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/steve-magne/hookstack/user-prompt-expansiongit clone --depth 1 https://github.com/steve-magne/hookstackWrote 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.
[](https://agentmods.dev/hooks/steve-magne/hookstack/user-prompt-expansion)<a href="https://agentmods.dev/hooks/steve-magne/hookstack/user-prompt-expansion"><img src="https://agentmods.dev/badge/hooks/steve-magne/hookstack/user-prompt-expansion.svg" alt="Measured on agentmods" height="20"></a>Grade A, and why
UserPromptExpansion 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 3d 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.
This is a copy
56% identical to SessionStart — 7 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.
What it actually says
{
"UserPromptExpansion": [
{
"hooks": [
{
"type": "command",
"command": "node $CLAUDE_PROJECT_DIR/.claude/hooks/user-prompt-expansion-skill-context.mjs"
}
]
}
]
}What else settings.json configures
This page is one entry in a file that holds 26. Installing the file brings all of them; each is measured and scanned on its own page.
- Settings file hookstack A not measured
- Hook ConfigChange A not measured
- Hook CwdChanged A not measured
- Hook FileChanged A not measured
- Hook InstructionsLoaded A not measured
- Hook MessageDisplay A not measured
- Hook Notification A not measured
- Hook PermissionDenied A not measured
- Hook PermissionRequest A not measured
- Hook PostCompact A not measured
- Hook PostToolBatch A not measured
- Hook PostToolUse A not measured
- Hook PostToolUseFailure A not measured
- Hook PreCompact A not measured
- Hook PreToolUse A not measured
- Hook SessionEnd A not measured
- Hook SessionStart A not measured
- Hook Stop A not measured
- Hook StopFailure A not measured
- Hook SubagentStart A not measured
- Hook SubagentStop A not measured
- Hook TaskCompleted A not measured
- Hook TaskCreated A not measured
- Hook UserPromptSubmit A not measured
- Hook WorktreeRemove A not measured
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.
- 3d ago First seen · 12 lines scan A 88630f092111
UserPromptExpansion is a hook published in the GitHub repository steve-magne/hookstack (7 stars, last pushed 9d 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 56% identical to SessionStart, differing in 7 lines, and is treated as a copy.
Other hooks, from other repositories
PostToolUse
Runs after a tool call finishes for Write and Edit tool calls, executing format_and_lint.sh. From supabase/supabase.
SessionStart
Runs when a session starts, executing on-start.js via node. From google-gemini/gemini-cli.
SessionStart
Runs when a session starts on startup, executing install_pkgs.sh. From supabase/supabase.
PreToolUse
Runs before the agent uses a tool for Bash tool calls, running an inline shell check. From apache/superset.
PreToolUse
Runs before the agent uses a tool, executing pre-write.sh and pre-bash.sh (2 commands). From anthropics/claude-cookbooks.
SessionStart
Runs when a session starts, executing session-start.sh. From anthropics/claude-cookbooks.