Persistent Session Memory for Claude Without Prompt Injection ?

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I am using MCP with Claude, and every time I send a request, the MCP needs to call the schema definition(sql table) to generate the necessary context. Is there any way to store the schema definition in memory across sessions, so that it can be accessed without re-fetching it every time — and without relying on prompt injection? This would help optimize performance and reduce the need to repeatedly call the schema definition.