Use when a diff or PR is too big to review by eye and the question is "what should I actually look at" — sorts each changed line into wire / CLI / API / logic / test / doc tiers, then opens a clickable local page with the real hunks. A reading order, never a verdict.
Use to implement a plan artifact from `/swarm-plan`, or a free-text implementation task with contract-first TDD + Review-Fix Loop. Tier (`low | auto | high | max`) scales builder model, loop rounds, review breadth, and Codex code-diff gate.
Use for branch, PR, or diff review before landing on main. Tier (`low | auto | high | max`) scales breadth from single reviewer to adversarial panel with architect + SOTA-gap + Codex cross-model gate. Triggers: "review", "/swarm-review", pre-merge checks.
Use when the user says "commit", "/commit", "save progress", or asks to land working changes on a feature or worktree branch. OCX working-phase posture — minimises commit count, can amend rolling Checkpoints, offers a one-time PR prompt. For pre-merge cleanup, use `/finalize`.
Use for feature planning, task decomposition, multi-perspective research, or ADR scaffolding. Tier (`low | auto | high | max`) scales research depth, architect model, and review breadth. Canonical research primitive for AI config / ADR work.
Use when the user says "codex review", "/codex-adversary", "adversarial review", "cross-model review", or asks for a different-model second opinion on a diff or plan artifact. Complements `/swarm-review` via Codex-CLI. Scopes: code-diff (default), plan-artifact (gate for `/swarm-plan`).
Use when auditing the freshness of `.claude/rules/subsystem-*.md` files against current codebase state, or when a subsystem has undergone significant change.
Use when task involve design spec, ADR, one-way-door decision, or evaluate trade-offs between architectural approaches. Invoke before implementation when requirements span subsystems or decision hard reverse. Trigger: /architect.