- name: Feature Request
url: https://github.com/langchain-ai/langgraph/discussions/categories/ideas
about: Suggest a feature or an idea
- name: LangChain Forum
url: https://forum.langchain.com/
about: General community discussions, support, and feature requests
about: General community discussions and support
+8 -12
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@@ -1,29 +1,25 @@
name: 🔒 Privileged
description: You are a LangGraph maintainer, or was asked directly by a maintainer to create an issue here. If not, check the other options.
description: You are a LangChain maintainer, or was asked directly by a maintainer to create an issue here. If not, check the other options.
body:
- type: markdown
attributes:
value: |
Thanks for your interest in LangGraph! 🚀
If you are not a LangGraph maintainer or were not asked directly by a maintainer to create an issue, then please start the conversation on the [LangChain Forum](https://forum.langchain.com/) instead.
You are a LangGraph maintainer if you maintain any of the packages inside of the LangGraph repository
or are a regular contributor to LangGraph with previous merged merged pull requests.
Thanks for your interest in LangChain! 🚀
If you are not a LangChain maintainer or were not asked directly by a maintainer to create an issue, then please start the conversation in a [Question in GitHub Discussions](https://github.com/langchain-ai/langchain/discussions/categories/q-a) instead.
You are a LangChain maintainer if you maintain any of the packages inside of the LangChain repository
or are a regular contributor to LangChain with previous merged merged pull requests.
- type: checkboxes
id: privileged
attributes:
label: Privileged issue
description: Confirm that you are allowed to create an issue here.
options:
- label: I am a LangGraph maintainer, or was asked directly by a LangGraph maintainer to create an issue here.
- label: I am a LangChain maintainer, or was asked directly by a LangChain maintainer to create an issue here.
required: true
- type: textarea
id: content
attributes:
label: Issue Content
description: Add the content of the issue here.
- type: markdown
attributes:
value: |
Community members should **NOT** work on Privileged issues unless these issues have been explicitly marked with a "help-wanted" tag.
-31
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@@ -1,31 +0,0 @@
Thank you for contributing to LangGraph! Follow these steps to mark your pull request as ready for review. **If any of these steps are not completed, your PR will not be considered for review.**
- [ ] **PR title**: Follows the format: {TYPE}({SCOPE}): {DESCRIPTION}
- Examples:
- feat(core): add multi-tenant support
- fix(cli): resolve flag parsing error
- docs(openai): update API usage examples
- Allowed `{TYPE}` values:
- feat, fix, docs, style, refactor, perf, test, build, ci, chore, revert, release
- Allowed `{SCOPE}` values (optional):
- langgraph, docs, cli, checkpoint, checkpoint-postgres, checkpoint-sqlite, prebuilt, scheduler-kafka, sdk-py
- Once you've written the title, please delete this checklist item; do not include it in the PR.
- [ ] **PR message**: ***Delete this entire checklist*** and replace with
- **Description:** a description of the change. Include a [closing keyword](https://docs.github.com/en/issues/tracking-your-work-with-issues/using-issues/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword) if applicable.
- **Issue:** the issue # it fixes, if applicable
- **Dependencies:** any dependencies required for this change
- **Twitter handle:** if your PR gets announced, and you'd like a mention, we'll gladly shout you out!
- [ ] **Add tests and docs**: If you're adding a new integration, you must include:
1. A test for the integration, preferably unit tests that do not rely on network access,
2. An example notebook showing its use. It lives in `docs/docs/integrations` directory.
- [ ] **Lint and test**: Run `make format`, `make lint` and `make test` from the root of the package(s) you've modified. We will not consider a PR unless these three are passing in CI. See [contribution guidelines](https://github.com/langchain-ai/langgraph/blob/main/CONTRIBUTING.md) for more.
Additional guidelines:
- Make sure optional dependencies are imported within a function.
- Please do not add dependencies to `pyproject.toml` files (even optional ones) unless they are **required** for unit tests.
- Most PRs should not touch more than one package.
- Changes should be backwards compatible.
+1 -1
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@@ -3,7 +3,7 @@ name: CI
on:
push:
branches: [main, v1]
branches: [main]
pull_request:
permissions:
@@ -1,11 +0,0 @@
LangChain
LangGraph
LangSmith
thead
stdio
nd
jupyter
lets
lite
uis
deque
+3 -9
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@@ -34,16 +34,10 @@
id: extract_ignore_words
- name: Codespell
uses: codespell-project/actions-codespell@v2.1
uses: codespell-project/actions-codespell@v2
with:
skip: '*.ambr,*.lock,*.ipynb,*.yaml,*.zlib,*.css.map,*.js.map'
skip: '*.ambr,*.lock,*.ipynb,*.yaml,*.zlib,*.md'
ignore_words_list: ${{ steps.extract_ignore_words.outputs.ignore_words_list }}
# We do this to avoid spellchecking cell outputs
- name: Codespell Notebooks
run: make codespell
- name: Codespell LangGraph Library
run: |
# Change to root directory to check the main LangGraph library
cd ..
codespell --skip="*.ambr,*.lock,*.ipynb,*.yaml,*.zlib,*.css.map,*.js.map,*.pyc,__pycache__/*" --ignore-words-list="${{ steps.extract_ignore_words.outputs.ignore_words_list }}" libs/langgraph/langgraph/
run: make codespell
+9 -8
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@@ -9,7 +9,7 @@ Here are some things to keep in mind for all types of contributions:
- Follow the ["fork and pull request"](https://docs.github.com/en/get-started/exploring-projects-on-github/contributing-to-a-project) workflow.
- Fill out the checked-in pull request template when opening pull requests. Note related issues and tag relevant maintainers.
- Ensure your PR passes formatting, linting, and testing checks before requesting a review.
- If you would like comments or feedback, please tag a maintainer.
- If you would like comments or feedback, please open an issue or discussion and tag a maintainer.
- Backwards compatibility is key. Your changes must not be breaking, except in case of critical bug and security fixes.
- Look for duplicate PRs or issues that have already been opened before opening a new one.
- Keep scope as isolated as possible. As a general rule, your changes should not affect more than one package at a time.
@@ -20,7 +20,7 @@ For bug fixes, please open up an issue before proposing a fix to ensure the prop
### New features
For new features, please start a new [discussion](https://forum.langchain.com/), where the maintainers will help with scoping out the necessary changes.
For new features, please start a new [discussion](https://github.com/langchain-ai/langgraph/discussions), where the maintainers will help with scoping out the necessary changes.
## Contribute Documentation
@@ -111,6 +111,7 @@ in a more abstract way than how-to guides or tutorials, and should be geared tow
gaining a deeper understanding of the framework. Try to avoid excessively large code examples. The goal here is to
impart perspective to the user rather than to finish a practical project. These guides should cover **why** things work the way they do.
To quote the Diataxis website:
> The perspective of explanation is higher and wider than that of the other types. It does not take the users eye-level view, as in a how-to guide, or a close-up view of the machinery, like reference material. Its scope in each case is a topic - “an area of knowledge”, that somehow has to be bounded in a reasonable, meaningful way.
@@ -186,9 +187,9 @@ Be concise, including in code samples.
## Setup
LangGraph documentation consists of two components:
LangChain documentation consists of two components:
1. Main Documentation: Hosted at [https://langchain-ai.github.io/langgraph/](https://langchain-ai.github.io/langgraph/),
1. Main Documentation: Hosted at [https://langchain-ai.github.io](https://langchain-ai.github.io/langgraph/),
this comprehensive resource serves as the primary user-facing documentation.
It covers a wide array of topics, including tutorials, use cases, integrations,
and more, offering extensive guidance on building with LangGraph.
@@ -249,17 +250,17 @@ make serve-docs
#### Linting
To spell check the docs, run the following from the `docs` directory:
The documentation is linted from the **monorepo root**. To lint it, run the following from there:
```bash
codespell --skip="*.ambr,*.lock,*.ipynb,*.yaml,*.zlib,*.css.map,*.js.map" --ignore-words-list="infor,thead,stdio,nd,jupyter,lets,lite,uis,deque" .
make spellcheck
```
### In-code Documentation
The in-code documentation is autogenerated from docstrings.
For the API reference to be useful, the codebase must be well-documented. This means that all functions, classes, and methods should have a docstring that explains what they do, what the arguments are, and what the return value is. This is a good practice in general, but it is especially important for LangGraph because the API reference is the primary resource for developers to understand how to use the codebase.
For the API reference to be useful, the codebase must be well-documented. This means that all functions, classes, and methods should have a docstring that explains what they do, what the arguments are, and what the return value is. This is a good practice in general, but it is especially important for LangChain because the API reference is the primary resource for developers to understand how to use the codebase.
We generally follow the [Google Python Style Guide](https://google.github.io/styleguide/pyguide.html#38-comments-and-docstrings) for docstrings.
@@ -290,4 +291,4 @@ def my_function(arg1: int, arg2: str) -> float:
This is a description of the return value.
"""
return 3.14
```
```
+2 -2
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@@ -73,7 +73,7 @@ While LangGraph can be used standalone, it also integrates seamlessly with any L
- [Guides](https://langchain-ai.github.io/langgraph/how-tos/): Quick, actionable code snippets for topics such as streaming, adding memory & persistence, and design patterns (e.g. branching, subgraphs, etc.).
- [Reference](https://langchain-ai.github.io/langgraph/reference/graphs/): Detailed reference on core classes, methods, how to use the graph and checkpointing APIs, and higher-level prebuilt components.
- [Examples](https://langchain-ai.github.io/langgraph/examples/): Guided examples on getting started with LangGraph.
- [Examples](https://langchain-ai.github.io/langgraph/tutorials/overview/): Guided examples on getting started with LangGraph.
- [LangChain Forum](https://forum.langchain.com/): Connect with the community and share all of your technical questions, ideas, and feedback.
- [LangChain Academy](https://academy.langchain.com/courses/intro-to-langgraph): Learn the basics of LangGraph in our free, structured course.
- [Templates](https://langchain-ai.github.io/langgraph/concepts/template_applications/): Pre-built reference apps for common agentic workflows (e.g. ReAct agent, memory, retrieval etc.) that can be cloned and adapted.
@@ -81,4 +81,4 @@ While LangGraph can be used standalone, it also integrates seamlessly with any L
## Acknowledgements
LangGraph is inspired by [Pregel](https://research.google/pubs/pub37252/) and [Apache Beam](https://beam.apache.org/). The public interface draws inspiration from [NetworkX](https://networkx.org/documentation/latest/). LangGraph is built by LangChain Inc, the creators of LangChain, but can be used without LangChain.
LangGraph is inspired by [Pregel](https://research.google/pubs/pub37252/) and [Apache Beam](https://beam.apache.org/). The public interface draws inspiration from [NetworkX](https://networkx.org/documentation/latest/). LangGraph is built by LangChain Inc, the creators of LangChain, but can be used without LangChain.
+22 -32
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@@ -12,64 +12,56 @@ LangGraph provides **three** primary ways to supply context:
| Type | Description | Mutable? | Lifetime |
|------------------------------------------------------------------------------|-----------------------------------------------|----------|-------------------------|
| [**Runtime Context**](#runtime-context) | data passed at the start of a run | ❌ | per run |
| [**Config**](#config-static-context) | data passed at the start of a run | ❌ | per run |
| [**Short-term memory (State)**](#short-term-memory-mutable-context) | dynamic data that can change during execution | ✅ | per run or conversation |
| [**Long-term memory (Store)**](#long-term-memory-cross-conversation-context) | data that can be shared between conversations | ✅ | across conversations |
### Runtime Context
## Provide runtime context
!!! note "`config['configurable']` -> `runtime.context`"
### Config (static context)
In LangGraph < v1.0, static runtime context was passed via the `config['configurable']` key, paired with a `config_schema` argument
to `StateGraph` or `Pregel`. This is now deprecated and will be removed in v2.0.
Config is for immutable data like user metadata or API keys. Use
when you have values that don't change mid-run.
As of LangGraph v1.0, the Runtime object is recommended to access static context and runtime-specific information like the store and stream writer.
Runtime context is for immutable data like user metadata or API keys. Use this when you have values that don't change mid-run.
Specify static context via the `context` argument to `invoke` / `stream`, which is reserved for this purpose:
Specify configuration using a key called **"configurable"** which is reserved
for this purpose:
```python
@dataclass
class ContextSchema:
user_name: str
graph.invoke( # (1)!
{"messages": [{"role": "user", "content": "hi!"}]}, # (2)!
# highlight-next-line
context={"user_name": "John Smith"} # (3)!
config={"configurable": {"user_id": "user_123"}} # (3)!
)
```
1. This is the invocation of the agent or graph. The `invoke` method runs the underlying graph with the provided input.
2. This example uses messages as an input, which is common, but your application may use different input structures.
3. This is where you pass the runtime data. The `context` parameter allows you to provide additional dependencies that the agent can use during its execution.
3. This is where you pass the configuration data. The `config` parameter allows you to provide additional context that the agent can use during its execution.
=== "Agent prompt"
```python
from langchain_core.messages import AnyMessage
from langgraph.runtime import get_runtime
from langchain_core.runnables import RunnableConfig
from langgraph.prebuilt.chat_agent_executor import AgentState
from langgraph.prebuilt import create_react_agent
# highlight-next-line
def prompt(state: AgentState) -> list[AnyMessage]:
runtime = get_runtime(ContextSchema)
system_msg = f"You are a helpful assistant. Address the user as {runtime.context.user_name}."
def prompt(state: AgentState, config: RunnableConfig) -> list[AnyMessage]:
user_name = config["configurable"].get("user_name")
system_msg = f"You are a helpful assistant. Address the user as {user_name}."
return [{"role": "system", "content": system_msg}] + state["messages"]
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[get_weather],
prompt=prompt,
context_schema=ContextSchema
prompt=prompt
)
agent.invoke(
{"messages": [{"role": "user", "content": "what is the weather in sf"}]},
# highlight-next-line
context={"user_name": "John Smith"}
config={"configurable": {"user_name": "John Smith"}}
)
```
@@ -78,11 +70,11 @@ graph.invoke( # (1)!
=== "Workflow node"
```python
from langgraph.runtime import Runtime
from langchain_core.runnables import RunnableConfig
# highlight-next-line
def node(state: State, config: Runtime[ContextSchema]):
user_name = runtime.context.user_name
def node(state: State, config: RunnableConfig):
user_name = config["configurable"].get("user_name")
...
```
@@ -91,16 +83,14 @@ graph.invoke( # (1)!
=== "In a tool"
```python
from langgraph.runtime import get_runtime
from langchain_core.runnables import RunnableConfig
@tool
# highlight-next-line
def get_user_email() -> str:
def get_user_info(config: RunnableConfig) -> str:
"""Retrieve user information based on user ID."""
# simulate fetching user info from a database
runtime = get_runtime(ContextSchema)
email = get_user_email_from_db(runtime.context.user_name)
return email
user_id = config["configurable"].get("user_id")
return "User is John Smith" if user_id == "user_123" else "Unknown user"
```
See the [tool calling guide](../how-tos/tool-calling.md#configuration) for details.
+14 -41
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@@ -55,16 +55,14 @@ The `langchain-mcp-adapters` package enables agents to use tools defined across
=== "In a workflow"
```python title="Workflow using MCP tools with ToolNode"
```python
from langchain_mcp_adapters.client import MultiServerMCPClient
from langgraph.graph import StateGraph, MessagesState, START
from langgraph.prebuilt import ToolNode, tools_condition
from langchain.chat_models import init_chat_model
from langgraph.graph import StateGraph, MessagesState, START, END
from langgraph.prebuilt import ToolNode
model = init_chat_model("openai:gpt-4.1")
# Initialize the model
model = init_chat_model("anthropic:claude-3-5-sonnet-latest")
# Set up MCP client
client = MultiServerMCPClient(
{
"math": {
@@ -82,47 +80,22 @@ The `langchain-mcp-adapters` package enables agents to use tools defined across
)
tools = await client.get_tools()
# Bind tools to model
model_with_tools = model.bind_tools(tools)
def call_model(state: MessagesState):
response = model.bind_tools(tools).invoke(state["messages"])
return {"messages": response}
# Create ToolNode
tool_node = ToolNode(tools)
def should_continue(state: MessagesState):
messages = state["messages"]
last_message = messages[-1]
if last_message.tool_calls:
return "tools"
return END
# Define call_model function
async def call_model(state: MessagesState):
messages = state["messages"]
response = await model_with_tools.ainvoke(messages)
return {"messages": [response]}
# Build the graph
builder = StateGraph(MessagesState)
builder.add_node("call_model", call_model)
builder.add_node("tools", tool_node)
builder.add_node(call_model)
builder.add_node(ToolNode(tools))
builder.add_edge(START, "call_model")
builder.add_conditional_edges(
"call_model",
should_continue,
tools_condition,
)
builder.add_edge("tools", "call_model")
# Compile the graph
graph = builder.compile()
# Test the graph
math_response = await graph.ainvoke(
{"messages": [{"role": "user", "content": "what's (3 + 5) x 12?"}]}
)
weather_response = await graph.ainvoke(
{"messages": [{"role": "user", "content": "what is the weather in nyc?"}]}
)
math_response = await graph.ainvoke({"messages": "what's (3 + 5) x 12?"})
weather_response = await graph.ainvoke({"messages": "what is the weather in nyc?"})
```
@@ -175,4 +148,4 @@ if __name__ == "__main__":
- [MCP documentation](https://modelcontextprotocol.io/introduction)
- [MCP Transport documentation](https://modelcontextprotocol.io/docs/concepts/transports)
- [langchain_mcp_adapters](https://github.com/langchain-ai/langchain-mcp-adapters)
- [langchain_mcp_adapters](https://github.com/langchain-ai/langchain-mcp-adapters)
-119
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@@ -1,119 +0,0 @@
# Egress for Subscription Metrics and Operational Metadata
> **Important: Self Hosted Only**
> This section only applies to customers who are not running in offline mode and assumes you are using a self-hosted LangGraph Platform instance.
