A set of checks that runs before an agent uses Bash, the command-line shell, to execute commands. It scans code, records activity for observability, and checks tool inputs for personal information.

Use it as a pre-command safety layer for Bash tool calls. It runs three Python-based checks before the command is executed.

It provides an early check for security issues, activity tracking, and accidental inclusion of personal data before shell commands run. The input does not describe what happens when a check finds a problem.

PreToolUse — Hook by alibaba

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/alibaba/anolisa/pre-tool-use

Clone the repo

git clone --depth 1 https://github.com/alibaba/anolisa

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

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 2d 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.

Origin

Copies of this mod

2 near-identical copies found in the catalogue:

UserPromptSubmit — 89% identical, 27 lines differ
PostToolUse — 89% identical, 19 lines differ

src/agent-sec-core/codex-plugin/hooks-plugin/hooks/hooks.json · 30 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "python3 ${PLUGIN_ROOT}/hooks/code_scanner_hook.py",
          "timeout": 10,
          "statusMessage": "Scanning command for security issues..."
        }
      ]
    },
    {
      "hooks": [
        {
          "type": "command",
          "command": "python3 ${PLUGIN_ROOT}/hooks/observability_hook.py",
          "timeout": 10
        },
        {
          "type": "command",
          "command": "python3 ${PLUGIN_ROOT}/hooks/pii_checker_hook.py",
          "timeout": 10,
          "statusMessage": "Checking for PII in tool input..."
        }
      ]
    }
  ]
}

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.

2d ago First seen · 30 lines scan A ddf34a08d350

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository alibaba/anolisa (614 stars, last pushed 3d 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 A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Security agent-infrastructure agent-memory agent-runtime agentic-os linux skill

PreToolUse

Getting it into your agent

Grade A, and why

Nothing flagged

Copies of this mod

What it actually says

What this file has done since we first saw it

Other hooks, from other repositories

PreToolUse

SessionStart

Stop

UserPromptSubmit

PostToolUse

PermissionRequest