J

Jev MCP

Fast, sub-cent typed judgments for agents via MCP

Fast, cheap, typed judgments from TypeSafe's Jev model, as MCP tools.Each judgment comes back typed: probabilities, and for most tools a confidence score, in roughly 150 to 500 ms, for a fraction of a cent. The cheap mechanical checks agents otherwise skip, because a frontier model is too slow to run on every page, claim, or candidate list.

jkudish/jev-mcp · v0.14.1 · source 86eae78 · Development & Workflow

jkudishOwner verifiedcaution
InstallSource
65Follow0

Trust Score

65

Security

64

Surfaces

2

Live launch

Fast, sub-cent typed judgments for agents via MCP

Launched
Sep 24, 2026
Pricing
free
Availability
available

What is Jev MCP?

Jev MCP is a published development & workflow plugin for AI coding agents in the codex ecosystem, developed by jkudish and distributed through the HOL AI plugin registry. Fast, sub-cent typed judgments for agents, such as verifying claims against evidence, screening content for prompt injection before it enters context, and ranking candidates by meaning, each with probabilities and confidence in milliseconds

Canonical slug
jkudish/jev-mcp
Version
v0.14.1 · source 86eae78 · updated Oct 7, 2026

Trust & Reputation

HOL Trust Score
65

Factor Analysis

Per-metric points (0–100 each) combined via a weighted average into the overall score.

Installability
64pts
Maintenance
100pts
MCP Posture
100pts
Plugin Security
64pts
Provenance
70pts
Publisher Quality
75pts

Registry Snapshot

Publisher verification
No
Marketplace source
Unknown
Scanner
Broker fallback
Safety label
caution
Digest verified
Yes
2 bundled skills — copy or download SKILL.mdOpen skills

Trust & reputation

Trust & Reputation

HOL Trust Score
65

Factor Analysis

Per-metric points (0–100 each) combined via a weighted average into the overall score.

Installability
64pts
Maintenance
100pts
MCP Posture
100pts
Plugin Security
64pts
Provenance
70pts
Publisher Quality
75pts

Provenance

Plugin root
.
Source repo
https://github.com/jkudish/jev-mcp
Source commit
86eae7861c60…
Publisher verified
No
Owner verified
@jkudish

Continuous scanner CI not detected

This plugin remains listed. Its overall trust score is reduced by 10% because security checks are not maintained in the source repository's CI.

Optional: maintain the scanner in the source repository's CI to receive the full trust score. Listing does not require that change.

Verified badge not detected

Add the HOL verified badge to the repository README to score +2% trust. Plugin owners can open that pull request from Guard Plugins.

Security Posture

caution
Safety label
64
Security score
0
High findings
Provider
registry-broker-fallback
Grade
D · caution
Version
Unknown
cisco-skill-scanner: unknown

Findings

mediumpublishabilitypublishability.link.missing.websiteURL

websiteURL should be present for marketplace readiness.

mediumpublishabilitypublishability.link.missing.privacyPolicyURL

privacyPolicyURL should be present for marketplace readiness.

mediumpublishabilitypublishability.link.missing.termsOfServiceURL

termsOfServiceURL should be present for marketplace readiness.

infoskill-securityskill-scan.unavailable

Cisco skill scanner timed out after 60000 ms

infoskill-securityskill-scan.unavailable

Cisco skill scanner timed out after 60000 ms

Jev MCP — Frequently asked questions

What is Jev MCP?
Jev MCP is an AI plugin in the HOL registry. Fast, cheap, typed judgments from TypeSafe's Jev model, as MCP tools.Each judgment comes back typed: probabilities, and for most tools a confidence score, in roughly 150 to 500 ms, for a fraction of a cent. The cheap mechanical checks agents otherwise skip, because a…
How do I install Jev MCP?
Install Jev MCP in your harness: Source — https://github.com/jkudish/jev-mcp/releases; Any agent — npx skills add jkudish/jev-mcp. Full step-by-step guidance is on the HOL plugin page.
How do I install Jev MCP in Source?
To install Jev MCP in Source, start with https://github.com/jkudish/jev-mcp/releases. The complete step-by-step install guide for Source is on the HOL plugin page.
Is Jev MCP free?
Jev MCP is listed as free on HOL.
Who publishes Jev MCP?
Jev MCP is published by jkudish and listed on HOL.
Is Jev MCP available now?
Jev MCP is currently available according to its latest public launch.

Install Guidance

Install in Source

Install from a native release archive or the assessed source revision.

Install guide
  1. 1

    Download the release archive

    Use a published GitHub release archive. The catalog version is the package version at the assessed commit.

    shell
  2. 2

    Follow the publisher install guide

    https://github.com/jkudish/jev-mcp/blob/86eae7861c60ea99a1b2eab2881db0fb1164fcc0/docs/INSTALL.md

Jev MCP
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Fast, cheap, typed judgments from TypeSafe's Jev model, as MCP tools.

Jev MCP

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Plugin Manifest

{
  "name": "jev-mcp",
  "version": "0.14.1",
  "description": "Fast, sub-cent typed judgments for agents, such as verifying claims against evidence, screening content for prompt injection before it enters context, and ranking candidates by meaning, each with probabilities and confidence in milliseconds",
  "repository": "https://github.com/jkudish/jev-mcp",
  "homepage": "https://github.com/jkudish/jev-mcp",
  "interface": {
    "displayName": "Jev MCP",
    "developerName": "jkudish",
    "category": "Development & Workflow"
  },
  "skills": "./",
  "holManifestOrigin": "synthesized",
  "registryIndexVersion": 5
}

Skills

2 SKILL.md files ship with this plugin. Preview, copy, or download each one, then install them with the Skills CLI.

Share
skills-cli

  • releasing

    .agents/skills/releasing/SKILL.md

    >

    Raw SKILL.md

    SKILL.md content is not in this snapshot. Open the raw file to copy it from the source repository.

  • jev

    skills/jev/SKILL.md

    Conventions for the Jev judgment tools. Use when screening fetched or pasted content, verifying claims against evidence, ranking or classifying items by meaning, comparing passages, extracting fields, auditing extracted values, reviewing a patch, gating completion, or judging how likely a proposition is — and when choosing between Jev and rg, curl, or plain reading.

    Raw SKILL.md

    SKILL.md content is not in this snapshot. Open the raw file to copy it from the source repository.

File Inventory

.agents/skills/releasing/SKILL.md

skill

2,798 bytes

926547484d69dc13…

.codex-plugin/plugin.json

plugin-manifest

565 bytes

fbf76793cff9cc4e…

package-lock.json

file

21,596 bytes

70514ac1bf8ba3a2…

package.json

file

1,708 bytes

3923da0d266c353d…

README.md

file

58,584 bytes

c59e3d968d39b26d…

README.md

file

58,584 bytes

c59e3d968d39b26d…

SECURITY.md

file

903 bytes

4dbc67f237ba0580…

skills/jev/reference/tools.md

skill

12,645 bytes

ca85854a139c8cc6…

skills/jev/SKILL.md

skill

7,873 bytes

b23f1627e33b5f82…

tsconfig.json

file

374 bytes

5ad73c5f22bf8dfd…

History, reviews, and alternatives

Latest launch

User reviews

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The first substantive review can be added on this page.

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Milestones and alternatives

Makers can publish releases and security milestones after claiming the plugin.