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Introduction

Quick Start​

Use a Graph as a Subgraph in a new Langgraph app​

Use a Graph on its own​

Human-in-the-Loop​

Overview​

The LMSystems SDK provides two main ways to work with graphs from the LMSystems marketplace:

PurchasedGraph​

Use this when you want to integrate a purchased graph as a subgraph within a new Langgraph application. This is ideal for:

  • Building larger, composite applications that incorporate marketplace graphs as components
  • Direct integration with LangGraph's StateGraph system
  • Full control over graph execution and state management
  • Custom configuration and state value management

LmsystemsClient​

Use this for direct, standalone usage of purchased graphs. Available in both async (LmsystemsClient) and sync (SyncLmsystemsClient) versions, this provides:

  • Simple, high-level interface for graph execution
  • Built-in thread management and state handling
  • Streaming support for real-time updates
  • Automatic error handling and retries
  • Support for interrupted graph resumption
  • Background task management

Key Features​

  • Async/Sync Support: Choose between async and sync clients based on your needs
  • Streaming: Real-time streaming of graph execution results
  • State Management: Sophisticated thread and state management capabilities
  • Error Handling: Comprehensive error handling with custom exceptions
  • Configurability: Flexible configuration options for graphs and execution
  • Interruption Handling: Support for handling and resuming interrupted graph executions

Installation​

pip install lmsystems

Authentication​

To use the SDK, you'll need an LMSystems API key. Get your API key by:

  1. Creating an account at LMSystems
  2. Navigating to your account settings
  3. Generating an API key

Store your API key securely using environment variables:

export LMSYSTEMS_API_KEY="your-api-key"

Or use a .env file with the python-dotenv package:

# .env
LMSYSTEMS_API_KEY="your-api-key"