Hooks in Claude Code — Full Theory + Practical Use | CampusX
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In this video, we deeply explore Hooks in Claude Code and understand why they are essential for building safe and reliable AI coding workflows. The video explains the internal architecture of Claude Code, the concept of coding harnesses, agent loops, session lifecycle, and how hooks help enforce deterministic behaviour in probabilistic AI systems. You’ll also learn practical use cases like preventing dangerous file operations, automating workflows, and improving reliability in production-grade projects.
0:00 - Introduction
0:41 - Why Hooks Exist (Problem First Approach)
1:12 - What is Claude Code Internally?
2:00 - Claude Code as an Agentic Coding System
4:22 - Understanding Coding Harness (Core Concept)
7:00 - LLM Limitations & Why Harnesses Matter
8:31 - What a Coding Harness Actually Does
11:24 - How Coding Harness & LLM Work Together
13:31 - Harness Engineering & Emerging Ecosystem
15:31 - Core Problem: Probabilistic LLM + Deterministic Harness
17:48 - Risks in Real Projects (File Deletion, Unsafe Actions)
19:10 - Why Instructions in claude.md Are Not Enough
20:53 - Agent Loop Explained (How Claude Executes Tasks)
24:48 - Session Lifecycle Explained
27:27 - Events Inside Claude Code Lifecycle
30:05 - What are Hooks? (Core Definition)
31:01 - Practical Example: Preventing Dangerous Operations
33:35 - How Hooks Make AI Systems Deterministic
34:37 - Common Use Cases of Hooks (Formatting, Safety, Automation)
36:01 - Hooks for Auto Formatting & Code Consistency
37:53 - Linting Hooks (Bug Detection & Code Quality)
39:29 - Security Hooks (Blocking Dangerous Commands & Protecting Files)
40:13 - Notification Hooks (Task Completion Alerts)
41:13 - Telemetry Hooks (Monitoring Subagents & Events)
42:13 - Personal Workflow Automation with Hooks
43:11 - Internal Working of Hooks (Events, Matchers, Actions)
45:31 - Building a File Protection Hook (Practical Example)
46:49 - Complete Hook Execution Flow Explained
49:09 - Live Demo: Preventing Database Deletion
52:11 - Creating Real Hooks (Formatter + Sensitive File Protection)
54:29 - Integrating Hooks into Real Project Workflow
55:31 - Building “Edit Expense” Feature with Claude Code
57:01 - Testing & Verifying the Feature
58:27 - MCP + GitHub Workflow Integration
59:07 - Fixing GitHub Token Permissions
1:00:07 - Creating “Ship Feature” Custom Command