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Why do MCP servers remain stateless in the recommended architecture pattern?

In the common MCP architecture pattern, the MCP server acts purely as a stateless provider of tools, resources, and prompt templates, while the MCP client hosts the actual LLM runtime and agent logic that decides what to call and when.

  • A stateless server can be reused and replaced without worrying about losing session-specific state
  • Keeps the decision-making logic centralized in the client, which simplifies reasoning about what the agent is actually doing
  • Makes the server simpler to scale, since any instance can serve any request without needing shared session context

This isn't a hard requirement of the protocol itself, some architectures do run LLM logic on the server side for centralized control, but the stateless-server pattern is the simpler, more common default when strong dynamic orchestration isn't a priority.

What does a stateless MCP server make easier?
Where does the decision-making logic typically live in this pattern?

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