jeff: A self-hosted drop-in replacement for TypeSafe's jev, powered by GliFormer

by logan-markewich · AI Tool · ★ 313

Last updated: · Indexed by AgentSkillsHub · Auto-synced every 8h

Security audit verdict: SAFE · quality 72/100

None of the 42 rules matched — no credential harvesting, no data exfiltration, no curl-pipe-shell installer. Scanned against 42 published rules built on the SlowMist agent-security taxonomy, refreshed every 8 hours.

The quality score combines nine heuristic checks of the repo and its README: completeness, clarity, specificity, examples, structure, agent readiness, step-by-step content, instruction quality and security notes. It rates how well the project explains itself to an agent, not the code.

classificationencoderglinerjevtypesafe

Quick Facts

Stars313
Forks24
LanguagePython
CategoryAI Tool
LicenseMIT
Quality Score72/100
Open Issues4
Last Updated2026-09-20
Created2026-09-19
Platformspython
Est. Tokens~15k

About jeff

jeff A self-hosted implementation of TypeSafe's jev System One API, powered by GLiFormer (400M parameters). Use the official by pointing at jeff. Supports (pick an option), (rate on ordered levels), and (probability of yes). Cheaper to self-host, but less accurate than jev on reasoning-heavy tasks. See benchmarks.

Compatible Skills

These tools work well together with jeff for enhanced workflows:

  • open-alternative-jev — semantic(0.58)+complementary+shared_fw(huggingface)+rare_topics+same_lang+shared_platform (77%)
  • Verdict-open-jev — semantic(0.36)+complementary+shared_fw(huggingface)+same_lang+similar_pop+shared_platform (70%)
  • jev-codex-router — semantic(0.42)+complementary+rare_topics+same_lang+similar_pop+shared_platform (69%)

jeff alternative? Top 6 similar tools

Looking for a jeff alternative? If you're comparing jeff with other ai tool tools, these 6 projects are the closest alternatives on Agent Skills Hub — ranked by topic overlap, star count, and community traction.

  • awesome-jev-use-cases by walidboulanouar · ⭐ 480

    Awesome list of TypeSafe AI Jev use cases: 74 demos ranked by likes, 150+ GitHub repos, limits, cost and API e

  • awesome-jev by kraayenjon · ⭐ 204

    A curated list of Jev use cases, projects, SDKs, and resources. Jev is TypeSafe AI's System One model for fast

  • open-alternative-jev by ikermoel · ⭐ 76

    Open-source alternative to TypeSafe's Jev: a System One style model layer that gives typed, calibrated decisio

  • awesome-typesafe by AbdelStark · ⭐ 400

    A curated list of official resources and community projects for TypeSafe, System One models, and Jev.

  • tinystruct by tinystruct · ⭐ 363

    A lightweight, modular Java application framework for web and CLI development, designed for AI integra

  • jev-align by sutro-sh · ⭐ 315

    Build calibrated AI Functions from human feedback using Jev and GEPA.

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How this security grade is produced

Grades come from a rule-based scan built on the SlowMist agent-security taxonomy: 42 published rules, covering credential harvesting, data exfiltration, curl | sh installers and more. It is a first-layer scan, not a manual audit — we say so rather than overstate it.

The scale of the problem is documented independently: Liu et al. (2026), in a study of 31,132 agent skills, report that 26.1% contain security vulnerabilities. Our own full-catalog census is published as a citable open dataset.

Sources & who's responsible:

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