Adversarial TanStack Gate

A merge gate for TanStack Start + TypeScript web-app changes — 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 @tanstack/react-start 1.168+ (v1 RC, July 2026) and TypeScript 5.8–6.x semantics.

When to Apply

• A TanStack Start feature, route, or server function is about to merge and needs an objective PASS/FAIL, not advisory feedback.
• An agent (Claude, Codex) authored Start app code and you want an independent check its author bias cannot rubber-stamp.
• A diff touches the client/server boundary — env vars, loaders, server functions, auth — where a wrong PASS ships secrets or unauthorized data access.
• Auditing an existing Start codebase file set against the current v1 RC API surface (stale .inputValidator(), removed createServerFileRoute).

Do not apply to non-Start React apps (most serverfn/boundary/ssr rules will return N/A and the gate degenerates to a TypeScript check) or when the user wants explanations and refactors rather than a verdict.

Review Protocol

Follow these steps exactly — the gate's value is that every review runs the same way.