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Your Hook Says "Blocking Error" But the File Still Changed? PostToolUse and PreToolUse Don't Actually Block the Same Way  ·  Enabled Auto Mode and Thought You Were Safe? Permission Modes and Sandbox Boundaries Are Two Different Layers — Conflating Them Is How Things Break  ·  Messages API Adds On-Demand Compaction in Beta: Developers Decide When to Compact, Not the System  ·  Claude Cowork and Chat Officially Merge, Launching Claude Docs and Claude Slides Alongside It  ·  Why a Single "hi" Can Burn 20,000+ Tokens in Claude Code: Breaking Down the Fixed Startup Overhead  ·  How to Write Your First Custom Slash Command in Claude Code: A Working Example From Scratch

Ryan Castillo

Structure-first believer — thinks most prompt failures come from disorganized structure, not clever wording

Studies practical prompt engineering techniques, focused on how prompt structure actually differs across task types. Believes good prompts are engineered, not stumbled upon.

Articles

prompt-examples

How to Write Your First Custom Slash Command in Claude Code: A Working Example From Scratch

September 05, 2026
prompt-examples

How to Actually Use XML Tags in Prompts: 3 Before/After Examples vs. Plain Text

August 31, 2026
beginners

System Prompt vs. User Prompt: The Structural Difference That Decides Whether Claude Actually Listens

August 27, 2026
prompt-examples

Writing Your First System Prompt: From "You Are an Assistant" to a Role Setup That Actually Works

August 14, 2026