> This does not apply to SaaS or Hybrid deployments.
Self-Hosted LangGraph Platform instances store all information locally and will never send sensitive information outside of your network. We currently only track platform usage for billing purposes according to the entitlements in your order. In order to better remotely support our customers, we do require egress to `https://beacon.langchain.com`.
In the future, we will be introducing support diagnostics to help us ensure that the LangGraph Platform is running at an optimal level within your environment.
> **Warning**
> **This will require egress to `https://beacon.langchain.com` from your network.**
> **If using an API key, you will also need to allow egress to `https://api.smith.langchain.com` or `https://eu.api.smith.langchain.com` for API key verification.**
Generally, data that we send to Beacon can be categorized as follows:
- **Subscription Metrics**
- Subscription metrics are used to determine level of access and utilization of LangSmith. This includes, but are not limited to:
- Nodes Executed
- Runs Executed
- License Key Verification
- **Operational Metadata**
- This metadata will contain and collect the above subscription metrics to assist with remote support, allowing the LangChain team to diagnose and troubleshoot performance issues more effectively and proactively.
## Example Payloads
In an effort to maximize transparency, we provide sample payloads here:
### License Verification (If using an Enterprise License)
**Endpoint:**
`POST beacon.langchain.com/v1/beacon/verify`
**Request:**
```json
{
"license": "<YOUR_LICENSE_KEY>"
}
```
**Response:**
```json
{
"token": "Valid JWT" // Short-lived JWT token to avoid repeated license checks
}
```
### Api Key Verification (If using a LangSmith API Key)
**Endpoint:**
`POST api.smith.langchain.com/auth`
**Request:**
```json
"Headers": {
X-Api-Key: <YOUR_API_KEY>
}
```
**Response:**
```json
{
"org_config": {
"org_id": "3a1c2b6f-4430-4b92-8a5b-79b8b567bbc1",
... // Additional organization details
}
}
```
### Usage Reporting
**Endpoint:**
`POST beacon.langchain.com/v1/metadata/submit`
**Request:**
```json
{
"license": "<YOUR_LICENSE_KEY>",
"from_timestamp": "2025-01-06T09:00:00Z",
"to_timestamp": "2025-01-06T10:00:00Z",
"tags": {
"langgraph.python.version": "0.1.0",
"langgraph_api.version": "0.2.0",
"langgraph.platform.revision": "abc123",
"langgraph.platform.variant": "standard",
"langgraph.platform.host": "host-1",
"langgraph.platform.tenant_id": "3a1c2b6f-4430-4b92-8a5b-79b8b567bbc1",
"langgraph.platform.project_id": "c5b5f53a-4716-4326-8967-d4f7f7799735",
"langgraph.platform.plan": "enterprise",
"user_app.uses_indexing": "true",
"user_app.uses_custom_app": "false",
"user_app.uses_custom_auth": "true",
"user_app.uses_thread_ttl": "true",
"user_app.uses_store_ttl": "false"
},
"measures": {
"langgraph.platform.runs": 150,
"langgraph.platform.nodes": 450
},
"logs": []
}
```
**Response:**
```json
"204 No Content"
```
## Our Commitment
LangChain will not store any sensitive information in the Subscription Metrics or Operational Metadata. Any data collected will not be shared with a third party. If you have any concerns about the data being sent, please reach out to your account team.
@@ -23,8 +23,6 @@ Before deploying, review the [conceptual guide for the Self-Hosted Control Plane
kubectl get storageclass
1. Egress to `https://beacon.langchain.com` from your network. This is required for license verification and usage reporting if not running in air-gapped mode. See the [Egress documentation](../../cloud/deployment/egress.md) for more details.
## Setup
1. As part of configuring your Self-Hosted LangSmith instance, you enable the `langgraphPlatform` option. This will provision a few key resources.
+3 -3
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@@ -108,11 +108,11 @@ from langgraph.graph import StateGraph, END, START
from my_agent.utils.nodes import call_model, should_continue, tool_node # import nodes
from my_agent.utils.state import AgentState # import state
# Define the runtime context
class GraphContext(TypedDict):
# Define the config
class GraphConfig(TypedDict):
model_name: Literal["anthropic", "openai"]
workflow = StateGraph(AgentState, context_schema=GraphContext)
workflow = StateGraph(AgentState, config_schema=GraphConfig)
workflow.add_node("agent", call_model)
workflow.add_node("action", tool_node)
workflow.add_edge(START, "agent")
@@ -121,11 +121,11 @@ from langgraph.graph import StateGraph, END, START
from my_agent.utils.nodes import call_model, should_continue, tool_node # import nodes
from my_agent.utils.state import AgentState # import state
# Define the runtime context
class GraphContext(TypedDict):
# Define the config
class GraphConfig(TypedDict):
model_name: Literal["anthropic", "openai"]
workflow = StateGraph(AgentState, context_schema=GraphContext)
workflow = StateGraph(AgentState, config_schema=GraphConfig)
workflow.add_node("agent", call_model)
workflow.add_node("action", tool_node)
workflow.add_edge(START, "agent")
@@ -24,7 +24,6 @@ Before deploying, review the [conceptual guide for the Standalone Container](../
1. `LANGSMITH_API_KEY`: (if using [Lite](../../concepts/langgraph_server.md#server-versions)) LangSmith API key. This will be used to authenticate ONCE at server start up.
1. `LANGGRAPH_CLOUD_LICENSE_KEY`: (if using [Enterprise](../../concepts/langgraph_data_plane.md#licensing)) LangGraph Platform license key. This will be used to authenticate ONCE at server start up.
1. `LANGSMITH_ENDPOINT`: To send traces to a [self-hosted LangSmith](https://docs.smith.langchain.com/self_hosting) instance, set `LANGSMITH_ENDPOINT` to the hostname of the self-hosted LangSmith instance.
1. Egress to `https://beacon.langchain.com` from your network. This is required for license verification and usage reporting if not running in air-gapped mode. See the [Egress documentation](../../cloud/deployment/egress.md) for more details.
## Kubernetes (Helm)
@@ -30,7 +30,9 @@ To review, edit, and approve tool calls in an agent or workflow, use LangGraph's
# > [
# > {
# > 'value': {'text_to_revise': 'original text'},
# > 'id': '...',
# > 'resumable': True,
# > 'ns': ['human_node:fc722478-2f21-0578-c572-d9fc4dd07c3b'],
# > 'when': 'during'
# > }
# > ]
@@ -201,7 +203,9 @@ To review, edit, and approve tool calls in an agent or workflow, use LangGraph's
# > [
# > {
# > 'value': {'text_to_revise': 'original text'},
# > 'id': '...',
# > 'resumable': True,
# > 'ns': ['human_node:fc722478-2f21-0578-c572-d9fc4dd07c3b'],
# > 'when': 'during'
# > }
# > ]
@@ -2,20 +2,21 @@
In this guide we will show how to create, configure, and manage an [assistant](../../concepts/assistants.md).
First, as a brief refresher on the concept of runtime context, consider the following simple `call_model` node and context schema. Observe that this node tries to read and use the `model_provider` as defined by the `Runtime` object's `context` property.
First, as a brief refresher on the concept of configurations, consider the following simple `call_model` node and configuration schema. Observe that this node tries to read and use the `model_name` as defined by the `config` object's `configurable`.
=== "Python"
```python
@dataclass
class ContextSchema:
llm_provider: str = "anthropic"
builder = StateGraph(AgentState, context_schema=ContextSchema)
class ConfigSchema(TypedDict):
model_name: str
def call_model(state, runtime: Runtime[ContextSchema]):
builder = StateGraph(AgentState, config_schema=ConfigSchema)
def call_model(state, config):
messages = state["messages"]
model = _get_model(runtime.context.llm_provider)
model_name = config.get('configurable', {}).get("model_name", "anthropic")
model = _get_model(model_name)
response = model.invoke(messages)
# We return a list, because this will get added to the existing list
return {"messages": [response]}
@@ -43,7 +44,7 @@ First, as a brief refresher on the concept of runtime context, consider the foll
}
```
For more information on runtime context, [see here](../../concepts/low_level.md#runtime-context).
For more information on configurations, [see here](../../concepts/low_level.md#configuration).
## Create an assistant
+11 -27
View File
@@ -30,33 +30,17 @@ export default {
Next, define your UI components in your `langgraph.json` configuration:
=== "Python agent"
```json title="langgraph.json"
{
"node_version": "20",
"graphs": {
"agent": "./src/agent.py:graph"
},
"ui": {
"agent": "./src/agent/ui.tsx"
}
}
```
=== "JS agent"
```json title="langgraph.json"
{
"node_version": "20",
"graphs": {
"agent": "./src/agent/index.ts:graph"
},
"ui": {
"agent": "./src/agent/ui.tsx"
}
}
```
```json
{
"node_version": "20",
"graphs": {
"agent": "./src/agent/index.ts:graph"
},
"ui": {
"agent": "./src/agent/ui.tsx"
}
}
```
The `ui` section points to the UI components that will be used by graphs. By default, we recommend using the same key as the graph name, but you can split out the components however you like, see [Customise the namespace of UI components](#customise-the-namespace-of-ui-components) for more details.
-16
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@@ -140,22 +140,6 @@ https://my-server.app/my-webhook-endpoint?token=YOUR_SECRET_TOKEN
Your server should extract and validate this token before processing requests.
## Disable webhooks
As of `langgraph-api>=0.2.78`, developers can disable webhooks in the `langgraph.json` file:
```json
{
"http": {
"disable_webhooks": true
}
}
```
This feature is primarily intended for self-hosted deployments, where platform administrators or developers may prefer to disable webhooks to simplify their security posture—especially if they are not configuring firewall rules or other network controls. Disabling webhooks helps prevent untrusted payloads from being sent to internal endpoints.
For full configuration details, refer to the [configuration file reference](https://langchain-ai.github.io/langgraph/cloud/reference/cli/?h=disable_webhooks#configuration-file).
## Test webhooks
You can test your webhook using online services like:
+4 -4
View File
@@ -409,8 +409,8 @@ The LangGraph CLI requires a JSON configuration file that follows this [schema](
| Option | Default | Description |
| ---------------------------- | ------------------------- | ----------------------------------------------------------------------------------------------------------------------- |
| `--wait` | | Wait for services to start before returning. Implies --detach |
| `--base-image TEXT` | `langchain/langgraph-api` | Base image to use for the LangGraph API server. Pin to specific versions using version tags. |
| `--image TEXT` | | Docker image to use for the langgraph-api service. If specified, skips building and uses this image directly. |
| `--base-image TEXT` | `langchain/langgraph-api` | Base image to use for the LangGraph API server. Pin to specific versions using version tags. |
| `--image TEXT` | | Docker image to use for the langgraph-api service. If specified, skips building and uses this image directly. |
| `--postgres-uri TEXT` | Local database | Postgres URI to use for the database. |
| `--watch` | | Restart on file changes |
| `--debugger-base-url TEXT` | `http://127.0.0.1:[PORT]` | URL used by the debugger to access LangGraph API. |
@@ -438,8 +438,8 @@ The LangGraph CLI requires a JSON configuration file that follows this [schema](
| Option | Default | Description |
| ---------------------------------------------------------------------- | ------------------------- | ----------------------------------------------------------------------------------------------------------------------- |
| <span style="white-space: nowrap;">`--wait`</span> | | Wait for services to start before returning. Implies --detach |
| <span style="white-space: nowrap;">`--base-image TEXT`</span> | <span style="white-space: nowrap;">`langchain/langgraph-api`</span> | Base image to use for the LangGraph API server. Pin to specific versions using version tags. |
| <span style="white-space: nowrap;">`--image TEXT`</span> | | Docker image to use for the langgraph-api service. If specified, skips building and uses this image directly. |
| <span style="white-space: nowrap;">`--base-image TEXT`</span> | <span style="white-space: nowrap;">`langchain/langgraph-api`</span> | Base image to use for the LangGraph API server. Pin to specific versions using version tags. |
| <span style="white-space: nowrap;">`--image TEXT`</span> | | Docker image to use for the langgraph-api service. If specified, skips building and uses this image directly. |
| <span style="white-space: nowrap;">`--postgres-uri TEXT`</span> | Local database | Postgres URI to use for the database. |
| <span style="white-space: nowrap;">`--watch`</span> | | Restart on file changes |
| <span style="white-space: nowrap;">`-c, --config FILE`</span> | `langgraph.json` | Path to configuration file declaring dependencies, graphs and environment variables. |
-3
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@@ -28,9 +28,6 @@ Specify `DD_API_KEY` (your [Datadog API Key](https://docs.datadoghq.com/account_
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.
!!! note
Enabling `DD_API_KEY` (and thus `ddtrace-run`) can override or interfere with other auto-instrumentation solutions (such as OpenTelemetry) that you may have instrumented into your application code.
## `LANGCHAIN_TRACING_SAMPLING_RATE`
Sampling rate for traces sent to LangSmith. Valid values: Any float between `0` and `1`.
@@ -4,38 +4,8 @@
---
## v0.2.96 (2025-07-17)
- Added a fallback mechanism for configurable header patterns to handle exclude/include settings more effectively.
## v0.2.95 (2025-07-17)
- Avoided setting the future if it is already done to prevent redundant operations.
- Resolved compatibility errors in CI by switching from `typing.TypedDict` to `typing_extensions.TypedDict` for Python versions below 3.12.
## v0.2.94 (2025-07-16)
- Improved performance by omitting pending sends for langgraph versions 0.5 and above.
- Improved server startup logs to provide clearer warnings when the DD_API_KEY environment variable is set.
## v0.2.93 (2025-07-16)
- Removed the GIN index for run metadata to improve performance.
## v0.2.92 (2025-07-16)
- Enabled copying functionality for blobs and checkpoints, improving data management flexibility.
## v0.2.91 (2025-07-16)
- Reduced writes to the `checkpoint_blobs` table by inlining small values (null, numeric, str, etc.). This means we don't need to store extra values for channels that haven't been updated.
## v0.2.90 (2025-07-16)
- Improve checkpoint writes via node-local background queueing.
## v0.2.89 (2025-07-15)
- Decoupled checkpoint writing from thread/run state by removing foreign keys and updated logger to prevent timeout-related failures.
## v0.2.88 (2025-07-14)
- Removed the foreign key constraint for `thread` in the `run` table to simplify database schema.
## v0.2.87 (2025-07-14)
- Added more detailed logs for Redis worker signaling to improve debugging.
- Enhanced logging for Redis worker signaling to provide more helpful insights into worker activities.
## v0.2.86 (2025-07-11)
- Honored tool descriptions in the `/mcp` endpoint to align with expected functionality.
+4 -4
View File
@@ -1,6 +1,6 @@
# Assistants
**Assistants** allow you to manage configurations (like prompts, LLM selection, tools) separately from your graph's core logic, enabling rapid changes that don't alter the graph architecture. It is a way to create multiple specialized versions of the same graph architecture, each optimized for different use cases through context/configuration variations rather than structural changes.
**Assistants** allow you to manage configurations (like prompts, LLM selection, tools) separately from your graph's core logic, enabling rapid changes that don't alter the graph architecture. It is a way to create multiple specialized versions of the same graph architecture, each optimized for different use cases through configuration variations rather than structural changes.
For example, imagine a general-purpose writing agent built on a common graph architecture. While the structure remains the same, different writing styles—such as blog posts and tweets—require tailored configurations to optimize performance. To support these variations, you can create multiple assistants (e.g., one for blogs and another for tweets) that share the underlying graph but differ in model selection and system prompt.
@@ -14,8 +14,8 @@ The LangGraph Cloud API provides several endpoints for creating and managing ass
## Configuration
Assistants build on the LangGraph open source concepts of configuration and [runtime context](low_level.md#runtime-context).
While these features are available in the open source LangGraph library, assistants are only present in [LangGraph Platform](langgraph_platform.md). This is due to the fact that assistants are tightly coupled to your deployed graph. Upon deployment, LangGraph Server will automatically create a default assistant for each graph using the graph's default context and configuration settings.
Assistants build on the LangGraph open source concept of [configuration](low_level.md#configuration).
While configuration is available in the open source LangGraph library, assistants are only present in [LangGraph Platform](langgraph_platform.md). This is due to the fact that assistants are tightly coupled to your deployed graph. Upon deployment, LangGraph Server will automatically create a default assistant for each graph using the graph's default configuration settings.
In practice, an assistant is just an _instance_ of a graph with a specific configuration. Therefore, multiple assistants can reference the same graph but can contain different configurations (e.g. prompts, models, tools). The LangGraph Server API provides several endpoints for creating and managing assistants. See the [API reference](../cloud/reference/api/api_ref.html) and [this how-to](../cloud/how-tos/configuration_cloud.md) for more details on how to create assistants.
@@ -26,6 +26,6 @@ Once you've created an assistant, subsequent edits to that assistant will create
## Execution
A **run** is an invocation of an assistant. Each run may have its own input, configuration, context, and metadata, which may affect execution and output of the underlying graph. A run can optionally be executed on a [thread](./persistence.md#threads).
A **run** is an invocation of an assistant. Each run may have its own input, configuration, and metadata, which may affect execution and output of the underlying graph. A run can optionally be executed on a [thread](./persistence.md#threads).
The LangGraph Platform API provides several endpoints for creating and managing runs. See the [API reference](../cloud/reference/api/api_ref.html#tag/thread-runs/) for more details.
+1 -1
View File
@@ -10,7 +10,7 @@ search:
There are two free options for deploying LangGraph applications via the LangGraph Server:
1. [Local](../tutorials/langgraph-platform/local-server.md): Deploy for local testing and development.
1. [Standalone Container (Lite)](../concepts/langgraph_standalone_container.md): A limited version of Standalone Container for deployments unlikely to see more than 1 million node executions per year and that do not need crons and other enterprise features. Standalone Container (Lite) deployment option is free with a LangSmith API key.
1. [Standalone Container (Lite)](../concepts/langgraph_standalone_container.md): A limited version of Standalone Container for deployments unlikely to see more that 1 million node executions per year and that do not need crons and other enterprise features. Standalone Container (Lite) deployment option is free with a LangSmith API key.
