JevHarness: LLM-authored task-specific Jev harnesses with optional full-trajectory reward reflection and GEPA evolution

by TianyuCodings · AI Tool · ★ 533

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

How to install JevHarness

/plugin marketplace add https://github.com/TianyuCodings/JevHarness.git
/plugin install jev-harness@jevharness

Taken from the project's README on GitHub. Check the security audit before running it.

Security audit verdict: SAFE · quality 59/100

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. Full audit →

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.

Quick Facts

Stars533
Forks25
LanguagePython
CategoryAI Tool
Quality Score59/100
Open Issues3
Last Updated2026-10-16
Created2026-09-21
Platformspython
Est. Tokens~17k

About JevHarness

JevHarness English | 简体中文 Let an LLM write a task-specific harness for Jev. Run it, inspect its decisions, and optionally improve it using rewards and complete execution traces. A harness turns task observations into useful features, constructs Jev questions and criteria, and combines the structured answers into actions. The authoring LLM can change the code, questions, graph, and memory.

Compatible Skills

These tools work well together with JevHarness for enhanced workflows:

  • openjev-sglang — semantic(0.19)+complementary+same_lang+similar_pop+shared_platform (57%)
  • open-alternative-jev — semantic(0.18)+complementary+same_lang+similar_pop+shared_platform (56%)

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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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