A single MCP server in front of one service is a solved problem: generate tools from the OpenAPI spec, run it over stdio or HTTP, done. At company scale the problem changes shape. A midsize platform team has forty services, each with its own spec, its own auth, its own staging and production hosts. Let every team publish an MCP endpoint and you quickly get: Agents configured against dozens of URLs, each with its own OAuth consent. Tool catalogs in the hundreds, past the limit most clients...