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PreToolUse

PreToolUse is a hook for coding agents from IgnacioMarin402/spec-flow-plugin. Its token cost is not measured, scanned A, a copy of UserPromptSubmit, MIT.

A set of checks that runs before an AI coding agent uses commands, edits files, or delegates work to another agent. Hooks are automatic actions triggered by those events.

In plain words
What is it for?
Use it in an agent workflow where Bash commands, file edits, task delegation, and agent messages need automatic pre-use controls.
Why use it?
It can stop disallowed commands and enforce project phases or preparation checks before changes and delegated tasks proceed.

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 spec-flow plugin — 2 skills, 3 commands, 5 agents, 4 hooks shipped together

One of 4 entries in hooks.json — they are configured in one file and arrive together.

not rated 2 3d ago A scan tokens not measured copy · 86% MIT
View the source file IgnacioMarin402/spec-flow-plugin
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 IgnacioMarin402/spec-flow-plugin
Claude Code
/plugin install spec-flow

Or install spec-flow, the plugin that ships this one along with the rest of its 2 skills, 3 commands, 5 agents, 4 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/ignaciomarin402/spec-flow-plugin/pre-tool-use.svg)](https://agentmods.dev/hooks/ignaciomarin402/spec-flow-plugin/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/ignaciomarin402/spec-flow-plugin/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/ignaciomarin402/spec-flow-plugin/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 86% 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 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.

Origin

This is a copy

86% identical to UserPromptSubmit — 45 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 · 66 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "node",
          "args": [
            "${CLAUDE_PLUGIN_ROOT}/hooks/no-gate-cmds.mjs"
          ]
        }
      ]
    },
    {
      "matcher": "Bash|Write|Edit",
      "hooks": [
        {
          "type": "command",
          "command": "node",
          "args": [
            "${CLAUDE_PLUGIN_ROOT}/hooks/phase-guard.mjs"
          ]
        }
      ]
    },
    {
      "matcher": "Task|Agent|SendMessage",
      "hooks": [
        {
          "type": "command",
          "command": "node",
          "args": [
            "${CLAUDE_PLUGIN_ROOT}/hooks/preflight.mjs"
          ]
        },
        {
          "type": "command",
          "command": "node",
          "args": [
            "${CLAUDE_PLUGIN_ROOT}/hooks/opus-budget.mjs"
          ]
        },
        {
          "type": "command",
          "command": "node",
          "args": [
            "${CLAUDE_PLUGIN_ROOT}/hooks/arm-gate.mjs"
          ]
        }
      ]
    },
    {
      "matcher": "Task|Agent",
      "hooks": [
        {
          "type": "command",
          "command": "node",
          "args": [
            "${CLAUDE_PLUGIN_ROOT}/hooks/model-route.mjs"
          ]
        }
      ]
    }
  ]
}
Same file

What else hooks.json configures

This page is one entry in a file that holds 4. 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 · 66 lines scan A 2d24206289e0

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository IgnacioMarin402/spec-flow-plugin (2 stars, last pushed 3d 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 86% identical to UserPromptSubmit, differing in 45 lines, and is treated as a copy.

Multi-Agentclaude-codeclaude-code-pluginspec-driven-development
Related

Other hooks, from other repositories

PreToolUse

Runs before the agent uses a tool for Edit, Write, NotebookEdit, Edit, Write, Bash, Agent, Skill, NotebookEdit, SendMessage and TaskUpdate tool calls, running an inline shell check (4 commands). From justinjdev/fellowship.

justinjdev/fellowship · not measured

PreToolUse

Runs before the agent uses a tool for Bash, Write, Edit, MultiEdit and Agent tool calls, executing pre-tool-guard.sh, local-mode-tracking-guard.sh, task-state-guard.sh, lean-comments-guard.sh, parallel-rework-guard.sh, parallel-dispatch-guard.sh and in-flight-marker.sh (7 commands). From OrodruinLabs/nazgul.

OrodruinLabs/nazgul · not measured

SessionEnd

Runs when a session ends, executing session-staging.sh. From OrodruinLabs/nazgul.

OrodruinLabs/nazgul · not measured

TaskCompleted

Runs when a task is marked completed, executing task-completed.sh. From OrodruinLabs/nazgul.

OrodruinLabs/nazgul · not measured

UserPromptSubmit

Runs when you submit a prompt, before the agent sees it, executing prompt-guard.sh. From OrodruinLabs/nazgul.

OrodruinLabs/nazgul · 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