UserPromptSubmit

UserPromptSubmit is a hook for Claude Code from martineserios/thebrana. Its token cost is not measured, scanned A, original, MIT.

A set of automatic commands that run when you submit a prompt, before the agent processes it. They prepare model settings, add context, capture signals, and refresh presence information.

In plain words
What is it for?
Use it to perform pre-request checks and context injection, capture information from submitted prompts, and refresh the agent's presence state.
Why use it?
It makes sure each request starts with the available setup and project context. It also records signals and updates presence before work begins.

Hook for Claude Code

Written for Claude Code: UserPromptSubmit hook event.

Part of the brana plugin — 56 skills, 4 commands, 14 agents, 13 hooks shipped together

One of 13 entries in hooks.json upstream. Installing this one merges just its entry into your config; the other 12 are separate, each on its own page.

Good fit Use it to perform pre-request checks and context injection, capture information from submitted prompts, and refresh the agent's presence state.

Compare 6 hooks from other repositories ↓
Install with agentmods
npx agentmods add hooks/martineserios/thebrana/user-prompt-submit
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/martineserios/thebrana

Made for: Claude Code.

Or install brana, the plugin that ships this one along with the rest of its 56 skills, 4 commands, 14 agents, 13 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.

agentmods badge for UserPromptSubmit

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

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 7d 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.

system/hooks/hooks.json · 44 lines

What it actually says

{
  "UserPromptSubmit": [
    {
      "matcher": "",
      "hooks": [
        {
          "type": "command",
          "timeout": 3000,
          "command": "bash \"$HOME/.claude/hooks/preflight-model.sh\""
        }
      ]
    },
    {
      "matcher": "",
      "hooks": [
        {
          "type": "command",
          "timeout": 5000,
          "command": "bash \"$HOME/.claude/hooks/context-inject.sh\""
        }
      ]
    },
    {
      "matcher": "",
      "hooks": [
        {
          "type": "command",
          "timeout": 3000,
          "command": "bash \"$HOME/.claude/hooks/signal-capture.sh\""
        }
      ]
    },
    {
      "matcher": "",
      "hooks": [
        {
          "type": "command",
          "timeout": 3000,
          "command": "bash \"$HOME/.claude/hooks/presence-refresh.sh\""
        }
      ]
    }
  ]
}
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. 7d ago First seen · 44 lines scan A 7d7fb4f5dbd3

Subscribe to this mod's changes

UserPromptSubmit is a hook published in the GitHub repository martineserios/thebrana (3 stars, last pushed 3d 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.