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Claude Code for Data People: Your First Session

What's next: your judgment, at scale

Look at everything your exoplanetas folder can do now, think about which number you'd sign off on, and decide what comes next with your own data.

Free course. Your Maestro, an AI, .

Open your exoplanetas folder. It was empty when the course started, and now it holds four pieces that work together:

  • planetas.csv, a 40,350-row NASA table you now know how to read: each row is a publication, and to count the 6,451 distinct planets you filter on default_flag = 1;
  • resumen.xlsx, a workbook with live formulas you traced back to their source cells, knowing what would get left out if you added rows;
  • CLAUDE.md, the instructions file every new session loads before you type your first request;
  • .claude/skills/revisa-tabla/SKILL.md, a procedure of your own that Claude Code runs before it counts or summarizes a table.

That folder already works like a workspace. Claude Code downloads the table, does the count and builds the Excel file. You bring what isn't in the columns: what a row stands for, which original file must stay untouched, when a yearly cut is incomplete, and what to check before you call a number good. That split of the work holds even as the tools change.

Think of the last important number you handed in at work. If Claude Code had calculated it, what would you have asked before signing off on it, and what rule would you pin in that folder's CLAUDE.md?

Reflect: Think of the last important number you handed in at work. If Claude Code had calculated it, what would you have asked before signing off on it, and what rule would you pin in that folder's CLAUDE.md?

Only you and your Maestro read this. It's kept on your account and deleted with it.

Write your answer

With your own data

This course used a public, well-documented table. Your work data almost never looks like that: there's no default_flag, the definition of a metric lives in someone's head, and nobody warns you when a join doubled your rows.

The course Claude Code for Data: Your Judgment, at Scale picks up from here. You work with your own tables, learn to spec a task so the agent follows your decisions, write down your quality bar, check results by a path the agent didn't take, and turn a session into a procedure you can run again. It works with Claude Code, Codex CLI or Antigravity CLI. What you showed in this course, like reading a session's trail or pinning down what a row is, already counts there: your Maestro won't ask you from scratch.

If you'd rather keep going on your own, your exoplanetas folder makes a good template: copy its structure into a folder with your own data (data your company lets you use), change the CLAUDE.md and the skill's steps, and start with /revisa-tabla. If you're not sure where to start with your data, tell your Maestro what you have.

The reading ends here; your Maestro carries on.

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