KAgent LangGraph Integration
This package provides LangGraph integration for KAgent with A2A (Agent-to-Agent) server support. It implements a custom checkpointer that persists LangGraph state to the KAgent REST API, enabling distributed agent execution with session persistence.
Features
- Custom Checkpointer: Persists LangGraph checkpoints to KAgent via REST API
- A2A Server Integration: Compatible with KAgent's Agent-to-Agent protocol
- Session Management: Automatic session creation and state persistence
- Event Streaming: Real-time streaming of graph execution events
- FastAPI Integration: Ready-to-deploy web server for agent execution
Quick Start
from kagent.langgraph import KAgentApp
from langgraph.graph import StateGraph
from langchain_core.messages import BaseMessage
from typing import TypedDict, Annotated, Sequence
class State(TypedDict):
messages: Annotated[Sequence[BaseMessage], "The conversation history"]
# Define your graph
builder = StateGraph(State)
# Add nodes and edges...
# Create KAgent app
app = KAgentApp(
graph_builder=builder,
agent_card={
"name": "my-langgraph-agent",
"description": "A LangGraph agent with KAgent integration",
"version": "0.1.0",
"capabilities": {"streaming": True},
"defaultInputModes": ["text"],
"defaultOutputModes": ["text"]
},
kagent_url="http://localhost:8083",
app_name="my-agent"
)
# Build FastAPI application
fastapi_app = app.build()
Architecture
The package mirrors the structure of kagent-adk but uses LangGraph instead of Google's ADK:
- KAgentCheckpointer: Custom checkpointer that stores graph state in KAgent sessions
- LangGraphAgentExecutor: Executes LangGraph workflows within A2A protocol
- KAgentApp: FastAPI application builder with A2A integration
- Session Management: Automatic session lifecycle management via KAgent REST API
Configuration
The system uses the same REST API endpoints as the ADK integration:
POST /api/sessions- Create new sessionsGET /api/sessions/{id}- Retrieve session and eventsPOST /api/sessions/{id}/events- Append checkpoint eventsPOST /api/tasks- Task management
Deployment
Use the same deployment pattern as kagent-adk samples with Docker and Kubernetes.
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