How to Build Legal Contract Retrieval in Python (with Tenant Isolation)

For legal contract review, a staged retrieval architecture is superior to flat indexes for ensuring tenant isolation. This design utilizes explicit collections, bounded queries, and access-control metadata on every indexed item. By filtering queries by access metadata and reranking a small candidate set, the system proves a clause belongs to the requesting tenant. This approach establishes the retrieval contract as the decision boundary, preventing vector scores from widening access and optimizing index costs for B2B workspaces.