## Production deployment
+4 -4
View File
@@ -48,7 +48,7 @@ If a [node](./low_level.md#nodes) contains multiple operations, you may find it
from typing_extensions import TypedDict
import uuid
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
from langgraph.graph import StateGraph, START, END
import requests
@@ -74,7 +74,7 @@ If a [node](./low_level.md#nodes) contains multiple operations, you may find it
builder.add_edge("call_api", END)
# Specify a checkpointer
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
# Compile the graph with the checkpointer
graph = builder.compile(checkpointer=checkpointer)
@@ -94,7 +94,7 @@ If a [node](./low_level.md#nodes) contains multiple operations, you may find it
from typing_extensions import TypedDict
import uuid
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
from langgraph.func import task
from langgraph.graph import StateGraph, START, END
import requests
@@ -129,7 +129,7 @@ If a [node](./low_level.md#nodes) contains multiple operations, you may find it
builder.add_edge("call_api", END)
# Specify a checkpointer
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
# Compile the graph with the checkpointer
graph = builder.compile(checkpointer=checkpointer)
+30 -33
View File
@@ -39,7 +39,7 @@ Here are some key differences:
Below we demonstrate a simple application that writes an essay and [interrupts](human_in_the_loop.md) to request human review.
```python
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
from langgraph.func import entrypoint, task
from langgraph.types import interrupt
@@ -50,7 +50,7 @@ def write_essay(topic: str) -> str:
time.sleep(1) # A placeholder for a long-running task.
return f"An essay about topic: {topic}"
@entrypoint(checkpointer=InMemorySaver())
@entrypoint(checkpointer=MemorySaver())
def workflow(topic: str) -> dict:
"""A simple workflow that writes an essay and asks for a review."""
essay = write_essay("cat").result()
@@ -79,54 +79,51 @@ def workflow(topic: str) -> dict:
```python
import time
import uuid
from langgraph.func import entrypoint, task
from langgraph.types import interrupt
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
@task
def write_essay(topic: str) -> str:
"""Write an essay about the given topic."""
time.sleep(1) # This is a placeholder for a long-running task.
time.sleep(1) # This is a placeholder for a long-running task.
return f"An essay about topic: {topic}"
@entrypoint(checkpointer=InMemorySaver())
@entrypoint(checkpointer=MemorySaver())
def workflow(topic: str) -> dict:
"""A simple workflow that writes an essay and asks for a review."""
essay = write_essay("cat").result()
is_approved = interrupt(
{
# Any json-serializable payload provided to interrupt as argument.
# It will be surfaced on the client side as an Interrupt when streaming data
# from the workflow.
"essay": essay, # The essay we want reviewed.
# We can add any additional information that we need.
# For example, introduce a key called "action" with some instructions.
"action": "Please approve/reject the essay",
}
)
is_approved = interrupt({
# Any json-serializable payload provided to interrupt as argument.
# It will be surfaced on the client side as an Interrupt when streaming data
# from the workflow.
"essay": essay, # The essay we want reviewed.
# We can add any additional information that we need.
# For example, introduce a key called "action" with some instructions.
"action": "Please approve/reject the essay",
})
return {
"essay": essay, # The essay that was generated
"is_approved": is_approved, # Response from HIL
"essay": essay, # The essay that was generated
"is_approved": is_approved, # Response from HIL
}
thread_id = str(uuid.uuid4())
config = {"configurable": {"thread_id": thread_id}}
config = {
"configurable": {
"thread_id": thread_id
}
}
for item in workflow.stream("cat", config):
print(item)
# > {'write_essay': 'An essay about topic: cat'}
# > {
# > '__interrupt__': (
# > Interrupt(
# > value={
# > 'essay': 'An essay about topic: cat',
# > 'action': 'Please approve/reject the essay'
# > },
# > id='b9b2b9d788f482663ced6dc755c9e981'
# > ),
# > )
# > }
```
```pycon
{'write_essay': 'An essay about topic: cat'}
{'__interrupt__': (Interrupt(value={'essay': 'An essay about topic: cat', 'action': 'Please approve/reject the essay'}, resumable=True, ns=['workflow:f7b8508b-21c0-8b4c-5958-4e8de74d2684'], when='during'),)}
```
An essay has been written and is ready for review. Once the review is provided, we can resume the workflow:
+29 -41
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@@ -45,7 +45,7 @@ The first thing you do when you define a graph is define the `State` of the grap
### Schema
The main documented way to specify the schema of a graph is by using a [`TypedDict`](https://docs.python.org/3/library/typing.html#typing.TypedDict). If you want to provide default values in your state, use a [`dataclass`](https://docs.python.org/3/library/dataclasses.html). We also support using a Pydantic [BaseModel](../how-tos/graph-api.md#use-pydantic-models-for-graph-state) as your graph state if you want recursive data validation (though note that pydantic is less performant than a `TypedDict` or `dataclass`).
The main documented way to specify the schema of a graph is by using `TypedDict`. However, we also support [using a Pydantic BaseModel](../how-tos/graph-api.md#use-pydantic-models-for-graph-state) as your graph state to add **default values** and additional data validation.
By default, the graph will have the same input and output schemas. If you want to change this, you can also specify explicit input and output schemas directly. This is useful when you have a lot of keys, and some are explicitly for input and others for output. See the [guide here](../how-tos/graph-api.md#define-input-and-output-schemas) for how to use.
@@ -192,48 +192,35 @@ class State(MessagesState):
## Nodes
In LangGraph, nodes are Python functions (either synchronous or asynchronous) that accept the following arguments:
1. `state`: The [state](#state) of the graph
2. `config`: A `RunnableConfig` object that contains configuration information like `thread_id` and tracing information like `tags`
3. `runtime`: A `Runtime` object that contains [runtime `context`](#runtime-context) and other information like `store` and `stream_writer`
In LangGraph, nodes are typically python functions (sync or async) where the **first** positional argument is the [state](#state), and (optionally), the **second** positional argument is a "config", containing optional [configurable parameters](#configuration) (such as a `thread_id`).
Similar to `NetworkX`, you add these nodes to a graph using the [add_node][langgraph.graph.StateGraph.add_node] method:
```python
from dataclasses import dataclass
from typing_extensions import TypedDict
from langchain_core.runnables import RunnableConfig
from langgraph.graph import StateGraph
from langgraph.runtime import Runtime
class State(TypedDict):
input: str
results: str
@dataclass
class Context:
user_id: str
builder = StateGraph(State)
def plain_node(state: State):
def my_node(state: State, config: RunnableConfig):
print("In node: ", config["configurable"]["user_id"])
return {"results": f"Hello, {state['input']}!"}
# The second argument is optional
def my_other_node(state: State):
return state
def node_with_runtime(state: State, runtime: Runtime[Context]):
print("In node: ", runtime.context.user_id)
return {"results": f"Hello, {state['input']}!"}
def node_with_config(state: State, config: RunnableConfig):
print("In node with thread_id: ", config["configurable"]["thread_id"])
return {"results": f"Hello, {state['input']}!"}
builder.add_node("plain_node", plain_node)
builder.add_node("node_with_runtime", node_with_runtime)
builder.add_node("node_with_config", node_with_config)
builder.add_node("my_node", my_node)
builder.add_node("other_node", my_other_node)
...
```
@@ -311,7 +298,7 @@ print(graph.invoke({"x": 5}, stream_mode='updates')) # (2)!
[{'expensive_node': {'result': 10}, '__metadata__': {'cached': True}}]
```
1. First run takes two seconds to run (due to mocked expensive computation).
1. First run takes the full second to run (due to mocked expensive computation).
2. Second run utilizes cache and returns quickly.
## Edges
@@ -472,32 +459,33 @@ LangGraph can easily handle migrations of graph definitions (nodes, edges, and s
- State keys that are renamed lose their saved state in existing threads
- State keys whose types change in incompatible ways could currently cause issues in threads with state from before the change -- if this is a blocker please reach out and we can prioritize a solution.
## Runtime Context
## Configuration
When creating a graph, you can specify a `context_schema` for runtime context passed to nodes. This is useful for passing
information to nodes that is not part of the graph state. For example, you might want to pass dependencies such as model name or a database connection.
When creating a graph, you can also mark that certain parts of the graph are configurable. This is commonly done to enable easily switching between models or system prompts. This allows you to create a single "cognitive architecture" (the graph) but have multiple different instance of it.
You can optionally specify a `config_schema` when creating a graph.
```python
@dataclass
class ContextSchema:
llm_provider: str = "openai"
class ConfigSchema(TypedDict):
llm: str
graph = StateGraph(State, context_schema=ContextSchema)
graph = StateGraph(State, config_schema=ConfigSchema)
```
You can then pass this context into the graph using the `context` parameter of the `invoke` method.
You can then pass this configuration into the graph using the `configurable` config field.
```python
graph.invoke(inputs, context={"llm_provider": "anthropic"})
config = {"configurable": {"llm": "anthropic"}}
graph.invoke(inputs, config=config)
```
You can then access and use this context inside a node or conditional edge:
You can then access and use this configuration inside a node or conditional edge:
```python
from langgraph.runtime import Runtime
def node_a(state: State, runtime: Runtime[ContextSchema]):
llm = get_llm(runtime.context.llm_provider)
def node_a(state, config):
llm_type = config.get("configurable", {}).get("llm", "openai")
llm = get_llm(llm_type)
...
```
@@ -508,7 +496,7 @@ See [this guide](../how-tos/graph-api.md#add-runtime-configuration) for a full b
The recursion limit sets the maximum number of [super-steps](#graphs) the graph can execute during a single execution. Once the limit is reached, LangGraph will raise `GraphRecursionError`. By default this value is set to 25 steps. The recursion limit can be set on any graph at runtime, and is passed to `.invoke`/`.stream` via the config dictionary. Importantly, `recursion_limit` is a standalone `config` key and should not be passed inside the `configurable` key as all other user-defined configuration. See the example below:
```python
graph.invoke(inputs, config={"recursion_limit": 5}, context={"llm": "anthropic"})
graph.invoke(inputs, config={"recursion_limit": 5, "configurable":{"llm": "anthropic"}})
```
Read [this how-to](https://langchain-ai.github.io/langgraph/how-tos/recursion-limit/) to learn more about how the recursion limit works.
+2 -2
View File
@@ -487,12 +487,12 @@ If you want to fallback to pickle for objects not currently supported by our msg
you can use the `pickle_fallback` argument of the `JsonPlusSerializer`:
```python
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
from langgraph.checkpoint.serde.jsonplus import JsonPlusSerializer
# ... Define the graph ...
graph.compile(
checkpointer=InMemorySaver(serde=JsonPlusSerializer(pickle_fallback=True))
checkpointer=MemorySaver(serde=JsonPlusSerializer(pickle_fallback=True))
)
```
-17
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@@ -1,17 +0,0 @@
# Tracing
Traces are a series of steps that your application takes to go from input to output. Each of these individual steps is represented by a run. You can use [LangSmith](https://smith.langchain.com/) to visualize these execution steps. To use it, [enable tracing for your application](../how-tos/enable-tracing.md). This enables you to do the following:
- [Debug a locally running application](../cloud/how-tos/clone_traces_studio.md).
- [Evaluate the application performance](../agents/evals.md).
- [Monitor the application](https://docs.smith.langchain.com/observability/how_to_guides/dashboards).
To get started, sign up for a free account at [LangSmith](https://smith.langchain.com/).
## Learn more
- [Graph runs in LangSmith](../how-tos/run-id-langsmith.md)
- [LangSmith Observability quickstart](https://docs.smith.langchain.com/observability)
- [Trace with LangGraph](https://docs.smith.langchain.com/observability/how_to_guides/trace_with_langgraph)
- [Tracing conceptual guide](https://docs.smith.langchain.com/observability/concepts#traces)
-5
View File
@@ -2,11 +2,6 @@
The pages in this section provide a conceptual overview and how-tos for the following topics:
## Agent development
- [Overview](../agents/overview.md): Use prebuilt components to build an agent.
- [Run an agent](../agents/run_agents.md): Run an agent by providing input, interpreting output, enabling streaming, and controlling execution limits.
## LangGraph APIs
- [Graph API](../concepts/low_level.md): Use the Graph API to define workflows using a graph paradigm.
+14 -43
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@@ -31,12 +31,12 @@ To leverage custom authentication and access user-level metadata in your deploym
api_key = headers.get("x-api-key")
if not api_key or not is_valid_key(api_key):
raise Auth.exceptions.HTTPException(status_code=401, detail="Invalid API key")
# Fetch user-specific tokens from your secret store
# Fetch user-specific tokens from your secret store
user_tokens = await fetch_user_tokens(api_key)
return { # (2)!
"identity": api_key, # fetch user ID from LangSmith
"identity": api_key, # fetch user ID from LangSmith
"github_token" : user_tokens.github_token
"jira_token" : user_tokens.jira_token
# ... custom fields/secrets here
@@ -50,14 +50,14 @@ To leverage custom authentication and access user-level metadata in your deploym
```json hl_lines="7-9"
{
"dependencies": ["."],
"graphs": {
"dependencies": ["."],
"graphs": {
"agent": "./agent.py:graph"
},
"env": ".env",
"auth": {
},
"env": ".env",
"auth": {
"path": "./auth.py:my_auth"
}
}
}
```
@@ -80,7 +80,7 @@ To leverage custom authentication and access user-level metadata in your deploym
```python
from langgraph.pregel.remote import RemoteGraph
my_token = "your-token" # In practice, you would generate a signed token with your auth provider
remote_graph = RemoteGraph(
"agent",
@@ -133,44 +133,15 @@ To allow an agent to perform authenticated actions on behalf of the user, access
def my_node(state, config):
user_config = config["configurable"].get("langgraph_auth_user")
# token was resolved during the @auth.authenticate function
token = user_config.get("github_token","")
token = user_config.get("github_token","")
...
```
!!! note
Fetch user credentials from a secure secret store. Storing secrets in graph state is not recommended.
### Authorizing a Studio user
By default, if you add custom authorization on your resources, this will also apply to interactions made from the Studio. If you want, you can handle logged-in Studio users differently by checking [is_studio_user()](../../reference/functions/sdk_auth.isStudioUser.html).
!!! note
`is_studio_user` was added in version 0.1.73 of the langgraph-sdk. If you're on an older version, you can still check whether `isinstance(ctx.user, StudioUser)`.
```python
from langgraph_sdk.auth import is_studio_user, Auth
auth = Auth()
# ... Setup authenticate, etc.
@auth.on
async def add_owner(
ctx: Auth.types.AuthContext,
value: dict # The payload being sent to this access method
) -> dict: # Returns a filter dict that restricts access to resources
if is_studio_user(ctx.user):
return {}
filters = {"owner": ctx.user.identity}
metadata = value.setdefault("metadata", {})
metadata.update(filters)
return filters
```
Only use this if you want to permit developer access to a graph deployed on the managed LangGraph Platform SaaS.
## Learn more
- [Authentication & Access Control](../../concepts/auth.md)
- [LangGraph Platform](../../concepts/langgraph_platform.md)
- [Setting up custom authentication tutorial](../../tutorials/auth/getting_started.md)
* [Authentication & Access Control](../../concepts/auth.md)
* [LangGraph Platform](../../concepts/langgraph_platform.md)
* [Setting up custom authentication tutorial](../../tutorials/auth/getting_started.md)
@@ -77,7 +77,7 @@
"metadata": {},
"outputs": [
{
"name": "stdout",
"name": "stdin",
"output_type": "stream",
"text": [
"OPENAI_API_KEY: ········\n"
@@ -165,7 +165,7 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 8,
"id": "d129e4e1-3766-429a-b806-cde3d8bc0469",
"metadata": {},
"outputs": [],
@@ -173,7 +173,7 @@
"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",
"from langgraph.checkpoint.memory import InMemorySaver\n",
"from langgraph.checkpoint.memory import MemorySaver\n",
"\n",
"\n",
"@task\n",
@@ -192,7 +192,7 @@
"\n",
"\n",
"# add short-term memory for storing conversation history\n",
"checkpointer = InMemorySaver()\n",
"checkpointer = MemorySaver()\n",
"\n",
"\n",
"@entrypoint(checkpointer=checkpointer)\n",
@@ -222,12 +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",
@@ -253,9 +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",
@@ -264,7 +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",
@@ -318,7 +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",
@@ -334,7 +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",
+5 -5
View File
@@ -75,7 +75,7 @@ We will now create a LangGraph chatbot graph that calls AutoGen agent.
```python
from langchain_core.messages import convert_to_openai_messages
from langgraph.graph import StateGraph, MessagesState, START
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
def call_autogen_agent(state: MessagesState):
# Convert LangGraph messages to OpenAI format for AutoGen
@@ -101,7 +101,7 @@ def call_autogen_agent(state: MessagesState):
return {"messages": {"role": "assistant", "content": final_content}}
# Create the graph with memory for persistence
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
# Build the graph
builder = StateGraph(MessagesState)
@@ -228,7 +228,7 @@ my-autogen-agent/
import autogen
from langchain_core.messages import convert_to_openai_messages
from langgraph.graph import StateGraph, MessagesState, START
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
# AutoGen configuration
config_list = [{"model": "gpt-4o", "api_key": os.environ["OPENAI_API_KEY"]}]
@@ -276,7 +276,7 @@ my-autogen-agent/
# Create and compile the graph
def create_graph():
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
builder = StateGraph(MessagesState)
builder.add_node("autogen", call_autogen_agent)
builder.add_edge(START, "autogen")
@@ -290,7 +290,7 @@ my-autogen-agent/
```
langgraph>=0.1.0
ag2>=0.2.0
pyautogen>=0.2.0
langchain-core>=0.1.0
langchain-openai>=0.0.5
```
@@ -167,7 +167,7 @@
"from langchain_core.messages import BaseMessage\n",
"from langgraph.func import entrypoint, task\n",
"from langgraph.graph import add_messages\n",
"from langgraph.checkpoint.memory import InMemorySaver\n",
"from langgraph.checkpoint.memory import MemorySaver\n",
"from langgraph.store.base import BaseStore\n",
"\n",
"\n",
@@ -192,7 +192,7 @@
"\n",
"\n",
"# NOTE: we're passing the store object here when creating a workflow via entrypoint()\n",
"@entrypoint(checkpointer=InMemorySaver(), store=in_memory_store)\n",
"@entrypoint(checkpointer=MemorySaver(), store=in_memory_store)\n",
"def workflow(\n",
" inputs: list[BaseMessage],\n",
" *,\n",
-16
View File
@@ -1,16 +0,0 @@
# Enable tracing for your application
To enable [tracing](../concepts/tracing.md) for your application, set the following environment variables:
```python
export LANGSMITH_TRACING=true
export LANGSMITH_API_KEY=<your-api-key>
```
For more information, see [Trace with LangGraph](https://docs.smith.langchain.com/observability/how_to_guides/trace_with_langgraph).
