# LostInNotes

> LostInNotes is an AI-native note-taking app: capture notes as text, voice or images and
> search them by meaning (semantic vector search), not just keywords. It also exposes a
> remote Model Context Protocol (MCP) server so external AI assistants can save notes to a
> user's account and search them — turning LostInNotes into a shared "second brain" for
> any MCP-capable client.

## Model Context Protocol (MCP)

LostInNotes provides a remote MCP server over streamable HTTP. Any MCP client (claude.ai
and ChatGPT connectors, Claude Code, Claude Desktop, Cursor, Gemini CLI, the Claude API MCP
connector, …) can connect.

- Endpoint: https://lostinnotes.com/mcp/
- Transport: streamable HTTP
- Auth (either):
  - OAuth 2.1 with PKCE and Dynamic Client Registration. Discovery starts from the 401
    challenge (`resource_metadata`) or https://lostinnotes.com/.well-known/oauth-protected-resource/mcp;
    authorization server metadata at https://lostinnotes.com/.well-known/oauth-authorization-server.
    The user signs in and picks the scope (read-only or read+write, all notebooks or an
    allowlist). This is how claude.ai / ChatGPT custom connectors connect — no token to paste.
  - Personal Access Token sent as `Authorization: Bearer <token>`, generated in the app
    under "Integration / MCP".
  MCP access is a Premium feature.
- Tools: create_note, search_notes (snippets), get_note (full note as Markdown),
  update_note, append_to_note, list_notebooks, create_notebook, rename_notebook,
  delete_notebook. Notes can carry images (returned as short-lived signed URLs) and belong
  to notebooks. Destructive actions are limited: no note deletion, and only empty notebooks
  can be deleted.
- claude.ai / ChatGPT: add a custom connector with the endpoint URL and sign in.
- Claude Code setup: `claude mcp add --transport http lostinnotes https://lostinnotes.com/mcp/`
  (then authenticate via `/mcp`), or with a token:
  `claude mcp add --transport http lostinnotes https://lostinnotes.com/mcp/ --header "Authorization: Bearer <token>"`
- Once connected, the server advertises its own usage instructions and tool schemas via
  the MCP `initialize` and `tools/list` calls — no external API docs are required.

## Docs

- Guide (how it works, incl. the MCP integration): https://lostinnotes.com/en/guide/
- Privacy policy: https://lostinnotes.com/privacy-policy/
- Terms of service: https://lostinnotes.com/terms-of-service/

## Product

- Home: https://lostinnotes.com/