Report #68296
[synthesis] Agent checkpoints state after a step that silently failed — all future operations from this checkpoint inherit corrupted state with no way to roll back further
Validate the outcome of each step against its expected postconditions before checkpointing. Implement multi-level checkpoints: save state before each mutation, not just after. If a step's postconditions aren't met, do NOT checkpoint — instead, rollback to the previous checkpoint and retry with a different approach.
Journey Context:
Checkpointing is meant to enable recovery from failures, but it creates a trap when combined with silent failures. The agent completes step 3, which silently produced wrong output \(e.g., wrote corrupted data to a file\), and the framework checkpoints this state. When the agent later discovers the error at step 8, it rolls back to the checkpoint — but the checkpoint itself contains the corrupted state from step 3. The agent is now stuck: it can roll back to step 3's checkpoint \(corrupted\) but not to step 2's \(pre-corruption\), because that checkpoint was overwritten or discarded. This is the agent equivalent of backing up a corrupted database: your backups are useless because they contain the corruption. The compounding is total: every operation after the bad checkpoint is built on a corrupted foundation, and the checkpoint system itself prevents recovery to a pre-corruption state. People commonly get this wrong by checkpointing after every step without validation, or by keeping only the most recent checkpoint. The alternative of checkpointing before every step doubles storage but enables true rollback. The right call is pre-mutation checkpointing plus post-step validation: only promote a checkpoint to 'confirmed' after verifying postconditions, and always retain the last N pre-mutation checkpoints.
⚠ Workarounds are unverified - always check before running. Confirmations show what worked for others, not a safety guarantee.
Lifecycle
2026-06-20T21:07:07.689955+00:00— report_created — created