## Learn more
- [Graph runs in LangSmith](../how-tos/run-id-langsmith.md)
- [LangSmith Observability quickstart](https://docs.smith.langchain.com/observability)
- [Tracing conceptual guide](https://docs.smith.langchain.com/observability/concepts#traces)
+38 -40
View File
@@ -328,15 +328,14 @@ Output of graph invocation: {'a': 'set by node_3'}
A [StateGraph](https://langchain-ai.github.io/langgraph/reference/graphs.md#langgraph.graph.StateGraph) accepts a `state_schema` argument on initialization that specifies the "shape" of the state that the nodes in the graph can access and update.
In our examples, we typically use a python-native `TypedDict` or [`dataclass`](https://docs.python.org/3/library/dataclasses.html) for `state_schema`, but `state_schema` can be any [type](https://docs.python.org/3/library/stdtypes.html#type-objects).
In our examples, we typically use a python-native `TypedDict` for `state_schema`, but `state_schema` can be any [type](https://docs.python.org/3/library/stdtypes.html#type-objects).
Here, we'll see how a [Pydantic BaseModel](https://docs.pydantic.dev/latest/api/base_model/) can be used for `state_schema` to add run-time validation on **inputs**.
Here, we'll see how a [Pydantic BaseModel](https://docs.pydantic.dev/latest/api/base_model/). can be used for `state_schema` to add run time validation on **inputs**.
!!! note "Known Limitations"
- Currently, the output of the graph will **NOT** be an instance of a pydantic model.
- Run-time validation only occurs on inputs into nodes, not on the outputs.
- The validation error trace from pydantic does not show which node the error arises in.
- Pydantic's recursive validation can be slow. For performance-sensitive applications, you may want to consider using a `dataclass` instead.
```python
from langgraph.graph import StateGraph, START, END
@@ -514,12 +513,12 @@ To add runtime configuration:
See below for a simple example:
```python
from langchain_core.runnables import RunnableConfig
from langgraph.graph import END, StateGraph, START
from langgraph.runtime import Runtime
from typing_extensions import TypedDict
# 1. Specify config schema
class ContextSchema(TypedDict):
class ConfigSchema(TypedDict):
my_runtime_value: str
# 2. Define a graph that accesses the config in a node
@@ -527,18 +526,18 @@ class State(TypedDict):
my_state_value: str
# highlight-next-line
def node(state: State, runtime: Runtime[ContextSchema]):
def node(state: State, config: RunnableConfig):
# highlight-next-line
if runtime.context["my_runtime_value"] == "a":
if config["configurable"]["my_runtime_value"] == "a":
return {"my_state_value": 1}
# highlight-next-line
elif runtime.context["my_runtime_value"] == "b":
elif config["configurable"]["my_runtime_value"] == "b":
return {"my_state_value": 2}
else:
raise ValueError("Unknown values.")
# highlight-next-line
builder = StateGraph(State, context_schema=ContextSchema)
builder = StateGraph(State, config_schema=ConfigSchema)
builder.add_node(node)
builder.add_edge(START, "node")
builder.add_edge("node", END)
@@ -547,9 +546,9 @@ graph = builder.compile()
# 3. Pass in configuration at runtime:
# highlight-next-line
print(graph.invoke({}, context={"my_runtime_value": "a"}))
print(graph.invoke({}, {"configurable": {"my_runtime_value": "a"}}))
# highlight-next-line
print(graph.invoke({}, context={"my_runtime_value": "b"}))
print(graph.invoke({}, {"configurable": {"my_runtime_value": "b"}}))
```
```
{'my_state_value': 1}
@@ -560,28 +559,27 @@ print(graph.invoke({}, context={"my_runtime_value": "b"}))
Below we demonstrate a practical example in which we configure what LLM to use at runtime. We will use both OpenAI and Anthropic models.
```python
from dataclasses import dataclass
from langchain.chat_models import init_chat_model
from langgraph.graph import MessagesState, END, StateGraph, START
from langgraph.runtime import Runtime
from langchain_core.runnables import RunnableConfig
from langgraph.graph import MessagesState
from langgraph.graph import END, StateGraph, START
from typing_extensions import TypedDict
@dataclass
class ContextSchema:
model_provider: str = "anthropic"
class ConfigSchema(TypedDict):
model: str
MODELS = {
"anthropic": init_chat_model("anthropic:claude-3-5-haiku-latest"),
"openai": init_chat_model("openai:gpt-4.1-mini"),
}
def call_model(state: MessagesState, runtime: Runtime[ContextSchema]):
model = MODELS[runtime.context.model_provider]
def call_model(state: MessagesState, config: RunnableConfig):
model = config["configurable"].get("model", "anthropic")
model = MODELS[model]
response = model.invoke(state["messages"])
return {"messages": [response]}
builder = StateGraph(MessagesState, context_schema=ContextSchema)
builder = StateGraph(MessagesState, config_schema=ConfigSchema)
builder.add_node("model", call_model)
builder.add_edge(START, "model")
builder.add_edge("model", END)
@@ -593,7 +591,8 @@ print(graph.invoke({}, context={"my_runtime_value": "b"}))
# With no configuration, uses default (Anthropic)
response_1 = graph.invoke({"messages": [input_message]})["messages"][-1]
# Or, can set OpenAI
response_2 = graph.invoke({"messages": [input_message]}, context={"model_provider": "openai"})["messages"][-1]
config = {"configurable": {"model": "openai"}}
response_2 = graph.invoke({"messages": [input_message]}, config=config)["messages"][-1]
print(response_1.response_metadata["model_name"])
print(response_2.response_metadata["model_name"])
@@ -607,33 +606,32 @@ print(graph.invoke({}, context={"my_runtime_value": "b"}))
Below we demonstrate a practical example in which we configure two parameters: the LLM and system message to use at runtime.
```python
from dataclasses import dataclass
from typing import Optional
from langchain.chat_models import init_chat_model
from langchain_core.messages import SystemMessage
from langchain_core.runnables import RunnableConfig
from langgraph.graph import END, MessagesState, StateGraph, START
from langgraph.runtime import Runtime
from typing_extensions import TypedDict
@dataclass
class ContextSchema:
model_provider: str = "anthropic"
system_message: str | None = None
class ConfigSchema(TypedDict):
model: Optional[str]
system_message: Optional[str]
MODELS = {
"anthropic": init_chat_model("anthropic:claude-3-5-haiku-latest"),
"openai": init_chat_model("openai:gpt-4.1-mini"),
}
def call_model(state: MessagesState, runtime: Runtime[ContextSchema]):
model = MODELS[runtime.context.model_provider]
def call_model(state: MessagesState, config: RunnableConfig):
model = config["configurable"].get("model", "anthropic")
model = MODELS[model]
messages = state["messages"]
if (system_message := runtime.context.system_message):
if system_message := config["configurable"].get("system_message"):
messages = [SystemMessage(system_message)] + messages
response = model.invoke(messages)
return {"messages": [response]}
builder = StateGraph(MessagesState, context_schema=ContextSchema)
builder = StateGraph(MessagesState, config_schema=ConfigSchema)
builder.add_node("model", call_model)
builder.add_edge(START, "model")
builder.add_edge("model", END)
@@ -642,7 +640,8 @@ print(graph.invoke({}, context={"my_runtime_value": "b"}))
# Usage
input_message = {"role": "user", "content": "hi"}
response = graph.invoke({"messages": [input_message]}, context={"model_provider": "openai", "system_message": "Respond in Italian."})
config = {"configurable": {"model": "openai", "system_message": "Respond in Italian."}}
response = graph.invoke({"messages": [input_message]}, config)
for message in response["messages"]:
message.pretty_print()
```
@@ -1152,13 +1151,12 @@ LangGraph supports map-reduce and other advanced branching patterns using the Se
```python
from langgraph.graph import StateGraph, START, END
from langgraph.types import Send
from typing_extensions import TypedDict, Annotated
import operator
from typing_extensions import TypedDict
class OverallState(TypedDict):
topic: str
subjects: list[str]
jokes: Annotated[list[str], operator.add]
jokes: list[str]
best_selected_joke: str
def generate_topics(state: OverallState):
@@ -1196,7 +1194,7 @@ from IPython.display import Image, display
display(Image(graph.get_graph().draw_mermaid_png()))
```
![Map-reduce graph with fanout](assets/graph_api_image_6.png)
![Map-reduce graph with fanout](assets/graph_api_image_2.png)
```python
# Call the graph: here we call it to generate a list of jokes
@@ -1448,7 +1446,7 @@ Recursion Error
display(Image(graph.get_graph().draw_mermaid_png()))
```
![Complex loop graph with branches](assets/graph_api_image_8.png)
![Complex loop graph with branches](assets/graph_api_image_4.png)
This graph looks complex, but can be conceptualized as loop of [supersteps](../concepts/low_level.md#graphs):
@@ -1567,9 +1565,9 @@ class State(TypedDict):
def node_a(state: State) -> Command[Literal["node_b", "node_c"]]:
print("Called A")
value = random.choice(["b", "c"])
value = random.choice(["a", "b"])
# this is a replacement for a conditional edge function
if value == "b":
if value == "a":
goto = "node_b"
else:
goto = "node_c"
@@ -54,7 +54,13 @@ graph = graph_builder.compile(checkpointer=checkpointer) # (4)!
config = {"configurable": {"thread_id": "some_id"}}
result = graph.invoke({"some_text": "original text"}, config=config) # (5)!
print(result['__interrupt__']) # (6)!
# > [Interrupt(value={'text_to_revise': 'original text'}, id='a0d9dd40440ac7be2720dc5c20858627')]
# > [
# > Interrupt(
# > value={'text_to_revise': 'original text'},
# > resumable=True,
# > ns=['human_node:6ce9e64f-edef-fe5d-f7dc-511fa9526960']
# > )
# > ]
# highlight-next-line
print(graph.invoke(Command(resume="Edited text"), config=config)) # (7)!
@@ -74,27 +80,25 @@ print(graph.invoke(Command(resume="Edited text"), config=config)) # (7)!
```python
from typing import TypedDict
import uuid
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.constants import START
from langgraph.graph import StateGraph
# highlight-next-line
from langgraph.types import interrupt, Command
class State(TypedDict):
some_text: str
def human_node(state: State):
# highlight-next-line
value = interrupt( # (1)!
value = interrupt( # (1)!
{
"text_to_revise": state["some_text"] # (2)!
"text_to_revise": state["some_text"] # (2)!
}
)
return {
"some_text": value # (3)!
"some_text": value # (3)!
}
@@ -102,15 +106,25 @@ print(graph.invoke(Command(resume="Edited text"), config=config)) # (7)!
graph_builder = StateGraph(State)
graph_builder.add_node("human_node", human_node)
graph_builder.add_edge(START, "human_node")
checkpointer = InMemorySaver() # (4)!
checkpointer = InMemorySaver() # (4)!
graph = graph_builder.compile(checkpointer=checkpointer)
# Pass a thread ID to the graph to run it.
config = {"configurable": {"thread_id": uuid.uuid4()}}
# Run the graph until the interrupt is hit.
result = graph.invoke({"some_text": "original text"}, config=config) # (5)!
print(result["__interrupt__"]) # (6)!
# > [Interrupt(value={'text_to_revise': 'original text'}, id='6d7c4048049254c83195429a3659661d')]
# Run the graph until the interrupt is hit.
result = graph.invoke({"some_text": "original text"}, config=config) # (5)!
print(result['__interrupt__']) # (6)!
# > [
# > Interrupt(
# > value={'text_to_revise': 'original text'},
# > resumable=True,
# > ns=['human_node:6ce9e64f-edef-fe5d-f7dc-511fa9526960']
# > )
# > ]
# highlight-next-line
print(graph.invoke(Command(resume="Edited text"), config=config)) # (7)!
@@ -153,7 +167,7 @@ For example, once your graph has been interrupted (multiple times, theoretically
```python
resume_map = {
i.id: f"human input for prompt {i.value}"
i.interrupt_id: f"human input for prompt {i.value}"
for i in parent.get_state(thread_config).interrupts
}
@@ -212,7 +226,7 @@ graph.invoke(Command(resume=True), config=thread_config)
from langgraph.constants import START, END
from langgraph.graph import StateGraph
from langgraph.types import interrupt, Command
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
# Define the shared graph state
class State(TypedDict):
@@ -257,7 +271,7 @@ graph.invoke(Command(resume=True), config=thread_config)
builder.add_edge("approved_path", END)
builder.add_edge("rejected_path", END)
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
graph = builder.compile(checkpointer=checkpointer)
# Run until interrupt
@@ -325,7 +339,7 @@ graph.invoke(
from langgraph.constants import START, END
from langgraph.graph import StateGraph
from langgraph.types import interrupt, Command
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
# Define the graph state
class State(TypedDict):
@@ -364,7 +378,7 @@ graph.invoke(
builder.add_edge("downstream_use", END)
# Set up in-memory checkpointing for interrupt support
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
graph = builder.compile(checkpointer=checkpointer)
# Invoke the graph until it hits the interrupt
@@ -374,15 +388,14 @@ graph.invoke(
# Output interrupt payload
print(result["__interrupt__"])
# Example output:
# > [
# > Interrupt(
# > value={
# > 'task': 'Please review and edit the generated summary if necessary.',
# > 'generated_summary': 'The cat sat on the mat and looked at the stars.'
# > },
# > id='...'
# > )
# > ]
# Interrupt(
# value={
# 'task': 'Please review and edit the generated summary if necessary.',
# 'generated_summary': 'The cat sat on the mat and looked at the stars.'
# },
# resumable=True,
# ...
# )
# Resume the graph with human-edited input
edited_summary = "The cat lay on the rug, gazing peacefully at the night sky."
@@ -642,7 +655,7 @@ def human_node(state: State):
from langgraph.constants import START, END
from langgraph.graph import StateGraph
from langgraph.types import interrupt, Command
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
# Define graph state
class State(TypedDict):
@@ -681,7 +694,7 @@ def human_node(state: State):
builder.add_edge("report_age", END)
# Create the graph with a memory checkpointer
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
graph = builder.compile(checkpointer=checkpointer)
# Run the graph until the first interrupt
@@ -938,7 +951,7 @@ def node_in_parent_graph(state: State):
from langgraph.graph import StateGraph
from langgraph.constants import START
from langgraph.types import interrupt, Command
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
class State(TypedDict):
@@ -964,7 +977,7 @@ def node_in_parent_graph(state: State):
print(f"Got an answer of {answer}")
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
subgraph_builder = StateGraph(State)
subgraph_builder.add_node("some_node", node_in_subgraph)
@@ -995,7 +1008,7 @@ def node_in_parent_graph(state: State):
builder.add_edge(START, "parent_node")
# A checkpointer must be enabled for interrupts to work!
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
graph = builder.compile(checkpointer=checkpointer)
config = {
@@ -1019,7 +1032,7 @@ def node_in_parent_graph(state: State):
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?', id='...'),)}
{'__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 ---
Entered `parent_node` a total of 2 times
Entered human_node in sub-graph a total of 2 times
@@ -1044,7 +1057,7 @@ To avoid issues, refrain from dynamically changing the node's structure between
from langgraph.graph import StateGraph
from langgraph.constants import START
from langgraph.types import interrupt, Command
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
class State(TypedDict):
@@ -1078,7 +1091,7 @@ To avoid issues, refrain from dynamically changing the node's structure between
builder.add_edge(START, "human_node")
