groundhog

groundhog is a plugin for Gemini CLI from dmytrome/groundhog. Its token cost is not measured, scanned A, original, MIT.

A web search and reading tool that uses a Chrome browser to gather research sources. It removes text hidden from normal readers, records a SHA-256 receipt for each source, and checks network redirects for unsafe destinations.

In plain words
What is it for?
Use it to search websites, read pages, and collect research with source provenance. It can run its own browser or connect to one you already manage.
Why use it?
It helps an agent research the web while making hidden page content and source history more visible. The redirect check reduces a common risk when fetching web pages.

Plugin for Gemini CLI

Written for Gemini CLI: a Gemini CLI extension manifest.

Good fit Use it to search websites, read pages, and collect research with source provenance. It can run its own browser or connect to one you already manage.

Compare 6 plugins from other repositories ↓
Install with agentmods
npx agentmods add plugins/dmytrome/groundhog/gemini-extension
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/dmytrome/groundhog

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.

agentmods badge for groundhog

README.md
[![agentmods](https://agentmods.dev/badge/plugins/dmytrome/groundhog/gemini-extension/github.svg)](https://agentmods.dev/plugins/dmytrome/groundhog/gemini-extension)
Your own site
<a href="https://agentmods.dev/plugins/dmytrome/groundhog/gemini-extension"><img src="https://agentmods.dev/badge/plugins/dmytrome/groundhog/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.

agentmods 80×15 button for groundhog

Your own site · 80×15
<a href="https://agentmods.dev/plugins/dmytrome/groundhog/gemini-extension"><img src="https://agentmods.dev/badge/plugins/dmytrome/groundhog/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

groundhog 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 10d ago.

The scan reads gemini-extension.json. This mod also ships 5 executable files (examples/playwright-node/index.mjs, examples/playwright-python/main.py, examples/puppeteer/index.mjs, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.json · 44 lines

What it actually says

{
  "name": "groundhog",
  "version": "0.22.0",
  "description": "Web search, read and research through a real stealth-patched Chrome. Text hidden from human readers is stripped before the model reads it and reported, every source carries a SHA-256 provenance receipt, and the SSRF guard is re-checked after redirects.",
  "mcpServers": {
    "groundhog": {
      "command": "uvx",
      "args": ["groundhog-mcp"]
    }
  },
  "settings": [
    {
      "name": "CDP URL",
      "description": "CDP endpoint of a browser you already run, e.g. http://127.0.0.1:9222. Leave unset and Groundhog starts your installed Chrome itself, headless and in its own profile.",
      "envVar": "CDP_URL",
      "sensitive": false
    },
    {
      "name": "Auto-start the browser",
      "description": "Set to false to manage the browser yourself. Defaults to true.",
      "envVar": "GROUNDHOG_AUTO_START_BROWSER",
      "sensitive": false
    },
    {
      "name": "Browser",
      "description": "chrome (default: your installed Chrome, no Docker needed) or stealth (the hardened browser container, needs Docker or Podman).",
      "envVar": "GROUNDHOG_BROWSER",
      "sensitive": false
    },
    {
      "name": "SearXNG URL",
      "description": "Your SearXNG instance for search, e.g. http://searxng:8080. Unset falls back to rendering a search page through the stealth browser.",
      "envVar": "SEARXNG_URL",
      "sensitive": false
    },
    {
      "name": "Token budget",
      "description": "Tokens of content returned before truncation. Defaults to 20000.",
      "envVar": "GROUNDHOG_MAX_TOKENS",
      "sensitive": false
    }
  ]
}
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.

  1. 10d ago Changed ea0d45d7c89d
  2. 11d ago Changed c85b6a42d5a9
  3. 13d ago Changed a732d0e865ac
  4. 14d ago Changed 3f7ccf52d6a1
  5. 16d ago Changed 9582b405d2bf
  6. 1mo ago Changed · +6 lines a1ee63157420
  7. 1mo ago Changed d5ddb3920925
  8. 1mo ago Changed 96c4c96db7ab
  9. 1mo ago Changed 92da342a8b1e
  10. 1mo ago First seen · 38 lines scan A 633e9a01772c

Subscribe to this mod's changes

groundhog is a plugin published in the GitHub repository dmytrome/groundhog (1 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 2026-09-07.

Related

groundhog compared with plugins from other repositories

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tauri-mcp-clihypothesi/mcp-server-tauriPlugin33315d agoMITA—Claude Code
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claw-muxLeeJuOh/claude-code-zeroPlugin5224d agoMITA—Claude Code
cdpilotmehmetnadir/cdpilotPlugin3321d agoMITA—Claude Code