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UserPromptSubmit

UserPromptSubmit is a hook for coding agents from vinta/hal-9000. Its token cost is not measured, scanned A, original, MIT.

A prompt-submission hook that runs a Python script before the coding agent sees a user's prompt. The script automatically renames the current session using code from vinta/hal-9000.

In plain words
What is it for?
Use it to trigger hal-session-auto-rename.py on each submitted prompt. It requires Python 3 and the CLAUDE_PLUGIN_ROOT environment path.
Why use it?
It can keep session names updated without requiring a manual rename. The input does not explain how the script chooses names or what other effects it has.

Hook

Part of the hal-session-auto-rename plugin — 1 hook shipped together

not rated 125 5d ago A scan tokens not measured original MIT
View the source file vinta/hal-9000
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/vinta/hal-9000/user-prompt-submit
Clone the repo
git clone --depth 1 https://github.com/vinta/hal-9000

Or install hal-session-auto-rename, the plugin that ships this one along with the rest of its 1 hook.

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 UserPromptSubmit

README.md
[![agentmods](https://agentmods.dev/badge/hooks/vinta/hal-9000/user-prompt-submit.svg)](https://agentmods.dev/hooks/vinta/hal-9000/user-prompt-submit)
Your own site
<a href="https://agentmods.dev/hooks/vinta/hal-9000/user-prompt-submit"><img src="https://agentmods.dev/badge/hooks/vinta/hal-9000/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.

plugins/hal-session-auto-rename/hooks/hooks.json · 13 lines

What it actually says

{
  "UserPromptSubmit": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "python3 ${CLAUDE_PLUGIN_ROOT}/scripts/hal-session-auto-rename.py",
          "timeout": 5
        }
      ]
    }
  ]
}
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. 3d ago First seen · 13 lines scan A bb98c079c610

Subscribe to this mod's changes

UserPromptSubmit is a hook published in the GitHub repository vinta/hal-9000 (125 stars, last pushed 5d 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.

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