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PreToolUse

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

A command hook that runs before any coding agent tool is used. It sends the planned tool action to Sponsio's plugin guard for checking.

In plain words
What is it for?
Use it as a pre-tool safety or policy check in an agent configuration. It applies to every tool because its matcher is set to all tools.
Why use it?
It adds a check before tools run, which can help enforce the rules of the Sponsio plugin system. The input does not describe what the guard approves or rejects.

Hook for Claude Code

Written for Claude Code: PreToolUse hook event.

Part of the sponsio-claude-code plugin — 1 skill, 1 hook shipped together

not rated 439repo yesterday A scan tokens not measured original Apache-2.0

Good fit Use it as a pre-tool safety or policy check in an agent configuration. It applies to every tool because its matcher is set to all tools.

Compare 6 hooks from other repositories ↓
Install with agentmods
npx agentmods add hooks/sponsiolabs/sponsio/pre-tool-use
View source ↗ SponsioLabs/Sponsio sponsio.dev
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.

Clone the repo
git clone --depth 1 https://github.com/SponsioLabs/Sponsio

Made for: Claude Code.

Or install sponsio-claude-code, the plugin that ships this one along with the rest of its 1 skill, 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/sponsiolabs/sponsio/pre-tool-use/github.svg)](https://agentmods.dev/hooks/sponsiolabs/sponsio/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/sponsiolabs/sponsio/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/sponsiolabs/sponsio/pre-tool-use/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for PreToolUse

Your own site · 80×15
<a href="https://agentmods.dev/hooks/sponsiolabs/sponsio/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/sponsiolabs/sponsio/pre-tool-use.svg" alt="Reviewed on agentmods" width="80" 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. A grade says what 26 rules found in the file — not that it is safe.
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 9d 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/sponsio-claude-code/hooks/hooks.json · 13 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "*",
      "hooks": [
        {
          "type": "command",
          "command": "sponsio plugin guard --stdin"
        }
      ]
    }
  ]
}
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. 9d ago First seen · 13 lines scan A c7afb3f3bfda

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository SponsioLabs/Sponsio (439 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.

agent-guardrailsagent-harnessagent-runtimeagent-safetyagent-securityagent-skills
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PostToolUse

Runs after a tool call finishes for Write and Edit tool calls, executing format_and_lint.sh. From supabase/supabase.

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PreToolUse

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PreToolUse

Runs before the agent uses a tool, executing pre-write.sh and pre-bash.sh (2 commands). From anthropics/claude-cookbooks.

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