JevHarness plugin for Grok Build
LLM-authored task-specific Jev harnesses with optional full-trajectory reward reflection and GEPA evolution.
How to install JevHarness in Grok Build
grok plugin install TianyuCodings/JevHarness --trustReview before you trust it. --trust lets this plugin's hooks, MCP servers and scripts run code on your computer. It's a community repo that neither xAI nor GrokStacks has reviewed, so read its code first.
We install this repo directly: Grok Build 1.0.62 can't install it through its own marketplace file. Then start a new Grok session, or press r in /plugins, to load it.
Command format: Grok Build's plugin guide
What we checked: on Oct 18, 2026 it installed with grok 1.0.62 and Grok found 1 skill. That's an install check only: we haven't run it in a live Grok session.
What it contains
Skills (1)
jev-harness— Build, evaluate, and optionally evolve task-specific code and Jev decision pipelines with JevHarness. Use when a user wants a reusable Jev agent, a new task adapter, or trajectory-and-reward optimization; begin by clarifying the task and ev
About this listing
JevHarness is a community plugin on GitHub by TianyuCodings, written as a Claude Code plugin that Grok Build installs. We install-checked it in Grok; we haven't run it in a live session or reviewed its code. When we installed it, Grok found 1 skill. No license stated in the repo, so check with the author before reusing its code. We checked commit d7676033c34c. It's one of 162 listings in the Productivity category on GrokStacks.
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JevHarness FAQ
How do I install JevHarness in Grok Build?
Run grok plugin install TianyuCodings/JevHarness --trust. We install-checked this command in Grok Build. We install this repo directly: Grok Build 1.0.62 can't install it through its own marketplace file. Then start a new Grok session, or press r in /plugins, to load it.
Is JevHarness an official Grok Build plugin?
No. JevHarness is a community plugin on GitHub by TianyuCodings, not in xAI's official Grok Build marketplace. We checked that it installs and what Grok loads from it, but haven't run it in a live Grok session or reviewed its code.
What does JevHarness include?
According to what Grok loaded in our install check, JevHarness includes 1 skill: jev-harness.
Details
- Type
- Plugin
- Category
- Productivity
- Source
- Community Claude Code plugin, installs in Grok
- License
- No license stated
- Author
- TianyuCodings
- Version
- 0.1.0
- Source repo
- https://github.com/TianyuCodings/JevHarness
- Checked commit
d7676033c34c- Homepage
- https://jev-harness.tianyuchen99.chatgpt.site
- Checked by GrokStacks
- Install-checked in Grok Build on Oct 18, 2026; not run in a live session
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For maintainers: badge and embeds
Maintain JevHarness? Add the badge; it links to this page.
Markdown
[](https://grokstacks.com/p/jevharness/)HTML
<a href="https://grokstacks.com/p/jevharness/"><img src="https://grokstacks.com/badge.svg" alt="Listed on GrokStacks" width="164" height="28"></a>Embed card (static HTML and inline CSS, no JavaScript). Preview:
<a href="https://grokstacks.com/p/jevharness/" style="display:block;max-width:380px;box-sizing:border-box;padding:14px 16px;border:1px solid #2a2e3c;border-radius:12px;background:#0a0b0f;color:#e8eaf0;font:14px/1.45 -apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;text-decoration:none"><span style="display:block;font-size:16px;font-weight:700;color:#e8eaf0">JevHarness</span><span style="display:block;margin:2px 0 8px;font-size:12px;color:#9aa0b1">Community plugin for Grok Build · 1 skill</span><span style="display:block;margin:0 0 10px;color:#c9cdd8">LLM-authored task-specific Jev harnesses with optional full-trajectory reward reflection and GEPA evolution.</span><span style="font-size:12px;font-weight:600;color:#7c9cff">View on GrokStacks →</span></a>Markdown summary
**[JevHarness on GrokStacks](https://grokstacks.com/p/jevharness/)**: Community plugin for Grok Build with 1 skill. Install: `grok plugin install TianyuCodings/JevHarness --trust`More on badges, embeds and keeping your listing up to date: GrokStacks for plugin authors.
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