Apparently Substack does not implement MCP, which is basically the XML-RPC of AI. According to ChatGPT they have a limited API that some independent developers have bridged to MCP. But as you would expect from a tight silo like Substack, the API lets you read but not write. They want you to use their editor, what they don’t want is to be one of 20 distributors of your writing. They want an exclusive and they get it. #