Flesh and Blood Card Database MCP Server

Breaking Change (MCP 2026-07-28): This server has migrated to the MCP 2026-07-28 protocol revision. Legacy SSE endpoints (/sse, /sse/message) have been removed and will return 404. Existing clients must change their connection URL from `/sse` to `/mcp`. The initialize handshake and session management have been removed from the protocol; the server is now fully stateless. Clients using older MCP protocol versions will not be able to connect.

A Model Context Protocol (MCP 2026-07-28) server for searching and retrieving information about Flesh and Blood Trading Card Game (FAB TCG) cards. This server is deployed on Cloudflare Workers as a stateless Streamable HTTP service and provides tools for card search, print variation lookup, card detail retrieval, and product catalog browsing.

CardVault API Migration Status

The official FAB card database has moved to cardvault.fabtcg.com and uses a new API host (api.cardvault.fabtcg.com).

• Analysis date: 2026-03-07
• Investigation + migration design: docs/cardvault-api-analysis.md
• Implementation status: search_fab_cards / get_fab_card_prints / get_card_detail / get_fab_products now use CardVault API (api.cardvault.fabtcg.com)

Features

This MCP server provides the following tools. All tools return structured output via structuredContent (in addition to the content text fallback), conforming to their declared outputSchema.

1. Search FaB Cards (search_fab_cards)

Search for Flesh and Blood cards by name. Returns a structured array of matching cards, including:

• Card ID and name
• Card images
• Card attributes (pitch, cost, power, defense)
• Card text and type information
• Links to the official card page

2. Get FaB Card Prints (get_fab_card_prints)

Retrieve all print variations of a specific card using its card ID. Returns a structured array of prints, including:

• Print ID and associated card ID
• Print name and display name
• Print images (small, normal, large sizes)
• Layout information
• Finish types available

3. Get Card Detail (get_card_detail)

Get detailed information about a specific card, including non-English text. Returns a structured object containing:

• Complete card data in English and Japanese (when available)
• Card attributes (pitch, power, defense, cost)
• Publication details (set, rarity, artist)
• All available card variations

4. Get FaB Products (get_fab_products)

Retrieve product groups from cardvault.fabtcg.com/products. Returns a structured object containing:

• Product group name and type
• Release dates
• Nested product entries (slug, language, printed date)
• Pagination metadata (next, previous, nextPage, previousPage)

Deployment

This project is designed to be deployed on Cloudflare Workers.

Prerequisites

• Node.js and npm installed
• Cloudflare account
• Wrangler CLI installed (npm install -g wrangler)

Deployment Steps

1. Clone this repository:

   git clone <repository-url>
   cd fab-card-db-mcp

1. Install dependencies:

   yarn install

1. Authenticate with Cloudflare:

   wrangler login

1. Deploy to Cloudflare Workers:

   wrangler deploy

The server will be deployed to the domain configured in wrangler.jsonc (currently fab-card-db-mcp.discord.jp).

Using the MCP Server

Endpoints

The server exposes the following endpoints:

• POST /mcp - Streamable HTTP MCP endpoint (MCP 2026-07-28)
• GET /.well-known/mcp.json - MCP server discovery manifest

Security

This server intentionally allows all origins (Access-Control-Allow-Origin: *) and performs no Origin validation. This is by design: the server is authless and exposes only public card data, so cross-origin requests carry no credential or data-confidentiality risk.

Example Usage

When connected to an MCP client, you can use the provided tools as follows:

#### Card Search Example

// Using the search_fab_cards tool
const searchResults = await use_mcp_tool({
  server_name: "Flesh and Blood Card Search API",
  tool_name: "search_fab_cards",
  arguments: {
    query: "Awakening"
  }
});

// Results will contain card information matching the search query

#### Print Variations Example

// Using the get_fab_card_prints tool
const printVariations = await use_mcp_tool({
  server_name: "Flesh and Blood Card Search API",
  tool_name: "get_fab_card_prints",
  arguments: {
    cardId: "CARD_ID_HERE" // Replace with an actual card ID from search results
  }
});

// Results will contain all print variations for the specified card

Connecting with MCP Clients

This server uses the MCP 2026-07-28 Streamable HTTP transport. Clients that support this protocol revision can connect to:

• Streamable HTTP endpoint: https://fab-card-db-mcp.discord.jp/mcp
• Discovery manifest: https://fab-card-db-mcp.discord.jp/.well-known/mcp.json

MCP 2026-07-28 compliant clients can discover the server automatically via the .well-known/mcp.json manifest, which advertises the /mcp endpoint.

Migration required: Legacy SSE-based connections (/sse) are no longer supported and will return 404. If you were previously connecting to https://fab-card-db-mcp.discord.jp/sse, change your connection URL to https://fab-card-db-mcp.discord.jp/mcp. Your client must also support the MCP 2026-07-28 Streamable HTTP transport.

License

See the LICENSE file for details.