Drawing the install so the trade can actually build it
The situation
A large share of field rework is not skill, it is communication: the person who holds the intent describes it in words, and the person who installs it builds a different thing. Diagramming intent used to mean CAD time nobody had for a temporary condition. Generating a clear sketch from a written constraint list is now minutes, which makes it worth doing for exactly the throwaway conditions that were never drawn before.
Steps
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Write the constraints as plain sentences, in sequence
Plain text, before any tool
Not a drawing request — a numbered list of conditions. How much is live at once, what moves and when, what must stay clear of what, and why. The reasons matter: they let the diagram put things in defensible places.
What you only learn by doing it: Costello’s list included why the power source stays well below the work: so water from dust control cannot reach the source panels. State the reason and the layout follows; omit it and you get a tidy diagram that fails on site.
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Ask for a diagram, not a rendering
OpenAI for Education Napkin AI
Specify a labelled schematic: components named, relationships shown, text legible. An attractive perspective view of a jobsite is useless to an installer; a plain labelled sketch is what gets built from.
What you only learn by doing it: Ask for every component to carry a text label. Unlabelled generated diagrams look convincing and tell an installer nothing he did not already know.
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Hand it to the person who has to install it, and watch them read it
The actual subcontractor or crew lead
Do not explain it. Give it to the installer and let them narrate what they think it says. The gap between their reading and your intent is the only measure of whether the diagram worked.
What you only learn by doing it: Resist narrating. The moment you explain the diagram you are testing your explanation again, which is the thing that already failed.
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Fix the diagram, not the explanation
Back to the generator with the correction
Where they misread it, change the drawing. Each round makes the artifact carry more of the load, which is the whole point: the drawing has to work when you are not standing there.
What you only learn by doing it: Two or three rounds is normal. If you are past four, the condition is more complex than a generated sketch can carry and it needs a real drawing.
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Keep it as the template for the next trade
Your project folder
The constraint list and the working diagram become the pattern for the next scope and the next project. The value compounds across trades, not within one.
What you only learn by doing it: Costello’s own next step was versions for plumbing and other scopes. The reusable thing is the constraint-list-then-diagram habit, not the picture.
Where this breaks down
A generated diagram is not an engineered drawing. It is not stamped, it carries no code review, and it must never be used where a sealed drawing is required. It communicates intent to the person installing. Label it as such on the sheet itself so it cannot be mistaken later for something it is not.
Generated images routinely get details subtly wrong — a connection reversed, a clearance that does not exist, a component drawn where it will not fit. The person who knows the trade has to read it before it reaches a crew, and that review is step three for a reason.
Clearances, ratings and separations are governed by code and by the authority having jurisdiction. Nothing here substitutes for either. Where a diagram and the code disagree, the code governs and the diagram is wrong.
If the condition is life-safety — temporary power distribution, shoring, fall protection, egress — the diagram is a conversation aid for a licensed professional, and nothing more.
Provenance: adapted from James Costello, interviewed in OpenAI’s ChatGPT for Pros newsletter, 5 August 2026, who generated a temporary-power diagram for a 32-floor top-down demolition after his electrician could not follow the verbal description: “This diagram shows exactly what I wanted him to install, and he now understands.” He uses the same method to build four-step visual work plans for demolition-robot operators. The sequence, the checkpoints and the cautions below are our construction, written for a classroom. Treat the source as one practitioner’s documented experience in a vendor publication, not as evidence that this works generally.