HOOK_MECHANISMS

Technical deep dive into how the UserPromptSubmit and PreToolUse hooks work.

Skills
Productivity
0

What it does and how to use it

A skill that teaches Claude Code to do productivity tasks well. It is packaged knowledge the model uses whenever it is relevant.

Install the skill (command above).
In Claude Code, describe what you need - the skill turns on by itself when the context fits.
No commands to memorize: you talk in plain language and the skill does the rest.

Install (Claude Code)

mkdir -p .claude/skills/hook-mechanisms && curl -fsSL https://doutorai.pt/data/lib/skills__hook-mechanisms.md -o .claude/skills/hook-mechanisms/SKILL.md

Paste this command into the terminal, in your project folder, and the component installs automatically.

Content

# Hook Mechanisms - Deep Dive

Technical deep dive into how the UserPromptSubmit and PreToolUse hooks work.

## Table of Contents

- [UserPromptSubmit Hook Flow](#userpromptsubmit-hook-flow)
- [PreToolUse Hook Flow](#pretooluse-hook-flow)
- [Exit Code Behavior (CRITICAL)](#exit-code-behavior-critical)
- [Session State Management](#session-state-management)
- [Performance Considerations](#performance-considerations)

---

## UserPromptSubmit Hook Flow

### Execution Sequence

```
User submits prompt
    ↓
.claude/settings.json registers hook
    ↓
skill-activation-prompt.sh executes
    ↓
npx t

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