Lenny’s Newsletter♥ 293
Oct 29, 2024 · 15 min
Subscriber post — summary onlyLenny Rachitsky shares a guest post by prompt engineer Mike Taylor covering eight prompting techniques, from role-playing and few-shot examples to chain-of-thought, retrieval, and using an LLM as a judge. Each tactic…
Product Talk · Teresa TorresSep 16, 2026
Sep 16, 2026 · 20 min
“"That is a lot of first layer opportunities there. I wish I could click on this card and be like, 'Clean this up.'" This was a Vistaly customer reviewing her first AI-generated opportunity solution tree. Up until this point, the feedback was extremely positive. But”
Product Talk · Teresa TorresSep 2, 2026
Sep 2, 2026 · 5 min
Teresa Torres introduces a practical test harness for running AI product evals. Manually running every input through a prompt, saving outputs, scoring them against evals, and repeating for each prompt variant is…
Product Talk · Teresa TorresSep 2, 2026
Sep 2, 2026 · 26 min
Teresa Torres argues that AI evals should be a core discovery habit for product teams, not just an engineering concern. Because LLM outputs are probabilistic and semantic, traditional pass/fail unit tests don't work…
Lenny’s NewsletterSep 9, 2025
Sep 9, 2025 · 20 min
Subscriber post — summary onlyHamel Husain and Shreya Shankar outline a practical playbook for building AI evaluation systems that improve a product rather than just producing dashboards. The core argument is to start with error analysis by a domain…
@ttorres · Teresa Torres on X♥ 97
"The only way to know if our AI products and workflows are any good is with evals." 💡 If you're using AI to write PRDs, analyze customer feedback, or build customer-facing AI products, you need to understand evals. This guide breaks down what evals actually are and why product teams should be…
@ttorres · Teresa Torres on X♥ 9
💭 "I wish I could click on this card and be like, 'Clean this up.'" When a customer pointed out a flat, unstructured branch in her AI-generated opportunity solution tree, it sparked a three-week journey to fix the problem at its source. Here's what you'll learn from this article: How one customer…