A pre-tool hook that runs a Node.js script before Bash commands are used by the agent.

It is for projects that need a Bash pre-use hook connected to the KodingDev/meridian script.

It lets a project apply checks or setup actions before shell commands run, although the input does not specify what those actions are.

PreToolUse — Hook by KodingDev

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.

agentmods

npx agentmods add hooks/kodingdev/meridian/pre-tool-use

Clone the repo

git clone --depth 1 https://github.com/KodingDev/meridian

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 1 finding. Scan, not verified.

Origin 94% copy Near-identical to another mod in the catalogue.

Security

Grade A, and why

PreToolUse scanned grade A with 1 finding 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 yesterday.

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.

Runs shell commandslowCapability

Expected in a hook, worth knowing in a rule or an instructions file.

"command": "node -e \"let r=process.env.CLAUDE_PLUGIN_ROOT||process.env.PLUGIN_ROOT;if(!r)process.exit(0);let cp=require('child_process');if(process.platform==='linux'&&/^[a-zA-Z]:/.test(r)){try{r=cp.execFileSync('wslpat

Origin

This is a copy

94% identical to SessionStart — 6 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 · 14 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "node -e \"let r=process.env.CLAUDE_PLUGIN_ROOT||process.env.PLUGIN_ROOT;if(!r)process.exit(0);let cp=require('child_process');if(process.platform==='linux'&&/^[a-zA-Z]:/.test(r)){try{r=cp.execFileSync('wslpath',['-u',r],{encoding:'utf8'}).trim()}catch{r='/mnt/'+r[0].toLowerCase()+r.slice(2).split(String.fromCharCode(92)).join('/')}}cp.execFileSync(process.execPath,[r+'/hooks/pre-tool-use.mjs'],{stdio:'inherit'})\"",
          "async": false
        }
      ]
    }
  ]
}

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.

yesterday First seen · 14 lines scan A 7951579ac398

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository KodingDev/meridian (5 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 1 finding (runs shell commands). It is 94% identical to SessionStart, differing in 6 lines, and is treated as a copy.

PreToolUse

Getting it into your agent

Grade A, and why

Runs shell commandslowCapability

This is a copy

What it actually says

What this file has done since we first saw it

Other hooks, from other repositories

PostToolUse

SessionStart

SessionStart

PreToolUse

SessionStart

SessionStart