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

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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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#201

Claude Code skills: only pay for the ones you actually use

Every skill you have installed gets described to Claude at the start of every turn. Fifty-seven of them is 7,590 tokens riding along with whatever you are actually doing.

#200

Claude-drafted feedback: Claude Code just wrote a bug report about itself, you only have to send it

Claude Code gets something wrong, you grumble, and that is where it ends. Since v2.1.238 it writes the report itself, with your own words quoted inside and the IDs of the requests that failed.

#199

prompt_cache in Claude Code: know if your cache went cold before you type

You step away for coffee, and the first message you type when you get back reprocesses the whole conversation. Your status line can warn you first, at the exact second the cache dies.

#198

--plugin-dir in Claude Code: test plugin changes before you ship them

You edit your plugin and the session keeps loading the installed version. One flag makes your local copy win for that session.

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