# A checkpointer must be enabled for interrupts to work!
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
graph = builder.compile(checkpointer=checkpointer)
config = {
@@ -1095,7 +1108,7 @@ To avoid issues, refrain from dynamically changing the node's structure between
```
```pycon
{'__interrupt__': (Interrupt(value='what is your name?', id='...'),)}
{'__interrupt__': (Interrupt(value='what is your name?', resumable=True, ns=['human_node:3a007ef9-c30d-c357-1ec1-86a1a70d8fba'], when='during'),)}
Name: N/A. Age: John
{'human_node': {'age': 'John', 'name': 'N/A'}}
```
@@ -121,7 +121,7 @@
"\n",
"# highlight-next-line\n",
"from langgraph.types import Command, interrupt\n",
"from langgraph.checkpoint.memory import InMemorySaver\n",
"from langgraph.checkpoint.memory import MemorySaver\n",
"from IPython.display import Image, display\n",
"\n",
"\n",
@@ -157,7 +157,7 @@
"builder.add_edge(\"step_3\", END)\n",
"\n",
"# Set up memory\n",
"memory = InMemorySaver()\n",
"memory = MemorySaver()\n",
"\n",
"# Add\n",
"graph = builder.compile(checkpointer=memory)\n",
@@ -435,9 +435,9 @@
"workflow.add_edge(\"ask_human\", \"agent\")\n",
"\n",
"# Set up memory\n",
"from langgraph.checkpoint.memory import InMemorySaver\n",
"from langgraph.checkpoint.memory import MemorySaver\n",
"\n",
"memory = InMemorySaver()\n",
"memory = MemorySaver()\n",
"\n",
"# Finally, we compile it!\n",
"# This compiles it into a LangChain Runnable,\n",
@@ -224,7 +224,7 @@
"from langgraph.prebuilt import create_react_agent\n",
"from langgraph.graph import add_messages\n",
"from langgraph.func import entrypoint, task\n",
"from langgraph.checkpoint.memory import InMemorySaver\n",
"from langgraph.checkpoint.memory import MemorySaver\n",
"from langgraph.types import interrupt, Command\n",
"\n",
"model = ChatAnthropic(model=\"claude-3-5-sonnet-latest\")\n",
@@ -272,7 +272,7 @@
" return response[\"messages\"]\n",
"\n",
"\n",
"checkpointer = InMemorySaver()\n",
"checkpointer = MemorySaver()\n",
"\n",
"\n",
"def string_to_uuid(input_string):\n",
+2 -2
View File
@@ -375,7 +375,7 @@ def agent(state) -> Command[Literal["agent", "another_agent", "human"]]:
from langgraph.graph import MessagesState, StateGraph, START
from langgraph.prebuilt import create_react_agent, InjectedState
from langgraph.types import Command, interrupt
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
model = ChatAnthropic(model="claude-3-5-sonnet-latest")
@@ -467,7 +467,7 @@ def agent(state) -> Command[Literal["agent", "another_agent", "human"]]:
builder.add_edge(START, "travel_advisor")
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
graph = builder.compile(checkpointer=checkpointer)
```
@@ -28,9 +28,9 @@
"1. Create an instance of a checkpointer:\n",
"\n",
" ```python\n",
" from langgraph.checkpoint.memory import InMemorySaver\n",
" from langgraph.checkpoint.memory import MemorySaver\n",
" \n",
" checkpointer = InMemorySaver() \n",
" checkpointer = MemorySaver() \n",
" ```\n",
"\n",
"2. Pass `checkpointer` instance to the `entrypoint()` decorator:\n",
@@ -184,7 +184,7 @@
"from langchain_core.messages import BaseMessage\n",
"from langgraph.graph import add_messages\n",
"from langgraph.func import entrypoint, task\n",
"from langgraph.checkpoint.memory import InMemorySaver\n",
"from langgraph.checkpoint.memory import MemorySaver\n",
"\n",
"\n",
"@task\n",
@@ -193,7 +193,7 @@
" return response\n",
"\n",
"\n",
"checkpointer = InMemorySaver()\n",
"checkpointer = MemorySaver()\n",
"\n",
"\n",
"@entrypoint(checkpointer=checkpointer)\n",
@@ -261,7 +261,7 @@
"\n",
"To add thread-level persistence to our agent:\n",
"\n",
"1. Select a [checkpointer](../../concepts/persistence#checkpointer-libraries): here we will use [InMemorySaver](../../reference/checkpoints/#langgraph.checkpoint.memory.InMemorySaver), a simple in-memory checkpointer.\n",
"1. Select a [checkpointer](../../concepts/persistence#checkpointer-libraries): here we will use [MemorySaver](../../reference/checkpoints/#langgraph.checkpoint.memory.MemorySaver), a simple in-memory checkpointer.\n",
"2. Update our entrypoint to accept the previous messages state as a second argument. Here, we simply append the message updates to the previous sequence of messages.\n",
"3. Choose which values will be returned from the workflow and which will be saved by the checkpointer as `previous` using `entrypoint.final` (optional)"
]
@@ -272,10 +272,10 @@
"metadata": {},
"outputs": [],
"source": [
"from langgraph.checkpoint.memory import InMemorySaver\n",
"from langgraph.checkpoint.memory import MemorySaver\n",
"\n",
"# highlight-next-line\n",
"checkpointer = InMemorySaver()\n",
"checkpointer = MemorySaver()\n",
"\n",
"\n",
"# highlight-next-line\n",
+25 -25
View File
@@ -26,7 +26,7 @@ my_workflow.invoke({"value": 1, "another_value": 2})
```python
import uuid
from langgraph.func import entrypoint, task
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
# Task that checks if a number is even
@task
@@ -39,7 +39,7 @@ my_workflow.invoke({"value": 1, "another_value": 2})
return "The number is even." if is_even else "The number is odd."
# Create a checkpointer for persistence
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
@entrypoint(checkpointer=checkpointer)
def workflow(inputs: dict) -> str:
@@ -63,7 +63,7 @@ my_workflow.invoke({"value": 1, "another_value": 2})
import uuid
from langchain.chat_models import init_chat_model
from langgraph.func import entrypoint, task
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
llm = init_chat_model('openai:gpt-3.5-turbo')
@@ -77,7 +77,7 @@ my_workflow.invoke({"value": 1, "another_value": 2})
]).content
# Create a checkpointer for persistence
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
@entrypoint(checkpointer=checkpointer)
def workflow(topic: str) -> str:
@@ -114,7 +114,7 @@ def graph(numbers: list[int]) -> list[str]:
import uuid
from langchain.chat_models import init_chat_model
from langgraph.func import entrypoint, task
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
# Initialize the LLM model
llm = init_chat_model("openai:gpt-3.5-turbo")
@@ -129,7 +129,7 @@ def graph(numbers: list[int]) -> list[str]:
return response.content
# Create a checkpointer for persistence
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
@entrypoint(checkpointer=checkpointer)
def workflow(topics: list[str]) -> str:
@@ -176,7 +176,7 @@ def some_workflow(some_input: dict) -> int:
import uuid
from typing import TypedDict
from langgraph.func import entrypoint
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
from langgraph.graph import StateGraph
# Define the shared state type
@@ -194,7 +194,7 @@ def some_workflow(some_input: dict) -> int:
graph = builder.compile()
# Define the functional API workflow
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
@entrypoint(checkpointer=checkpointer)
def workflow(x: int) -> dict:
@@ -227,10 +227,10 @@ def my_workflow(inputs: dict) -> int:
```python
import uuid
from langgraph.func import entrypoint
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
# Initialize a checkpointer
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
# A reusable sub-workflow that multiplies a number
@entrypoint()
@@ -258,10 +258,10 @@ Example of using the streaming API to stream both updates and custom data.
```python
from langgraph.func import entrypoint
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
from langgraph.config import get_stream_writer # (1)!
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
@entrypoint(checkpointer=checkpointer)
def main(inputs: dict) -> int:
@@ -316,7 +316,7 @@ for mode, chunk in main.stream( # (5)!
## Retry policy
```python
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
from langgraph.func import entrypoint, task
from langgraph.types import RetryPolicy
@@ -337,7 +337,7 @@ def get_info():
raise ValueError('Failure')
return "OK"
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
@entrypoint(checkpointer=checkpointer)
def main(inputs, writer):
@@ -392,7 +392,7 @@ for chunk in main.stream({"x": 5}, stream_mode="updates"):
```python
import time
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
from langgraph.func import entrypoint, task
from langgraph.types import StreamWriter
@@ -414,7 +414,7 @@ def get_info():
return "OK"
# Initialize an in-memory checkpointer for persistence
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
@task
def slow_task():
@@ -504,9 +504,9 @@ def step_3(input_query):
We can now compose these tasks in an [entrypoint](../concepts/functional_api.md#entrypoint):
```python
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
@entrypoint(checkpointer=checkpointer)
@@ -577,12 +577,12 @@ def review_tool_call(tool_call: ToolCall) -> Union[ToolCall, ToolMessage]:
We can now update our [entrypoint](../concepts/functional_api.md#entrypoint) to review the generated tool calls. If a tool call is accepted or revised, we execute in the same way as before. Otherwise, we just append the `ToolMessage` supplied by the human. The results of prior tasks — in this case the initial model call — are persisted, so that they are not run again following the `interrupt`.
```python
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
from langgraph.graph.message import add_messages
from langgraph.types import Command, interrupt
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
@entrypoint(checkpointer=checkpointer)
@@ -757,9 +757,9 @@ Use `entrypoint.final` to decouple what is returned to the caller from what is p
```python
from typing import Optional
from langgraph.func import entrypoint
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
@entrypoint(checkpointer=checkpointer)
def accumulate(n: int, *, previous: Optional[int]) -> entrypoint.final[int, int]:
@@ -777,14 +777,14 @@ print(accumulate.invoke(3, config=config)) # 3
### Chatbot example
An example of a simple chatbot using the functional API and the `InMemorySaver` checkpointer.
An example of a simple chatbot using the functional API and the `MemorySaver` checkpointer.
The bot is able to remember the previous conversation and continue from where it left off.
```python
from langchain_core.messages import BaseMessage
from langgraph.graph import add_messages
from langgraph.func import entrypoint, task
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
from langchain_anthropic import ChatAnthropic
model = ChatAnthropic(model="claude-3-5-sonnet-latest")
@@ -794,7 +794,7 @@ def call_model(messages: list[BaseMessage]):
response = model.invoke(messages)
return response
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
@entrypoint(checkpointer=checkpointer)
def workflow(inputs: list[BaseMessage], *, previous: list[BaseMessage]):
+1 -2
View File
@@ -2,6 +2,5 @@
options:
members:
- TAG_HIDDEN
- TAG_NOSTREAM
- START
- END
- END
@@ -256,7 +256,7 @@
"metadata": {},
"outputs": [],
"source": [
"from langgraph.checkpoint.memory import InMemorySaver\n",
"from langgraph.checkpoint.memory import MemorySaver\n",
"from langgraph.graph import StateGraph, START\n",
"from langgraph.graph.message import add_messages\n",
"from typing import Annotated\n",
@@ -267,7 +267,7 @@
" messages: Annotated[list, add_messages]\n",
"\n",
"\n",
"memory = InMemorySaver()\n",
"memory = MemorySaver()\n",
"workflow = StateGraph(State)\n",
"workflow.add_node(\"info\", info_chain)\n",
"workflow.add_node(\"prompt\", prompt_gen_chain)\n",
@@ -1124,7 +1124,7 @@
"metadata": {},
"outputs": [],
"source": [
"from langgraph.checkpoint.memory import InMemorySaver\n",
"from langgraph.checkpoint.memory import MemorySaver\n",
"from langgraph.graph import END, StateGraph, START\n",
"from langgraph.prebuilt import tools_condition\n",
"\n",
@@ -1144,7 +1144,7 @@
"\n",
"# The checkpointer lets the graph persist its state\n",
"# this is a complete memory for the entire graph.\n",
"memory = InMemorySaver()\n",
"memory = MemorySaver()\n",
"part_1_graph = builder.compile(checkpointer=memory)"
]
},
@@ -1943,7 +1943,7 @@
"metadata": {},
"outputs": [],
"source": [
"from langgraph.checkpoint.memory import InMemorySaver\n",
"from langgraph.checkpoint.memory import MemorySaver\n",
"from langgraph.graph import StateGraph\n",
"from langgraph.prebuilt import tools_condition\n",
"\n",
@@ -1967,7 +1967,7 @@
")\n",
"builder.add_edge(\"tools\", \"assistant\")\n",
"\n",
"memory = InMemorySaver()\n",
"memory = MemorySaver()\n",
"part_2_graph = builder.compile(\n",
" checkpointer=memory,\n",
" # NEW: The graph will always halt before executing the \"tools\" node.\n",
@@ -2532,7 +2532,7 @@
"source": [
"from typing import Literal\n",
"\n",
"from langgraph.checkpoint.memory import InMemorySaver\n",
"from langgraph.checkpoint.memory import MemorySaver\n",
"from langgraph.graph import StateGraph\n",
"from langgraph.prebuilt import tools_condition\n",
"\n",
@@ -2576,7 +2576,7 @@
"builder.add_edge(\"safe_tools\", \"assistant\")\n",
"builder.add_edge(\"sensitive_tools\", \"assistant\")\n",
"\n",
"memory = InMemorySaver()\n",
"memory = MemorySaver()\n",
"part_3_graph = builder.compile(\n",
" checkpointer=memory,\n",
" # NEW: The graph will always halt before executing the \"tools\" node.\n",
@@ -3477,7 +3477,7 @@
"source": [
"from typing import Literal\n",
"\n",
"from langgraph.checkpoint.memory import InMemorySaver\n",
"from langgraph.checkpoint.memory import MemorySaver\n",
"from langgraph.graph import StateGraph\n",
"from langgraph.prebuilt import tools_condition\n",
"\n",
@@ -3841,7 +3841,7 @@
"builder.add_conditional_edges(\"fetch_user_info\", route_to_workflow)\n",
"\n",
"# Compile graph\n",
"memory = InMemorySaver()\n",
"memory = MemorySaver()\n",
"part_4_graph = builder.compile(\n",
" checkpointer=memory,\n",
" # Let the user approve or deny the use of sensitive tools\n",
@@ -10,14 +10,14 @@ We will see later that **checkpointing** is _much_ more powerful than simple cha
This tutorial builds on [Add tools](./2-add-tools.md).
## 1. Create a `InMemorySaver` checkpointer
## 1. Create a `MemorySaver` checkpointer
Create a `InMemorySaver` checkpointer:
Create a `MemorySaver` checkpointer:
``` python
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
memory = InMemorySaver()
memory = MemorySaver()
```
This is in-memory checkpointer, which is convenient for the tutorial. However, in a production application, you would likely change this to use `SqliteSaver` or `PostgresSaver` and connect a database.
@@ -172,7 +172,7 @@ from langchain_tavily import TavilySearch
from langchain_core.messages import BaseMessage
from typing_extensions import TypedDict
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
from langgraph.graph import StateGraph
from langgraph.graph.message import add_messages
from langgraph.prebuilt import ToolNode, tools_condition
@@ -200,7 +200,7 @@ graph_builder.add_conditional_edges(
)
graph_builder.add_edge("tools", "chatbot")
graph_builder.set_entry_point("chatbot")
memory = InMemorySaver()
memory = MemorySaver()
graph = graph_builder.compile(checkpointer=memory)
```
@@ -33,7 +33,7 @@ from langchain_tavily import TavilySearch
from langchain_core.tools import tool
from typing_extensions import TypedDict
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
from langgraph.graph import StateGraph, START, END
from langgraph.graph.message import add_messages
from langgraph.prebuilt import ToolNode, tools_condition
@@ -85,7 +85,7 @@ graph_builder.add_edge(START, "chatbot")
We compile the graph with a checkpointer, as before:
```python
memory = InMemorySaver()
memory = MemorySaver()
graph = graph_builder.compile(checkpointer=memory)
```
@@ -230,7 +230,7 @@ from langchain_tavily import TavilySearch
from langchain_core.tools import tool
from typing_extensions import TypedDict
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
from langgraph.graph import StateGraph, START, END
from langgraph.graph.message import add_messages
from langgraph.prebuilt import ToolNode, tools_condition
@@ -268,7 +268,7 @@ graph_builder.add_conditional_edges(
graph_builder.add_edge("tools", "chatbot")
graph_builder.add_edge(START, "chatbot")
memory = InMemorySaver()
memory = MemorySaver()
graph = graph_builder.compile(checkpointer=memory)
```
@@ -239,7 +239,7 @@ from langchain_core.messages import ToolMessage
from langchain_core.tools import InjectedToolCallId, tool
from typing_extensions import TypedDict
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
from langgraph.graph import StateGraph, START, END
from langgraph.graph.message import add_messages
from langgraph.prebuilt import ToolNode, tools_condition
@@ -301,7 +301,7 @@ graph_builder.add_conditional_edges(
graph_builder.add_edge("tools", "chatbot")
graph_builder.add_edge(START, "chatbot")
memory = InMemorySaver()
memory = MemorySaver()
graph = graph_builder.compile(checkpointer=memory)
```
@@ -31,7 +31,7 @@ from langchain_tavily import TavilySearch
from langchain_core.messages import BaseMessage
from typing_extensions import TypedDict
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
from langgraph.graph import StateGraph, START, END
from langgraph.graph.message import add_messages
from langgraph.prebuilt import ToolNode, tools_condition
@@ -60,7 +60,7 @@ graph_builder.add_conditional_edges(
graph_builder.add_edge("tools", "chatbot")
graph_builder.add_edge(START, "chatbot")
memory = InMemorySaver()
memory = MemorySaver()
graph = graph_builder.compile(checkpointer=memory)
```
@@ -12,9 +12,9 @@ Before you begin, ensure you have the following:
=== "Python server"
Python >= 3.11 is required.
