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SessionStart

SessionStart is a hook for Claude Code from NeuroverseOS/Neuroverseos-governance. Its token cost is not measured, scanned A, a copy of UserPromptSubmit, Apache-2.0.

A session-start hook that runs a governance script when a coding-agent session begins. The script takes a snapshot before the agent starts work.

In plain words
What is it for?
Use it to run the rulebook guard at the beginning of each agent session.
Why use it?
It creates a defined starting point for tracking or applying the project's chatbot governance rules.

Hook for Claude Code

Written for Claude Code: ${CLAUDE_PLUGIN_ROOT} variable.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the govern-my-chatbot plugin — 1 skill, 4 hooks shipped together

One of 4 entries in hooks.json upstream. Installing this one merges just its entry into your config; the other 3 are separate, each on its own page.

not rated 2repo 5d ago A scan tokens not measured copy · 88% Apache-2.0

Good fit Use it to run the rulebook guard at the beginning of each agent session.

Compare 6 hooks from other repositories ↓
View source ↗ NeuroverseOS/Neuroverseos-governance neuroverseos.com
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add NeuroverseOS/Neuroverseos-governance
Claude Code
/plugin install govern-my-chatbot

Made for: Claude Code.

Or install govern-my-chatbot, the plugin that ships this one along with the rest of its 1 skill, 4 hooks.

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 SessionStart

README.md
[![agentmods](https://agentmods.dev/badge/hooks/neuroverseos/neuroverseos-governance/session-start/github.svg)](https://agentmods.dev/hooks/neuroverseos/neuroverseos-governance/session-start)
Your own site
<a href="https://agentmods.dev/hooks/neuroverseos/neuroverseos-governance/session-start"><img src="https://agentmods.dev/badge/hooks/neuroverseos/neuroverseos-governance/session-start/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 SessionStart

Your own site · 80×15
<a href="https://agentmods.dev/hooks/neuroverseos/neuroverseos-governance/session-start"><img src="https://agentmods.dev/badge/hooks/neuroverseos/neuroverseos-governance/session-start.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 88% copy Near-identical to another mod in the catalogue.
Security

Grade A, and why

SessionStart 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 19d ago.

A static scan of the commands this hook runs, not an audit. A hook is shell that executes on your machine at the event it names, which is why every command in it is printed with what was found.

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.

Origin

This is a copy

88% identical to UserPromptSubmit — 4 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

hooks/hooks.json · 12 lines

What it actually says

{
  "SessionStart": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "node \"${CLAUDE_PLUGIN_ROOT}/skills/govern-my-chatbot/hooks/rulebook-guard.mjs\" snapshot || true"
        }
      ]
    }
  ]
}
Same file

What else hooks.json configures

This page is one entry in a file that holds 4. Installing the file brings all of them; each is measured and scanned on its own page.

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. 19d ago First seen · 12 lines scan A 8594e380ce6b

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository NeuroverseOS/Neuroverseos-governance (2 stars, last pushed 5d ago), licensed Apache-2.0. Its token cost is not measured: a hook is shell that never enters the context. A static security scan graded it A with 0 findings. It is 88% identical to UserPromptSubmit, differing in 4 lines, and is treated as a copy.

AI SafetyBuilding agentsSecurityagent-frameworkaiai-agentsai-governanceai-guardrails
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