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

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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#126

Claude Code plugins: the dead weight riding every message

Every active plugin weighs on your context on every message, used or not. Since v2.1.187, Claude Code tells you which ones you installed and no longer touch, so you can prune them.

#125

The Claude Code folder that keeps everything you type, in plain text

Open `~/.claude/projects/` and count: every session you've had with Claude Code is there, in plain text, unencrypted. The prompts, the responses, and the token you pasted without thinking. 30 days by default.

#124

One skill, many uses: pass it arguments in Claude Code

You write a skill, it works, and for the next near-identical case… you duplicate it. A skill can take arguments and behave differently on every call: named args, positionals, or `$ARGUMENTS`. From fixed command to template.

#123

Never let an MCP login interrupt your session again in Claude Code

An MCP login always lands mid-task: it stops you, opens the browser, makes you fight the callback. There's a command that pulls it out of the session and gets it done once. And it's the only thing that works headless.

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