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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#112

How to stop or redirect Claude Code mid-task without losing its work

Claude's about to edit the wrong file and your instinct is to hit Esc. Sometimes that's the wrong move: stopping cold and steering on the fly are two different keys, and which one you pick decides whether you lose the work in progress.

#111

MCP "Failed to connect" in Claude Code: the decision tree that ends the panic

When an MCP server goes red with "Failed to connect", it's almost never your config. A decision tree to tell in thirty seconds whether it's auth, a wrong URL, or a local process that died.

#110

/team-onboarding in Claude Code: your setup turned into a guide (even with no team)

You see it, think "that's for teams", and scroll past. Mistake: /team-onboarding scans your last 30 days and writes a guide to your own setup. For a new teammate, or for your future self on another machine.

#109

/fork in Claude Code: delegate a background task without re-explaining your context

If you learned /fork a few months ago, your mental model is wrong. It changed in v2.1.161 and now does something very different from /branch. Here's the difference that trips up almost everyone.

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