agentmods.dev

PreToolUse

A set of automatic checks that run before an agent writes files, edits code, or runs shell commands. The checks enforce project rules such as using a separate worktree, avoiding raw HTML elements, and including tests, documentation, scaffolding, and runtime support with source changes.

In plain words
What is it for?
Use it to guard agent actions in a software repository. It is for enforcing editing, testing, documentation, scaffolding, and compatibility requirements before changes happen.
Why use it?
It catches common workflow and code-quality mistakes before they are made. This reduces changes that break project conventions or are difficult to review and maintain.

Hook for Claude Code

109 10d ago A scan tokens not measured original MIT
View the source file webjsdev/webjs
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/webjsdev/webjs/pre-tool-use
Clone the repo
git clone --depth 1 https://github.com/webjsdev/webjs

Made for: Claude Code.

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.

.claude/settings.json · 56 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Write|Edit|MultiEdit|NotebookEdit",
      "hooks": [
        {
          "type": "command",
          "command": ".claude/hooks/require-worktree-for-edits.sh"
        }
      ]
    },
    {
      "matcher": "Write|Edit|MultiEdit",
      "hooks": [
        {
          "type": "command",
          "command": ".claude/hooks/block-raw-htmlelement.sh"
        }
      ]
    },
    {
      "matcher": "Write|Edit|MultiEdit|NotebookEdit|Bash",
      "hooks": [
        {
          "type": "command",
          "command": ".claude/hooks/block-prose-punctuation.sh"
        }
      ]
    },
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": ".claude/hooks/require-tests-with-src.sh"
        },
        {
          "type": "command",
          "command": ".claude/hooks/require-docs-with-src.sh"
        },
        {
          "type": "command",
          "command": ".claude/hooks/require-scaffold-with-src.sh"
        },
        {
          "type": "command",
          "command": ".claude/hooks/require-bun-parity-with-runtime-src.sh"
        },
        {
          "type": "command",
          "command": ".claude/hooks/block-install-in-linked-worktree.sh"
        }
      ]
    }
  ]
}
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 · 56 lines scan A 0ee864a54655

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository webjsdev/webjs (109 stars, last pushed 10d 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.

Git and workflowTestingWriting and docsbunfullstack-frameworkjavascript-frameworkno-buildnodejsprogressive-enhancement
Related

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PostToolUse

Runs after a tool call finishes for Write, Edit and MultiEdit tool calls, executing post-edit-format.js. From oven-sh/bun.

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UserPromptSubmit

Runs when you submit a prompt, before the agent sees it, running an inline shell check. From coleam00/Archon.

coleam00/Archon · not measured

UserPromptSubmit

Runs when you submit a prompt, before the agent sees it, executing hook-bootstrap.mjs via node. From ashlrai/ashlr-plugin.

ashlrai/ashlr-plugin · not measured

SessionStart

Runs when a session starts, running clens-hook SessionStart. From silouone/clens.

silouone/clens · not measured

PreToolUse

Runs before the agent uses a tool, running clens-hook PreToolUse. From silouone/clens.

silouone/clens · not measured