agentmods.dev

PreToolUse

A set of pre-tool checks that runs a shell script before the coding agent writes files, edits files, changes notebooks, or runs commands.

In plain words
What is it for?
It helps validate bibliography writes and protect files whose names begin with a specified ledger prefix.
Why use it?
It catches invalid bibliography changes and blocks edits to protected ledger files when the checks succeed.

Hook

Part of the phillit plugin — 3 skills, 4 agents, 4 hooks shipped together

41 3d ago A scan tokens not measured original Apache-2.0
View the source file AI-4-Phi/PhilLit
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/ai-4-phi/phillit/pre-tool-use
Clone the repo
git clone --depth 1 https://github.com/AI-4-Phi/PhilLit

Or install phillit, the plugin that ships this one along with the rest of its 3 skills, 4 agents, 4 hooks.

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 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.

hooks/hooks.json · 67 lines

How it starts

The opening of the file, as written. The whole thing — 67 lines — stays where its author put it; the contents beside it link to each section on GitHub.

{
  "PreToolUse": [
    {
      "matcher": "Write",
      "hooks": [
        {
          "type": "command",
          "command": "bash \"${CLAUDE_PLUGIN_ROOT}/hooks/fast_gate.sh\" .bib hooks/validate_bib_write.py || echo '{\"systemMessage\": \"PhilLit: .bib write-time validation could not run (uv failure) - the write was allowed unvalidated.\"}'"
        }
      ]
    },
    {
      "matcher": "Write",
      "hooks": [
        {
          "type": "command",
          "command": "bash \"${CLAUDE_PLUGIN_ROOT}/hooks/fast_gate.sh\" _ledger- hooks/block_ledger_write.py || echo '{\"systemMessage\": \"PhilLit: ledger write-protection gate could not run (uv failure) - the write was allowed.\"}'"
        }
      ]
    },
    {
      "matcher": "Edit",
      "hooks": [
        {
          "type": "command",
          "command": "bash \"${CLAUDE_PLUGIN_ROOT}/hooks/fast_gate.sh\" _ledger- hooks/block_ledger_write.py || echo '{\"systemMessage\": \"PhilLit: ledger write-protection gate could not run (uv failure) - the edit was allowed.\"}'"
        }
      ]
    },
    {
      "matcher": "NotebookEdit",
      "hooks": [
        {
          "type": "command",
          "command": "bash \"${CLAUDE_PLUGIN_ROOT}/hooks/fast_gate.sh\" _ledger- hooks/block_ledger_write.py || echo '{\"systemMessage\": \"PhilLit: ledger write-protection gate could not run (uv failure) - the edit was allowed.\"}'"
        }
      ]
    },
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "bash \"${CLAUDE_PLUGIN_ROOT}/hooks/fast_gate.sh\" run_in_background hooks/block_background_bash.py || echo '{\"systemMessage\": \"PhilLit: background-bash gate could not run (uv failure) - the call was allowed.\"}'"
        }
      ]
    },
    {
      "matcher": "Agent",
      "hooks": [
        {
          "type": "command",
          "command": "bash \"${CLAUDE_PLUGIN_ROOT}/hooks/fast_gate.sh\" run_in_background hooks/block_subagent_background_dispatch.py || ech

Read the full file on GitHub · 67 lines

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.

  1. 3d ago First seen · 67 lines scan A 26d674b5133a

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository AI-4-Phi/PhilLit (41 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.

literature-review-toolphilosophy
Related

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PostToolUse

Runs after a tool call finishes for Write and Edit tool calls, executing format_and_lint.sh. From supabase/supabase.

supabase/supabase · not measured

SessionStart

Runs when a session starts, executing on-start.js via node. From google-gemini/gemini-cli.

google-gemini/gemini-cli · not measured

SessionStart

Runs when a session starts on startup, executing install_pkgs.sh. From supabase/supabase.

supabase/supabase · not measured

PreToolUse

Runs before the agent uses a tool for Bash tool calls, running an inline shell check. From apache/superset.

apache/superset · not measured

PreToolUse

Runs before the agent uses a tool, executing pre-write.sh and pre-bash.sh (2 commands). From anthropics/claude-cookbooks.

anthropics/claude-cookbooks · not measured

SessionStart

Runs when a session starts, executing session-start.sh. From anthropics/claude-cookbooks.

anthropics/claude-cookbooks · not measured