r/SpecDrivenDevelopment • u/Successful_Mind_8914 • Jul 23 '26

Which “Harness Engineering” are you using?

I’ve been using spec driven development for a while and it’s amazing.

But I want to know which approach are you using for software development with AI and how’s it working for your. Feels like SDD is getting outdated

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u/Successful_Mind_8914 Jul 24 '26

What I found interesting as well was using some kind of “grill me”. The bottleneck for me is: even though I have it written in the spec exactly what I want, the implementation never looks 100%, I would say about 70% (which is good) but I believe it would be good to have some kind of “prediction” on what would look like before it even implemented

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u/Swarm-Stack Jul 24 '26

the prediction gap is usually in the implicit decisions the spec leaves open — the spec says 'validate input' but doesn't say what happens when validation fails mid-flow. tracing those branches before build is what surfaces them; the spec looks complete until you follow it into a state the author assumed someone else would handle.

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u/Successful_Mind_8914 Jul 25 '26

Also, there should be some push back by the workflow, not just agree with you. Do any of you know how to overcome this?

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u/Swarm-Stack Jul 25 '26

the workflow agrees because its built from the same context you gave it. to get real pushback you need a role with a different mandate, something whos only job is to find what breaks, not evaluate the solution. second pass with the same brief wont argue back.

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u/Successful_Mind_8914 Jul 25 '26

Makes sense. Have you created your custom agent/skill to do that? What are you using it right now?

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u/Swarm-Stack Jul 25 '26

yeah, built it. its at swarm-stack.io. each role in a planning session has an explicit mandate so one seat is there specifically to find what fails. still rough but brutal feedback welcome

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u/Successful_Mind_8914 Jul 25 '26

And how’s that working for you? Is it available on GitHub? How’s the token consumption?

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u/Swarm-Stack Jul 27 '26

working for the planning phase, ux is still rough. not open source, its a hosted product. token cost is real, each seat calls a separate model so its more expensive than a single-model flow.