What is UserPromptSubmit?

An automatic command that runs when a user submits a prompt, before the coding agent receives it.

It is for launching a Bun script that runs a delegation detector whenever a prompt is submitted.

It can check the request's delegation scope before work begins, so unsuitable or unexpected delegation can be detected early.

UserPromptSubmit — Hook by darkroomengineering

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/darkroomengineering/cc-settings/user-prompt-submit

Clone the repo

git clone --depth 1 https://github.com/darkroomengineering/cc-settings

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 2d 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 · 15 lines

What it actually says

{
  "UserPromptSubmit": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "bun \"$PLUGIN_ROOT/src/scripts/codex-hook.ts\" \"src/hooks/delegation-detector.ts\"",
          "commandWindows": "bun \"%PLUGIN_ROOT%/src/scripts/codex-hook.ts\" \"src/hooks/delegation-detector.ts\"",
          "timeout": 3,
          "statusMessage": "Checking delegation scope"
        }
      ]
    }
  ]
}

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.

2d ago First seen · 15 lines scan A 99f8ad89e1d4

Subscribe to this mod's changes

UserPromptSubmit is a hook published in the GitHub repository darkroomengineering/cc-settings (42 stars, last pushed 4d 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.

Data and AI agents ai claude-code darkroom-engineering developer-tools dotfiles

UserPromptSubmit

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

Other hooks, from other repositories

PostToolUse

PreToolUse

Notification

SessionEnd

SessionStart

StopFailure