agentmods.dev

UserPromptSubmit

A prompt-submission hook that runs a Python script before the agent receives the user's message. It uses the project's user_prompt_submit.py file.

In plain words
What is it for?
Use it to run prompt preprocessing or other setup automatically at the start of each user request.
Why use it?
It creates a consistent place to process or prepare incoming prompts before the agent handles them. The description does not specify what the script actually does.

Hook for Claude Code

5 5d ago A scan tokens not measured copy · 89% MIT
View the source file markmhendrickson/ateles
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/markmhendrickson/ateles/user-prompt-submit
Clone the repo
git clone --depth 1 https://github.com/markmhendrickson/ateles

Made for: Claude Code.

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 89% copy Near-identical to another mod 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.

Origin

This is a copy

89% identical to UserPromptSubmit — 6 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.claude/settings.json · 12 lines

What it actually says

{
  "UserPromptSubmit": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "python3 \"$CLAUDE_PROJECT_DIR/.claude/hooks/user_prompt_submit.py\""
        }
      ]
    }
  ]
}
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. 2d ago First seen · 12 lines scan A ca08b9d6a8c4

Subscribe to this mod's changes

UserPromptSubmit is a hook published in the GitHub repository markmhendrickson/ateles (5 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. It is 89% identical to UserPromptSubmit, differing in 6 lines, and is treated as a copy.

Autonomous AgentsLLMaauthagent-swarmai-agentsclaude
Related

Other hooks, from other repositories

SessionEnd

Runs when a session ends, executing claude-session-end.ps1. From orwa-mahmoud/nightshift.

orwa-mahmoud/nightshift · not measured

Stop

Runs when the agent finishes a response, executing stop_hook.py via python. From simonasrazm/simon-factory-lights-out.

simonasrazm/simon-factory-lights-out · not measured

SessionStart

Runs when a session starts, executing ocean-announce.sh via bash. From rajkaria/boil-the-ocean.

rajkaria/boil-the-ocean · not measured

SubagentStop

Runs when a subagent finishes, executing collector-hook.js via node. From core0-io/nio.

core0-io/nio · not measured

PostToolUse

Runs after a tool call finishes for Write and Edit tool calls, executing format_and_lint.sh. From supabase/supabase.

supabase/supabase · not measured

SessionStart

Runs when a session starts, executing on-start.js via node. From google-gemini/gemini-cli.

google-gemini/gemini-cli · not measured