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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#203

Prompt hooks in Claude Code: when the rule needs judgment, not an exit code

Some rules a script cannot check, because they are not a condition, they are a judgment call. A prompt hook puts a fast model in charge of that decision, on the event you pick.

#202

How to quit Claude Code: the difference between leaving and stopping

Ctrl+C does not close Claude Code, it interrupts it. And the command that does close it only detaches you when the session runs in the background.

#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.

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