Jev Confidence Gates Before the Tool Runs
Set a Jev confidence threshold per tool class from 200 of your own labeled calls. Jev may deny or ask, never approve; destructive calls never run on its word.
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Playbooks
Use Jev to Route Cheap Models Without Guessing
Jev model routing as code: tiers with written criteria, an unclear exit, a floor that keeps unsure work on frontier, and cost per merged PR as the test.
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Claude Code + Jev: Put the Gate in a Hook, Not an MCP Tool the Agent Can Skip
Claude Code Jev integrations shipped as a plugin and MCP tools the agent can skip. Put the gate in a PreToolUse hook that fails closed, with deny rules behind.
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Log Every Jev Decision — and Pin the Version the Record Carries
A Jev decision log needs one record per call: state reference, versioned questions, answers, reported model and policy. Pin jev-1.13.0, never jev-latest.
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When Jev Returns 429: Decide Fail-Open or Fail-Closed First
A Jev rate limit will stall your gates. Write each gate's fail mode first, budget both TypeSafe limits fleet-wide, and cap SDK retries inside the deadline.
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Jev Can Be Prompt-Injected Too: Read the Jaggedness Page Before It Guards a Tool
Jev prompt injection is in TypeSafe's own docs. Put an allowlist first, send only needed fields, and pin injected fixtures so a flipped verdict blocks upgrades.
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Fan Out Jev Judgments, Compose Policy in Code
Jev API questions belong in one call: keyed Nouls, Choices and Scores return a decision vector. Compose policy in code, validate IDs, retire yes/no subagents.
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Shadow-Mode Jev Before It Skips Your CI Tests
AI CI test selection with Jev starts in shadow: count false skips against real failures, canary on a slice, and pin the action by SHA before you enforce.
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Jev Soft-Ranks Skills — Agents Still Decide
Jev skill selection without hiding skills: gate on need, shortlist three, inject one suggestion line, let the agent decide, and log every override it makes.
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