agentmods.dev

PreToolUse

A set of checks that runs before the agent edits files, writes files, or executes shell commands. It uses Node.js scripts to protect files, warn about large files, and block dangerous commands.

In plain words
What is it for?
Use it to add safety checks around file changes and terminal commands made by the agent.
Why use it?
It helps catch risky actions before they change your project or run harmful commands.

Hook for Claude Code

5 4mo ago A scan tokens not measured no licence
View the source file zebbern/termstack
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.

agentmods
npx agentmods add hooks/zebbern/termstack/pre-tool-use
Clone the repo
git clone --depth 1 https://github.com/zebbern/termstack

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 unknown No closer match found in the catalogue.
Security

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 yesterday.

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.

.claude/settings.json · 32 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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 · 32 lines scan A b60c613cfc17

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository zebbern/termstack (5 stars, last pushed 4mo ago), with no licence file. 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 2026-08-31.

Data and AIGLMaiclaudeclaude-codecodex-clicoding-agent
Related

Other hooks, from other repositories

PreToolUse

Runs before the agent uses a tool for ^Bash$ tool calls, executing codex-rtk-hook.mjs via node. From HECer/yoke.

HECer/yoke · not measured

Stop

Runs when the agent finishes a response, executing speak-notify.sh. From maxanatsko/agentic-voice.

maxanatsko/agentic-voice · not measured

Notification

Runs when the agent sends a notification, executing speak-notify.sh. From maxanatsko/agentic-voice.

maxanatsko/agentic-voice · not measured

PermissionRequest

Runs when the agent asks permission for an action, executing speak-notify.sh. From maxanatsko/agentic-voice.

maxanatsko/agentic-voice · not measured

PostToolUse

Runs after a tool call finishes for Edit and Write tool calls, executing post-edit-yaml-check.sh and post-edit-terraform-check.sh via bash (2 commands). From qwedsazxc78/devops-ai-skill.

qwedsazxc78/devops-ai-skill · not measured

PostToolUse

Runs after a tool call finishes for Write and Edit tool calls, executing format_and_lint.sh. From supabase/supabase.

supabase/supabase · not measured