agentmods.dev

PreToolUse

A pre-action hook that runs a Node.js safety script before the agent uses Bash, the command-line tool for running shell commands.

In plain words
What is it for?
Use it to guard Bash commands against unwanted external impact in projects that include the referenced safety script.
Why use it?
It gives the project a chance to check or block shell commands before they can affect files, systems, or external services.

Hook for Claude Code

11 1mo ago A scan tokens not measured copy · 52% MIT
View the source file Global-mindee/WAY
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/global-mindee/way/pre-tool-use
Clone the repo
git clone --depth 1 https://github.com/Global-mindee/WAY

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 52% 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 2d 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

52% identical to SessionStart — 8 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.

.claude/settings.json · 13 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "node \"$CLAUDE_PROJECT_DIR/.claude/hooks/scripts/external-impact-guard.js\""
        }
      ]
    }
  ]
}
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. 2d ago First seen · 13 lines scan A b564441ffaac

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository Global-mindee/WAY (11 stars, last pushed 1mo 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 52% identical to SessionStart, differing in 8 lines, and is treated as a copy.

Securityai-agentsai-harnessclaudeclaude-codehallucination-preventionnon-developer
Related

Other hooks, from other repositories

PreToolUse

Runs before the agent uses a tool for Bash, Skill, Agent, AskUserQuestion, Bash, Write, Edit and MultiEdit tool calls, executing ContextReduction.hook.sh, AgentInvocation.hook.ts, TabState.hook.ts and PreToolGuard.hook.ts (4 commands). From danielmiessler/LifeOS.

danielmiessler/LifeOS · not measured

SessionEnd

Runs when a session ends, executing WorkCompletionLearning.hook.ts, SessionCleanup.hook.ts, UpdateCounts.hook.ts, MemoryHealthGate.hook.ts, DocIntegrity.hook.ts and IntegrityCheck.hook.ts (6 commands). From danielmiessler/LifeOS.

danielmiessler/LifeOS · not measured

PostToolUseFailure

Runs when a tool call fails, executing EventLogger.hook.ts, AlgorithmNudge.hook.ts and LoopDetector.hook.ts (3 commands). From danielmiessler/LifeOS.

danielmiessler/LifeOS · not measured

TaskCreated

Runs on the TaskCreated event, executing TaskGovernance.hook.ts. From danielmiessler/LifeOS.

danielmiessler/LifeOS · not measured

ConfigChange

Runs on the ConfigChange event, executing EventLogger.hook.ts. From danielmiessler/LifeOS.

danielmiessler/LifeOS · not measured

StopFailure

Runs on the StopFailure event, executing EventLogger.hook.ts. From danielmiessler/LifeOS.

danielmiessler/LifeOS · not measured