Build an Adversarial Review Workflow With Opus 4.8

On May 28, 2026 Anthropic released Claude Opus 4.8 alongside dynamic workflows in Claude Code. A dynamic workflow is a JavaScript script Claude writes for you that orchestrates many subagents in the background while your session stays free. The headline demo is the bundled /deep-research command, but the real power shows up when you codify a quality pattern that a single conversation cannot run reliably: independent agents that review each other's work before anything is reported back to you.

This guide walks through that pattern end to end. You will build an adversarial review workflow that audits every API route under a folder for missing authentication checks, uses Opus 4.8 as the auditor, has a second batch of agents critique those findings, and only surfaces issues that survive cross-checking. Then you will save the run as a reusable /audit-auth command. The exact same pattern transfers to migration sweeps, security reviews, doc audits, and research questions.