Episode 9 · 2026-08-28

Dig the Second Hole

A water line diagnosis and an AI agent with a wallet turn into the same lesson: test twice before you rebuild anything.

Cohost Lee Rodrigues nearly paid $4,000 to replace a water line that turned out to be brand new. The same move ends most rebuilds: run a test, run it twice, and don't let the tool define the problem.

Host Sam Rogers · cohost Lee Rodrigues, the designer who tests before he trusts · 29 min

A choice this episode can help with

What is the smallest test that could prove you are solving the wrong problem?

Run it on your own work: The Enforcement Column, one page, any model.

Run it on your own work: The Second Hole, one page, any model.

Watch it below, or read the conversation.

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About this episode

The episode runs on one move made three times. Lee digs a one-foot hole at each end of his water line and cancels a $4,000 trench: input and output validated, nothing in the middle needs fixing. Claude asks him why he is using an LMS at all when what he described was a knowledge base, and weeks of forcing the wrong tool evaporate. And Sam finds inhuman traffic in his analytics and realizes the right response is not to fix the funnel but to requestion the business. Single loop learning fixes the mistake; double loop learning fixes the question.

The connective tissue is Lee's split half troubleshooting from his Apple genius years, written originally by Steve Wozniak: simplify and reduce the variables before attempting to solve, test first, verify the physical layer. Sam ties it back to Douglas Hubbard's uncertainty-reduction method from Ep 7, the same Bayesian instinct wearing different clothes. The back half turns to agents: the Fortnite Darth Vader that two 16-year-olds prompted past its guardrails, and the cold-open rule that if you give an agent information and tell it not to share it, it will share it. Agents are not secured in and of themselves; security is a layer you put on top. If you want strong bounds, build them as architecture, not as instructions or a request.

Lee references Sam's blog post "The Question Is the Answer" twice; the episode is effectively that argument field-tested against plumbing, WordPress, and an agentic sales funnel nobody planned for. Testing stays human work throughout: don't take AI's word for what AI did.

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Transcript

Read the conversation

0:00

Lee Rodrigues: if you give an agent information and say not to share it, rest assured, it's going to share it. It's just a matter of time,

0:17

Sam Rogers: Welcome to Signals and Subtractions. I'm your host, Sam Rogers. Every week everyone brings two things to the table here. One signal worth watching, one subtraction worth making. That's the whole show. What to watch, what to drop. And this week we have our co-host Lee Rodrigues, Nice to have you back.

0:36

Lee Rodrigues: Glad to be back, Sam. Thanks for having me.

Read the full transcript

Start here

A $4,000 trench, an LMS used as a knowledge base, and agents with wallets make the same case: test the inputs and outputs before rebuilding the middle.

Topics: double loop learning · agent guardrails · problem framing · testing

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