Skip to content
JevDirectory.orgTraffic count unavailable. View site traffic

Jev glossary

EcosystemAllow by default

Fail open

When Jev is down or slow, the gate allows the action, including rules that would otherwise block it.
All 177 terms
Category
Ecosystem
Also known as
Allow by default
Reading time
1 min
Related terms
4
Directory entries
3
Docs
Not listed
Added
2026-09-28

Definition

Gatekeeper's hooks fail fully open. If Jev is unreachable or slow, nothing is denied, forbid rules included, because a hook that throws would break the coding session. A fresh install starts in shadow mode, which logs the verdict and changes nothing.

Fail open is the right default only when a wrong allow is cheaper than a stuck tool. jev-guard uses the opposite default on withdrawals. Pick the one that matches the cost of the action, and log the fail-open rate so a dead client does not look like a quiet gate.

Tagssafetyrouting

Related terms

Definitions that connect to this one.

Fail closedWhen the model errors, times out, or lacks evidence, the system escalates or blocks instead of allowing the action.EcosystemConfidence-gated routingUse the answer to decide what to do and confidence to decide whether to act, with per-action thresholds set by the cost of being wrong.PatternsHuman reviewThe explicit path for uncertain or high-stakes cases: route to a person instead of acting on a low-confidence answer.PatternsCoding agentThe fastest-growing corner of the Jev ecosystem: MCP servers, tool-call gates, context pruners, and skill rankers.Ecosystem

From the Jev directory

Directory entries that go deeper on this term.

Gatekeeper
21GitHub stars
Claude Code hooks that narrow a roster in YAML, ask Jev which handler owns a prompt, and log the band before anything is blocked.
Jev Agents & MCP#community#python#coding-agent
CommunityAgriciDaniel/gatekeeperPython
JEV core
1GitHub stars
A standard-library-only judgement primitive and harness for Jev: ask N items × K typed questions in bounded, fail-open requests, and consume answers through a closed boundary in code that refuses anything outside the set you enumerate.
Jev Tools & CLIs#community#catalog-import#logicrw
Communitylitshing/jevcorePython
ask-jev
2GitHub stars
Zero-dependency Python CLI that routes small semantic judgments to Jev for agents and CLI pipelines: choose (Choice), check (Noul), score (ordered ratings), batch (1-32 questions in one request) and purify (verbatim passage extraction). GPL-3.0 licensed.
Jev Tools & CLIs#community#cli#decision-routing
Communitylogicrw/ask-jevPython

From the Jev AI model community

Posts from builders shipping with Jev right now.

Follow @typesafeai