Web research toolkit (any topic) -- quick-searcher (sonnet) for single-fact web lookups and as sub-unit in deep team, deep-researcher (opus) lead orchestrator that classifies queries into authoritative/community/comparison/recency angles and either spawns parallel quick-searcher sub-agents (Mode A, top-level invocation) or runs the angles itself via WebSearch+WebFetch (Mode B, nested-subagent fallback) with cross-checked synthesis