ub-mode

Skill

Uncle Bob's single-file skill: make it work, make it right, follow practice, on every change your agent makes.

by unclebob Listed Oct 25, 2026

Clone or download it from github.com, then drop the folder into ~/.claude/skills/ (Claude Code) or your agent's skills directory.

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About ub-mode

A one-file skill from Robert C. Martin that boils his coding principles down to a short ladder the agent follows on every edit: get it working with the smallest change, then clean it up, then follow team practice.

Includes a test-first loop, a "laziness protocol" (one decision in one place, smallest edit wins) and data-shape-first thinking. Invoke it with /ub-mode. MIT.

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