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Design a guardrail layer for a support agent using a decision model like Jev. What stays in code, and how do you prove it works?

Cheap typed judgments make it affordable to check every input, tool call and output. The design question is which checks are semantic, which are deterministic, and how you prove the layer catches what it claims to.

Updated Sep 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

Cheap typed judgments make it affordable to check every input, tool call and output. The design question is which checks are semantic, which are deterministic, and how you prove the layer catches what it claims to.

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Next in this trackA customer wants Jev to 'control' their support agent: pick the tool, decide when it is done, escalate when stuck. What do you build?PremiumNext in this trackThirty teams at a bank are building agents. Design the gateway every model call, MCP tool call and agent-to-agent request goes through.PremiumNext in this trackYour refund agent succeeds on 70% of test tasks. The customer asks if it is reliable enough to ship. How do you answer?Premium
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