Under the Claude objective Configure Claude Projects with instructions and knowledge sources, preventing context bleed and data crossover between distinct clients is a critical privacy, security, and project governance requirement. Projects in Claude serve as isolated contextual containers designed to compartmentalize project- specific knowledge files, custom system instructions, and chat histories.
Option A correctly implements strict boundary isolation by creating dedicated, independent Projects for each client engagement. By giving each Project its own discrete knowledge base and unique system prompt, reference material and conversational state from one client remain entirely inaccessible to the other. In contrast, combining client documentation into a single shared Project (Option B) or sharing memory configurations across workstreams (Option C) directly causes cross-tenant contamination and context bleed.
Similarly, using unstructured general chats without Project containers (Option D) lacks scoped memory and persistence boundaries, significantly elevating operational and confidentiality risks.