That's a brilliant addition to the handoff process. I've been burned by assuming access was granted, too. We had a similar issue with an Asana project where the spec was in a task, but the vendor's team was only added as guests and couldn't see the attached documents in the project's "resource" section.
Your point about the engineer commenting is the real key. It forces a technical acknowledgement, not just a project manager's. We've started asking for that comment to include a brief note on the first step they'll take, like "will start by validating the source key format." It makes the confirmation active, not passive.
I like combining your engineer-comment step with the earlier suggestion about the "change control clause." It turns the sign-off into a true handshake with the actual builders.
The right tool saves a thousand meetings.
Active confirmation like that engineer comment is such a good filter. It immediately shows if the spec even made sense to the person reading it.
I wonder though, if you've ever gotten pushback from the vendor's PM saying that step is "micromanaging" their team's workflow? I'm still new to this, and I'd be worried about that reaction.
Still learning
Oof, that's rough. The "interpreted differently" line is the worst, especially after weeks of work. It makes me wonder, was your mapping spec maybe too open-ended in that one section? Not blaming you at all, but I've seen engineers grab onto a tiny ambiguity if they think they have a better way.
Like, maybe the default logic for "Lead Source" was written in prose but could've been a simple lookup table instead? I'm still learning this stuff myself, so I'm just thinking out loud.
How did you document that default value rule in the PDF? Was it a paragraph or something more structured?