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adversarial-zod

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Use this skill to gate Zod 4 schema code in TypeScript and TanStack Start apps with a pass/fail adversarial review — a single blind reviewer subagent judges a diff or file set against 24 decidable rules covering silent Zod 3-to-4 semantic breaks (defaults, enum-keyed records, boolean coercion), removed APIs (including the z.interface hallucination), unified error customization, deprecated method forms, recursion and codec composition, adapter-free TanStack Start validators, and packaging. Trigger it before merging Zod schema work, when asked to gate, adversarially review, or pass/fail Zod usage, or as a currency check that agent-authored schemas use the latest Zod 4.x surface. It renders verdicts only and never fixes the work; for teaching-style Zod feedback use the curated zod skill instead.

skills/.experimental/adversarial-zod/SKILL.md

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# Adversarial Zod Gate

A currency and correctness gate for Zod schema code in TypeScript apps — a pass/fail gate: a single blind reviewer subagent judges the work against this gate's rules with an adversarial mandate, and the work passes only when every rule is PASS or N/A. This skill renders verdicts; it never fixes the work.

Rules are pinned to **zod 4.4.x** (package root since zod@4.0.0, July 2025) and, for the `start-` category, the **TanStack Start v1 RC** (`.validator()` current, `.inputValidator()` deprecated).

## When to Apply

- A diff or feature that defines or edits Zod schemas is about to merge and needs an objective PASS/FAIL on Zod 4 currency, not advisory feedback.
- An agent (Claude, Codex) authored schema code and you want an independent check that it is not reproducing Zod 3 training-data patterns — deprecated method forms, removed params, or the `z.interface()` hallucination.
- A Zod 3 → 4 migration claims completion and needs the silent semantic breaks audited (`.default()` short-circuiting, exhaustive enum-keyed records, `z.coerce.boolean()` on string flags).
- A TanStack Start app validates server-function input or search params with Zod and should be on the adapter-free Standard Schema patterns.

Do not apply to Zod 3 codebases (the reviewer prompt's precondition aborts with "GATE NOT APPLICABLE"), or when the user wants explanations and refactors rather than a verdict — that is the curated `zod` distillation skill's job. The two `start-` rules go N/A outside TanStack apps; the rest of the gate works in any TypeScript project using Zod 4.