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

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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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#150

New line in Claude Code: why Shift+Enter submits your prompt, and the key that always works

You press Shift+Enter for a new line and Claude Code submits half your prompt. It is not your fault and it is not a bug, and one key never fails.

#149

Claude Code effort: not the level you think you have

You can spend months running at an effort level you never picked. Five places define it, four of them fail without saying a word, and your settings.json is one of them.

#148

Claude Code thinking: you don't control it anymore, but you pay for it all the same

Thinking stopped being your switch: the model now decides on every step whether to reason at all. You're left with three knobs and, depending on the model you run, one or two of them do nothing at all.

#147

Sonnet 5, Opus 5 and Fable 5: which one I reach for, and what changing your mind costs

You have three frontier models in the picker and the official guidance tells you which is for what. What nobody mentions is the price of changing your mind mid-session, which is the decision you actually make several times a day.

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