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Use Cases / image-presence-gate

Jev Image Presence Gate (beta)

Image inputs and Box questions are beta and dreamer-ready, not recommended for production. Sometimes you only need a yes/no: is a badge, logo, or warning visible — not a full bounding box.

Try a related template free on this host — 5 anonymous real-API runs with no signup — then ship the same schema with a prepaid jv_live_ key. See is Jev free? and playground.

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Why Jev

Attach image assets and ask a noul (or choice) over the image. You get a calibrated probability your code can threshold — still experimental multimodality, not a replacement for trained classifiers.

How to define the decision

assets.frame = { type: "image", format: "png", data_base64: "…" }. questions.visible = { type: "noul", instructions: "Is a warning badge visible in frame?" }. Optionally add a box question for the same asset.

When to use Jev

  • Prototype “is X visible?” gates
  • Pairing a presence Noul with a follow-up box question
  • Eval harnesses comparing text-only vs image-augmented asks

When not to use Jev

  • Safety-critical allow/block in production
  • Fine-grained multi-label taxonomy at scale
  • Video streams

Failure modes and human fallback

  • Upstream or network errors: retry with backoff; do not invent a decision.
  • Low confidence: route to a human queue or safer default — never auto-act on money/destructive tools.
  • Schema drift: keep a golden fixture set in CI so label changes fail the build before production.
  • Official: Image inputs and Box questions are beta and dreamer-ready, not recommended for production.
  • Image tokens still meter as input when you call the live API.
  • Prefer dedicated vision classifiers for production presence detection.

API example

Same prepaid jv_live_ balance as tools. Output tokens are free on this host's metering model.

curl
curl https://jevtypesafe.org/api/v1/decide \
  -H "Authorization: Bearer jv_live_YOUR_KEY_HERE" \
  -H "Content-Type: application/json" \
  -d '{"state":"Customer: I've been waiting five days for my refund.","questions":{"action":{"type":"choice","instructions":"Decide the next step","criteria":{"allow":"safe","review":"unsure","block":"unsafe"}}}}'

FAQ

Is this safer than box for production?
No. Image inputs (and Box) remain beta and dreamer-ready — not recommended for production either way.
Can I combine noul and box?
Yes — same decide call can include both question types over shared assets. Still experimental.

Related use cases

Ready to build?

Free anonymous tool runs, then prepaid packs and a jv_live_ key — independent host, not affiliated with TypeSafe AI.

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