what it does
You ask a question in plain English. xmark searches your bookmarks semantically, hands the top matches to Claude, and Claude answers using only those matches — with inline citations back to the original tweets. The citations are clickable. The answer is shaped by your bookmarks, not by the open web.
what it's good at
It's good at the kind of question where you remember that you saved something but not what it said. “What did the thread about Apple Silicon power efficiency conclude?” “The post where someone argued the opposite of consensus on remote work — find it.” “Summarize the last three things I saved about Anthropic.”
what it's not good at
It's not good at facts you didn't save. xmark won't look at the open web. If a question requires information that isn't in your bookmarks, the librarian says so. This is a feature: you're reading your own library, not a general assistant. If you want the open web, that's a different tool.
the citations are the point
Every claim cites the bookmark it came from. Click [1] and you land on the original tweet. This is the difference between “something I read once” and “something I can quote.” For writing, citations are the work. For learning, citations are the trail back to the source.