Hjarni

A hosted note-taking system that gives Claude and ChatGPT direct access to your Markdown notes through a remote MCP server. Connect via OAuth in under two minutes with no local setup. Exposes tools for full CRUD on notes, folders, and tags, plus full-text search, wiki-style bidirectional linking, and file attachments. Each folder can have custom AI instructions that guide how the agent works with notes inside it. The dashboard tool gives agents an overview of your knowledge base structure. Works with Claude Desktop, Claude.ai, ChatGPT, and any client supporting streamable HTTP transport. Useful when you want your AI to remember things across conversations and actively manage a personal knowledge base instead of just answering one-off questions.