Research
The host, the checkpoint, and the loop after a failure.
Notes from the Linea team on executing the graph, holding the input each step saw, and operating the agent from those records.
Notes
Checkpoints, memory, and the code node.
Focused notes on the pieces the host keeps for you.
Note
Why replay needs the checkpoint
A step can only be replayed against the payload it originally received. That payload exists only if the host executed the run.
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Memory is not a side quest
The graph asks for memory. The host keeps it. Future executions can read what earlier ones learned.
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Sandbox the code node
A code node is expected. It still has to run somewhere that cannot take the host down.
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