How do you stop LLMs from just summarizing? Extracting hidden requirements from vague briefs

Hey everyone!

I've been wrestling with a specific problem while building Brief Synthesis: Most LLM implementations just summarize what's already in the project brief.

But the real value is extracting what's NOT written:

- Hidden technical constraints the client forgot to mention

- Operational context that's implied but not stated

- Risks buried between the lines

What I tried:

1. Basic prompting → Just rephrased the brief (useless)

2. Few-shot examples → Better, but still surface-level

3. Chain-of-thought + specific extraction framework → Finally started getting operational insights

The challenge I'm still facing:

How do you prevent the model from hallucinating requirements that don't exist while still reading between the lines? I'm walking a tightrope between "too literal" and "making things up."

To the engineers here: Have you faced this? What patterns worked for extracting implicit requirements without crossing into hallucination?

Would love to hear your war stories and what architectural patterns you've used for this.