What is UserPromptSubmit?

A hook that runs a shell script whenever a user submits a prompt, before the coding agent receives it. A hook is an automatic action tied to a specific event.

Use it to run the project’s user-prompt-grounding script on every submitted prompt.

It lets the project prepare or ground each request before the agent starts responding.

UserPromptSubmit — Hook for coding agents by azmym: A hook that runs a shell script whenever a…

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/azmym/gemini-plugin/user-prompt-submit

Clone the repo

git clone --depth 1 https://github.com/azmym/gemini-plugin

Or install gemini-plugin, the plugin that ships this one along with the rest of its 9 skills, 6 commands, 5 agents, 7 hooks.

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.

README.md

[![agentmods](https://agentmods.dev/badge/hooks/azmym/gemini-plugin/user-prompt-submit.svg)](https://agentmods.dev/hooks/azmym/gemini-plugin/user-prompt-submit)

Your own site

<a href="https://agentmods.dev/hooks/azmym/gemini-plugin/user-prompt-submit"><img src="https://agentmods.dev/badge/hooks/azmym/gemini-plugin/user-prompt-submit.svg" alt="Measured on agentmods" 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. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

UserPromptSubmit 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 3d 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 · 13 lines

What it actually says

{
  "UserPromptSubmit": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "${CLAUDE_PLUGIN_ROOT}/hooks/user-prompt-grounding.sh",
          "async": false
        }
      ]
    }
  ]
}

Same file

What else `hooks.json` configures

This page is one entry in a file that holds 7. 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.

3d ago First seen · 13 lines scan A 2bbb8799a5fe

Subscribe to this mod's changes

UserPromptSubmit is a hook published in the GitHub repository azmym/gemini-plugin (1 stars, last pushed 20d 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-assistant anti-hallucination claude-code claude-code-plugin developer-tools gemini

UserPromptSubmit