agentmods.dev

PreToolUse

A set of commands that run before shell commands or file edits, checking safety, recording activity, rewriting commands, reviewing pull-request conditions, and scanning for security patterns.

In plain words
What is it for?
Protecting Bash, Edit, and Write operations with safety checks, logging, command handling, pull-request gates, and security scans.
Why use it?
It adds automated checks and an audit trail around agent actions, helping catch unsafe operations and configuration or code risks early.

Hook

5 13d ago A scan tokens not measured copy · 66% MIT
View the source file 5uck1ess/devkit
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/5uck1ess/devkit/pre-tool-use
Clone the repo
git clone --depth 1 https://github.com/5uck1ess/devkit
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 66% copy Near-identical to another mod 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.

Origin

This is a copy

66% identical to SessionStart — 76 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 · 81 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "${CLAUDE_PLUGIN_ROOT}/hooks/safety-check.sh",
          "statusMessage": "Safety check...",
          "timeout": 10
        }
      ]
    },
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "${CLAUDE_PLUGIN_ROOT}/hooks/audit-trail.sh",
          "statusMessage": "Logging command...",
          "timeout": 5
        }
      ]
    },
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "${CLAUDE_PLUGIN_ROOT}/hooks/rtk-rewrite.sh",
          "statusMessage": "RTK optimize...",
          "timeout": 5
        }
      ]
    },
    {
      "matcher": "Edit|Write",
      "hooks": [
        {
          "type": "command",
          "command": "${CLAUDE_PLUGIN_ROOT}/hooks/safety-check.sh",
          "statusMessage": "Checking file safety...",
          "timeout": 10
        }
      ]
    },
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "${CLAUDE_PLUGIN_ROOT}/hooks/pr-gate.sh",
          "statusMessage": "PR check...",
          "timeout": 5
        }
      ]
    },
    {
      "matcher": "Edit|Write",
      "hooks": [
        {
          "type": "command",
          "command": "${CLAUDE_PLUGIN_ROOT}/hooks/security-patterns.sh",
          "statusMessage": "Security check...",
          "timeout": 5
        }
      ]
    },
    {
      "matcher": "*",
      "hooks": [
        {
          "type": "command",
          "command": "${CLAUDE_PLUGIN_ROOT}/hooks/devkit-guard.sh",
          "statusMessage": "Workflow guard...",
          "timeout": 10
        }
      ]
    }
  ]
}
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 · 81 lines scan A 9edc6cbff0ca

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository 5uck1ess/devkit (5 stars, last pushed 13d 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. It is 66% identical to SessionStart, differing in 76 lines, and is treated as a copy.

Code reviewMulti-AgentProductivitySecurityai-agentsclaude-codecode-qualitydeveloper-tools
Related

Other hooks, from other repositories

PreToolUse

Runs before the agent uses a tool for Write and Edit tool calls, executing dependency-guard.sh and no-any-types.sh via python3 (2 commands). From leocder07/spectra.

leocder07/spectra · not measured

PostToolUse

Runs after a tool call finishes for Write and Edit tool calls, running an inline shell check (2 commands). From leocder07/spectra.

leocder07/spectra · not measured

PreToolUse

Runs before the agent uses a tool for Edit and Write tool calls, executing enforce-ownership.sh. From Sh3rd3n/megazord.

Sh3rd3n/megazord · not measured

SessionStart

Runs when a session starts, executing session-start.sh. From Sh3rd3n/megazord.

Sh3rd3n/megazord · not measured

TaskCompleted

Runs when a task is marked completed, executing on-task-completed.sh. From Chorus-AIDLC/Chorus.

Chorus-AIDLC/Chorus · not measured

PreToolUse

Runs before the agent uses a tool for Bash tool calls, executing reviewer_bash_filter.py via python3. From JairoTorregrosa/jaiskills.

JairoTorregrosa/jaiskills · not measured