The 3 isTrusted:false Bugs That Made LinkedIn Posts Impossible From My MCP Server

TL;DR I couldn't post to LinkedIn from my MCP server. Not "sometimes fails" — never works . I assumed one bug. I was wrong. I found three, stacked, and each one looked like success to every automation tool I tried. Here is the anatomy of why your agent's "I posted it!" lies to you when a rich-text editor sits inside a dialog. The symptom I ship Safari MCP — an MCP server that drives the Safari you are already logged into. 80 tools. safari_fill is the most-used one. For three months it worked eve