```shell
# Python >= 3.11 is required.
pip install --upgrade "langgraph-cli[inmem]"
```
@@ -322,7 +322,7 @@
"from typing import Annotated, List, Sequence\n",
"from langgraph.graph import END, StateGraph, START\n",
"from langgraph.graph.message import add_messages\n",
"from langgraph.checkpoint.memory import InMemorySaver\n",
"from langgraph.checkpoint.memory import MemorySaver\n",
"from typing_extensions import TypedDict\n",
"\n",
"\n",
@@ -361,7 +361,7 @@
"\n",
"builder.add_conditional_edges(\"generate\", should_continue)\n",
"builder.add_edge(\"reflect\", \"generate\")\n",
"memory = InMemorySaver()\n",
"memory = MemorySaver()\n",
"graph = builder.compile(checkpointer=memory)"
]
},
+35 -37
View File
@@ -272,7 +272,7 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 7,
"metadata": {},
"outputs": [],
"source": [
@@ -280,10 +280,10 @@
"from typing import Optional, Dict, Any\n",
"from typing_extensions import Annotated, TypedDict\n",
"from langgraph.graph import StateGraph\n",
"from langgraph.runtime import Runtime\n",
"\n",
"from langgraph.checkpoint.memory import InMemorySaver\n",
"from langgraph.types import Send\n",
"from langchain_core.runnables import RunnableConfig\n",
"from langgraph.constants import Send\n",
"from langgraph.checkpoint.memory import MemorySaver\n",
"\n",
"\n",
"def update_candidates(\n",
@@ -307,27 +307,22 @@
" depth: Annotated[int, operator.add]\n",
"\n",
"\n",
"class Context(TypedDict, total=False):\n",
"class Configuration(TypedDict, total=False):\n",
" max_depth: int\n",
" threshold: float\n",
" k: int\n",
" beam_size: int\n",
"\n",
"\n",
"class EnsuredContext(TypedDict):\n",
" max_depth: int\n",
" threshold: float\n",
" k: int\n",
" beam_size: int\n",
"\n",
"\n",
"def _ensure_context(ctx: Context) -> EnsuredContext:\n",
"def _ensure_configurable(config: RunnableConfig) -> Configuration:\n",
" \"\"\"Get params that configure the search algorithm.\"\"\"\n",
" configurable = config.get(\"configurable\", {})\n",
" return {\n",
" \"max_depth\": ctx.get(\"max_depth\", 10),\n",
" \"threshold\": ctx.get(\"threshold\", 0.9),\n",
" \"k\": ctx.get(\"k\", 5),\n",
" \"beam_size\": ctx.get(\"beam_size\", 3),\n",
" **configurable,\n",
" \"max_depth\": configurable.get(\"max_depth\", 10),\n",
" \"threshold\": config.get(\"threshold\", 0.9),\n",
" \"k\": configurable.get(\"k\", 5),\n",
" \"beam_size\": configurable.get(\"beam_size\", 3),\n",
" }\n",
"\n",
"\n",
@@ -335,11 +330,9 @@
" seed: Optional[Candidate]\n",
"\n",
"\n",
"def expand(\n",
" state: ExpansionState, *, runtime: Runtime[Context]\n",
") -> Dict[str, List[Candidate]]:\n",
"def expand(state: ExpansionState, *, config: RunnableConfig) -> Dict[str, List[str]]:\n",
" \"\"\"Generate the next state.\"\"\"\n",
" ctx = _ensure_context(runtime.context)\n",
" configurable = _ensure_configurable(config)\n",
" if not state.get(\"seed\"):\n",
" candidate_str = \"\"\n",
" else:\n",
@@ -349,8 +342,9 @@
" {\n",
" \"problem\": state[\"problem\"],\n",
" \"candidate\": candidate_str,\n",
" \"k\": ctx[\"k\"],\n",
" \"k\": configurable[\"k\"],\n",
" },\n",
" config=config,\n",
" )\n",
" except Exception:\n",
" return {\"candidates\": []}\n",
@@ -360,7 +354,7 @@
" return {\"candidates\": new_candidates}\n",
"\n",
"\n",
"def score(state: ToTState) -> Dict[str, Any]:\n",
"def score(state: ToTState) -> Dict[str, List[float]]:\n",
" \"\"\"Evaluate the candidate generations.\"\"\"\n",
" candidates = state[\"candidates\"]\n",
" scored = []\n",
@@ -369,9 +363,11 @@
" return {\"scored_candidates\": scored, \"candidates\": \"clear\"}\n",
"\n",
"\n",
"def prune(state: ToTState, *, runtime: Runtime[Context]) -> Dict[str, Any]:\n",
"def prune(\n",
" state: ToTState, *, config: RunnableConfig\n",
") -> Dict[str, List[Dict[str, Any]]]:\n",
" scored_candidates = state[\"scored_candidates\"]\n",
" beam_size = _ensure_context(runtime.context)[\"beam_size\"]\n",
" beam_size = _ensure_configurable(config)[\"beam_size\"]\n",
" organized = sorted(\n",
" scored_candidates, key=lambda candidate: candidate[1], reverse=True\n",
" )\n",
@@ -387,11 +383,11 @@
"\n",
"\n",
"def should_terminate(\n",
" state: ToTState, runtime: Runtime[Context]\n",
" state: ToTState, config: RunnableConfig\n",
") -> Union[Literal[\"__end__\"], Send]:\n",
" ctx = _ensure_context(runtime.context)\n",
" solved = state[\"candidates\"][0].score >= ctx[\"threshold\"]\n",
" if solved or state[\"depth\"] >= ctx[\"max_depth\"]:\n",
" configurable = _ensure_configurable(config)\n",
" solved = state[\"candidates\"][0].score >= configurable[\"threshold\"]\n",
" if solved or state[\"depth\"] >= configurable[\"max_depth\"]:\n",
" return \"__end__\"\n",
" return [\n",
" Send(\"expand\", {**state, \"somevalseed\": candidate})\n",
@@ -400,7 +396,7 @@
"\n",
"\n",
"# Create the graph\n",
"builder = StateGraph(state_schema=ToTState, context_schema=Context)\n",
"builder = StateGraph(state_schema=ToTState, config_schema=Configuration)\n",
"\n",
"# Add nodes\n",
"builder.add_node(expand)\n",
@@ -416,7 +412,7 @@
"builder.add_edge(\"__start__\", \"expand\")\n",
"\n",
"# Compile the graph\n",
"graph = builder.compile(checkpointer=InMemorySaver())"
"graph = builder.compile(checkpointer=MemorySaver())"
]
},
{
@@ -471,11 +467,13 @@
}
],
"source": [
"for step in graph.stream(\n",
" {\"problem\": puzzles[42]},\n",
" config={\"configurable\": {\"thread_id\": \"test_1\"}},\n",
" context={\"depth\": 10},\n",
"):\n",
"config = {\n",
" \"configurable\": {\n",
" \"thread_id\": \"test_1\",\n",
" \"depth\": 10,\n",
" }\n",
"}\n",
"for step in graph.stream({\"problem\": puzzles[42]}, config):\n",
" print(step)"
]
},
@@ -493,7 +491,7 @@
}
],
"source": [
"final_state = graph.get_state({\"configurable\": {\"thread_id\": \"test_1\"}})\n",
"final_state = graph.get_state(config)\n",
"winning_solution = final_state.values[\"candidates\"][0]\n",
"search_depth = final_state.values[\"depth\"]\n",
"if winning_solution[1] == 1:\n",
+4 -4
View File
@@ -1029,7 +1029,7 @@
"metadata": {},
"outputs": [],
"source": [
"from langgraph.checkpoint.memory import InMemorySaver\n",
"from langgraph.checkpoint.memory import MemorySaver\n",
"from langgraph.graph import END, StateGraph, START\n",
"\n",
"builder = StateGraph(State)\n",
@@ -1053,7 +1053,7 @@
"builder.add_conditional_edges(\"evaluate\", control_edge, {END: END, \"solve\": \"solve\"})\n",
"\n",
"\n",
"checkpointer = InMemorySaver()\n",
"checkpointer = MemorySaver()\n",
"graph = builder.compile(checkpointer=checkpointer)"
]
},
@@ -1327,7 +1327,7 @@
"outputs": [],
"source": [
"# This is all the same as before\n",
"from langgraph.checkpoint.memory import InMemorySaver\n",
"from langgraph.checkpoint.memory import MemorySaver\n",
"from langgraph.graph import END, StateGraph, START\n",
"\n",
"builder = StateGraph(State)\n",
@@ -1353,7 +1353,7 @@
"\n",
"\n",
"builder.add_conditional_edges(\"evaluate\", control_edge, {END: END, \"solve\": \"solve\"})\n",
"checkpointer = InMemorySaver()"
"checkpointer = MemorySaver()"
]
},
{
+5 -8
View File
@@ -103,15 +103,14 @@ nav:
- 5. Customize state: tutorials/get-started/5-customize-state.md
- 6. Time travel: tutorials/get-started/6-time-travel.md
- Run a local server: tutorials/langgraph-platform/local-server.md
- General concepts:
- Agent development:
- Workflows & agents: tutorials/workflows.md
- Prebuilt components: agents/overview.md
- Run an agent: agents/run_agents.md
- Agent architectures: concepts/agentic_concepts.md
- Guides:
- guides/index.md
- Agent development:
- Overview: agents/overview.md
- Run an agent: agents/run_agents.md
- LangGraph APIs:
- Graph API:
- Overview: concepts/low_level.md
@@ -158,10 +157,8 @@ nav:
- Overview: concepts/mcp.md
- Use MCP: agents/mcp.md
- Server API: concepts/server-mcp.md
- Tracing:
- Overview: concepts/tracing.md
- Enable tracing: how-tos/enable-tracing.md
- Evaluate performance: agents/evals.md
- Evaluation:
- Basic implementation: agents/evals.md
- Platform-only capabilities:
- LangGraph Platform:
- Overview: concepts/langgraph_platform.md
+1 -3
View File
@@ -112,6 +112,4 @@ extend-include = ["*.ipynb"]
[tool.codespell]
# https://mypy.readthedocs.io/en/stable/config_file.html
# comma-separated list
ignore-words-list = "infor,thead,stdio,nd,jupyter,lets,lite,uis,deque"
# Exclude generated files and directories
skip = "*.ambr,*.lock,*.ipynb,*.yaml,*.zlib,*.css.map,*.js.map"
ignore-words-list = "infor"
Generated
+20 -20
View File
@@ -15,16 +15,16 @@ name = "ag2"
version = "0.9.6"
source = { registry = "https://pypi.org/simple" }
dependencies = [
{ name = "anyio", marker = "python_full_version < '3.13'" },
{ name = "asyncer", marker = "python_full_version < '3.13'" },
{ name = "diskcache", marker = "python_full_version < '3.13'" },
{ name = "docker", marker = "python_full_version < '3.13'" },
{ name = "httpx", marker = "python_full_version < '3.13'" },
{ name = "packaging", marker = "python_full_version < '3.13'" },
{ name = "pydantic", marker = "python_full_version < '3.13'" },
{ name = "python-dotenv", marker = "python_full_version < '3.13'" },
{ name = "termcolor", marker = "python_full_version < '3.13'" },
{ name = "tiktoken", marker = "python_full_version < '3.13'" },
{ name = "anyio" },
{ name = "asyncer" },
{ name = "diskcache" },
{ name = "docker" },
{ name = "httpx" },
{ name = "packaging" },
{ name = "pydantic" },
{ name = "python-dotenv" },
{ name = "termcolor" },
{ name = "tiktoken" },
]
sdist = { url = "https://files.pythonhosted.org/packages/ee/15/edfbbf217e19ea647225b3ab72a6e3755d2677665f1a7f8e5108da3feabd/ag2-0.9.6.tar.gz", hash = "sha256:d6f7812b1a49654d14113fa3c13ccb593115dee1193744ca428d7178d2b32090", size = 3356270, upload-time = "2025-07-08T14:56:21.63Z" }
wheels = [
@@ -267,7 +267,7 @@ name = "asyncer"
version = "0.0.8"
source = { registry = "https://pypi.org/simple" }
dependencies = [
{ name = "anyio", marker = "python_full_version < '3.13'" },
{ name = "anyio" },
]
sdist = { url = "https://files.pythonhosted.org/packages/ff/67/7ea59c3e69eaeee42e7fc91a5be67ca5849c8979acac2b920249760c6af2/asyncer-0.0.8.tar.gz", hash = "sha256:a589d980f57e20efb07ed91d0dbe67f1d2fd343e7142c66d3a099f05c620739c", size = 18217, upload-time = "2024-08-24T23:15:36.449Z" }
wheels = [
@@ -288,7 +288,7 @@ name = "autogen"
version = "0.9.6"
source = { registry = "https://pypi.org/simple" }
dependencies = [
{ name = "ag2", marker = "python_full_version < '3.13'" },
{ name = "ag2" },
]
sdist = { url = "https://files.pythonhosted.org/packages/67/b9/dc958031b7e08ee50e3d40f5991f4c0bc21538df8d53aa3e9a9f2e2f7818/autogen-0.9.6.tar.gz", hash = "sha256:dc2efbeef61002608983afb120e62f8a109815eb741bcbc9ef398dcff7424a30", size = 43422, upload-time = "2025-07-08T14:56:17.6Z" }
wheels = [
@@ -914,9 +914,9 @@ name = "docker"
version = "7.1.0"
source = { registry = "https://pypi.org/simple" }
dependencies = [
{ name = "pywin32", marker = "python_full_version < '3.13' and sys_platform == 'win32'" },
{ name = "requests", marker = "python_full_version < '3.13'" },
{ name = "urllib3", marker = "python_full_version < '3.13'" },
{ name = "pywin32", marker = "sys_platform == 'win32'" },
{ name = "requests" },
{ name = "urllib3" },
]
sdist = { url = "https://files.pythonhosted.org/packages/91/9b/4a2ea29aeba62471211598dac5d96825bb49348fa07e906ea930394a83ce/docker-7.1.0.tar.gz", hash = "sha256:ad8c70e6e3f8926cb8a92619b832b4ea5299e2831c14284663184e200546fa6c", size = 117834, upload-time = "2024-05-23T11:13:57.216Z" }
wheels = [
@@ -2337,7 +2337,7 @@ wheels = [
[[package]]
name = "langgraph"
version = "0.6.0a1"
version = "0.5.2"
source = { editable = "../libs/langgraph" }
dependencies = [
{ name = "langchain-core" },
@@ -2365,7 +2365,7 @@ dev = [
{ name = "langgraph-checkpoint", editable = "../libs/checkpoint" },
{ name = "langgraph-checkpoint-postgres", editable = "../libs/checkpoint-postgres" },
{ name = "langgraph-checkpoint-sqlite", editable = "../libs/checkpoint-sqlite" },
{ name = "langgraph-cli", extras = ["inmem"], editable = "../libs/cli" },
{ name = "langgraph-cli", extras = ["inmem"] },
{ name = "langgraph-prebuilt", editable = "../libs/prebuilt" },
{ name = "langgraph-sdk", editable = "../libs/sdk-py" },
{ name = "mypy" },
@@ -2388,7 +2388,7 @@ dev = [
[[package]]
name = "langgraph-checkpoint"
version = "2.1.1"
version = "2.1.0"
source = { editable = "../libs/checkpoint" }
dependencies = [
{ name = "langchain-core" },
@@ -2433,7 +2433,7 @@ wheels = [
[[package]]
name = "langgraph-checkpoint-postgres"
version = "2.0.23"
version = "2.0.21"
source = { editable = "../libs/checkpoint-postgres" }
dependencies = [
{ name = "langgraph-checkpoint" },
@@ -2674,7 +2674,7 @@ dev = [
[[package]]
name = "langgraph-sdk"
version = "0.2.0a1"
version = "0.1.72"
source = { editable = "../libs/sdk-py" }
dependencies = [
{ name = "httpx" },
@@ -154,7 +154,7 @@
"id": "2dff2209-44c7-4e2c-b607-ba6675f9e45f",
"metadata": {},
"outputs": [],
"source": ["from langgraph.checkpoint.memory import InMemorySaver\nfrom langgraph.graph import END, StateGraph, START\n\nbuilder = StateGraph(GraphState)\n\n# Define the nodes\nbuilder.add_node(\"generate\", generate) # generation solution\nbuilder.add_node(\"check_code\", code_check) # check code\n\n# Build graph\nbuilder.add_edge(START, \"generate\")\nbuilder.add_edge(\"generate\", \"check_code\")\nbuilder.add_conditional_edges(\n \"check_code\",\n decide_to_finish,\n {\n \"end\": END,\n \"generate\": \"generate\",\n },\n)\n\nmemory = InMemorySaver()\ngraph = builder.compile(checkpointer=memory)"]
"source": ["from langgraph.checkpoint.memory import MemorySaver\nfrom langgraph.graph import END, StateGraph, START\n\nbuilder = StateGraph(GraphState)\n\n# Define the nodes\nbuilder.add_node(\"generate\", generate) # generation solution\nbuilder.add_node(\"check_code\", code_check) # check code\n\n# Build graph\nbuilder.add_edge(START, \"generate\")\nbuilder.add_edge(\"generate\", \"check_code\")\nbuilder.add_conditional_edges(\n \"check_code\",\n decide_to_finish,\n {\n \"end\": END,\n \"generate\": \"generate\",\n },\n)\n\nmemory = MemorySaver()\ngraph = builder.compile(checkpointer=memory)"]
},
{
"cell_type": "code",
@@ -284,9 +284,11 @@ class PostgresSaver(BasePostgresSaver):
configurable = config["configurable"].copy()
thread_id = configurable.pop("thread_id")
checkpoint_ns = configurable.pop("checkpoint_ns")
checkpoint_id = configurable.pop("checkpoint_id", None)
checkpoint_id = configurable.pop(
"checkpoint_id", configurable.pop("thread_ts", None)
)
copy = checkpoint.copy()
copy["channel_values"] = copy["channel_values"].copy()
next_config = {
"configurable": {
"thread_id": thread_id,
@@ -295,28 +297,16 @@ class PostgresSaver(BasePostgresSaver):
}
}
# inline primitive values in checkpoint table
# others are stored in blobs table
blob_values = {}
for k, v in checkpoint["channel_values"].items():
if v is None or isinstance(v, (str, int, float, bool)):
pass
else:
blob_values[k] = copy["channel_values"].pop(k)
with self._cursor(pipeline=True) as cur:
if blob_versions := {
k: v for k, v in new_versions.items() if k in blob_values
}:
cur.executemany(
self.UPSERT_CHECKPOINT_BLOBS_SQL,
self._dump_blobs(
thread_id,
checkpoint_ns,
blob_values,
blob_versions,
),
)
cur.executemany(
self.UPSERT_CHECKPOINT_BLOBS_SQL,
self._dump_blobs(
thread_id,
checkpoint_ns,
copy.pop("channel_values"), # type: ignore[misc]
new_versions,
),
)
cur.execute(
self.UPSERT_CHECKPOINTS_SQL,
(
@@ -449,10 +439,7 @@ class PostgresSaver(BasePostgresSaver):
},
{
**value["checkpoint"],
"channel_values": {
**value["checkpoint"].get("channel_values"),
**self._load_blobs(value["channel_values"]),
},
"channel_values": self._load_blobs(value["channel_values"]),
},
value["metadata"],
(
@@ -240,10 +240,11 @@ class AsyncPostgresSaver(BasePostgresSaver):
configurable = config["configurable"].copy()
thread_id = configurable.pop("thread_id")
checkpoint_ns = configurable.pop("checkpoint_ns")
checkpoint_id = configurable.pop("checkpoint_id", None)
checkpoint_id = configurable.pop(
"checkpoint_id", configurable.pop("thread_ts", None)
)
copy = checkpoint.copy()
copy["channel_values"] = copy["channel_values"].copy()
next_config = {
"configurable": {
"thread_id": thread_id,
@@ -252,29 +253,17 @@ class AsyncPostgresSaver(BasePostgresSaver):
}
}
# inline primitive values in checkpoint table
# others are stored in blobs table
blob_values = {}
for k, v in checkpoint["channel_values"].items():
if v is None or isinstance(v, (str, int, float, bool)):
pass
else:
blob_values[k] = copy["channel_values"].pop(k)
async with self._cursor(pipeline=True) as cur:
if blob_versions := {
k: v for k, v in new_versions.items() if k in blob_values
}:
await cur.executemany(
self.UPSERT_CHECKPOINT_BLOBS_SQL,
await asyncio.to_thread(
self._dump_blobs,
thread_id,
checkpoint_ns,
blob_values,
blob_versions,
),
)
await cur.executemany(
self.UPSERT_CHECKPOINT_BLOBS_SQL,
await asyncio.to_thread(
self._dump_blobs,
thread_id,
checkpoint_ns,
copy.pop("channel_values"), # type: ignore[misc]
new_versions,
),
)
await cur.execute(
self.UPSERT_CHECKPOINTS_SQL,
(
@@ -408,10 +397,7 @@ class AsyncPostgresSaver(BasePostgresSaver):
},
{
**value["checkpoint"],
"channel_values": {
**value["checkpoint"].get("channel_values"),
**self._load_blobs(value["channel_values"]),
},
"channel_values": self._load_blobs(value["channel_values"]),
},
value["metadata"],
(
@@ -191,7 +191,7 @@ class ShallowPostgresSaver(BasePostgresSaver):
) -> None:
warnings.warn(
"ShallowPostgresSaver is deprecated as of version 2.0.20 and will be removed in 3.0.0. "
"Use PostgresSaver instead, and invoke the graph with `graph.invoke(..., durability='exit')`.",
"Use PostgresSaver instead, and invoke the graph with `graph.invoke(..., checkpoint_during=False)`.",
DeprecationWarning,
stacklevel=2,
)
@@ -547,7 +547,7 @@ class AsyncShallowPostgresSaver(BasePostgresSaver):
) -> None:
warnings.warn(
"AsyncShallowPostgresSaver is deprecated as of version 2.0.20 and will be removed in 3.0.0. "
"Use AsyncPostgresSaver instead, and invoke the graph with `await graph.ainvoke(..., durability='exit')`.",
"Use AsyncPostgresSaver instead, and invoke the graph with `await graph.ainvoke(..., checkpoint_during=False)`.",
DeprecationWarning,
stacklevel=2,
)
+1 -1
View File
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
[project]
name = "langgraph-checkpoint-postgres"
version = "2.0.23"
version = "2.0.22"
description = "Library with a Postgres implementation of LangGraph checkpoint saver."
