Agent Host Retrieval Tier Pattern The long-tail keyword for this article is agent host retrieval tier pattern . It describes a useful architecture for AI agents: keep retrieval as a clear tool boundary between the host and external sources. AutoSearch implements this pattern with open-source, MCP-native deep research across 40 channels, including 10+ Chinese sources, while the host remains responsible for model choice and task flow. The retrieval tier should not be hidden inside a prompt. It should be something the agent can call, inspect, and verify. Pattern overview An agent host usually manages conversation, files, planning, permissions, and model calls. A retrieval tier manages source access. Separating those responsibilities prevents a single model prompt from becoming the place where every integration and behavior is buried. AutoSearch fits as that retrieval tier. It can return source material from web, developer, academic, social, video, and Chinese channels.…