Rotom MCP

The Project

The problem

LLMs are great at talking about Pokémon cards, but they hallucinate prices, sets and legality. The upstream Pokémon TCG API is also tight: 1,000 requests a day, 30 a minute per IP, and frequent 500 errors.

What it does

Rotom MCP exposes the API to the model as real tools, so it looks things up instead of guessing:

• search_cards: search cards by name, set and other filters
• get_card: full card details by ID
• list_sets / get_set: sets, optionally filtered by series
• get_card_prices: TCGPlayer and Cardmarket prices
• get_card_legality: Standard, Expanded and Unlimited legality
• list_types, list_subtypes, list_supertypes, list_rarities: reference data

How it’s built

• Go, shipped as a single binary with no runtime dependencies.
• MCP over stdio, plug-and-play with Claude Desktop and Claude Code.
• Every tool call goes through one shared in-memory cache with a 10-minute TTL. A repeat query is a ~40 ns lookup instead of a ~150–650 ms network round trip.

Try it

"mcpServers": {
  "pokemon-tcg-rotom-mcp": {
    "command": "/path/to/pokemon-tcg-rotom-mcp"
  }
}