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Use cases· Last updated

Email production rollout with Jev

A draft exists (human or LLM). Jev judges policy, tone, and whether a promise is unsupported. Code sends, holds, or requests a rewrite. Jev does not deliver mail.

This unofficial page is the production rollout slice of the outbound email decisions pack. Intent: apply the Jev (TypeSafe System One) decision model to outbound email decisions production rollout. Primary search language: Email Jev production rollout. Confirm patterns on docs.typesafe.ai. This site does not sell, issue, or proxy TypeSafe keys. Use a credential you already have from the console or a documented gateway.

Independent angle (cover ≠ clone): Send/hold/rewrite as typed decisions + policy excerpts — not a clone of email-automation IA or a drip-builder page.

Email use-case context

Production rollout for outbound email decisions is Operate-pillar work: pin, shadow, canary, abort. It is not a launch-checklist clone of a rival “build with System One” guide — we only talk about this pack’s blast radius (sending to a real recipient).

Hub: Use cases. Compare, when the other tool is the real job: email automation.

Production Rollout inputs

Ship the contracted payload, the pinned id, and a documented safe default when the API is unavailable:

{
  "draft": { "subject": "Your Q4 discount", "body": "Locked 40% off if you reply today." },
  "recipient": { "segment": "trial", "consent_email": true },
  "policy": { "promises": "Do not invent discounts not in offer_table.", "tone": "No urgency dark patterns." },
  "offer_table": { "trial_discount_pct": 20 }
}

Decision signals and actions

Stage What changes Email rule
Shadow Nothing customer-visible ESP sends as today; log Jev disposition.
Canary One low-blast slice auto-acts Enforce holds on policy_ok only for one template.
Abort Auto-act off New offer table → freeze auto-send.

Keep the workflow code you already designed:

def email_gate(ans, consent):
    if not consent:
        return "hold_consent"  # code, not Jev
    if ans["policy_ok"].noul >= T_VIOL:
        return "hold"
    if ans["disposition"].confidence < FLOOR or ans["disposition"].choice == "other":
        return "review"
    if ans["tone"].score >= 2:
        return "rewrite"
    return ans["disposition"].choice

Do not treat a Noul of 0.5 as a “medium” outbound email decisions score — it means yes and no are equally likely. Conjunctions stay in your code.

Guardrails and escalation

Safe default if System One errors or confidence is low: do not send to a real recipient. TypeSafe’s confidence-gated examples use a lower bar for recoverable reads than for irreversible actions. Those numbers are illustrations. For outbound email decisions, treat send as the high bar (sending to a real recipient). Tune on labels — see offline evaluation.

Evaluation and rollout notes

Promotion gate = evaluation green on the pinned id + audit traces for the canary. Pin jev-1.13.0 (the versioned id) after you fit thresholds. jev-latest and the marketing line jev-1.13 can move. Log the response model. TypeSafe’s published list price for jev-1.13 is $0.042 per million input tokens (vendor claim — confirm on the models page); output tokens are free on that same page. Unused distractors still bill as input.

Official Python and JavaScript SDKs read TYPESAFE_API_KEY and retry documented 429/529. This site does not sell, issue, or proxy TypeSafe keys. Use a credential you already have from the console or a documented gateway.

Pack map

Slice Page
Graph and primitives decision workflow
What may enter state input contracts
What to gather first evidence collection
Atomic rules policy checks
Act / review / abstain confidence thresholds
Reviewer payload human handoff
What to persist audit trail
How it breaks failure modes
Labeled replay evaluation
Shadow → canary you are here

FAQ

Can I ship on jev-latest? Pin jev-1.13.0 (the versioned id) after you fit thresholds. jev-latest and the marketing line jev-1.13 can move. Log the response model. Shadow first.

What is the safe default if System One is down? Fail closed on sending to a real recipient. Do not guess.

Where is the rest of the Email pack? Start with Email evaluation and Email confidence thresholds. Cluster hub: Use cases.

Does this page sell email infrastructure? No. It is an unofficial decision-layer pattern. We do not sell keys or ESP access.

Can Jev write the email? Not in this workflow. Generate elsewhere; Jev gates. That keeps cite/send decisions inspectable.

What this page does not claim

Disclaimer

This is an independent unofficial site and is not affiliated with TypeSafe AI; official documentation is available at https://docs.typesafe.ai.

Primary documentation: https://docs.typesafe.ai. Hub: Use cases.

Sources

Public TypeSafe or adjacent documentation only. No private claims.