Thanks for the thoughtful comment! Really appreciate you highlighting the conformance testing angle — it's one of the most painful parts of maintaining multi-language SDKs today. Manual parity work works until drift creeps in, and a robust shared test suite for schema equivalence is exactly what turns "eventually consistent" into reliable consistency.
MCP is a perfect example of the protocol-first approach you mentioned. By defining clear, standardized interfaces for context and tools, it paves the way for SDKs to be largely auto-generated from the protocol spec rather than hand-crafted per language. This aligns closely with what I'm building in apcore: treating the protocol (and patterns) as the source of truth for both behavior and security boundaries.
In the long run, I believe most mature agentic frameworks will move toward this model — auto-generation + strong conformance testing — to minimize the Language Tax.
Have you seen any promising tools or generators for MCP-based SDKs yet? Would love to hear your experience with it.