agentmods.dev

PreToolUse

A pre-tool hook that runs a Node.js script before Write, Edit, or Bash operations by the agent.

In plain words
What is it for?
Use it to trigger the configured claude-hook.js script before the agent writes files, edits files, or executes shell commands.
Why use it?
It lets the project check or control file edits and shell commands before they run.

Hook

25 15d ago A scan tokens not measured original MIT
View the source file sgroy10/speclock
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/sgroy10/speclock/pre-tool-use
Clone the repo
git clone --depth 1 https://github.com/sgroy10/speclock
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": "Write|Edit|Bash",
      "hooks": [
        {
          "type": "command",
          "command": "node \"${CLAUDE_PLUGIN_ROOT}/scripts/claude-hook.js\"",
          "timeout": 30
        }
      ]
    }
  ]
}
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 b0afd8136482

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository sgroy10/speclock (25 stars, last pushed 15d 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 2026-08-30.

Code reviewai-codingclaude-codecursordeveloper-toolsmcpmcp-server
Related

Other hooks, from other repositories

SessionStart

Runs when a session starts, running memorix hook. From AVIDS2/memorix.

AVIDS2/memorix · not measured

PostToolUse

Runs after a tool call finishes for Edit and Write tool calls, executing typecheck-hook.sh via bash. From Mozurok/fhorja.dev.

Mozurok/fhorja.dev · not measured

PreToolUse

Runs before the agent uses a tool for Bash tool calls, executing rule-guard.mjs via node. From syf2211/ruledoctor.

syf2211/ruledoctor · not measured

PostToolUse

Runs after a tool call finishes, running memorix hook. From AVIDS2/memorix.

AVIDS2/memorix · not measured

Stop

Runs when the agent finishes a response, executing stop-review-gate-hook.mjs via node. From freema/cursor-plugin-cc.

freema/cursor-plugin-cc · not measured

SessionStart

Runs when a session starts, executing session-hook.mjs via node. From freema/cursor-plugin-cc.

freema/cursor-plugin-cc · not measured