flashcard-mcp

An MCP server that gives Claude (or any MCP client) the ability to create, review, and manage flashcards with spaced repetition (FSRS algorithm).

Organize cards into projects, tag them by topic, and let the scheduling algorithm figure out when you need to see each card again.

100% vibecoded.

Blog post

Read about how I use this MCP to learn math: Flashcards MCP

Related MCP server: acornonaut-mcp

Installation

The server URL is:

https://flashcards.louisarge.com/api/mcp

It works out of the box — just add it as a remote MCP server in your client and sign in with Google when prompted.

Video tutorials

• Installing in Claude

• Installing in ChatGPT

Tools

• create_project / list_projects — organize cards into projects

• read_memory / write_memory / edit_memory — persistent per-project notes and context

• create_flashcard / edit_flashcard / list_flashcards / delete_flashcard — manage cards

• get_due_flashcards — get cards that are due for review

• review_flashcard — record how well you remembered (1-4), updates the schedule

• get_flashcard_answer — reveal the answer after quizzing yourself

Self-hosting

The api/mcp.ts endpoint runs as a Vercel serverless function, backed by Upstash Redis.

Requires Node.js 20 or newer.

Connect an Upstash Redis database via Vercel's Storage integration — it'll set up KV_REST_API_URL and KV_REST_API_TOKEN automatically.

Firebase setup

Authentication uses Firebase Google Sign-In. You'll need a Firebase project with Google auth enabled.

Server environment variables (set in Vercel):

• FIREBASE_PROJECT_ID — Firebase project ID

• FIREBASE_CLIENT_EMAIL — Firebase service account email

• FIREBASE_PRIVATE_KEY — Firebase service account private key, PEM format

Client-side Firebase config lives in api/authorize.ts — update the firebase.initializeApp({...}) block with your own Firebase project credentials.