agentmods.dev

PreToolUse

A pre-tool hook is an automated command that runs before an AI coding agent uses a selected tool. This one runs before Task calls, which start work by sub-agents.

In plain words
What is it for?
It is for connecting Claude Code's Task calls to the fusengine harness and injecting context when the project has a .claude/apex/ directory.
Why use it?
It can add shared APEX context to sub-agent instructions automatically, so each sub-agent receives the project guidance it needs.

Hook

25 28d ago A scan tokens not measured original MIT
View the source file fusengine/agents
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/fusengine/agents/pre-tool-use
Clone the repo
git clone --depth 1 https://github.com/fusengine/agents
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 yesterday.

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.

plugins/ai-pilot/hooks/hooks.json · 14 lines

What it actually says

{
  "PreToolUse": [
    {
      "_description": "Harness: inject APEX context into Task sub-agent prompts when .claude/apex/ exists. Resolves the harness binary from the root plugins/node_modules (single install).",
      "matcher": "Task",
      "hooks": [
        {
          "type": "command",
          "command": "bun $HOME/.claude/plugins/marketplaces/fusengine-plugins/plugins/node_modules/@fusengine/harness/dist/cli/bin.mjs hook claude-code"
        }
      ]
    }
  ]
}
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. yesterday First seen · 14 lines scan A 57d0f4c24f80

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository fusengine/agents (25 stars, last pushed 28d 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 2026-08-30.

Planningclaude-agentclaude-agentsclaude-codeclaude-code-pluginclaude-skillsclaudecode
Related

Other hooks, from other repositories

SessionStart

Runs when a session starts on startup, clear and compact, executing session-start.py via python3 (3 commands). From mindfold-ai/Trellis.

mindfold-ai/Trellis · not measured

PreToolUse

Runs before the agent uses a tool for Bash, Write and Write tool calls, running an inline shell check (3 commands). From Justdvp/claude-code-templates.

Justdvp/claude-code-templates · not measured

SessionEnd

Runs when a session ends, executing sessionend_tasks_mirror.py and sessionend_autocommit.py via python3 (2 commands). From LevNas/ccmemo.

LevNas/ccmemo · not measured

PreCompact

Runs before the context is compacted, executing precompact_checkpoint.py via python3. From LevNas/ccmemo.

LevNas/ccmemo · not measured

PostToolUse

Runs after a tool call finishes, running an inline shell check. From mbailey/voicemode.

mbailey/voicemode · not measured

UserPromptSubmit

Runs when you submit a prompt, before the agent sees it, executing enforce_quota.py via python3. From outbit/claude-code-tokenbudget.

outbit/claude-code-tokenbudget · not measured