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 →
#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.

#181

Claude Code token usage: you pay for the whole conversation again on every turn

I measured three real Claude Code sessions. For every new token I gave it, it re-read between 16 and 61 tokens of history. That, not the model, is what your session costs.

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.