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.
git clone --depth 1 https://github.com/iii-experimental/agentosWrote 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/iii-experimental/agentos/pre-tool-use)<a href="https://agentmods.dev/hooks/iii-experimental/agentos/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/iii-experimental/agentos/pre-tool-use/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/hooks/iii-experimental/agentos/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/iii-experimental/agentos/pre-tool-use.svg" alt="Reviewed on agentmods" width="80" height="20"></a>Grade B, and why
PreToolUse scanned grade B with 2 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 1mo 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.
Sends data to an external URLmediumData exfiltration
A POST to an outside endpoint may be telemetry or may be exfiltration; either way the mod talks to somewhere, and you should know where.
"command": "curl -s -X POST http://localhost:3111/api/memory/store -H 'Content-Type: application/json' -d '{\"agentId\":\"claude-code\",\"content\":\"File modified: $TOOL_INPUT_file_path\",\"role\":\"system\"}'", Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
"command": "curl -s -X POST http://localhost:3111/api/memory/store -H 'Content-Type: application/json' -d '{\"agentId\":\"claude-code\",\"content\":\"File modified: $TOOL_INPUT_file_path\",\"role\":\"system\"}'", What it actually says
{
"PreToolUse": [
{
"matcher": "^(Write|Edit)$",
"description": "Track file changes for agent memory",
"hooks": [
{
"type": "command",
"command": "curl -s -X POST http://localhost:3111/api/memory/store -H 'Content-Type: application/json' -d '{\"agentId\":\"claude-code\",\"content\":\"File modified: $TOOL_INPUT_file_path\",\"role\":\"system\"}'",
"timeout": 3000,
"continueOnError": true
}
]
}
]
}What else hooks.json configures
This page is one entry in a file that holds 2. 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.
- 1mo ago First seen · 16 lines scan B 0c22e137b5be
PreToolUse is a hook published in the GitHub repository iii-experimental/agentos (162 stars, last pushed 5mo ago), licensed Apache-2.0. Its token cost is not measured: a hook is shell that never enters the context. A static security scan graded it B with 2 findings (sends data to an external url, makes network calls). 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, executing install_pkgs.sh. From supabase/supabase.
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.
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.
PostToolUse
Runs after a tool call finishes for Bash tool calls, executing hooks.sh via sh (3 commands). From anthropics/claude-plugins-official.