MCP Python SDK Extension Method Collisions: Fail Before the Server Starts
MCP Python SDK extension method collisions are configuration defects, not runtime edge cases. If two extensions claim the same method—or one claims a core MCP method—the server should reject that setup before it accepts a request. I prefer making method ownership an executable contract so registration order can never decide which handler wins. The official MCP Python SDK extension documentation defines three useful safeguards: core methods cannot be registered as extension methods, duplicate ext
