Professional agentic AI, on the Claude platform.
Training for individual contributors and engineering teams.
Most people use AI assistance as a fancier autocomplete. Working with agents in production takes method: context, judgment and verification. That's what I teach.
✦ Claude Code
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My Claude Code workflow.
The skills, agents and instructions I use as a professional Software Engineer. It's called Craft, and it's a plugin you can install.
See the skillsTraining and consulting on the Claude platform.
AI First on the Claude platform
A working day with your team, online, on the Claude platform. More output without losing quality.
Agentic AI for companies
I assess how your team works and agentify the processes one or several agents can take on.
At FrontendLeap I teach you to build the professional Web with agentic AI and learning science.
FrontendLeapStop Claude Code asking for permission (without losing control)
Permission prompts in Claude Code don't go away with one setting. There are five levers (rules, modes, auto mode, the sandbox and bypass inside a container), and this guide puts them in the order that cuts the most prompts for the least risk.
Claude Code first steps: the fundamentals that don't expire
The Claude Code fundamentals that don't expire: install, sessions, context, quota, models, permissions. What you actually need to grasp on day 1.
AI: the joy of missing out on what doesn't matter
You can't keep up with AI, and you shouldn't try. The answer isn't resistance or passive acceptance: go all in, but deep on one thing instead of scattered.
Claude Code Agent View: managing parallel agents without leaving the terminal
I spent months managing many Claude Code agents by hand. Agent View now does it: my terminal-native workflow with Warp and Neovim, and the gaps I patch.
What is Claude Code: A Practitioner's Overview
What Claude Code actually is, explained by someone who uses it 12+ hours daily in production. No hype, real examples.
Claude Data (formerly Dashboards) in Claude Code: bring your CSV to life
Claude Data is the new name of Dashboards. From Claude Code it turns a CSV in your repo into a dashboard where every figure shows the calculation and the file it comes from, with no connector.
Claude Sheets from Claude Code: you won't go back to raw JSON
Claude Sheets turns a command's output into a spreadsheet with formulas and a chart, straight from Claude Code. It isn't Google Sheets: it is Claude's own sheet, filled from the terminal.
Whiteboards from Claude Code: draw your architecture with Claude
Whiteboards reaches Claude Code as one more artifact type: ask for your repo's architecture and it draws it on a board your team can edit. The Claude Code docs don't cover it yet.
Claude Code stops before finishing the task: raise Fable 5.2's effort
Claude Code starts Fable 5.2 at medium, where more turns end with the work half done. Anthropic's system prompt fix is already built in: your part is raising effort for the long stretch and replying with the exact action.
Fable 5.2 on Claude Pro: included this week, then usage credits
Fable 5.2 on the Claude Code Pro plan sits outside your limit: it runs on usage credits. This week is the exception, and it pays to know where it ends and which sessions bill without asking.
Hi, I'm Juan Andrés Núñez.
Senior Software Engineer specializing in agentic AI, professional educator and speaker. Over fifteen years building for the Web and teaching how to do it. Today I work with the Claude platform every day. Here I publish everything I learn.
The 51 essentials, as a guide.
One page per tip. Five chapters. What I actually use daily in production. No theory, no fluff.