langgraph-events
Opinionated event-driven abstraction for LangGraph. State IS events.
Quick Start
Group related commands and events into a Namespace; colocate the handler on the command.
from langgraph_events import Command, DomainEvent, EventGraph, Namespace
class Order(Namespace):
class Place(Command):
customer_id: str
class Placed(DomainEvent):
order_id: str
def handle(self) -> Placed:
return Order.Place.Placed(order_id=f"o-{self.customer_id}")
graph = EventGraph([Order.Place])
log = graph.invoke(Order.Place(customer_id="alice"))
print(log.latest(Order.Place.Placed))
@on(...) handlers add invariants, declared exceptions, and cross-namespace reactions. See Concepts and Control Flow.
Installation
pip install langgraph-events
# With AG-UI adapter support
pip install "langgraph-events[agui]"
# From source (development)
pip install git+https://github.com/cadance-io/langgraph-events.git
Documentation
- Docs site (GitHub Pages): https://cadance-io.github.io/langgraph-events/
- Local docs index:
docs/index.md - Getting started:
docs/getting-started.md - Core concepts:
docs/concepts.md - Patterns:
docs/patterns.md - Reflection (agent-queryable event log):
docs/reflection.md - API reference:
docs/api.md - AG-UI adapter:
docs/agui.md - Checkpointer and graph evolution:
docs/checkpointer-evolution.md
Development
uv sync --group dev
uv run pytest tests/
uv run ruff check src/ tests/
uv run mypy src/
License
MIT - see LICENSE.
1 maintainer
Metadata
1 maintainer
Release files for langgraph-events 0.28.0
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