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.
/plugin marketplace add 0xhimanshu/governor/plugin install governorWrote 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.
[](https://agentmods.dev/hooks/0xhimanshu/governor/session-start)<a href="https://agentmods.dev/hooks/0xhimanshu/governor/session-start"><img src="https://agentmods.dev/badge/hooks/0xhimanshu/governor/session-start.svg" alt="Measured on agentmods" height="20"></a>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 4d 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.
What it actually says
{
"SessionStart": [
{
"hooks": [
{
"type": "command",
"command": "python3 \"${CLAUDE_PLUGIN_ROOT}/scripts/governor.py\" hook session-start",
"timeout": 5,
"statusMessage": "Loading Governor mode..."
}
]
}
]
}What else hooks.json configures
This page is one entry in a file that holds 5. Installing the file brings all of them; each is measured and scanned on its own page.
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.
- 4d ago First seen · 14 lines scan A 6bbc4a737cf2
SessionStart is a hook published in the GitHub repository 0xhimanshu/governor (133 stars, last pushed 2mo ago), licensed MIT. 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. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other hooks, from other repositories
PostCompact
Runs after the context is compacted, running echo 'REMINDERS (things linters dont catch): 1) Verify all s. From tomasz-tomczyk/crit.
PermissionRequest
Runs when the agent asks permission for an action for ExitPlanMode tool calls, running crit plan-hook. From tomasz-tomczyk/crit.
PreToolUse
Runs before the agent uses a tool for Bash tool calls, executing pre-tool-use.sh. From mpecan/tokf.
PostToolUse
Runs after a tool call finishes for Edit and Write tool calls, executing check-tools-manifest-sync.sh. From PierreJanineh/TechDebtMCP.
PostToolUse
Runs after a tool call finishes for Edit, MultiEdit, Edit, MultiEdit, Write, Edit, MultiEdit and Edit tool calls, running an inline shell check (5 commands). From luminarylane/fal-mcp-server.
PreToolUse
Runs before the agent uses a tool for WebSearch, Edit, MultiEdit, Edit, MultiEdit and Write tool calls, running an inline shell check (3 commands). From luminarylane/fal-mcp-server.