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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#165

/usage in Claude Code: which skill and which MCP are eating your limit

You run out of quota and the model takes the blame. Claude Code now names the culprit, and it is usually a tool you installed yourself.

#164

Claude Code auto-compact: who decides your context window (and why it should not be you)

Four places can set your auto-compact window, and the environment variable beats the other three without saying a word. Claude Code knows which one won, but it only tells you if you ask.

#163

Claude Code subagents: the tools they silently lose in the background

Your subagent declares `tools` in its frontmatter and still doesn't have them. Not a bug: in the background, which is the default, Claude Code strips everything outside a short list, and it reports no error.

#162

Claude Code in Slack: hand the bug off from the thread that reported it

@Claude in the bug thread and Claude Code opens a web session without leaving Slack. It uses the full thread as context, so only do this in conversations you trust.

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