agentmods.dev

UserPromptSubmit

UserPromptSubmit is a hook for coding agents from exalsch/claude-session-bus. Its token cost is not measured, scanned A, original, GPL-3.0.

A prompt-submission hook that runs a Node.js program to empty a message mailbox before the agent sees your prompt.

In plain words
What is it for?
Receiving queued session-bus messages through the drain.mjs program.
Why use it?
It makes messages sent by other Claude Code sessions available at the start of prompt handling.

Hook

Part of the claude-session-bus plugin — 1 hook shipped together

not rated 0 19d ago A scan tokens not measured GPL-3.0
View the source file exalsch/claude-session-bus
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/exalsch/claude-session-bus/user-prompt-submit
Clone the repo
git clone --depth 1 https://github.com/exalsch/claude-session-bus

Or install claude-session-bus, 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/exalsch/claude-session-bus/user-prompt-submit.svg)](https://agentmods.dev/hooks/exalsch/claude-session-bus/user-prompt-submit)
Your own site
<a href="https://agentmods.dev/hooks/exalsch/claude-session-bus/user-prompt-submit"><img src="https://agentmods.dev/badge/hooks/exalsch/claude-session-bus/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 unknown 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 4d 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

The source is not reproduced here

Licensed GPL-3.0

The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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. 4d ago First seen · 13 lines scan A a3ccdf8a241a

Subscribe to this mod's changes

UserPromptSubmit is a hook published in the GitHub repository exalsch/claude-session-bus (0 stars, last pushed 19d ago), licensed GPL-3.0. 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 2026-09-01.

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