base.checkpoint

Checkpoint

Checkpoint is the full checkpoint payload: identifiers + timestamp + state.

Use create_checkpoint(...) to create a new checkpoint instance.

CheckpointStore

CheckpointStore is a protocol describing the storage backend.

Implementations must support:

• save(checkpoint)
• load(checkpoint_id)
• list_by_run(run_id)
• get_latest(run_id)

MemoryCheckpointStore

MemoryCheckpointStore is the built-in development store. It is:

• Simple to use
• Process-local
• Not durable

Use it for tests and local experiments.

CheckpointPolicy

CheckpointPolicy controls when checkpoints are created:

• On step start
• On step end
• On error
• On interrupt

Serialization helpers

Use serialize_state(...) / deserialize_state(...) when you need a basic JSON serialization layer for checkpoint payloads.

Next steps

Checkpointing concept

When and how to persist state across long-running runs.

Agent loop

Where checkpointing hooks into iteration control.