example-governance

A small example plugin showing two automated hooks working together: one runs when a session starts, and another checks Bash commands before they are used. A plugin is an add-on that extends a coding agent's behavior.

In plain words
What is it for?
Use it as a reference when building or testing plugins that run startup setup and apply policies before shell commands.
Why use it?
It provides a minimal example for testing whether setup actions and command-safety checks cooperate correctly.

Plugin for Claude Code

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.

Claude Code
/plugin marketplace add zernie/vigiles
agentmods
npx agentmods add plugins/zernie/vigiles/fixture-plugin
Clone the repo
git clone --depth 1 https://github.com/zernie/vigiles

Made for: Claude Code.

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. Scan, not verified.
Origin original No closer match found in the catalogue.
Security

Grade A, and why

example-governance 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 yesterday.

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.

examples/harness/fixture-plugin/.claude-plugin/plugin.json · 29 lines

What it actually says

{
  "name": "example-governance",
  "version": "1.0.0",
  "description": "A tiny example plugin used to demonstrate cohesion testing — a SessionStart setup hook and a PreToolUse Bash policy gate, working together.",
  "hooks": {
    "SessionStart": [
      {
        "hooks": [
          {
            "type": "command",
            "command": "bash ${CLAUDE_PLUGIN_ROOT}/hooks/setup.sh"
          }
        ]
      }
    ],
    "PreToolUse": [
      {
        "matcher": "Bash",
        "hooks": [
          {
            "type": "command",
            "command": "bash ${CLAUDE_PLUGIN_ROOT}/hooks/guard.sh"
          }
        ]
      }
    ]
  }
}
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. yesterday First seen · 29 lines scan A d7fd250d3746

Subscribe to this mod's changes

example-governance is a plugin published in the GitHub repository zernie/vigiles (15 stars, last pushed yesterday), 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 2026-08-30.