Failure is information
Tool failures, missing files, bad assumptions, and contradictory evidence are not interruptions to the plan. They are observations that may require a new plan.
A replanning agent records what failed, why it failed, whether it is retryable, and what alternative path is available.
Retry is not a personality trait
Retry transient failures with backoff. Do not retry deterministic failures without changing something. If a schema validation fails, fix the payload before trying again.
Repeated blind retries are how agents become expensive clocks. Tick, bill, tick, bill. Very elegant.