using the @beehiiv MCP is an absolute cheat code for anyone with a newsletter 🤯 I had Claude analyze the subject line and performance of every newsletter I've ever sent. the output: what works: • cultural references / pop culture callbacks (+4–6 pts) • place names and personal moments (+3–4 pts) • internal/company framing (+3–5 pts) • abstract nouns implying motion (+2–4 pts) • conversational/casual (+2–3 pts) what doesn't: • "beehiiv" in the subject (−4–5 pts) • how-to / playbook framing…