Define the boundary before choosing software
The deliverable should be a structured intake packet containing the original request, source documents, extracted facts, uncertainties, and a named reviewer. An intake packet is not an engagement agreement or a legal opinion. I would make that distinction explicit in the internal interface and in any acknowledgment approved by the firm.
ABA Formal Opinion 512 discusses lawyers' obligations when using generative AI, including competence, confidentiality, communication, and supervision. Its guidance is a reason to inspect the actual data flow before putting client material into a model. It is not a certificate that a particular integration is acceptable. The firm's counsel must determine applicable jurisdictional requirements and the disclosures or consent its proposed use requires. ABA Formal Opinion 512
For an initial scope, I would choose one practice group and one intake channel. Existing clients sending new instructions, opposing counsel correspondence, unsolicited marketing, and potential new matters may require different handling. Mixing them into one generic classifier makes it harder to establish who owns each exception.