agentmods.dev

UserPromptSubmit

UserPromptSubmit is a hook for coding agents from Chachamaru127/claude-code-harness. Its token cost is not measured, scanned A, a copy of PreToolUse, MIT.

A command hook that runs automatically when you submit a prompt, before the coding agent receives it. It belongs to Claude Code Harness, a system that adds extra handling around Claude Code.

In plain words
What is it for?
Use it to trigger the harness memory bridge and user-prompt policy scripts for every submitted prompt.
Why use it?
It can apply the harness's prompt-handling policy consistently at submission time and skip safely if the required plugin files cannot be found.

Hook

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the claude-code-harness plugin — 25 skills, 5 commands, 5 agents, 27 hooks shipped together

One of 27 entries in hooks.json — they are configured in one file and arrive together.

not rated 3.1k +8 3d ago A scan tokens not measured copy · 92% MIT
View the source file Chachamaru127/claude-code-harness
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add Chachamaru127/claude-code-harness
Claude Code
/plugin install claude-code-harness

Or install claude-code-harness, the plugin that ships this one along with the rest of its 25 skills, 5 commands, 5 agents, 27 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/chachamaru127/claude-code-harness/user-prompt-submit.svg)](https://agentmods.dev/hooks/chachamaru127/claude-code-harness/user-prompt-submit)
Your own site
<a href="https://agentmods.dev/hooks/chachamaru127/claude-code-harness/user-prompt-submit"><img src="https://agentmods.dev/badge/hooks/chachamaru127/claude-code-harness/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 92% 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 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.

Origin

This is a copy

92% identical to PreToolUse — 43 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.

hooks/hooks.json · 34 lines

How it starts

The opening of the file, as written. The whole thing — 34 lines — stays where its author put it; the contents beside it link to each section on GitHub.

{
  "UserPromptSubmit": [
    {
      "matcher": "*",
      "hooks": [
        {
          "type": "command",
          "command": "/bin/bash -c 'valid_root(){ local r=\"${1:-}\"; [ -n \"$r\" ] && [ -x \"$r/bin/harness\" ] && [ -f \"$r/.claude-plugin/plugin.json\" ] && /usr/bin/grep -q \"\\\"name\\\"[[:space:]]*:[[:space:]]*\\\"claude-code-harness\\\"\" \"$r/.claude-plugin/plugin.json\"; }; root=\"${CLAUDE_PLUGIN_ROOT:-}\"; if ! valid_root \"$root\"; then root=\"\"; for c in \"${CLAUDE_PROJECT_DIR:-}\" \"$PWD\" \"$HOME/.claude/plugins/marketplaces/claude-code-harness-marketplace\" \"$HOME/.claude/plugins/cache/claude-code-harness-marketplace/claude-code-harness/\"*; do if valid_root \"$c\"; then root=\"$c\"; break; fi; done; fi; if ! valid_root \"$root\"; then echo \"[claude-code-harness] plugin root not found; hook skipped\" >&2; exit 0; fi; exec \"$root/bin/harness\" \"$@\"' _ hook memory-bridge",
          "timeout": 10
        },
        {
          "type": "command",
          "command": "/bin/bash -c 'valid_root(){ local r=\"${1:-}\"; [ -n \"$r\" ] && [ -f \"$r/scripts/userprompt-inject-policy.sh\" ] && [ -x \"$r/bin/harness\" ] && [ -f \"$r/.claude-plugin/plugin.json\" ] && /usr/bin/grep -q \"\\\"name\\\"[[:space:]]*:[[:space:]]*\\\"claude-code-harness\\\"\" \"$r/.claude-plugin/plugin.json\"; }; root=\"${CLAUDE_PLUGIN_ROOT:-}\"; if ! valid_root \"$root\"; then root=\"\"; for c in \"${CLAUDE_PROJECT_DIR:-}\" \"$PWD\" \"$HOME/.claude/plugins/marketplaces/claude-code-harness-marketplace\" \"$HOME/.claude/plugins/cache/claude-code-harness-marketplace/claude-code-harness/\"*; do if valid_root \"$c\"; then root=\"$c\"; break; fi; done; fi; if ! valid_root \"$root\"; then echo \"[claude-code-harness] plugin root not found; hook skipped\" >&2; exit 0; fi; exec /bin/bash \"$root/scripts/userprompt-inject-policy.sh\" \"$@\"' _",
          "timeout": 15
        },
        {
          "type": "command",
          "command": "/bin/bash -c 'valid_root(){ local r=\"${1:-}\"

Read the full file on GitHub · 34 lines

Same file

What else hooks.json configures

This page is one entry in a file that holds 27. Installing the file brings all of them; each is measured and scanned on its own page.

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 · 34 lines scan A ca209a4e34d9

Subscribe to this mod's changes

UserPromptSubmit is a hook published in the GitHub repository Chachamaru127/claude-code-harness (3,082 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. It is 92% identical to PreToolUse, differing in 43 lines, and is treated as a copy.

Data and AI
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