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.
npx agentmods add hooks/gnt-ai/gnt/pre-tool-usegit clone --depth 1 https://github.com/gnt-ai/gntWrote 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/gnt-ai/gnt/pre-tool-use)<a href="https://agentmods.dev/hooks/gnt-ai/gnt/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/gnt-ai/gnt/pre-tool-use.svg" alt="Measured on agentmods" height="20"></a>Grade A, and why
PreToolUse 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 5d 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
{
"PreToolUse": [
{
"matcher": ".*",
"hooks": [
{
"type": "command",
"command": "gnt hooks check-action",
"timeout": 20,
"statusMessage": "Checking company policy..."
}
]
}
]
}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.
- 5d ago First seen · 15 lines scan A 7ea1a7c7fc1b
PreToolUse is a hook published in the GitHub repository gnt-ai/gnt (29 stars, last pushed 2d 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. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other hooks, from other repositories
Stop
Runs when the agent finishes a response, executing sage-stop.sh via bash. From l33tdawg/sage.
Stop
Runs when the agent finishes a response, executing stop_report_hook.sh, tmux_signal_stop_receipt.sh and session_stop_rotation.py via bash with --show-toplevel (3 commands). From Vinix24/vnx-orchestration.
PreToolUse
Runs before the agent uses a tool for Bash, shell_command, exec_command, unified_exec, apply_patch, Write and Edit tool calls, executing pre-tool-adapter.py via python3 (2 commands). From arbiterForge/codeArbiter.
Stop
Runs when the agent finishes a response, running node. From tractorjuice/arckit-claude.
PermissionRequest
Runs when the agent asks permission for an action for mcp__.* tool calls, running node. From tractorjuice/arckit-claude.
SessionEnd
Runs when a session ends for clear, prompt_input_exit, logout, resume, bypass_permissions_disabled and other tool calls, running an inline shell check. From QORIS-AI/knox.