A pre-use safety check that runs before the agent reads files or uses Bash, Read, Glob, Write, or Edit tools. It examines commands and file operations for repository rules and guidance.

Use it to enforce checks before searching code, reading project files, writing files, or attempting guarded Git operations such as pushing or merging.

It helps prevent unsafe commands, unauthorized changes outside the repository, and searches that skip the project's required knowledge graph.

PreToolUse — Hook by Vit129

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/vit129/agy-plugin-cc/pre-tool-use

Clone the repo

git clone --depth 1 https://github.com/Vit129/agy-plugin-cc

Made for: Claude Code.

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 100% 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 2d 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

100% identical to PreToolUse — 0 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.

.claude/settings.json · 22 lines

How it starts

The opening of the file, as written. The whole thing — 22 lines — stays where its author put it; the contents beside it link to each section on GitHub.

{
  "PreToolUse": [
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "CMD=$(python3 -c \"import json,sys; d=json.load(sys.stdin); print(d.get('tool_input',d).get('command',''))\" 2>/dev/null || true); case \"$CMD\" in *grep*|*rg\\ *|*ripgrep*|*find\\ *|*fd\\ *|*ack\\ *|*ag\\ *)   [ -f graphify-out/graph.json ] &&   echo '{\"hookSpecificOutput\":{\"hookEventName\":\"PreToolUse\",\"additionalContext\":\"MANDATORY: graphify-out/graph.json exists. You MUST run `graphify query \\\"<question>\\\"` before grepping raw files. Only grep after graphify has oriented you, or to modify/debug specific lines.\"}}'   || true ;; esac"
        }
      ]
    },
    {
      "matcher": "Read|Glob",
      "hooks": [
        {
          "type": "command",
          "command": "HIT=$(python3 -c \"import json,sys;d=json.load(sys.stdin);t=d.get('tool_input',d);exts=('.py','.js','.ts','.tsx','.jsx','.astro','.vue','.svelte','.go','.rs','.java','.rb','.c','.h','.cpp','.hpp','.cc','.cs','.kt','.swift','.php','.scala','.lua','.sh','.md','.rst','.txt','.mdx');vals=[str(t.get('file_path') or ''),str(t.get('pattern') or ''),str(t.get('path') or '')];j=' '.join(vals).lower().replace(chr(92),'/');tails=[('.'+x.rsplit('.',1)[-1]) for v in vals if v for x in [v.lower().replace(chr(92),'/').rsplit('/',1)[-1]] if '.' in x];sys.stdout.write('1' if 'graphify-out/' not in j and any(tl in exts for tl in tails) else '')\" 2>/dev/null || true); if [ \"$HIT\" = 1 ] && [ -f graphify-out/graph.json ]; then echo '{\"hookSpecificOutput\":{\"hookEventName\":\"PreToolUse\",\"additionalContext\":\"MANDATORY: graphify-out/graph.json exists. You MUST run graphify before reading source files. Use: `graphify query \\\"<question>\\\"` (scoped subgraph), `graphify explain \\\"<concept>\\\"`, or `graphify path \\\"<A>\\\" \\\"<B>\\\"`. Only read raw files after graphify has oriented you, or to modify/debug specific lines. This rule applies to subagents too — include

Read the full file on GitHub · 22 lines

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.

2d ago First seen · 22 lines scan A 175ccf2d7ef7

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository Vit129/agy-plugin-cc (5 stars, last pushed 9d 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 100% identical to PreToolUse, differing in 0 lines, and is treated as a copy.

Git and workflow Research Writing and docs agy antigravity antigravity-ide claude-code claude-code-plugin google-antigravity

PreToolUse

Getting it into your agent

Grade A, and why

Nothing flagged

This is a copy

How it starts

What this file has done since we first saw it

Other hooks, from other repositories

SessionStart

SessionStart

SessionEnd

PostToolUse

SessionStart

PostToolUse