Describe the Data Shape

Where you'll practice this

2 Promptles scenarios teach this principle directly. Each one drops you into a real engineering ticket and asks you to write the prompt you'd send to Claude Code.

• The Email Parser

  You receive order confirmation emails from a vendor in a consistent format. The email body looks like: 'Order #ORD-12345 confirmed. Amount: $1,234.56. Date: March 15, 2025.' You want a Python script called `parse_emails.py` that reads a text file `emails.txt` (one email body per…

• The CSV Cleaner

  You have a 10,000-row CSV file called `contacts.csv` exported from Salesforce. The data has problems: some rows have empty `email` fields, there are duplicate rows (same email appearing multiple times), and phone numbers are in mixed formats: some use dashes (555-123-4567), some…

Other principles in Context

• Declare the Tools You Need

  Name the tool or MCP server by name, and say what to do if it isn't reachable.

• Describe Before You Prescribe

• Explain the Integration Point

• Keep Memory Reusable

  Save patterns and preferences that survive across sessions; never save snapshots of finished work.

• Map to Real Components

  Use Code Connect so it reuses your components, not new markup.

• Name the Framework