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Use when creating, modifying, or debugging Claude Code hooks — PreToolUse, PostToolUse, Stop, SubagentStop, SessionStart, SessionEnd, UserPromptSubmit, PreCompact, Notification. Covers the plugin `hooks/hooks.json` wrapper format vs. the user `settings.json` direct format, matchers, security patterns, `$CLAUDE_PLUGIN_ROOT` portability, lifecycle limitations, and debugging. Trigger on "add a hook", "validate tool use", "block dangerous commands", "enforce completion", "hook-based automation".
Passed 23 of 24 test cases with the skill, and 11 of 24 without it.
and 19 more in the full report
13 fixed10 passed either way0 still failing1 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 13 test cases the skill fixed. Same model, same prompt, with and without the skill.
What error class is thrown by `resolvePluginRoot()` when all resolution fallbacks fail, and what property on that error instance contains the list of paths that were checked?
| Checked | Without skill | With skill |
|---|---|---|
| Identifies PluginRootResolutionError as thrown error class | Missed | Passed |
| Identifies triedPaths property listing attempted resolution paths | Missed | Passed |
The instructions your model reads when the skill loads.
Adapted from claude-plugins-official/plugin-dev/skills/hook-development. Trimmed to what we actually author (our plugin already has 6 event matchers covering 7 hook handlers — see hooks/hooks.json).
{
"type": "prompt",
"prompt": "Evaluate if this tool use is appropriate: $TOOL_INPUT",
"timeout": 30
}
Supported events: Stop, SubagentStop, UserPromptSubmit, PreToolUse.
Use for: context-aware decisions, flexible evaluation, natural-language reasoning.
{
"type": "command",
"command": "${CLAUDE_PLUGIN_ROOT}/hooks/validate.mjs",
"timeout": 60
}
Use for: fast deterministic validations, file-system ops, external tools, performance-critical paths.
Our convention: all our command hooks are .mjs (Node.js) — see hooks/pre-bash-destructive-guard.mjs, hooks/enforce-scope.mjs. The v3.0 migration moved us off bash for native Windows support.
This is where people trip up. Two formats exist; they are NOT interchangeable.
hooks/hooks.json — wrapper formattest cases passed, vs 11 / 24 without
Published skills whose descriptions closely match this one, with their headline benchmark lift.
More skills from the same source and nearby in the registry, with their headline benchmark lift.