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.
/plugin marketplace add hamzaPixl/pixl-ai/plugin install pixl-crewWrote 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/hamzapixl/pixl-ai/pre-tool-use)<a href="https://agentmods.dev/hooks/hamzapixl/pixl-ai/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/hamzapixl/pixl-ai/pre-tool-use.svg" alt="Measured on agentmods" height="20"></a>Grade A, and why
PreToolUse 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 8d 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.
How it starts
The opening of the file, as written. The whole thing — 53 lines — stays where its author put it; the contents beside it link to each section on GitHub.
{
"PreToolUse": [
{
"matcher": "Bash",
"hooks": [
{
"type": "command",
"command": "bash ${CLAUDE_PLUGIN_ROOT}/hooks/scripts/run-with-flags.sh permission-check critical ${CLAUDE_PLUGIN_ROOT}/hooks/scripts/permission-check.sh",
"timeout": 5
}
]
},
{
"matcher": "Agent",
"hooks": [
{
"type": "command",
"command": "bash ${CLAUDE_PLUGIN_ROOT}/hooks/scripts/run-with-flags.sh validate-agent quality ${CLAUDE_PLUGIN_ROOT}/hooks/scripts/validate-agent-selection.sh",
"timeout": 5
}
]
},
{
"matcher": "Write|Edit",
"hooks": [
{
"type": "command",
"command": "bash ${CLAUDE_PLUGIN_ROOT}/hooks/scripts/run-with-flags.sh permission-check critical ${CLAUDE_PLUGIN_ROOT}/hooks/scripts/permission-check.sh",
"timeout": 5
},
{
"type": "command",
"command": "bash ${CLAUDE_PLUGIN_ROOT}/hooks/scripts/run-with-flags.sh tdd-check quality ${CLAUDE_PLUGIN_ROOT}/hooks/scripts/tdd-check.sh",
"timeout": 5
},
{
"type": "prompt",
"prompt": "Check the tool input below. If the file_path creates a new file inside a domain/, entities/, routes/, or infrastructure/ directory, determine whether this appears to be writing backend infrastructure from scratch. If so, block it — the pixl-crew plugin has studio/stacks/saas/ templates and skills (/saas-microservice, /ddd-pattern) that should be explored first. Tool input: $ARGUMENTS\n\nRespond with JSON: {\"ok\": true} if the file is not backend infrastructure or if exploration was already done, or {\"ok\": false, \"reason\": \"Stop — explore the plugin SaaS stack and skills before writing backend infrastructure from scratch. Use the orchestrator agent or /saas-microservice skill.\"} if blocking."
},
{
"type": "command",
"command": "bash ${CLAUDE_PLUGINWhat else hooks.json configures
This page is one entry in a file that holds 6. Installing the file brings all of them; each is measured and scanned on its own page.
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.
- 8d ago First seen · 53 lines scan A d452d0ba1ed6
PreToolUse is a hook published in the GitHub repository hamzaPixl/pixl-ai (2 stars, last pushed 4mo 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 2026-08-31.
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 on startup, executing install_pkgs.sh. From supabase/supabase.
SessionStart
Runs when a session starts, executing on-start.js via node. From google-gemini/gemini-cli.
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.
PreCompact
Runs before the context is compacted for manual and auto tool calls, executing hook-handler.cjs via node (4 commands). From ruvnet/RuView.