Lenny's Newsletter · Claire Vo
podcastplaybookWhat a harness is and how to build one with Claude Agent SDK
8 July 2026Product
Source excerpt
About Lenny's NewsletterListen now | 🎙️ I built a custom Claude Agent SDK harness to automate Sentry bug triage, saved the "dear agent, please fix this" prompt forever, and show you exactly how to build your own
This is a limited feed-provided excerpt, not the full original work.
Apollo layer
What a founder can learn
Founder takeaway
Turn recurring AI requests into reusable agent harnesses rather than rewriting prompts each time. Start with a narrow, repetitive workflow—such as Sentry bug triage—and encode the context and process needed to run it consistently.
Why it matters
A repeatable harness converts an ad hoc AI interaction into an operating system the team can reuse, making automation easier to adopt and less dependent on an individual remembering the right prompt.
Relevant guides
Put it to work
Identify one task where your team repeatedly gives an AI agent similar instructions. What context, steps, and expected output could you package into a reusable harness this week?