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PreToolUse

PreToolUse is a hook for Claude Code from aws/agent-toolkit-for-aws. Its token cost is not measured, scanned A, original, Apache-2.0.

A pre-tool security hook that runs a secret-safety script before Bash, AWS, and AWS-related MCP tool calls.

In plain words
What is it for?
Use it in AWS-focused agent workflows to apply the same secret-safety check before shell commands and AWS operations.
Why use it?
It checks commands and AWS tool use before execution, helping catch possible secret-handling risks during agent work.

Hook for Claude Code

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the aws-core plugin — 24 skills, 1 hook shipped together

not rated 2.5k +21 yesterday A scan tokens not measured original Apache-2.0
View the source file aws/agent-toolkit-for-aws
Install

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.

Claude Code
/plugin marketplace add aws/agent-toolkit-for-aws
Claude Code
/plugin install aws-core

Made for: Claude Code.

Or install aws-core, the plugin that ships this one along with the rest of its 24 skills, 1 hook.

Wrote 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.

agentmods badge for PreToolUse

README.md
[![agentmods](https://agentmods.dev/badge/hooks/aws/agent-toolkit-for-aws/pre-tool-use.svg)](https://agentmods.dev/hooks/aws/agent-toolkit-for-aws/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/aws/agent-toolkit-for-aws/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/aws/agent-toolkit-for-aws/pre-tool-use.svg" alt="Measured on agentmods" height="20"></a>
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 original 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 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.

plugins/aws-core/com.anthropic.claude-code/hooks/hooks.json · 24 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "python3 \"${CLAUDE_PLUGIN_ROOT}/com.anthropic.claude-code/hooks/secret-safety.py\"",
          "timeout": 5
        }
      ]
    },
    {
      "matcher": "use_aws|mcp__aws.*|mcp__plugin_.*aws-mcp.*",
      "hooks": [
        {
          "type": "command",
          "command": "python3 \"${CLAUDE_PLUGIN_ROOT}/com.anthropic.claude-code/hooks/secret-safety.py\"",
          "timeout": 5
        }
      ]
    }
  ]
}
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. 4d ago First seen · 24 lines scan A 78ccf951c8c5

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository aws/agent-toolkit-for-aws (2,498 stars, last pushed yesterday), 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.

Security
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