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.

Explore the hub
Claude Code Tips View all →
#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.

#122

Claude Code in JetBrains: IntelliJ and PyCharm without switching to VS Code

Code in IntelliJ or PyCharm and think Claude Code's nice integration is a VS Code thing? There's an official plugin that lights up your JetBrains IDE: diffs in the viewer, shared selection, and file references. And no, it's not JetBrains' AI Assistant.

Gravitas

Get only what matters

If I have nothing worth saying, you won't hear from me. When I do, you'll be the first to know. 7,000+ people already trust this.

Are you a professional Web developer?
No

Unsubscribe at any time.