mcp-standardnotes

Give Claude secure read/write access to your Standard Notes vault — end-to-end encrypted, local stdio only, zero cloud middleman.

Ask Claude to summarize your notes, draft new ones, organize tags, search across your vault — all while your master key stays on your machine. Works with Claude Code, Claude Desktop, and any MCP-compatible client.

Disclaimer. This is an unofficial third-party integration. Not affiliated with, endorsed by, or sponsored by Standard Notes Ltd. "Standard Notes" is a trademark of Standard Notes Ltd.

Why

• 🔒 End-to-end encrypted. All decryption happens locally using audited libsodium primitives (Argon2id + XChaCha20-Poly1305 IETF). Your password never leaves RAM; your master key never leaves your machine.

• 🔌 Local stdio only. No network port is ever opened by this server.

• 🔑 OS keychain for session storage. macOS Keychain, Linux libsecret, Windows Credential Vault — never plaintext files.

• ☁️ Works with the official cloud or self-hosted Standard Notes servers.

Features

notes_create and notes_update accept an optional tags: string[] (tag UUIDs) to link tags at write time.

Requirements

• Node.js ≥ 20

• A Standard Notes account on protocol 004 (default for any account created or upgraded since 2020)

• macOS, Linux, or Windows with a working OS keychain

Quickstart

1. Install

npm install -g mcp-standardnotes

Or run from a clone if you prefer:

git clone https://github.com/lozit/mcp-standardnotes.git
cd mcp-standardnotes
npm install && npm run build

2. Log in once

mcp-standardnotes-login         # if installed globally
# or, from a clone:
npm run login

You'll be prompted for email and password. The password derives your master key in memory (Argon2id) and is never written to disk. An encrypted session is stored in your OS keychain; subsequent runs reuse it automatically.

3. Hook it up to Claude

Claude Code — add to ~/.claude.json or .mcp.json:

{
  "mcpServers": {
    "mcp-standardnotes": {
      "type": "stdio",
      "command": "mcp-standardnotes",
      "env": { "SN_EMAIL": "you@example.com" }
    }
  }
}

If you cloned instead of npm install -g, replace command with the absolute path to node and add args: ["/absolute/path/to/mcp-standardnotes/dist/index.js"].

Then /mcp to reconnect.

Claude Desktop (macOS) — edit ~/Library/Application Support/Claude/claude_desktop_config.json with the same structure, and use an absolute path to your Node ≥ 20 binary (Claude Desktop does not inherit nvm). See docs/troubleshooting.md if you hit SyntaxError: Unexpected token '??='.

Any other MCP client — run node dist/index.js with SN_EMAIL set in the environment. Transport is stdio.

Self-hosting Standard Notes? See docs/self-hosted.md for the docker-compose recipe and how to pin your TLS certificate.

Configuration

Security at a glance

• Password in RAM only during key derivation. Never logged, never stored.

• Session + master key hex → OS keychain only. Never plaintext files.

• stdio transport only. No HTTP port, ever.

• All logs go to stderr, routed through a redactor that masks passwords, keys, JWTs, and token-like strings.

• All tool inputs validated by zod.

• npm audit HIGH/CRITICAL is a merge blocker in CI.

• Only the protocol 004 framing is implemented locally; all cryptographic primitives come from libsodium-wrappers-sumo.

Full threat model and deep-dive: docs/protocol-004.md.

Troubleshooting

Common issues and fixes: docs/troubleshooting.md.

Logout

SN_EMAIL=you@example.com mcp-standardnotes-logout
# or, from a clone:
SN_EMAIL=you@example.com npm run logout

Roadmap

Upcoming work tracked in ROADMAP.md.

Contributing

Contributions welcome. See CONTRIBUTING.md for setup, tests, and PR checklist.

License

MIT — use it, fork it, ship it.

Credits

• Standard Notes for the encryption design and public API.

• Model Context Protocol and Anthropic for the MCP SDK.

• libsodium by Frank Denis, exposed via libsodium-wrappers-sumo.