Individual skill

proof-verify

Plan-based verification - freeze acceptance criteria before building, then verify after with an independent fresh-context agent (the builder must not verify their own work). For multi-stage work, seal accepted inputs with commit/tree, contract, input/output digests, and a fresh verdict so downstream stages do not reopen them. Use when - "verify against plan", "proof check", "independent review", "check the implementation", or confirming a feature built from a plan meets spec. Do NOT use for quick one-off checks with no plan, or for letting the builder self-verify.

skills/development/proof-verify/SKILL.md

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# Proof Verify

Plan-based verification: freeze acceptance criteria BEFORE building, verify AFTER with independent agents.

## When to Use

- After completing a feature/fix that was built from a plan
- When you need independent confirmation that work meets spec
- When the builder should NOT verify their own work
- Trigger phrases: "verify against plan", "check the implementation", "proof check", "independent review"

## The Pattern

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