Borrowing it
Nothing to install: this file belongs to lozit/mcp-standardnotes. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/lozit/mcp-standardnotes/main/CLAUDE.mdgit clone --depth 1 https://github.com/lozit/mcp-standardnotesWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/lozit/mcp-standardnotes/claude-md)<a href="https://agentmods.dev/instructions/lozit/mcp-standardnotes/claude-md"><img src="https://agentmods.dev/badge/instructions/lozit/mcp-standardnotes/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/lozit/mcp-standardnotes/claude-md"><img src="https://agentmods.dev/badge/instructions/lozit/mcp-standardnotes/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.01487 | $0.01487 |
| Opus 5.5 | $0.00595 | $0.00595 |
| Sonnet 5.5 | $0.00297 | $0.00297 |
| Haiku 4.5 | $0.00149 | $0.00149 |
Grade A, and why
mcp-standardnotes CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 111 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MCP Standard Notes
MCP (Model Context Protocol) server that lets Claude interact with a Standard Notes account (read, create, edit, delete notes and tags) while preserving Standard Notes' end-to-end encryption (E2EE).
What is implemented locally = only the Standard Notes protocol 004 framing (payload format 004:<nonce>:<ciphertext>:<aad>, root key derivation → masterKey/serverPassword, items_key wrap/unwrap). That's parsing/serialization of a documented public format, not new cryptography.
The @standardnotes/snjs package and the modular @standardnotes/{encryption,models,...} packages were ruled out: the monolith is deprecated (Node 16 only), and the modular packages have un-propagated breaking changes (ContentType removed from common) that make them unusable externally.
Stack
- Language: TypeScript (strict)
- Runtime: Node.js ≥ 20
- MCP SDK:
@modelcontextprotocol/sdk - Crypto:
libsodium-wrappers-sumo(Argon2id + XChaCha20-Poly1305 IETF) - HTTP: native
fetch(Node 20+) - MCP transport: stdio (local, no network exposure)
Commands
npm install # Install dependencies
npm run build # Compile TypeScript → dist/
npm run dev # Watch mode (tsx)
npm run typecheck # Type-check without emitting
npm test # Run tests (vitest)
npm run lint # ESLint
Structure
src/
index.ts # MCP stdio entry point
server.ts # McpServer + tool registration
cli/login.ts # `npm run login` — interactive prompt + keychain
sn/
client.ts # Orchestration: login/session → HTTP + protocol
crypto.ts # libsodium wrapper (argon2id, xchacha20poly1305)
protocol004.ts # SN 004 framing: root key, items_key wrap, payload enc/dec
http.ts # fetch wrapper: /v1/login-params, /v1/login, /v1/items/sync
session.ts # Session persistence via keytar
types.ts # Note / NoteSummary / KeyParams types
tools/notes.ts # MCP handlers + zod schemas
tools/tags.ts # Tags + sync handlers + zod schemas
security/
redact.ts, logger.ts
.env.example
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2mo ago First seen · 111 lines · 1,487 tokens per session scan A 5ed489096f03
mcp-standardnotes CLAUDE.md is an instructions file published in the GitHub repository lozit/mcp-standardnotes (12 stars, last pushed 1mo ago), licensed MIT. It adds 1,487 tokens to every session, about $0.0059 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.