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PreToolUse

PreToolUse is a hook for coding agents from AgentBuildersApp/eight-eyes. Its token cost is not measured, scanned A, original, MIT.

An automated check that runs before a coding agent uses file-writing, editing, or shell-command tools. It starts a Python script supplied by the collaboration setup.

In plain words
What is it for?
It helps attach pre-action processing to Write, Edit, MultiEdit, and Bash tool calls.
Why use it?
It creates a place to inspect or record an action before it happens, although the input does not say what the script itself checks.

Hook

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 8eyes plugin — 2 skills, 2 commands, 8 agents, 7 hooks shipped together

One of 7 entries in hooks.json — they are configured in one file and arrive together.

not rated 2 1mo ago A scan tokens not measured original MIT
View the source file AgentBuildersApp/eight-eyes
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 AgentBuildersApp/eight-eyes
Claude Code
/plugin install 8eyes

Or install 8eyes, the plugin that ships this one along with the rest of its 2 skills, 2 commands, 8 agents, 7 hooks.

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/agentbuildersapp/eight-eyes/pre-tool-use.svg)](https://agentmods.dev/hooks/agentbuildersapp/eight-eyes/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/agentbuildersapp/eight-eyes/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/agentbuildersapp/eight-eyes/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 3d 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.

hooks/hooks.json · 13 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Write|Edit|MultiEdit|Bash",
      "hooks": [
        {
          "type": "command",
          "command": "python3 ${CLAUDE_PLUGIN_ROOT}/hooks/scripts/collab_pre_tool.py"
        }
      ]
    }
  ]
}
Same file

What else hooks.json configures

This page is one entry in a file that holds 7. Installing the file brings all of them; each is measured and scanned on its own page.

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. 3d ago First seen · 13 lines scan A b21402ce026b

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository AgentBuildersApp/eight-eyes (2 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. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

ai-code-reviewclaude-codecodex-clicopilot-clidefense-in-depth
Related

Other hooks, from other repositories

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Runs when a session starts on compact, executing post-compact-context.py, map-memory-finalize.py and map-memory-recall.py (3 commands). From azalio/map-framework.

azalio/map-framework · not measured

UserPromptSubmit

Runs when you submit a prompt, before the agent sees it, executing license_prompt_guard.py and run_if_licensed.py via uv with --no-project, --python and --exec (3 commands). From maxritter/pilot-shell.

maxritter/pilot-shell · not measured

PreToolUse

Runs before the agent uses a tool for ^new_context$ tool calls, executing launch.py via python3. From hehee9/codex-compressor.

hehee9/codex-compressor · not measured

PostToolUseFailure

Runs when a tool call fails, executing EventLogger.hook.ts and AlgorithmNudge.hook.ts (2 commands). From DorShaer/Husk.

DorShaer/Husk · not measured

SessionStart

Runs when a session starts, running "/path/to/shipworthy/hooks/session-start". From Vimalk0703/shipworthy.

Vimalk0703/shipworthy · not measured

PostToolUse

Runs after a tool call finishes for Edit and Write tool calls, executing format-ts.sh. From yu-iskw/coding-agent-fabric.

yu-iskw/coding-agent-fabric · not measured