UserPromptSubmit

UserPromptSubmit is a hook for coding agents from jagoff/memo. Its token cost is not measured, scanned A, original, MIT.

Hooks that save session information, capture idle-session notes, create checkpoints, and run related memory commands when a prompt is submitted.

In plain words
What is it for?
Autosaving a session, capturing durable notes after idle time, creating a checkpoint, and running the configured prompt-submit checks.
Why use it?
They preserve context across work sessions and allow background maintenance, while the input does not fully list every configured command.

Hook

Part of the memo plugin — 4 skills, 1 command, 4 hooks, 1 MCP server shipped together

One of 4 entries in hooks.json — they are configured in one file and arrive together.

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/jagoff/memo/user-prompt-submit
Clone the repo
git clone --depth 1 https://github.com/jagoff/memo

Or install memo, the plugin that ships this one along with the rest of its 4 skills, 1 command, 4 hooks, 1 MCP server.

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/jagoff/memo/user-prompt-submit.svg)](https://agentmods.dev/hooks/jagoff/memo/user-prompt-submit)
Your own site
<a href="https://agentmods.dev/hooks/jagoff/memo/user-prompt-submit"><img src="https://agentmods.dev/badge/hooks/jagoff/memo/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 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 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 · 34 lines

What it actually says

{
  "UserPromptSubmit": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "MEMO_NONINTERACTIVE=1 memo session autosave",
          "timeout": 5,
          "comment": "Increased from 3s: DB writes can be slow on first call"
        },
        {
          "type": "command",
          "command": "MEMO_NONINTERACTIVE=1 MEMO_AGENT_TTY=${MEMO_AGENT_TTY:-$(tty 2>/dev/null | grep -E '^/dev/' | head -1)} memo session idle-maintenance --mode capture",
          "timeout": 30,
          "async": true,
          "comment": "Idle capture: waits for a quiet window (MEMO_SESSION_IDLE_CAPTURE_SECS, default 10s) after the turn finishes and then mines the current session chunk into durable memorias. MEMO_AGENT_TTY captures the terminal PTY so the notification writes directly to the user's terminal. Stale workers self-cancel if a newer prompt updated the session snapshot. Async + soft-fail. Disable with MEMO_CAPTURE_DISABLE=1."
        },
        {
          "type": "command",
          "command": "MEMO_NONINTERACTIVE=1 memo session checkpoint",
          "timeout": 5,
          "async": true
        },
        {
          "type": "command",
          "command": "MEMO_NONINTERACTIVE=1 memo sync auto",
          "timeout": 90,
          "async": true,
          "comment": "Durable in-session GitHub sync: self-throttled (MEMO_SYNC_PUSH_DEBOUNCE_S / MEMO_SYNC_PULL_INTERVAL_S) so a crashed/long session doesn't strand hours of memorias until Stop, and a long session converges on another Mac's pushes without a restart. Cheap no-op (timestamp check, no git) when not due; soft no-ops on non-git installs. Async so it never touches the recall 5s budget. Disable with MEMO_SYNC_AUTO=0."
        }
      ]
    }
  ]
}
Same file

What else hooks.json configures

This page is one entry in a file that holds 4. 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 9f6a5469d286

Subscribe to this mod's changes

UserPromptSubmit is a hook published in the GitHub repository jagoff/memo (16 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.