What is harness-gemini?

A setup package for Gemini CLI, a command-line tool for working with an AI coding agent. It adds slash commands, a connection to the Harness MCP server, and a GEMINI.md file for shared instructions.

Use it to configure Gemini CLI with Harness commands, the Harness tool server, and personas or skills described in GEMINI.md.

It gives Gemini CLI a defined place for commands, tool connections, and project guidance instead of leaving those settings scattered.

harness-gemini — Plugin for Gemini CLI by Intense-Visions

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo

git clone --depth 1 https://github.com/Intense-Visions/harness-engineering

Made for: Gemini CLI.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/plugins/intense-visions/harness-engineering/gemini-extension/github.svg)](https://agentmods.dev/plugins/intense-visions/harness-engineering/gemini-extension)

Your own site

<a href="https://agentmods.dev/plugins/intense-visions/harness-engineering/gemini-extension"><img src="https://agentmods.dev/badge/plugins/intense-visions/harness-engineering/gemini-extension/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/plugins/intense-visions/harness-engineering/gemini-extension"><img src="https://agentmods.dev/badge/plugins/intense-visions/harness-engineering/gemini-extension.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

harness-gemini scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 20d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.gemini-extension/gemini-extension.json · 13 lines

What it actually says

{
  "name": "harness-gemini",
  "version": "0.1.0",
  "description": "Harness for Gemini CLI — /harness:* slash commands and the harness MCP server, plus a GEMINI.md context document covering personas and skills. Sibling extensions exist for Claude Code, Cursor, and Codex.",
  "contextFileName": "GEMINI.md",
  "mcpServers": {
    "harness": {
      "command": "npx",
      "args": ["-y", "-p", "@harness-engineering/[email protected]", "harness-mcp"]
    }
  }
}

Files

What ships with it

60 files beside gemini-extension.json in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

20d ago Changed 3bfaaece6e2f
1mo ago Changed 81622e3b3bb4
1mo ago Changed 57f03f6f85ab
1mo ago Changed 7e0d8a8102b6
2mo ago Changed 8a1f1cba63d4
2mo ago Changed 78e33674c6bf
2mo ago First seen · 13 lines scan A 1a47f8c11da0

Subscribe to this mod's changes

harness-gemini is a plugin published in the GitHub repository Intense-Visions/harness-engineering (23 stars, last pushed today), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-06.

Building agents

harness-gemini next to 6 plugins from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
harness-geminiIntense-Visions/harness-engineering	Plugin	23	today	MIT	A	—	Gemini CLI
humanizerblader/humanizer	Plugin	67k	12d ago	MIT	A	—	Claude Code
claude-plugins-official marketplaceanthropics/claude-plugins-official	Plugin	47k	today	Apache-2.0	A	—	Claude Code
nextjsvercel/next.js	Plugin	143k	today	MIT	A	—	Claude Code
themes-examplegoogle-gemini/gemini-cli	Plugin	109k	today	Apache-2.0	A	—	Gemini CLI
knowledge-work-plugins marketplaceanthropics/knowledge-work-plugins	Plugin	35k	3d ago	Apache-2.0	A	—	Claude Code
code-modernizationanthropics/claude-plugins-official	Plugin	47k	today	Apache-2.0	A	—	Claude Code