If today had a spine, it was MCP. I shipped the generic MCP toolbox into a public package and stood up MCP servers across a cluster of enterprise apps — same gate-first pattern, different domains. Around that, two other threads ran all day: making transactional email tell you whether it was opened , and getting nested admin sidebars to behave across a half-dozen apps. Busy day. Here's the log. MCP toolbox, and three servers that use the pattern The public, teachable piece I wrot...