Juan Andrés Núñez.

Senior Frontend Engineer specializing in Agentic AI, professional educator and speaker. Where engineering meets humanism.

Juan Andrés Núñez
Focusing on

Building FrontendLeap: teaching how to build the professional Web with GenAI and learning science.

Helping companies and teams go AI First on the Claude platform.

Claude Code

✦ New tips daily

Claude Code: from zero to professional. Tips, tutorials and deep dive guides from an engineer who uses it 12 hours a day.

Explore the tips
Claude Code Tips View all →
#185

Fable 5.1 in Claude Code: get everything out of it with three lines in your CLAUDE.md

Anthropic shipped a prompting guide for Fable 5.1 and people are already pasting it whole into CLAUDE.md. Claude Code has carried it since 2.1.257, switched on only when the model is Fable 5.1. What's left for you fits in three lines.

#184

Fable 5.1 in Claude Code: more power for 25% less

It shipped today and the note says 25% cheaper. I applied it to my three longest sessions and it lands on 45%. The per-token price hasn't moved: what dropped to a quarter is the cache read, which is exactly the line a long Claude Code session pays.

#183

Attaching files with @ in Claude Code: the hidden cost

You type @file thinking you handed over a pointer. You handed over a whole copy, and another one every time you type it again.

#182

Ctrl+S in Claude Code: git stash for your half-written prompt

You are halfway through a request and need to ask something else first. One key parks it, and you don't even have to remember to bring it back.

Gravitas

Get only what matters

If I have nothing worth saying, you won't hear from me. When I do, you'll be the first to know. 7,000+ people already trust this.

Are you a professional Web developer?
No

Unsubscribe at any time.