Challenge a plan

Share the proposal, constraints and relevant code with a reviewer from another vendor:

Ask Claude to challenge this plan before we implement it. What assumptions could fail, what evidence is missing, and what simpler alternative would fit our constraints?

Use Claude from a host other than Claude Code; ask Codex or another authenticated provider when working in Claude Code. Name the constraints that would make a recommendation unusable: migration compatibility, latency, budget, data boundaries or team size.

Ask the reviewer to distinguish observed facts from assumptions. Your assistant should validate claims against source or primary documentation before changing the plan. The number of models agreeing does not establish correctness.

For several independent answers without synthesis, compare answers. For research followed by an attributed synthesis, brainstorm.