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Verdict: Useful + over-broad. ~130 lines. Source cluster: research/cluster_9_computer_use.md. Strongest claim: data-oriented error handling applied to the file-write boundary — Fable's prompt-level discipline + Manual Slop's tool-level discipline + nagent's data-level discipline (SHA-256 hash validation) form a progression. Useful: file-presence check, read-in-full, format-check, no-boilerplate. Over-broad: chat-UX framing.