agentmods.dev

PreToolUse

A pre-action hook that runs a shell script before an agent edits or writes a file.

In plain words
What is it for?
It helps enforce repository rules on Edit and Write operations in the greppable coding-agent plugin.
Why use it?
It provides a rule check before file changes are made, helping catch violations early.

Hook

3 4mo ago A scan tokens not measured original MIT
View the source file greppable/greppable-cc-plugin
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/greppable/greppable-cc-plugin/pre-tool-use
Clone the repo
git clone --depth 1 https://github.com/greppable/greppable-cc-plugin
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 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.

hooks/hooks.json · 14 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Edit|Write",
      "hooks": [
        {
          "type": "command",
          "command": "${CLAUDE_PLUGIN_ROOT}/hooks/pre-rules-check.sh",
          "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.

  1. 2d ago First seen · 14 lines scan A 37d8fbccf272

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository greppable/greppable-cc-plugin (3 stars, last pushed 4mo 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.

ai-agentsclaude-codeclaude-code-plugincode-searchgdlgrep
Related

Other hooks, from other repositories

PreToolUse

Runs before the agent uses a tool for Read tool calls, executing run_hook.py via python. From haxo98098/slicegrep.

haxo98098/slicegrep · not measured

SessionStart

Runs when a session starts, executing install_engine.py via python3. From study8677/repobrain.

study8677/repobrain · not measured

SessionStart

Runs when a session starts, executing ensure-deps.js, sync.js and session-context.js via node (3 commands). From sagarmk/beacon-plugin.

sagarmk/beacon-plugin · not measured

PostToolUse

Runs after a tool call finishes for Write, Edit, MultiEdit and Bash tool calls, executing embed-file.js and gc.js via node (2 commands). From sagarmk/beacon-plugin.

sagarmk/beacon-plugin · not measured

CwdChanged

Runs on the CwdChanged event, executing cwd-changed.sh. From dvcdsys/code-index.

dvcdsys/code-index · not measured

Stop

Runs when the agent finishes a response, running an inline shell check. From roomi-fields/rtfm.

roomi-fields/rtfm · not measured