Building MCP Servers at Scale: Key Pitfalls Teams Face Beyond the First Deploy

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Developers often build their first MCP server quickly, but scaling to team use exposes serious challenges around access control, data validation, and secure config sharing. MCP servers rely on three core primitives — tools, resources, and prompts — and use stdio transport locally, switching to streamable HTTP for broader deployment. Experts recommend scoping credentials narrowly, since an MCP server effectively acts as a gateway to connected systems. Keeping the number of tools low is also advised, as agent performance tends to degrade beyond roughly a dozen available tools. Addressing these architectural decisions early can prevent costly delays when moving from a solo prototype to a production-ready deployment.

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