authors = []
requires-python = ">=3.9"
+2 -1
View File
@@ -161,7 +161,8 @@ def test_data():
config_1: RunnableConfig = {
"configurable": {
"thread_id": "thread-1",
"checkpoint_id": "1",
# for backwards compatibility testing
"thread_ts": "1",
"checkpoint_ns": "",
}
}
+2 -1
View File
@@ -143,7 +143,8 @@ def test_data():
config_1: RunnableConfig = {
"configurable": {
"thread_id": "thread-1",
"checkpoint_id": "1",
# for backwards compatibility testing
"thread_ts": "1",
"checkpoint_ns": "",
}
}
+2 -2
View File
@@ -304,7 +304,7 @@ wheels = [
[[package]]
name = "langgraph-checkpoint"
version = "2.1.1"
version = "2.1.0"
source = { editable = "../checkpoint" }
dependencies = [
{ name = "langchain-core" },
@@ -334,7 +334,7 @@ dev = [
[[package]]
name = "langgraph-checkpoint-postgres"
version = "2.0.23"
version = "2.0.22"
source = { editable = "." }
dependencies = [
{ name = "langgraph-checkpoint" },
@@ -29,7 +29,7 @@ _AIO_ERROR_MSG = (
"from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver\n"
"Note: AsyncSqliteSaver requires the aiosqlite package to use.\n"
"Install with:\n`pip install aiosqlite`\n"
"See https://langchain-ai.github.io/langgraph/reference/checkpoints/#langgraph.checkpoint.sqlite.aio.AsyncSqliteSaver"
"See https://langchain-ai.github.io/langgraph/reference/checkpoints/asyncsqlitesaver"
"for more information."
)
@@ -19,7 +19,8 @@ class TestAsyncSqliteSaver:
self.config_1: RunnableConfig = {
"configurable": {
"thread_id": "thread-1",
"checkpoint_id": "1",
# for backwards compatibility testing
"thread_ts": "1",
"checkpoint_ns": "",
}
}
+1 -1
View File
@@ -21,7 +21,7 @@ class TestSqliteSaver:
"configurable": {
"thread_id": "thread-1",
# for backwards compatibility testing
"checkpoint_id": "1",
"thread_ts": "1",
"checkpoint_ns": "",
}
}
+1 -1
View File
@@ -316,7 +316,7 @@ wheels = [
[[package]]
name = "langgraph-checkpoint"
version = "2.1.1"
version = "2.1.0"
source = { editable = "../checkpoint" }
dependencies = [
{ name = "langchain-core" },
+3 -3
View File
@@ -36,7 +36,7 @@ Each checkpointer should conform to `langgraph.checkpoint.base.BaseCheckpointSav
- `.put` - Store a checkpoint with its configuration and metadata.
- `.put_writes` - Store intermediate writes linked to a checkpoint (i.e. pending writes).
- `.get_tuple` - Fetch a checkpoint tuple using for a given configuration (`thread_id` and `checkpoint_id`).
- `.get_tuple` - Fetch a checkpoint tuple using for a given configuration (`thread_id` and `thread_ts`).
- `.list` - List checkpoints that match a given configuration and filter criteria.
If the checkpointer will be used with asynchronous graph execution (i.e. executing the graph via `.ainvoke`, `.astream`, `.abatch`), checkpointer must implement asynchronous versions of the above methods (`.aput`, `.aput_writes`, `.aget_tuple`, `.alist`).
@@ -44,12 +44,12 @@ If the checkpointer will be used with asynchronous graph execution (i.e. executi
## Usage
```python
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
write_config = {"configurable": {"thread_id": "1", "checkpoint_ns": ""}}
read_config = {"configurable": {"thread_id": "1"}}
checkpointer = InMemorySaver()
checkpointer = MemorySaver()
checkpoint = {
"v": 4,
"ts": "2024-07-31T20:14:19.804150+00:00",
@@ -375,8 +375,10 @@ class EmptyChannelError(Exception):
def get_checkpoint_id(config: RunnableConfig) -> str | None:
"""Get checkpoint ID."""
return config["configurable"].get("checkpoint_id")
"""Get checkpoint ID in a backwards-compatible manner (fallback on thread_ts)."""
return config["configurable"].get(
"checkpoint_id", config["configurable"].get("thread_ts")
)
def get_checkpoint_metadata(
@@ -411,6 +413,7 @@ WRITES_IDX_MAP = {ERROR: -1, SCHEDULED: -2, INTERRUPT: -3, RESUME: -4}
EXCLUDED_METADATA_KEYS = {
"thread_id",
"thread_ts",
"checkpoint_id",
"checkpoint_ns",
"checkpoint_map",
@@ -343,14 +343,10 @@ async def _run(
# set the results of each operation
for fut, result in zip(futs, results):
# guard against future being done (e.g. cancelled)
if not fut.done():
fut.set_result(result)
fut.set_result(result)
except Exception as e:
for fut in futs:
# guard against future being done (e.g. cancelled)
if not fut.done():
fut.set_exception(e)
fut.set_exception(e)
finally:
# remove strong ref to store
del s
+1 -1
View File
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
[project]
name = "langgraph-checkpoint"
version = "2.1.1"
version = "2.1.0"
description = "Library with base interfaces for LangGraph checkpoint savers."
authors = []
requires-python = ">=3.9"
+4 -3
View File
@@ -22,7 +22,8 @@ class TestMemorySaver:
"configurable": {
"thread_id": "thread-1",
"checkpoint_ns": "",
"checkpoint_id": "1",
# for backwards compatibility testing
"thread_ts": "1",
}
}
self.config_2: RunnableConfig = {
@@ -189,6 +190,6 @@ class TestMemorySaver:
def test_memory_saver() -> None:
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
assert isinstance(InMemorySaver(), InMemorySaver)
assert isinstance(MemorySaver(), InMemorySaver)
-37
View File
@@ -155,43 +155,6 @@ async def test_async_batch_store(mocker: MockerFixture) -> None:
]
async def test_async_batch_store_handles_cancellation() -> None:
class MockStore(AsyncBatchedBaseStore):
def batch(self, ops: Iterable[Op]) -> list[Result]:
raise NotImplementedError
async def abatch(self, ops: Iterable[Op]) -> list[Result]:
assert all(isinstance(op, GetOp) for op in ops)
return [
Item(
value={},
key=getattr(op, "key", ""),
namespace=getattr(op, "namespace", ()),
created_at=datetime(2024, 9, 24, 17, 29, 10, 128397),
updated_at=datetime(2024, 9, 24, 17, 29, 10, 128397),
)
for op in ops
]
store = MockStore()
# Simulate cancellation
task = asyncio.create_task(store.aget(namespace=("a",), key="b"))
await asyncio.sleep(0)
task.cancel()
await asyncio.sleep(0)
# Cancelling individual queries against the store should not break the store
result = await store.aget(namespace=("c",), key="d")
assert result == Item(
value={},
key="d",
namespace=("c",),
created_at=datetime(2024, 9, 24, 17, 29, 10, 128397),
updated_at=datetime(2024, 9, 24, 17, 29, 10, 128397),
)
def test_list_namespaces_basic() -> None:
store = InMemoryStore()
+1 -1
View File
@@ -323,7 +323,7 @@ wheels = [
[[package]]
name = "langgraph-checkpoint"
version = "2.1.1"
version = "2.1.0"
source = { editable = "." }
dependencies = [
{ name = "langchain-core" },
+2 -2
View File
@@ -49,12 +49,12 @@ def call_model(state, config):
tool_node = ToolNode(tools)
class ContextSchema(TypedDict):
class ConfigSchema(TypedDict):
model: Literal["anthropic", "openai"]
# Define a new graph
workflow = StateGraph(AgentState, context_schema=ContextSchema)
workflow = StateGraph(AgentState, config_schema=ConfigSchema)
# Define the two nodes we will cycle between
workflow.add_node("agent", call_model)
+2 -2
View File
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
[project]
name = "langgraph-cli"
version = "0.3.5"
version = "0.3.4"
description = "CLI for interacting with LangGraph API"
authors = []
requires-python = ">=3.9"
@@ -19,7 +19,7 @@ dependencies = [
[project.optional-dependencies]
inmem = [
"langgraph-api>=0.2.67,<0.3.0 ; python_version >= '3.11'",
"langgraph-runtime-inmem>=0.6.0 ; python_version >= '3.11'",
"langgraph-runtime-inmem>=0.3.0,<0.4.0 ; python_version >= '3.11'",
"python-dotenv>=0.8.0",
]
+160 -170
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version = "0.3.68"
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version = "0.5.2"
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[[package]]
+2 -2
View File
@@ -73,7 +73,7 @@ While LangGraph can be used standalone, it also integrates seamlessly with any L
- [Guides](https://langchain-ai.github.io/langgraph/how-tos/): Quick, actionable code snippets for topics such as streaming, adding memory & persistence, and design patterns (e.g. branching, subgraphs, etc.).
- [Reference](https://langchain-ai.github.io/langgraph/reference/graphs/): Detailed reference on core classes, methods, how to use the graph and checkpointing APIs, and higher-level prebuilt components.
- [Examples](https://langchain-ai.github.io/langgraph/examples/): Guided examples on getting started with LangGraph.
- [Examples](https://langchain-ai.github.io/langgraph/tutorials/overview/): Guided examples on getting started with LangGraph.
- [LangChain Forum](https://forum.langchain.com/): Connect with the community and share all of your technical questions, ideas, and feedback.
- [LangChain Academy](https://academy.langchain.com/courses/intro-to-langgraph): Learn the basics of LangGraph in our free, structured course.
- [Templates](https://langchain-ai.github.io/langgraph/concepts/template_applications/): Pre-built reference apps for common agentic workflows (e.g. ReAct agent, memory, retrieval etc.) that can be cloned and adapted.
@@ -81,4 +81,4 @@ While LangGraph can be used standalone, it also integrates seamlessly with any L
## Acknowledgements
LangGraph is inspired by [Pregel](https://research.google/pubs/pub37252/) and [Apache Beam](https://beam.apache.org/). The public interface draws inspiration from [NetworkX](https://networkx.org/documentation/latest/). LangGraph is built by LangChain Inc, the creators of LangChain, but can be used without LangChain.
LangGraph is inspired by [Pregel](https://research.google/pubs/pub37252/) and [Apache Beam](https://beam.apache.org/). The public interface draws inspiration from [NetworkX](https://networkx.org/documentation/latest/). LangGraph is built by LangChain Inc, the creators of LangChain, but can be used without LangChain.
+31 -31
View File
@@ -11,7 +11,7 @@ from bench.react_agent import react_agent
from bench.sequential import create_sequential
from bench.wide_dict import wide_dict
from bench.wide_state import wide_state
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
from langgraph.graph import StateGraph
from langgraph.pregel import Pregel
@@ -26,7 +26,7 @@ async def arun(graph: Pregel, input: dict):
"configurable": {"thread_id": str(uuid4())},
"recursion_limit": 1000000000,
},
durability="exit",
checkpoint_during=False,
)
]
)
@@ -43,7 +43,7 @@ async def arun_first_event_latency(graph: Pregel, input: dict) -> None:
"configurable": {"thread_id": str(uuid4())},
"recursion_limit": 1000000000,
},
durability="exit",
checkpoint_during=False,
)
try:
@@ -63,7 +63,7 @@ def run(graph: Pregel, input: dict):
"configurable": {"thread_id": str(uuid4())},
"recursion_limit": 1000000000,
},
durability="exit",
checkpoint_during=False,
)
]
)
@@ -80,7 +80,7 @@ def run_first_event_latency(graph: Pregel, input: dict) -> None:
"configurable": {"thread_id": str(uuid4())},
"recursion_limit": 1000000000,
},
durability="exit",
checkpoint_during=False,
)
try:
@@ -108,8 +108,8 @@ benchmarks = (
),
(
"fanout_to_subgraph_10x_checkpoint",
fanout_to_subgraph().compile(checkpointer=InMemorySaver()),
fanout_to_subgraph_sync().compile(checkpointer=InMemorySaver()),
fanout_to_subgraph().compile(checkpointer=MemorySaver()),
fanout_to_subgraph_sync().compile(checkpointer=MemorySaver()),
{
"subjects": [
random.choices("abcdefghijklmnopqrstuvwxyz", k=1000) for _ in range(10)
@@ -128,8 +128,8 @@ benchmarks = (
),
(
"fanout_to_subgraph_100x_checkpoint",
fanout_to_subgraph().compile(checkpointer=InMemorySaver()),
fanout_to_subgraph_sync().compile(checkpointer=InMemorySaver()),
fanout_to_subgraph().compile(checkpointer=MemorySaver()),
fanout_to_subgraph_sync().compile(checkpointer=MemorySaver()),
{
"subjects": [
random.choices("abcdefghijklmnopqrstuvwxyz", k=1000) for _ in range(100)
@@ -144,8 +144,8 @@ benchmarks = (
),
(
"react_agent_10x_checkpoint",
react_agent(10, checkpointer=InMemorySaver()),
react_agent(10, checkpointer=InMemorySaver()),
react_agent(10, checkpointer=MemorySaver()),
react_agent(10, checkpointer=MemorySaver()),
{"messages": [HumanMessage("hi?")]},
),
(
@@ -156,8 +156,8 @@ benchmarks = (
),
(
"react_agent_100x_checkpoint",
react_agent(100, checkpointer=InMemorySaver()),
react_agent(100, checkpointer=InMemorySaver()),
react_agent(100, checkpointer=MemorySaver()),
react_agent(100, checkpointer=MemorySaver()),
{"messages": [HumanMessage("hi?")]},
),
(
@@ -178,8 +178,8 @@ benchmarks = (
),
(
"wide_state_25x300_checkpoint",
wide_state(300).compile(checkpointer=InMemorySaver()),
wide_state(300).compile(checkpointer=InMemorySaver()),
wide_state(300).compile(checkpointer=MemorySaver()),
wide_state(300).compile(checkpointer=MemorySaver()),
{
"messages": [
{
@@ -210,8 +210,8 @@ benchmarks = (
),
(
"wide_state_15x600_checkpoint",
wide_state(600).compile(checkpointer=InMemorySaver()),
wide_state(600).compile(checkpointer=InMemorySaver()),
wide_state(600).compile(checkpointer=MemorySaver()),
wide_state(600).compile(checkpointer=MemorySaver()),
{
"messages": [
{
@@ -242,8 +242,8 @@ benchmarks = (
),
(
"wide_state_9x1200_checkpoint",
wide_state(1200).compile(checkpointer=InMemorySaver()),
wide_state(1200).compile(checkpointer=InMemorySaver()),
wide_state(1200).compile(checkpointer=MemorySaver()),
wide_state(1200).compile(checkpointer=MemorySaver()),
{
"messages": [
{
@@ -274,8 +274,8 @@ benchmarks = (
),
(
"wide_dict_25x300_checkpoint",
wide_dict(300).compile(checkpointer=InMemorySaver()),
wide_dict(300).compile(checkpointer=InMemorySaver()),
wide_dict(300).compile(checkpointer=MemorySaver()),
wide_dict(300).compile(checkpointer=MemorySaver()),
{
"messages": [
{
@@ -306,8 +306,8 @@ benchmarks = (
),
(
"wide_dict_15x600_checkpoint",
wide_dict(600).compile(checkpointer=InMemorySaver()),
wide_dict(600).compile(checkpointer=InMemorySaver()),
wide_dict(600).compile(checkpointer=MemorySaver()),
wide_dict(600).compile(checkpointer=MemorySaver()),
{
"messages": [
{
@@ -338,8 +338,8 @@ benchmarks = (
),
(
"wide_dict_9x1200_checkpoint",
wide_dict(1200).compile(checkpointer=InMemorySaver()),
wide_dict(1200).compile(checkpointer=InMemorySaver()),
wide_dict(1200).compile(checkpointer=MemorySaver()),
wide_dict(1200).compile(checkpointer=MemorySaver()),
{
"messages": [
{
@@ -382,8 +382,8 @@ benchmarks = (
),
(
"pydantic_state_25x300_checkpoint",
pydantic_state(300).compile(checkpointer=InMemorySaver()),
pydantic_state(300).compile(checkpointer=InMemorySaver()),
pydantic_state(300).compile(checkpointer=MemorySaver()),
pydantic_state(300).compile(checkpointer=MemorySaver()),
{
"messages": [
{
@@ -414,8 +414,8 @@ benchmarks = (
),
(
"pydantic_state_15x600_checkpoint",
pydantic_state(600).compile(checkpointer=InMemorySaver()),
pydantic_state(600).compile(checkpointer=InMemorySaver()),
pydantic_state(600).compile(checkpointer=MemorySaver()),
pydantic_state(600).compile(checkpointer=MemorySaver()),
{
"messages": [
{
@@ -446,8 +446,8 @@ benchmarks = (
),
(
"pydantic_state_9x1200_checkpoint",
pydantic_state(1200).compile(checkpointer=InMemorySaver()),
pydantic_state(1200).compile(checkpointer=InMemorySaver()),
pydantic_state(1200).compile(checkpointer=MemorySaver()),
pydantic_state(1200).compile(checkpointer=MemorySaver()),
{
"messages": [
{
+3 -4
View File
@@ -3,9 +3,8 @@ from typing import Annotated
from typing_extensions import TypedDict
from langgraph.constants import END, START
from langgraph.constants import END, START, Send
from langgraph.graph.state import StateGraph
from langgraph.types import Send
def fanout_to_subgraph() -> StateGraph:
@@ -115,9 +114,9 @@ if __name__ == "__main__":
import uvloop
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
graph = fanout_to_subgraph().compile(checkpointer=InMemorySaver())
graph = fanout_to_subgraph().compile(checkpointer=MemorySaver())
input = {
"subjects": [
random.choices("abcdefghijklmnopqrstuvwxyz", k=1000) for _ in range(1000)
+2 -2
View File
@@ -304,9 +304,9 @@ if __name__ == "__main__":
import uvloop
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
graph = pydantic_state(1000).compile(checkpointer=InMemorySaver())
graph = pydantic_state(1000).compile(checkpointer=MemorySaver())
input = {
"messages": [
{
+2 -2
View File
@@ -68,9 +68,9 @@ if __name__ == "__main__":
import uvloop
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
graph = react_agent(100, checkpointer=InMemorySaver())
graph = react_agent(100, checkpointer=MemorySaver())
input = {"messages": [HumanMessage("hi?")]}
config = {"configurable": {"thread_id": "1"}, "recursion_limit": 20000000000}
+1 -1
View File
@@ -1,7 +1,7 @@
"""Create a sequential no-op graph consisting of a few hundred nodes."""
