I see a lot of systems converging to the idea of a single supervisor agent which coordinates with multiple "sources" e.g. search, memory. Specially across my clients and this is again the same. What I'd do different: I'd treat citations at source or output, not as a stand alone subagent. Hypothesis for why we differ: Their citation subagent is standalone and not bundled in, because Claude offers it's own citation response - not available across all providers.