Loose prompts feel fast because the typing is short, but the real clock starts after generation, when you discover the model guessed wrong on something you never bothered to specify.
Why it matters: The minutes you save skipping a detailed prompt come back as hours of rework, so the fastest developers now write more upfront, not less.
The Details:
Underspecified prompts don't stall a model, they trigger silent guessing. Naming conventions, error handling, edge cases, and the definition of "done" all get filled in with plausible defaults that may not match what's in your head. The mismatch doesn't surface immediately; it shows up three rounds later as a rewrite of the whole approach.
The cost curves are fundamentally different. Writing a spec is linear: thirty minutes in produces thirty minutes of output. Debugging a misaligned generation is exponential: read, run, find the flaw, re-prompt, regenerate, repeat, and the wasted cycles compound instead of adding up.
A tight spec isn't about length, it's about naming the load-bearing decisions before generation starts. "Add retry logic" leaves backoff strategy, retryable errors, and idempotency all open to interpretation. Specifying exact retry counts, backoff timing, and which requests are off-limits collapses the task to one clean pass instead of a guessing game.
The skill this rewards isn't typing speed, it's the ability to state invariants: what must always hold, what must never happen, what's explicitly out of scope. That third category gets skipped most often, yet it's usually what prevents a model from quietly expanding the problem to fill in gaps nobody defined.
Bottom Line: The constraint isn't overhead on the work; it is the work, and skipping it just moves the thinking to a more expensive place later.
Watching for the phrase "close, but" repeating on the same task is the clearest sign that spec debt is piling up. When it happens, the fix is to stop regenerating, write the three constraints in plain text, and start clean rather than patch a wrongly shaped result.
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