BeforeTool

BeforeTool is a hook for Claude Code from King-A23/agent-reflectmem. Its token cost is not measured, scanned A, original, MIT.

A hook that runs before Gemini CLI uses its shell-command tool. It starts the ReflectMem hook script with Node.js.

In plain words
What is it for?
Use it to connect ReflectMem to Gemini CLI's shell-command events.
Why use it?
It lets ReflectMem perform its configured work before shell commands run.

Hook for Claude Code

Written for Claude Code: a Claude Code hooks.json. Also seen: mentions Gemini CLI.

One of 4 entries in hooks.json upstream. Installing this one merges just its entry into your config; the other 3 are separate, each on its own page.

Good fit Use it to connect ReflectMem to Gemini CLI's shell-command events.

Compare 6 hooks from other repositories ↓
Install with agentmods
npx agentmods add hooks/king-a23/agent-reflectmem/before-tool
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.

Clone the repo
git clone --depth 1 https://github.com/King-A23/agent-reflectmem

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for BeforeTool

README.md
[![agentmods](https://agentmods.dev/badge/hooks/king-a23/agent-reflectmem/before-tool/github.svg)](https://agentmods.dev/hooks/king-a23/agent-reflectmem/before-tool)
Your own site
<a href="https://agentmods.dev/hooks/king-a23/agent-reflectmem/before-tool"><img src="https://agentmods.dev/badge/hooks/king-a23/agent-reflectmem/before-tool/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for BeforeTool

Your own site · 80×15
<a href="https://agentmods.dev/hooks/king-a23/agent-reflectmem/before-tool"><img src="https://agentmods.dev/badge/hooks/king-a23/agent-reflectmem/before-tool.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
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. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Security

Grade A, and why

BeforeTool 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 2mo 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

Copies of this mod

1 near-identical copy found in the catalogue:

  • AfterTool — 92% identical, 4 lines differ
hooks/hooks.json · 13 lines

What it actually says

{
  "BeforeTool": [
    {
      "matcher": "run_shell_command",
      "hooks": [
        {
          "type": "command",
          "command": "node ${extensionPath}/plugins/agent-reflectmem/hooks/reflectmem_hook.js gemini-cli BeforeTool"
        }
      ]
    }
  ]
}
Same file

What else hooks.json configures

This page is one entry in a file that holds 4. Installing the file brings all of them; each is measured and scanned on its own page.

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. 2mo ago First seen · 13 lines scan A 369f64a80a57

Subscribe to this mod's changes

BeforeTool is a hook published in the GitHub repository King-A23/agent-reflectmem (1 stars, last pushed 5mo 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.

Related

BeforeTool compared with hooks from other repositories

BeforeTool next to 6 hooks from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
BeforeToolKing-A23/agent-reflectmemHook15mo agoMITA—Claude Code
BeforeToolkenryu42/gemini-safety-netHook31mo agoMITA—Claude Code
Stopkage-core/KageHook412mo agoGPL-3.0A—Claude Code
SubagentStopkage-core/KageHook412mo agoGPL-3.0A—Claude Code
SessionStartjuliangeymonat-jpg/wikimothHook84mo agoApache-2.0A—Claude Code
AfterAgentrichardcb/oh-my-geminiHook187mo agoMITA—Claude Code
BeforeToolrichardcb/oh-my-geminiHook187mo agoMITA—Claude Code