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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#102

Conditional rules in Claude Code: stop loading your whole CLAUDE.md every session

Your CLAUDE.md grows and loads whole every session, no matter how much of each part you use. There's a folder that makes each rule show up only when it matters.

#101

/model in Claude Code: why your model sticks or resets when you didn't mean to

You picked a model once and now every session starts on it. Or the opposite: you change it and it reverts on its own. A silent v2.1.153 change explains both.

#100

MCP in Claude Code: connect 20 servers without eating your context

The "don't connect more than five MCPs" rule existed for a reason that's no longer true. Claude Code quietly changed the context math, and almost nobody noticed.

#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?

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