Some tasks must not be delegated to Cowork regardless of how the brief is written or how capable the tool appears. The categories: regulated data, sensitive personal records, personnel and legal judgment, irreversible actions, external commitments, and ambiguous or untrusted source material. The default posture when uncertain: refuse or redesign before starting, not after the output arrives. The decision rule: if the task involves sensitive data, regulated information, someone else's personal records, an irreversible action, or a judgment about a person , stop and redesign.