Sierra MCP Gateway Dev Diary

I wrote a post for the Sierra blog about building our internal "MCP Gateway". An early draft was was formatted as a development diary; we ended up abandoning that approach due to its length and lack of "catchiness". But I thought it would be fun to preserve for posterity, so I'm archiving it here. Context is the lifeblood of internal agents - even the best model in the most full-featured harness…