from langgraph._internal._runnable import RunnableCallable
from langgraph.graph import MessagesState, StateGraph
from langgraph.utils.runnable import RunnableCallable
def create_sequential(number_nodes: int) -> StateGraph:
+2 -2
View File
@@ -130,9 +130,9 @@ if __name__ == "__main__":
import uvloop
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
graph = wide_dict(1000).compile(checkpointer=InMemorySaver())
graph = wide_dict(1000).compile(checkpointer=MemorySaver())
input = {
"messages": [
{
+2 -2
View File
@@ -140,9 +140,9 @@ if __name__ == "__main__":
import uvloop
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.checkpoint.memory import MemorySaver
graph = wide_state(1000).compile(checkpointer=InMemorySaver())
graph = wide_state(1000).compile(checkpointer=MemorySaver())
input = {
"messages": [
{
@@ -1,4 +0,0 @@
"""Internal modules for LangGraph.
This module is not part of the public API, and thus stability is not guaranteed.
"""
@@ -1,110 +0,0 @@
"""Constants used for Pregel operations."""
import sys
from typing import Literal, cast
# --- Reserved write keys ---
INPUT = sys.intern("__input__")
# for values passed as input to the graph
INTERRUPT = sys.intern("__interrupt__")
# for dynamic interrupts raised by nodes
RESUME = sys.intern("__resume__")
# for values passed to resume a node after an interrupt
ERROR = sys.intern("__error__")
# for errors raised by nodes
NO_WRITES = sys.intern("__no_writes__")
# marker to signal node didn't write anything
TASKS = sys.intern("__pregel_tasks")
# for Send objects returned by nodes/edges, corresponds to PUSH below
RETURN = sys.intern("__return__")
# for writes of a task where we simply record the return value
PREVIOUS = sys.intern("__previous__")
# the implicit branch that handles each node's Control values
# --- Reserved cache namespaces ---
CACHE_NS_WRITES = sys.intern("__pregel_ns_writes")
# cache namespace for node writes
# --- Reserved config.configurable keys ---
CONFIG_KEY_SEND = sys.intern("__pregel_send")
# holds the `write` function that accepts writes to state/edges/reserved keys
CONFIG_KEY_READ = sys.intern("__pregel_read")
# holds the `read` function that returns a copy of the current state
CONFIG_KEY_CALL = sys.intern("__pregel_call")
# holds the `call` function that accepts a node/func, args and returns a future
CONFIG_KEY_CHECKPOINTER = sys.intern("__pregel_checkpointer")
# holds a `BaseCheckpointSaver` passed from parent graph to child graphs
CONFIG_KEY_STREAM = sys.intern("__pregel_stream")
# holds a `StreamProtocol` passed from parent graph to child graphs
CONFIG_KEY_CACHE = sys.intern("__pregel_cache")
# holds a `BaseCache` made available to subgraphs
CONFIG_KEY_RESUMING = sys.intern("__pregel_resuming")
# holds a boolean indicating if subgraphs should resume from a previous checkpoint
CONFIG_KEY_TASK_ID = sys.intern("__pregel_task_id")
# holds the task ID for the current task
CONFIG_KEY_THREAD_ID = sys.intern("thread_id")
# holds the thread ID for the current invocation
CONFIG_KEY_CHECKPOINT_MAP = sys.intern("checkpoint_map")
# holds a mapping of checkpoint_ns -> checkpoint_id for parent graphs
CONFIG_KEY_CHECKPOINT_ID = sys.intern("checkpoint_id")
# holds the current checkpoint_id, if any
CONFIG_KEY_CHECKPOINT_NS = sys.intern("checkpoint_ns")
# holds the current checkpoint_ns, "" for root graph
CONFIG_KEY_NODE_FINISHED = sys.intern("__pregel_node_finished")
# holds a callback to be called when a node is finished
CONFIG_KEY_SCRATCHPAD = sys.intern("__pregel_scratchpad")
# holds a mutable dict for temporary storage scoped to the current task
CONFIG_KEY_RUNNER_SUBMIT = sys.intern("__pregel_runner_submit")
# holds a function that receives tasks from runner, executes them and returns results
CONFIG_KEY_DURABILITY = sys.intern("__pregel_durability")
# holds the durability mode, one of "sync", "async", or "exit"
CONFIG_KEY_RUNTIME = sys.intern("__pregel_runtime")
# holds a `Runtime` instance with context, store, stream writer, etc.
CONFIG_KEY_RESUME_MAP = sys.intern("__pregel_resume_map")
# holds a mapping of task ns -> resume value for resuming tasks
# --- Other constants ---
PUSH = sys.intern("__pregel_push")
# denotes push-style tasks, ie. those created by Send objects
PULL = sys.intern("__pregel_pull")
# denotes pull-style tasks, ie. those triggered by edges
NS_SEP = sys.intern("|")
# for checkpoint_ns, separates each level (ie. graph|subgraph|subsubgraph)
NS_END = sys.intern(":")
# for checkpoint_ns, for each level, separates the namespace from the task_id
CONF = cast(Literal["configurable"], sys.intern("configurable"))
# key for the configurable dict in RunnableConfig
NULL_TASK_ID = sys.intern("00000000-0000-0000-0000-000000000000")
# the task_id to use for writes that are not associated with a task
# redefined to avoid circular import with langgraph.constants
_TAG_HIDDEN = sys.intern("langsmith:hidden")
RESERVED = {
_TAG_HIDDEN,
# reserved write keys
INPUT,
INTERRUPT,
RESUME,
ERROR,
NO_WRITES,
# reserved config.configurable keys
CONFIG_KEY_SEND,
CONFIG_KEY_READ,
CONFIG_KEY_CHECKPOINTER,
CONFIG_KEY_STREAM,
CONFIG_KEY_CHECKPOINT_MAP,
CONFIG_KEY_RESUMING,
CONFIG_KEY_TASK_ID,
CONFIG_KEY_CHECKPOINT_MAP,
CONFIG_KEY_CHECKPOINT_ID,
CONFIG_KEY_CHECKPOINT_NS,
CONFIG_KEY_RESUME_MAP,
# other constants
PUSH,
PULL,
NS_SEP,
NS_END,
CONF,
}
@@ -1,29 +0,0 @@
def default_retry_on(exc: Exception) -> bool:
import httpx
import requests
if isinstance(exc, ConnectionError):
return True
if isinstance(exc, httpx.HTTPStatusError):
return 500 <= exc.response.status_code < 600
if isinstance(exc, requests.HTTPError):
return 500 <= exc.response.status_code < 600 if exc.response else True
if isinstance(
exc,
(
ValueError,
TypeError,
ArithmeticError,
ImportError,
LookupError,
NameError,
SyntaxError,
RuntimeError,
ReferenceError,
StopIteration,
StopAsyncIteration,
OSError,
),
):
return False
return True
@@ -42,13 +42,13 @@ It can either be a `TypedDict`, `dataclass`, or Pydantic `BaseModel`.
Note: we cannot use either `TypedDict` or `dataclass` directly due to limitations in type checking.
"""
MISSING = object()
"""Unset sentinel value."""
class Unset:
"""A sentinel value to represent an unset type."""
UNSET: Unset = Unset()
class DeprecatedKwargs(TypedDict):
"""TypedDict to use for extra keyword arguments, enabling type checking warnings for deprecated arguments."""
EMPTY_SEQ: tuple[str, ...] = tuple()
"""An empty sequence of strings."""
+6 -18
View File
@@ -1,27 +1,15 @@
from langgraph.channels.any_value import AnyValue
from langgraph.channels.base import BaseChannel
from langgraph.channels.binop import BinaryOperatorAggregate
from langgraph.channels.ephemeral_value import EphemeralValue
from langgraph.channels.last_value import LastValue, LastValueAfterFinish
from langgraph.channels.named_barrier_value import (
NamedBarrierValue,
NamedBarrierValueAfterFinish,
)
from langgraph.channels.last_value import LastValue
from langgraph.channels.topic import Topic
from langgraph.channels.untracked_value import UntrackedValue
__all__ = (
# base
"BaseChannel",
# value types
"AnyValue",
__all__ = [
"LastValue",
"LastValueAfterFinish",
"Topic",
"BinaryOperatorAggregate",
"UntrackedValue",
"EphemeralValue",
"BinaryOperatorAggregate",
"NamedBarrierValue",
"NamedBarrierValueAfterFinish",
# topics
"Topic",
)
"AnyValue",
]
@@ -1,16 +1,12 @@
from __future__ import annotations
from collections.abc import Sequence
from typing import Any, Generic
from typing_extensions import Self
from langgraph._internal._typing import MISSING
from langgraph.channels.base import BaseChannel, Value
from langgraph.constants import MISSING
from langgraph.errors import EmptyChannelError
__all__ = ("AnyValue",)
class AnyValue(Generic[Value], BaseChannel[Value, Value, Value]):
"""Stores the last value received, assumes that if multiple values are
@@ -18,8 +14,6 @@ class AnyValue(Generic[Value], BaseChannel[Value, Value, Value]):
__slots__ = ("typ", "value")
value: Value | Any
def __init__(self, typ: Any, key: str = "") -> None:
super().__init__(typ, key)
self.value = MISSING
+13 -10
View File
@@ -1,22 +1,18 @@
from __future__ import annotations
from abc import ABC, abstractmethod
from collections.abc import Sequence
from typing import Any, Generic, TypeVar
from typing_extensions import Self
from langgraph._internal._typing import MISSING
from langgraph.errors import EmptyChannelError
from langgraph.constants import MISSING
from langgraph.errors import EmptyChannelError, InvalidUpdateError
Value = TypeVar("Value")
Update = TypeVar("Update")
Checkpoint = TypeVar("Checkpoint")
__all__ = ("BaseChannel",)
C = TypeVar("C")
class BaseChannel(Generic[Value, Update, Checkpoint], ABC):
class BaseChannel(Generic[Value, Update, C], ABC):
"""Base class for all channels."""
__slots__ = ("key", "typ")
@@ -43,7 +39,7 @@ class BaseChannel(Generic[Value, Update, Checkpoint], ABC):
Subclasses can override this method with a more efficient implementation."""
return self.from_checkpoint(self.checkpoint())
def checkpoint(self) -> Checkpoint | Any:
def checkpoint(self) -> C:
"""Return a serializable representation of the channel's current state.
Raises EmptyChannelError if the channel is empty (never updated yet),
or doesn't support checkpoints."""
@@ -53,7 +49,7 @@ class BaseChannel(Generic[Value, Update, Checkpoint], ABC):
return MISSING
@abstractmethod
def from_checkpoint(self, checkpoint: Checkpoint | Any) -> Self:
def from_checkpoint(self, checkpoint: C) -> Self:
"""Return a new identical channel, optionally initialized from a checkpoint.
If the checkpoint contains complex data structures, they should be copied."""
@@ -103,3 +99,10 @@ class BaseChannel(Generic[Value, Update, Checkpoint], ABC):
Returns True if the channel was updated, False otherwise.
"""
return False
__all__ = [
"BaseChannel",
"EmptyChannelError",
"InvalidUpdateError",
]
+1 -3
View File
@@ -4,12 +4,10 @@ from typing import Callable, Generic
from typing_extensions import NotRequired, Required, Self
from langgraph._internal._typing import MISSING
from langgraph.channels.base import BaseChannel, Value
from langgraph.constants import MISSING
from langgraph.errors import EmptyChannelError
__all__ = ("BinaryOperatorAggregate",)
# Adapted from typing_extensions
def _strip_extras(t): # type: ignore[no-untyped-def]
@@ -1,25 +1,18 @@
from __future__ import annotations
from collections.abc import Sequence
from typing import Any, Generic
from typing_extensions import Self
from langgraph._internal._typing import MISSING
from langgraph.channels.base import BaseChannel, Value
from langgraph.constants import MISSING
from langgraph.errors import EmptyChannelError, InvalidUpdateError
__all__ = ("EphemeralValue",)
class EphemeralValue(Generic[Value], BaseChannel[Value, Value, Value]):
"""Stores the value received in the step immediately preceding, clears after."""
__slots__ = ("value", "guard")
value: Value | Any
guard: bool
def __init__(self, typ: Any, guard: bool = True) -> None:
super().__init__(typ)
self.guard = guard
@@ -1,12 +1,10 @@
from __future__ import annotations
from collections.abc import Sequence
from typing import Any, Generic
from typing_extensions import Self
from langgraph._internal._typing import MISSING
from langgraph.channels.base import BaseChannel, Value
from langgraph.constants import MISSING
from langgraph.errors import (
EmptyChannelError,
ErrorCode,
@@ -14,16 +12,12 @@ from langgraph.errors import (
create_error_message,
)
__all__ = ("LastValue", "LastValueAfterFinish")
class LastValue(Generic[Value], BaseChannel[Value, Value, Value]):
"""Stores the last value received, can receive at most one value per step."""
__slots__ = ("value",)
value: Value | Any
def __init__(self, typ: Any, key: str = "") -> None:
super().__init__(typ, key)
self.value = MISSING
@@ -86,9 +80,6 @@ class LastValueAfterFinish(
__slots__ = ("value", "finished")
value: Value | Any
finished: bool
def __init__(self, typ: Any, key: str = "") -> None:
super().__init__(typ, key)
self.value = MISSING
@@ -107,19 +98,19 @@ class LastValueAfterFinish(
"""The type of the update received by the channel."""
return self.typ
def checkpoint(self) -> tuple[Value | Any, bool] | Any:
def checkpoint(self) -> tuple[Value, bool]:
if self.value is MISSING:
return MISSING
return (self.value, self.finished)
def from_checkpoint(self, checkpoint: tuple[Value | Any, bool] | Any) -> Self:
def from_checkpoint(self, checkpoint: tuple[Value, bool]) -> Self:
empty = self.__class__(self.typ)
empty.key = self.key
if checkpoint is not MISSING:
empty.value, empty.finished = checkpoint
return empty
def update(self, values: Sequence[Value | Any]) -> bool:
def update(self, values: Sequence[Value]) -> bool:
if len(values) == 0:
return False
@@ -3,12 +3,10 @@ from typing import Generic
from typing_extensions import Self
from langgraph._internal._typing import MISSING
from langgraph.channels.base import BaseChannel, Value
from langgraph.constants import MISSING
from langgraph.errors import EmptyChannelError, InvalidUpdateError
__all__ = ("NamedBarrierValue", "NamedBarrierValueAfterFinish")
class NamedBarrierValue(Generic[Value], BaseChannel[Value, Value, set[Value]]):
"""A channel that waits until all named values are received before making the value available."""

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