LangGraph checkpointed resume

This example shows persisted state surviving a pause/resume boundary.

Requirements

• Python 3.10+
• An OpenAI API key set as an environment variable (OPENAI_API_KEY)

Steps for running this example in the shell

1. Install dependencies:

python -m venv .venv

# macOS/Linux:
source .venv/bin/activate

# Windows Command Prompt:
.venv\Scripts\activate.bat

# Windows PowerShell:
.venv\Scripts\Activate.ps1

pip install -r requirements.txt

2. Export your API key as an environment variable:

export OPENAI_API_KEY="sk-..." # Windows cmd: set OPENAI_API_KEY="sk-..." # Windows PowerShell: $env:OPENAI_API_KEY="sk-..."

3. Run the script:

python checkpointed_resume.py

What it demonstrates

• A graph compiled with a checkpointer
• State loaded back by thread id after the first pause
• Final state completed on resume without losing the draft

Output

When you run the script, it will print the results to the terminal.