///// Blog
Research and guides
What we find checking MCP servers and sites from the outside, and how to fix it.
Guide · 2026-11-04 · 2 min read
The MCP sign-in chain, step by step
What ChatGPT, Claude, Cursor, Codex and Gemini CLI do before a user sees your login page, and the five places it can break.
Research · 2026-11-03 · 3 min read
1 in 9 MCP servers that use sign-in break before a login page
We checked 1,000 servers from the official MCP Registry. Of those that use sign-in, 11% fail before a user ever sees a login page, most often at the first step.