Tisty is a free and open source app that keeps your tasks, notes and documents as Markdown on your own computer, and gives your AI agent a memory that lasts between sessions. No accounts, no subscriptions and no telemetry. An ordinary task list forgets the moment you tick the box, and an AI agent forgets the moment the session ends. In Tisty a finished task goes to a searchable archive with its steps, dated journal and files, and documents stay one per subject, corrected in place. Its built-in MCP server lets GitHub Copilot, Claude Code, Codex or Cursor ask what changed since last time, read a long document by its outline and one section instead of the whole file, and file their work as tasks you review and close. Everything runs locally. If you want it on more than one computer, Tisty syncs through your own Google Drive, OneDrive or WebDAV server, end-to-end encrypted if you choose, or through a folder you already sync. To hand a document to someone else, Folio shares it by an encrypted, signed link. If you're looking for a private, local-first alternative to Todoist, Notion or Obsidian that also works as memory for your AI assistant, Tisty is free and open source, with no strings attached.