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The Prompting Playbook: Debug a Production Prompt

An interactive walkthrough of "The Prompting Playbook", a public breakout talk at the Code with Claude conference by Margot van Laar, Applied AI Engineer at Anthropic in London. Follow her live debugging of a messy customer-support prompt for a fictional telco: why a prompt that worked breaks on a new model, how to build an eval suite of control, edge and capability-boundary cases, how to strip pasted-website cruft and an untrue persona, how XML tags separate role from policy from tone, and how an output contract plus a stop sequence pin down the response — then isolate a single failing case and find the conflicting instruction behind it. Source: Margot van Laar, "The Prompting Playbook", Code with Claude.

6 lessons