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.
npx agentmods add hooks/janbjorge/rekal/user-prompt-submitgit clone --depth 1 https://github.com/janbjorge/rekalGrade 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 yesterday.
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.
What it actually says
{
"UserPromptSubmit": [
{
"hooks": [
{
"type": "command",
"command": "uvx --from rekal==3.4.0 rekal hook user-prompt-submit"
}
]
}
]
}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.
- yesterday First seen · 12 lines scan A 4f89820c8f42
UserPromptSubmit is a hook published in the GitHub repository janbjorge/rekal (53 stars, last pushed 6d 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.
Other hooks, from other repositories
SessionStart
Runs when a session starts on startup, resume and compact, executing ensure_deps.sh and on_session_start.sh (2 commands). From mem0ai/mem0.
PreToolUse
Runs before the agent uses a tool for Skill, Read, Write, Edit, MultiEdit and NotebookEdit tool calls, running an inline shell check (2 commands). From tigerless-labs/autoharness.
UserPromptSubmit
Runs when you submit a prompt, before the agent sees it, executing pane-title.sh and workspace-status.sh via bash (2 commands). From virgil-king/kbtz.
UserPromptSubmit
Runs when you submit a prompt, before the agent sees it, running an inline shell check. From aikts/yandex-tracker-mcp.
Stop
Runs when the agent finishes a response, executing dashboard-stop.js via node. From JubaKitiashvili/context-mem.
PostToolUse
Runs after a tool call finishes, executing taskbar-hero-update.js via node. From leonardosilvamelosantos/taskbar-code.