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LinguaMCP: Instructions file for Claude Code

CLAUDE.md

LinguaMCP CLAUDE.md is an instructions file for Claude Code from Marsmanleo/LinguaMCP. It costs 418 tokens per session, scanned A, original, Apache-2.0.

Project instructions for LinguaMCP, a server that provides structured language-learning lessons to AI tools. They describe its code layout, storage options, testing rules, and content requirements.

In plain words
What is it for?
Keeping work consistent across the server, Supabase and SQLite storage, database schemas, scripts, and language-curriculum content.
Why use it?
They give a coding agent the project’s rules and structure before it changes code, helping it avoid breaking the server or using incompatible content.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md.

This is Marsmanleo/LinguaMCP's own configuration. It tells Claude Code how to work on LinguaMCP itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything LinguaMCP configures →

not rated 1repo 3mo ago A scan 418 tokens original Apache-2.0
View source ↗ Marsmanleo/LinguaMCP
Reuse

Borrowing it

Nothing to install: this file belongs to Marsmanleo/LinguaMCP. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/Marsmanleo/LinguaMCP/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/Marsmanleo/LinguaMCP

Made for: Claude Code.

Wrote 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.

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README.md
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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.

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<a href="https://agentmods.dev/instructions/marsmanleo/linguamcp/claude-md"><img src="https://agentmods.dev/badge/instructions/marsmanleo/linguamcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 418 This file is loaded in full into every session.
When invoked 418 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00418 $0.00418
Opus 5 $0.00209 $0.00209
Sonnet 5 $0.00084 $0.00084
Haiku 4.5 $0.00042 $0.00042

Measured 9d ago against content hash f07c34e4240e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

LinguaMCP 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 9d 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.

CLAUDE.md · 45 lines

What it actually says

CLAUDE.md

Project

LinguaMCP — MCP server for daily language practice. Serves structured curriculum through the Model Context Protocol so any AI tool can become a language tutor.

Architecture

server.mjs          ← MCP entry point (JSON-RPC handler, HTTP server, tool definitions)
storage/
  interface.mjs     ← Storage contract (getNextLesson, getUserProgress, logResponse)
  supabase.mjs      ← PostgREST adapter (existing production backend)
  sqlite.mjs        ← SQLite adapter (zero-config self-hosted)
schema/
  sqlite.sql         ← SQLite table definitions
scripts/
  ingest-english-tips.ts  ← Supabase content ingestion
  init-sqlite.mjs         ← SQLite DB init + content ingestion
src/
  index.ts           ← TypeScript type definitions
supabase/migrations/ ← PostgreSQL schema migration

Rules

  • Follow existing code style (ESM, .mjs for runtime, .ts for scripts/types)
  • Test both Supabase and SQLite modes when touching storage
  • Never commit .env files or credentials
  • All curriculum content must be MIT or CC-BY compatible
  • server.mjs should remain the single entry point — no splitting into multiple servers
  • Storage adapters must implement the exact same interface and return shapes
  • No TypeScript in runtime files (server.mjs, storage/*.mjs) — keep them plain JS

MCP Tools

  • get_today_lesson — Returns next unmastered lesson for the user
  • get_user_progress — Returns mastery/practiced/remaining counts
  • log_response — Records a practice response, auto-marks mastered if score >= 4

Development

npm start          # Start MCP server (auto-detects Supabase or SQLite)
npm run dev        # Start with --watch
npm run init       # Initialize SQLite DB + ingest curriculum
npm run typecheck  # TypeScript check
Changes

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.

  1. 9d ago First seen · 45 lines · 418 tokens per session scan A f07c34e4240e

Subscribe to this mod's changes

LinguaMCP CLAUDE.md is an instructions file published in the GitHub repository Marsmanleo/LinguaMCP (1 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 418 tokens to every session, about $0.0021 per session on Opus 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.

Learning and teaching
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