PreToolUse

A set of automatic checks that runs before certain agent actions, such as searching code or editing Python files. It can redirect searches to a codebase-memory tool and report whether a matching test exists before Python code is changed.

In plain words
What is it for?
Use it to add pre-action controls for code searches and Python edits, including test-presence checks and inline shell validation.
Why use it?
It enforces project-specific safeguards at the point where a tool is used. These checks can discourage unsupported search methods and reveal when production Python code is being changed without nearby tests.

Hook for Claude Code

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/ard1102/ip-intelligence/pre-tool-use
Clone the repo
git clone --depth 1 https://github.com/ard1102/ip-intelligence

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 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 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.

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.

.claude/settings.json · 24 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Grep",
      "hooks": [
        {
          "type": "command",
          "command": "echo '{\"decision\": \"block\", \"reason\": \"Use codebase-memory-mcp instead of Grep. Call mcp__codebase-memory-mcp__search_code for text/pattern search, or mcp__codebase-memory-mcp__search_graph for finding functions, classes, and routes by name or query.\"}'",
          "shell": "bash"
        }
      ]
    },
    {
      "matcher": "Write(.*\\.py$)|Edit(.*\\.py$)",
      "hooks": [
        {
          "type": "agent",
          "prompt": "A Python file is about to be written or edited. The tool input contains the file path in the 'file_path' or 'path' key. Check if a corresponding test file exists in tests/: look for tests/test_{basename_without_ext}.py. Report: (1) test file path checked, (2) exists yes/no, (3) if yes — run 'pytest {test_path} -q --tb=no 2>&1 | tail -3' and report pass/fail count, (4) if no — note that writing production code without tests violates TDD. Do NOT block the write — report only.",
          "timeout": 30000
        }
      ]
    }
  ]
}
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. yesterday First seen · 24 lines scan A 647e08aa1676

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository ard1102/ip-intelligence (0 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 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.