# Runbook: model storage low

## Trigger

`STORAGE_LOW` fires because usable free bytes after absolute/percentage reserve are below policy or
unknown.

## Diagnose

Confirm the registered root, observed time, writable status, total/free bytes and reserve. Inspect
active artifact locations, acquisition quarantine, rollback retention and migration dependencies.
Never treat an unavailable capacity reading as healthy.

## Act and recover

Use dependency-aware M12 cleanup planning and explicit confirmation. Never issue ad-hoc recursive
deletion or remove retained rollback artifacts. Reclaim only reviewed candidates, then collect a
fresh storage snapshot and confirm the alert resolves. Escalate filesystem errors, divergent agent
paths or repeated unexplained growth.