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.
Claude Code

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

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#099

Claude Code's safe mode: for when /doctor comes up empty

You run /doctor, everything's green, and you still don't know why Claude Code is acting up. There's one way to boot that answers the only question that matters: is it Claude, or is it me?

#098

Your claude -p scripts stop eating your Claude Code limits: they finally get their own credit

From June 15, your cron jobs and CI stop spending from the same limits you code with. They get their own budget, but there's one detail most people will miss.

#097

Fable 5 in Claude Code: the new model that sits above Opus

A fifth model just showed up in your `/model` picker, above Opus. What Fable 5 is, when it's worth it, and the automatic reroute that can switch your model without you asking.

#096

/sandbox in Claude Code: run commands without prompts, locked to your project

If you live in `--dangerously-skip-permissions`, there's a third path almost nobody knows: let Claude run without prompts, but unable to leave your project. No model decides it; the operating system enforces it.

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