Anthropic just acquired developer tool startup @StainlessAPI, whose biggest customers were OpenAI and Google. Back in October, I had Stainless CEO and founder Alex Rattray (@RattrayAlex) on AI & I to talk about MCP servers and the unglamorous plumbing that makes AI agents actually work. (Disclosure: I’m a small investor in the company.) After Monday's news, the conversation lands differently—in it, Alex essentially walks me through the design thinking for building APIs, SDKs, and MCP servers…