Auto-generating MCP Servers from OpenAPI Schemas: Yay or Nay?
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Auto-generating MCP servers from OpenAPI specs is tempting but problematic. Key pitfalls include LLMs struggling with too many tool choices, difficulty navigating complex JSON payloads, and a fundamental mismatch between REST's resource-centric operations and MCP's workflow-oriented design. A hybrid approach is recommended: use codegen as a starting point, aggressively prune generated tools, rewrite descriptions to explain when and why to use each tool, and build higher-level tools that encapsulate multi-step workflows. Neon's own MCP server follows this philosophy, using their TypeScript SDK selectively and adding workflow-level abstractions on top.
