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Pick your use case

Every example below is valid JSON. Schema validation passes. Your system accepts it. And the data is wrong.

Lead Scoring

tier: "hot", score: 25 — your sales team calls a cold lead as hot

Invoice Extraction

subtotal: 100, tax: 10, total: 105 — the math doesn’t add up

Agent Actions

action: "close_ticket", status: "needs_review" — the agent closes what’s still in review
Each guide shows the silent failure, how Boundary catches it, and the contract that prevents it.