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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#226

"You should know" in Claude Code: catch the calls Claude makes quietly

A built-in mod, off by default, reviews your session every 6 steps and flags the calls Claude made without mentioning them. In my test it caught a bug the tests couldn't see.

#225

Claude Code wrap-up allowance: no more half-done work at the 5-hour limit

The wrap-up allowance lets Claude Code finish the step it's on when you hit the 5-hour limit, instead of stopping with an edit half applied. Your weekly limit pays for it. How often you get it on each plan, and when it doesn't apply.

#224

"Premature close" in Claude Code: check for a missing git or gh first

"Premature close" in Claude Code usually hides a git or gh that isn't installed: up to 2.1.289 the error never said which. How to find it with one command, and when it really is the network.

#223

Haiku 5.5 in Claude Code: set autocompact to 130K and pay 71% less

Haiku 5.5 doesn't compact until about 967K, so a long session pays the high rate. At 100K it can loop; at 130K I paid 71% less.

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