Skill: Rubber Duck

Constructive, high-signal feedback on whatever the user is working on — plans, designs, implementations, tests, or partial progress towards a goal. Acts as a devil's advocate: "why might this not work?" and "what could be improved?"

Use this skill early and often. Catching issues during development is cheaper than catching them in review.

How to run

1. Pick the subagent model from the table below.
2. Launch a general-purpose subagent with the critic prompt at the end of this file.
3. Fill in the <placeholders> with a summary of what to review and how to inspect it. Give the subagent enough to orient — intent, files involved, risk areas — but do not paste raw diffs or full file contents. The subagent reads files itself.

Model selection

Choose a complementary, higher-order model so the critique comes from a different perspective: