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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#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.

#222

Claude Haiku 5.5 in Claude Code: 90% cheaper subagents

Claude Haiku 5.5 is Claude Code's new Haiku: 90% cheaper than Haiku 4.5 and far ahead on benchmarks. The full discount only holds under 100K tokens, though, and your session starts at half that.

#221

Claude Code mods: draw your own UI inside Claude Code

A mod is JavaScript or TypeScript that runs inside Claude Code: it draws a line above the prompt or a pane, and can hold a tool call. Claude writes one from a single sentence.

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