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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#138

Claude Code auto mode now protects you from yourself

You already trust auto mode to stop a `git push` to main. Over the last few weeks it learned to block three subtler, nastier things, and one is the `rm -rf` that quietly becomes a wipe of your home folder.

#137

Claude Code's security plugin doesn't know your repo's rules. Teach it.

The security plugin reviews Claude's code for generic vulnerabilities: injection, deserialization, SSRF. But it doesn't know you never log customer_id here, or that every /admin route needs a guard. You write that in yourself.

#136

Paste screenshots into Claude Code with Ctrl+V (and why some silently vanish)

You save the screenshot, drag it in, type out the path. Skip all of it: one key pastes it straight into the prompt. And if you ever tried and nothing happened, it wasn't you.

#135

Attribution in Claude Code: strip the 'Co-Authored-By: Claude' line from your commits

Claude Code signs every commit it touches, unless you tell it no twice: once for the model, once for the CLI itself.

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