Incident response policy checks with Jev
Prometheus rules and PagerDuty already page on numeric thresholds. Jev is optional on messy customer-reported incidents or multi-alert narratives: which SEV band, which runbook class? It does not roll back deploys or page people.
This unofficial page is the policy checks slice of the incident response classification pack. Intent: apply the Jev (TypeSafe System One) decision model to incident response classification policy checks. Primary search language: Incident response Jev policy checks. 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): Runbooks and pagers stay; Jev classifies messy alert/customer text into SEV / runbook class, then code pages. Not a runbook-clone or status-page IA photocopy.
Incident response use-case context
A policy check is a typed question whose instructions + criteria are your rules about the alert/customer incident narrative. Jev scores compliance; the incident classifier enforces. This is not a certification, and it is not a photocopy of a rival “policy engine” page — we keep rules atomic and ANDed in code.
Hub: Use cases. Compare, when the other tool is the real job: incident runbooks.
Policy Checks inputs
Put policy text and the artifact in structured state (never hope the model memorized last quarter’s PDF):
{
"report": { "id": "INC-44", "text": "Checkout 500s since 14:02 UTC after the payments deploy. Status page still green." },
"signals": { "error_rate_bucket": "high", "payments_deploy_recent": true },
"policy": { "sev1": "SEV1 = complete checkout loss or safety." }
}Name report.text, policy.sev1, signals.error_rate_bucket.
Decision signals and actions
| Id | Rule | Enforce |
|---|---|---|
metrics_win |
Numeric SLO breaches page without Jev | code / Prometheus |
sev_def |
Language vs written SEV1 definition | Jev Choice + Noul |
mitigation |
Rollback steps live in the runbook | runbook |
Typical primitives on the same request:
| Id | Type | Job |
|---|---|---|
sev |
Choice | sev1 / sev2 / sev3 / other |
runbook |
Choice | payments_deploy / dependency / capacity / unknown / other |
customer_impact |
Noul | Does the narrative describe user-visible loss vs policy.sev1? |
violations = [name for name, ans in policy_nouls.items() if ans.noul >= T_VIOLATION]
if violations:
return review(violations)Do not treat a Noul of 0.5 as a “medium” incident response classification score — it means yes and no are equally likely. Conjunctions stay in your code.
Guardrails and escalation
Policy-in-state can be attacked (“ignore the policy”). High-risk paging SEV1 / rolling back via automation still needs deterministic checks. TypeSafe’s confidence-gated examples use a lower bar for recoverable reads than for irreversible actions. Those numbers are illustrations. For incident response classification, treat page_sev1 as the high bar (paging SEV1 / rolling back via automation). Tune on labels — see offline evaluation.
Evaluation and rollout notes
Gold labels are policy-versioned. A criteria edit without replay is how silent false-allows ship. 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 | you are here |
| Act / review / abstain | confidence thresholds |
| Reviewer payload | human handoff |
| What to persist | audit trail |
| How it breaks | failure modes |
| Labeled replay | evaluation |
| Shadow → canary | production rollout |
FAQ
One Score for “compliant”? No. Atomic Nouls per rule, AND/OR in code. Money and dates: extract in code first (jaggedness).
If a regex can enforce it, should I still call Jev? Skip Jev. Official “how to build” guidance: keep deterministic rules in code when you can.
Where is the rest of the Incident response pack? Start with Incident response decision workflow and Incident response human handoff. Cluster hub: Use cases.
If metrics already say critical, should we wait for Jev? No. Metrics page now. Jev is for leftover messy text. See safe defaults.
Can Jev write the status-page update? Not in this workflow. Classification only. Generation is a different job.
What this page does not claim
- Not a pager, status page, or IR retainer.
- No MTTR or uptime claims.
- Not official TypeSafe.
- Official TypeSafe status, or that jev.pro issues API keys.
- That a schema-constrained answer is automatically factually correct.
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.