Review Tools

Cross-review a document or written artifact for quality using two independent reviewer agents that check each other, then adjudicate any single-reviewer finding before adopting it. The two reviewers are codex (via the codex CLI) and fable (via the Agent tool); findings only one of them raises are cross-verified — fable-only by codex, codex-only by a stronger third model (opus) rather than by fable. Use this whenever the user asks to review, cross-review, or get a second / independent opinion on a doc, spec, ADR, PDD, PRD, RFC, README, runbook, or any prose artifact for readability, structure, terminology, or duplication — especially when they mention "two agents", "cross review", codex, fable, or want single-reviewer findings verified before they are accepted. Prefer this over a single-agent review whenever review quality or reducing one reviewer's bias matters.

Cross-review a code change with two independent, strong reviewer agents that check each other, and adversarially verify any single-reviewer finding before adopting it. The two reviewers are codex (via the codex CLI) and opus (via the Agent tool); a finding only one of them raises is sent to the other reviewer, which tries to refute it before it counts. Use this whenever the user asks to review, cross-review, or get a second / independent opinion on a diff, pull request, branch, commit, or set of changed files — for correctness, edge cases, security, error handling, tests, or conventions — especially when they mention "two agents", "cross review", codex, or want findings verified or refuted before they are accepted. Prefer this over a single-agent code review whenever review quality matters or a lone reviewer's false positive / false negative would be costly.