Run a bounded implement-attack-repair loop for a user-specified task. Use when work needs repeated independent criticism: perform the task, dispatch a fresh attacker, verify significant findings, repair them, and stop on a clean attack or the user's round limit.

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Explain a file, error, design, diff, or concept like a helpful engineering colleague: grounded in evidence, concise, and with useful follow-up threads. Use when the user asks for a clear explanation of the current work or codebase.

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Turn one user criticism into a principle-level fix: find the violated principle, every similar occurrence, and fix the shared cause. Use only when the user explicitly invokes expand, $expand, /up:expand, or /skill:expand.

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Use when a task needs an isolated checkout. Verify the worktree location, keep mutable environments and build outputs local, and run only authorized setup and checks.

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Contract for hands-off mode — the ultrapack workflow variant that minimizes user prompts after Design, takes the safest reversible path, and logs every auto-choice for one end-of-task review. Referenced by the workflow entry point and child skills (udesign, uplan, uexecute, uverify, ureview). Read when the task file's **Mode:** header is `hands-off`.

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Use when the user explicitly asks to launch and supervise a job. Require an authorized launch, monitoring, recovery, and teardown contract. Detect failures without inventing permission to restart or spend money.

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