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PreToolUse

PreToolUse is a hook for Claude Code from ProductOfAmerica/mcp-server-kicad. Its token cost is not measured, scanned A, original, MIT.

A safety hook that checks file operations before Claude Code reads, writes, or edits KiCad project files. It blocks direct access to KiCad file types and points the agent to KiCad MCP tools instead.

In plain words
What is it for?
It protects schematic, PCB, symbol, footprint, project, and related KiCad files during Read, Write, and Edit operations.
Why use it?
It prevents KiCad files from being changed through ordinary file operations that could bypass the available KiCad tools.

Hook for Claude Code

Written for Claude Code: PreToolUse hook event.

Part of the kicad plugin — 6 skills, 1 agent, 2 hooks, 1 MCP server shipped together

One of 2 entries in hooks.json upstream. Installing this one merges just its entry into your config; the other 1 are separate, each on its own page.

not rated 8repo +3 26d ago A scan tokens not measured original MIT

Good fit It protects schematic, PCB, symbol, footprint, project, and related KiCad files during Read, Write, and Edit operations.

Compare 6 hooks from other repositories ↓
Install with agentmods
npx agentmods add hooks/productofamerica/mcp-server-kicad/pre-tool-use
View source ↗ ProductOfAmerica/mcp-server-kicad pypi.org
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/ProductOfAmerica/mcp-server-kicad

Made for: Claude Code.

Or install kicad, the plugin that ships this one along with the rest of its 6 skills, 1 agent, 2 hooks, 1 MCP server.

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/productofamerica/mcp-server-kicad/pre-tool-use/github.svg)](https://agentmods.dev/hooks/productofamerica/mcp-server-kicad/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/productofamerica/mcp-server-kicad/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/productofamerica/mcp-server-kicad/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/productofamerica/mcp-server-kicad/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/productofamerica/mcp-server-kicad/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 10d 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 · 15 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Read|Write|Edit",
      "hooks": [
        {
          "type": "command",
          "command": "node -e \"const d=JSON.parse(require('fs').readFileSync(0,'utf-8'));if(d.hook_event_name==='PreToolUse'&&['Read','Write','Edit'].includes(d.tool_name)){const f=(d.tool_input||{}).file_path||(d.tool_input||{}).path||'';if(['.kicad_sch','.kicad_pcb','.kicad_sym','.kicad_mod','.kicad_pro','.kicad_prl'].some(e=>f.endsWith(e)))console.log(JSON.stringify({decision:'block',reason:'BLOCKED: Use kicad MCP tools (add_symbol, create_schematic, place_symbol, add_wire, etc.) instead of '+d.tool_name+' on '+f}))}\"",
          "timeout": 3000,
          "statusMessage": "Validating KiCad file access..."
        }
      ]
    }
  ]
}
Same file

What else hooks.json configures

This page is one entry in a file that holds 2. 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. 10d ago First seen · 15 lines scan A 5b0588318fe5

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository ProductOfAmerica/mcp-server-kicad (8 stars, last pushed 26d 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.

Claude CodeHardware and IoTSecurityaiclaudedrcedaelectronics
Related

Other hooks, from other repositories

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

SessionStart

Runs when a session starts on startup, executing install_pkgs.sh. From supabase/supabase.

supabase/supabase · not measured

SessionStart

Runs when a session starts, executing on-start.js via node. From google-gemini/gemini-cli.

google-gemini/gemini-cli · not measured

PreToolUse

Runs before the agent uses a tool for Bash tool calls, running an inline shell check. From apache/superset.

apache/superset · not measured

PreToolUse

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

anthropics/claude-cookbooks · not measured

PreToolUse

Runs before the agent uses a tool for Bash tool calls, executing enforce-tools.mjs via node. From prisma/orm.

prisma/orm · not measured